光学透明胶在触摸屏中的应用研究进展

王明洋¹，李铭昊¹，姜柏安¹，许祎晨¹，王  洪²，赵  彪¹

（1.北京化工大学材料科学与工程学院，北京  100029；2.北京迪文科技有限公司，北京  100089）

【摘  要】近年来，触摸屏作为一种最简单的人机交互方式，正在快速取代传统的电子显示屏。光学透明胶（OCA）是一种无色透明、具有高透光率和高粘接力的光学压敏胶，被广泛应用于触摸屏各层屏体间的贴合。OCA能有效提升触控屏的光学效果、触控灵敏性和机械可靠性，减少屏幕眩光，给使用者更好的视觉体验。本文系统地介绍了OCA的特点、分类、固化方式、粘接机理以及技术进展，探讨了目前OCA材料存在的问题，并对其未来发展前景进行了展望。

【关键词】光学透明胶；分类；固化方式；粘接机理；研究进展

生物基高分子改性沥青研究进展

田培军¹，阚士云²，张增平²，钱建行³，杨  洋¹，夏静杰¹，刘  浩²

（1.宁波东兴沥青制品有限公司，浙江宁波  315000；2.长安大学教育部特殊地区公路工程重点实验室，陕西西安  710064；3.长安大学都柏林国际交通学院，陕西西安  710018）

【摘  要】随着我国道路桥梁建设的蓬勃发展，改性沥青逐渐占领应用市场，在沥青中掺加环氧树脂、聚氨酯、酚醛树脂等高分子可获得高性能的改性沥青或沥青混合料。为了减少对不可再生资源的消耗，以便于道路工程的可持续发展，生物基原料逐渐替代石油基原料。本文针对树脂类（生物基聚氨酯、生物基酚醛树脂）改性沥青、生物基橡胶改性沥青、生物基天然弹性体改性沥青、生物基复合型改性沥青等原料和研究进展进行了梳理和汇总，并对生物基改性剂（植物油、植物酚、木质素、松香和衣康酸等）最新研究成果进行分享。提出了生物基高分子改性沥青目前存在的问题，最后对其未来发展进行了展望。

【关键词】改性沥青；生物基高分子；改性机理

车体涂装用PVC焊缝密封胶的研究及应用进展

于  虎，杨士勇，孟  惠，卢  卓，段晨洁

(济南汉斯曼时代技术有限公司，山东济南  250031)

【摘  要】汽车行业的发展对车身密封提出了更高的要求，PVC焊缝密封胶作为涂装最重要的用胶种类之一，其研究受到越来越多的关注。本文整理了近些年国内对于PVC焊缝密封胶的配方研究、施工工艺研究的公开报道以及行业研究进展，主要包括PVC焊缝密封胶的力学性能、施工性能、环保性能、施工工艺以及特殊车体要求等方面，最后进行了总结与展望。

【关键词】PVC焊缝密封胶；车身密封；施工工艺；涂装

纤维素基环氧树脂及其木材胶粘剂粘接性能研究

张彤彤¹，王    芳¹，周    孜²，朱新宝^1,2

（1.南京林业大学化学工程学院，江苏  南京    210037；2.安徽新远科技股份有限公司，安徽黄山    245900）

【摘    要】以碱活化的纤维素为原料，通过与环氧乙烷（EO）发生接枝液化反应，合成了液体纤维素基环氧树脂（PHECEP）。然后以E-51为基体树脂，胺类T31为固化剂，硅微粉以及硅烷偶联剂KH-560和PHECEP为改性剂，制备纤维素基环氧树脂胶粘剂，并对其进行力学性能、热性能和耐化学性等测试。研究结果表明：在PHECEP掺入量为20%时，抗冲击强度从2.9 kJ/m²提升到50.9 kJ/m²；当PHECEP掺入量为5%时，室温下固化7 d的纤维素基胶粘剂拉伸剪切强度比纯E-51提高了171.1%。掺入PHECEP后，实际拉伸剪切强度高于测试中的强度，并且在小分子溶剂中耐受性更优良。通过PHECEP/E-51材料的力学性能、干湿粘接强度、热稳定性和耐化学性等性能的综合评判，得到相对最优的木材胶粘剂配方为：5%PHECEP（相对于E-51质量而言），1%的KH-560、60%的硅微粉和18%的T31固化剂（分别相对于PHECEP和E-51总质量而言）。

【关键词】纤维素；纤维素基环氧树脂；双酚A型环氧树脂；木材胶粘剂；粘接性能

基于复合弹性体界面粘接强度计算的有限元数值模型构建

杨   敏，许永伦，王淑婷，庞云嵩，任琳琳，曾小亮，孙    蓉

（深圳先进电子材料国际创新研究院，广东 深圳    518100）

【摘    要】基于硅凝胶复合弹性体，构建有限元数值计算模型用于计算其界面粘接强度。该模型包括内聚力和具有Mullins效应的超弹体材料力学模型，分别描述了复合弹性体在剥离时界面处能量损耗和周围材料形变时的能量损耗。使用Abaqus可直接实施算例，其算例所需相关计算参数可通过相应的材料力学表征得到。由于与试验结果即其数据曲线的变化趋势、幅度与区间等相近，证明所构建有限元数值模型具有一定的准确性。这一研究为通过有限元数值计算来预测材料性能提供了新的思路，以取代复杂的试验表征方法。

【关键词】复合弹性体；界面粘接强度；有限元数值模型；内聚力；Mullins效应

苯并噁嗪基有机硅粘接剂的催化固化研究

王远榕，黄婷婷，付鹏霄，肖瑞志，姜振浩，杨智慧，卢海峰

（山东大学化学与化工学院，特种功能聚集体材料教育部重点实验室，山东济南  250100）

【摘  要】苯并噁嗪作为一种性能优异的热固性树脂在航空航天、电子电气等领域具有广泛的应用，但它也表现出固化温度高、可加工性差、脆性大等缺点。有机硅化合物以其优异的韧性和低表面张力等特点引起了研究者们的关注，较低的表面张力使其更容易在材料上铺展。基于此，本文对苯并噁嗪基有机硅粘接剂进行研究，通过使用不同比例的有机酸（如对甲苯磺酸、冰醋酸、磷酸）或有机碱（如苯胺、乙醇胺、2-甲基-1,5-戊二胺）进行催化，研究不同催化剂催化下粘接剂在铁片或特种板上的粘接强度对比。研究结果表明：对甲苯磺酸或磷酸催化固化铁片粘接时，分别在120 ℃或100 ℃固化工艺下达到了比本体更好的催化效果，分别为4.68和4.32 MPa。有机碱类催化剂催化固化铁片或特种板粘接时，2-甲基-1,5-戊二胺被证明是最优催化剂；当m(2-甲基-1,5-戊二胺)∶m(粘接剂)质量比分别为1∶9或1∶18时，在铁片或特种板上都达到了更好的粘接效果，这印证了该催化剂有较好的催化效果。使用2-甲基-1,5-戊二胺可以有效降低开环固化温度，同时提高粘接强度(120 ℃下达到9.92 MPa)，这为实现苯并噁嗪基有机硅粘接剂的低温固化提供了有效思路。

【关键词】苯并噁嗪；有机硅；粘接剂；催化剂

耐候型聚烯烃粘接胶膜性能研究

唐舫成，杜  壮，邓志业，汪加胜，杨  涛

（广州鹿山新材料股份有限公司，广东广州 510530）

【摘  要】通过聚烯烃改性技术分别制备出具有耐候性能和粘接性能的改性聚烯烃材料，再将这些改性聚烯烃材料通过共挤吹膜工艺一体化成型，制备兼具耐候性能和粘接性能的功能性聚烯烃胶膜。对该胶膜的加工成膜、耐候性能和粘接性能进行进一步评估和研究。研究结果表明：胶膜内、中、外三层材料的厚度比例约为28∶31∶41时，三种材料下料、塑化、吹胀成膜等加工性能良好，胶膜横向和纵向的力学性能均良好，对钢板、铝板、镀锌板均有良好的粘接效果。当其作为金属表面涂层使用时，具备一定的耐酸碱腐蚀性能，并且胶膜与金属形成的粘接界面性能稳定可靠，耐气候老化和耐热氧老化性能优异，可作为具有耐候性和粘接功能的金属复合材料涂层使用。

【关键词】聚烯烃；粘接胶膜；剥离强度；老化

座舱透明件边缘连接用环氧胶膜的粘接工艺研究

李  言

（中国航空制造技术研究院，北京  100024）

【摘  要】采用非等温差示扫描量热法研究了J-351环氧胶膜的固化行为，利用T-β外推法计算出J-351环氧胶膜的理论固化温度范围。进而对座舱透明件边缘连接用环氧胶膜使用过程中关于固化温度、表面处理、加压方式等方面的性能参数进行试验论证，得出最佳粘接工艺。通过典型结构样件的疲劳试验，验证工艺可行性，为大尺寸座舱透明件进行边缘粘接提供关键工艺参数。研究结果表明：⑴J-351环氧胶膜的固化反应为单一放热峰。根据T-β外推法可知，J-351环氧胶膜的理论反应温度范围为70.92~127.21 ℃。⑵当固化温度为85 ℃、固化时间为6 h时，胶膜的剪切强度可达到座舱透明件边缘连接的使用要求。增加预固化步骤可有效改善胶膜与有机玻璃或涤丝带之间的浸润性。⑶采用320目砂纸打磨和真空加压的方式效果最好。⑷相对最优化工艺条件为：有机玻璃表面采用320目砂纸打磨，70 ℃下预固化1 h，85 ℃下固化6 h，真空袋加压，压力为0.1 MPa。所制得边缘连接粘接件的剪切强度约为234 kN/m，典型结构件的疲劳循环次数可达150 000次，疲劳极限载荷可达到8.352 kN，可满足座舱透明件边缘连接的使用要求。

【关键词】固化温度；表面处理；加压方式；疲劳

环氧-酚醛-双马来酰亚胺三元共混物的制备及性能研究

王晓蕾¹，戴晟伟¹，张有生²，杨昶旭¹，韩淑军¹，齐悦新¹，刘金刚¹

[1.中国地质大学（北京）材料科学与工程学院，地质碳储与资源低碳利用教育部工程研究中心，北京  100083；2.浙江嘉民新材料有限公司，浙江嘉兴  314011]

【摘  要】采用4,4′-二苯甲烷双马来酰亚胺（BMI）与多芳环型酚醛树脂、多芳环型环氧树脂（NC3000）及促进剂2-苯基-4-甲基-5-羟甲基咪唑（2P4MHZ）熔融共混，制备了三元树脂共混物（BPE）及其固化产物，并对其性能进行了评价。研究结果表明：BPE三元树脂共混物仅出现了一种固化行为，在现有环氧塑封料（EMC）制备工艺中可固化完全；结构特征分析表明，成功制备了BPE三元树脂共混物，并且三元树脂之间发生了相互交联反应；三元树脂共混物的结晶状态及流变学分析表明，三元共混物呈现出明显的非晶特性，随着温度的升高，熔体黏度均开始下降，在140~160 ℃时达到最低值，然后随着凝胶化会迅速增加几个数量级，并且在110~160 ℃内存在一定的加工窗口，对EMC的制备是有利的；随着BMI含量的增加，三元树脂固化物的耐热稳定性也在不断增加，10%的热分解温度均超过430℃；此外，BMI引入也使得共混物凝胶时间延长，并且破坏了环氧/酚醛树脂体系的固化交联，导致高温热老化失重的增多。

【关键词】双马来酰亚胺；环氧树脂；环氧塑封料（EMC）；热稳定性

环氧树脂填充复合蜂窝夹芯结构吸波性能的试验及模拟研究

张  伟¹，韩阳阳²，黄绍梁¹，刘亚青¹，赵贵哲¹，梁超博¹

（1.中北大学，纳米功能复合材料山西省重点实验室，山西太原  030051；

2.中国电子科技集团公司第三十三研究所，山西太原  030032）

【摘  要】设计了一种由四氧化三铁@还原氧化石墨烯（Fe₃O₄@rGO）气凝胶/环氧树脂填充的复合蜂窝夹芯结构（CHSS）。采用拉曼光谱仪、X射线光电子能谱等方法对Fe₃O₄@rGO粒子进行表征，并对其电磁参数和吸波性能进行分析。研究结果表明：成功制备了Fe₃O₄@rGO，并且Fe₃O₄在气凝胶中分散良好；Fe₃O₄@rGO对电磁波的导电损耗以及磁损耗为材料提供了良好的微波吸收性能，CHSS的有效吸波带宽随着Fe₃O₄@rGO气凝胶/环氧树脂层厚度增大呈先增大再减小的趋势；当CHSS中Fe₃O₄@rGO气凝胶/环氧树脂层厚度为2.5 mm时有效吸波带宽达到最大值，性能最佳的CHSS厚度为7.8 mm，有效吸波带宽达到7.09 GHz，最大反射损耗（RL）值达到-17.76 dB。综合表明，本研究制备了一种复合蜂窝夹芯材料，并且使用环氧树脂回填封装芳纶蜂窝可以达到理想的吸波性能。

【关键词】气凝胶；环氧树脂；芳纶蜂窝；吸波性能

Research progress on the application of optically clear adhesive in touch screen

Wang Mingyang¹, Li Minghao¹, Jiang Baian¹, Xu Yichen¹,Wang Hong², Zhao Biao¹

(1.College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China; 2. Beijing Dwin Technology Co., Ltd., Beijing    100089, China)

【Abstract】As one of the simplest ways of human-computer interaction, touch screen is rapidly replacing the traditional electronic display in recent years. Optically clear adhesive (OCA) is a transparent optical pressure-sensitive adhesive with high light transmittance and considerable adhesion, which is widely used to bond different layers of touch screen. OCA can effectively enhance the optical effect, touch responsiveness, and mechanical reliability of touch screen, reduce screen glare, and provide better visual experience for users. In this paper, the characteristics, classification, curing methods, bonding mechanisms, and technical progress of OCA were systematically introduced, and its future development prospects were also discussed.

【Keywords】optically clear adhesive; classification; curing method; bonding mechanism; research progress

Research progress of bio-based polymer modified asphalt

Tian Peijun¹, Kan Shiyun²,Zhang Zengping², Qian Jianhang³, Yang Yang¹,Xia Jingjie¹, Liu Hao²

（1. Ningbo Dongxing Asphalt Products Co., Ltd., Ningbo  315000, Zhejiang, China; 2. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an  710064, Shaanxi, China; 3.Chang’an Dublin International College of Transportation, Chang’an University, Xi’an  710018, Shaanxi, China）

【Abstract】With the vigorous development of China’s road and bridge construction, modified asphalt gradually occupies the application market, and adding high polymers such as epoxy resin, polyurethane, phenolic resin to asphalt can obtain high-performance modified asphalt or asphalt mixture. In order to reduce the consumption of non-renewable resources and facilitate the sustainable development of road engineering, bio-based raw materials are gradually replacing petroleum-based raw materials. In this paper, the raw materials and research progress of resin modified asphalt (bio-based polyurethane, bio-based phenolic resin), bio-based rubber modified asphalt, bio-based natural elastomer modified asphalt, and bio-based composite modified asphalt were mainly reviewed and summarized, and the latest research results of bio-based modifiers (plant oil, plant phenols, lignin, rosin, itaconic acid, etc.) were also shared. The current problems of bio-based polymer modified asphalt were proposed, and finally, the future development prospects were discussed.

【Keywords】modified asphalt; bio-based polymer; modification mechanism

Research and application progress of PVC weld seam sealant for car body coating

Yu Hu, Yang Shiyong, Meng Hui, Lu Zhuo, Duan Chenjie

(Jinan Hansiman Times Technology Co., Ltd., Ji’nan250031, Shandong, China)

【Abstract】The development of the automotive industry has put forward higher requirements for body sealing, and PVC weld seam sealant, as one of the most important types of coating adhesive, has received increasing attention in its research. In this paper, the public reports and industry research progress on the formulation and construction technology of PVC weld seam sealant in China in recent years were summarized, mainly including the mechanical properties, construction properties, environmental performance, construction technology, and special vehicle requirements of PVC weld seam sealant. Finally, a summary and outlook were provided.

【Keywords】PVC weld seam sealant; car body sealing; construction technology; coating

Study on bonding properties of cellulose-based epoxy resin and its wood adhesive

Zhang Tongtong¹, Wang Fang¹, Zhou Zi², Zhu Xinbao^1,2

(1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China; 2. Anhui Xinyuan Technology Co., Ltd., Huangshan 245900, Anhui, China)

【Abstract】Liquid cellulose-based epoxy resin (PHECEP) was synthesized by grafting liquefaction reaction with ethylene oxide (EO) using alkali activated cellulose as raw material. Then, using E-51 as the matrix resin, amine T31 as the curing agent, silica powder, silane coupling agent KH-560 and PHECEP as modifiers, cellulose-based epoxy resin adhesive was prepared, and its mechanical properties, thermal properties, and chemical resistance were tested. The research results showed that, when the addition amount of PHECEP was 20%, the impact strength increased from 2.9 kJ/m²to 50.9 kJ/m². When the addition amount of PHECEP was 5%, the tensile shear strength of cellulose-based adhesive cured for 7 d at room temperature was 171.1% higher than that of pure E-51. After adding PHECEP, the actual tensile shear strength was higher than the tested strength, and the tolerance was better in small molecule solvents. Through the comprehensive evaluation of mechanical properties, wet/dry bonding strength, thermal stability, and chemical resistance of PHECEP/E-51 materials, the relatively optimal formula of wood adhesive was obtained as follows: 5% PHECEP (relative to the mass of E-51), 1% KH-560, 60% silica powder, and 18% T31 curing agent (relative to the total mass of PHECEP and E-51, respectively).

【Keywords】cellulose; cellulose-based epoxy resin; bisphenol A type epoxy resin; wood adhesive; bonding property

Construction of finite element numerical calculation model for interfacial bonding strength evaluation of composite elastomer

Yang Min, Xu Yonglun, Wang Shuting, Pang Yunsong, Ren Linlin, Zeng Xiaoliang, Sun Rong

（Shenzhen Institute of Advanced Electronic Materials, Shenzhen  518100, Guangdong, China）

【Abstract】Based on silicone gel composite elastomer, finite element numerical calculation model was constructed to calculate the interfacial bonding strength. This model included cohesive force and mechanical model of hyper elastic materials with Mullins effect, which respectively described the energy loss at the interface of composite elastomers during peeling and the energy loss during deformation of surrounding materials. Abaqus could be used to directly implement examples, and the relevant calculation parameters required for the examples could be obtained through corresponding material mechanics characterization. Due to the similarity in the trend, amplitude, and interval of the data curve with the experimental results, it proved that the constructed finite element numerical model had a certain degree of accuracy. This study provided a new approach for predicting material properties through finite element numerical calculations, which replaced the complex experimental characterization methods.

【Keywords】composite elastomer; interfacial bonding strength; finite element numerical calculation; cohesive force; Mullins effect

Study on catalytic curing of benzoxazine-based organosilicone adhesive

Wang Yuanrong, Huang Tingting,Fu Pengxiao, Xiao Ruizhi, Jiang Zhenhao, Yang Zhihui, Lu Haifeng

(School of Chemistry and Chemical Engineering, Shandong University, Key Laboratory of Special Functional Aggregate Materials, Ministry of Education, Ji’nan 250100, Shandong, China )

【Abstract】As a thermosetting resin with excellent performance, benzoxazine has been widely used in aerospace, electronics and electrical fields. However, it also shows the disadvantages of high curing temperature, poor processability, and high brittleness. Organosilicone compounds have attracted the attention of researchers because of their excellent toughness and low surface tension, which make them easier to spread on the material due to their low surface tension. Based on this, the benzoxazine-based organosilicone adhesive was studied in this paper. By using different proportions of organic acids (such as p-toluenesulfonic acid, glacial acetic acid, phosphoric acid) or organic bases (such as aniline, ethanolamine, 2-methyl-1,5-pentanediamine) for catalysis, the bonding strength of the adhesive on iron sheet or special plate under different catalytic conditions was compared. The research results showed that, when p-toluenesulfonic acid or phosphoric acid was used to catalyze the bonding of iron sheet, better catalytic effects were achieved at 120 ℃ or 100 ℃ curing processes than the original body, with values of 4.68 and 4.32 MPa, respectively. When organic base catalysts were used to catalyze the bonding of iron sheet or special plate, 2-methyl-1,5-pentanediamine had been proven to be the optimal catalyst. When the mass ratio of m(2-methyl-1,5-pentanediamine)∶m(adhesive) was 1∶9 or 1∶18, respectively, better bonding effects were achieved on iron sheet or special plate, which confirmed that this catalyst had excellent catalytic effect. The use of 2-methyl-1,5-pentanediamine could effectively reduce the ring opening curing temperature and improved the bonding strength (reaching 9.92 MPa at 120 ℃), which provided an effective approach for achieving low-temperature curing of benzoxazine-based organosilicone adhesive.

【Keywords】benzoxazine; organosilicone; adhesive; catalyst

Research on the properties of weather-resistance polyolefin adhesive film

Tang Fangcheng, Du Zhuang, Deng Zhiye, Wang Jiasheng, Yang Tao

(Guangzhou Lushan New Materials Co., Ltd., Guangzhou 510530, Guangdong, China)

【Abstract】Modified polyolefin materials with weather-resistance and bonding properties were prepared separately by using polyolefin modification technology, and then these modified polyolefin materials were integrated through molding process of co-extrusion film blowing to prepare functional polyolefin adhesive film with both weather-resistance and bonding properties. The processing, weather resistance, and bonding properties of adhesive film were further evaluated and studied.The research results showed that, when the thickness ratio of the inner, middle, and outer layers of adhesive film was about 28∶31∶41, the three materials had good processing properties such as cutting, plasticizing, and blowing to form a film. The mechanical properties of adhesive film in both horizontal and vertical directions were good, and it had good bonding effects on steel plate, aluminum plate, and galvanized plate. When used as the coating of metal surface, it had a certain degree of acid and alkali corrosion resistance, and the adhesive interface between the adhesive film and the metal was stable and reliable. It had excellent weather resistance and heat and oxygen aging resistance, which could be used as the coating of metal composite materials with weather resistance and bonding functions.

【Keywords】polyolefin; adhesive film; peeling strength; aging

Research on bonding process of epoxy adhesive film for edge connection of cockpit transparent parts

Li Yan

(AVIC Manufacturing Technology Institute, Beijing100024, China)

【Abstract】The curing behavior of J-351 epoxy adhesive film was studied by using non isothermal differential scanning calorimetry method, and the theoretical curing temperature range of J-351 epoxy adhesive film was calculated by using T-β extrapolation method.Furthermore, experimental verification was conducted on the performance parameters related to curing temperature, surface treatment, and pressure method during the use of epoxy adhesive film for edge connection of cockpit transparent parts, and the optimal bonding process was determined.By conducting fatigue tests on typical structural components, the feasibility of the process was verified, which provided key process parameters for edge bonding of large-sized cockpit transparent parts. The research results showed that, ⑴ The curing reaction of J-351 epoxy adhesive film was a single exothermic peak. According to T-β extrapolation method, it showed that the theoretical reaction temperature range of J-351 epoxy adhesive film was 70.92-127.21℃.⑵ When the curing temperature was 85 ℃ and the curing time was 6 h, the shear strength of adhesive film could meet the requirements for edge connection of cockpit transparent parts. Adding pre-curing steps could effectively improve the wettability between adhesive film and organic glass or polyester ribbon. ⑶ The best effect was achieved by using 320 grit sandpaper for polishing and under vacuum pressure. ⑷ The relatively optimal process conditions were as follows: the surface of the organic glass was polished with 320 grit sandpaper, pre-cured at 70 ℃ for 1 h, cured at 85 ℃ for 6 h, and subject to vacuum bag pressure of 0.1 MPa. The shear strength of the edge connection adhesive component produced was about 234 kN/m, the fatigue cycle number of typical structural components could reach 150 000 times, and the fatigue ultimate load could reach 8.352 kN, which could meet the requirements for edge connection of cockpit transparent parts.

【Keywords】curing temperature; surface treatment; pressurization method; fatigue

Preparation and properties of epoxy-phenolic aldehyde-bismaleimide ternary blend

Wang Xiaolei¹, Dai Shengwei¹, Zhang Yousheng²,Yang Changxu¹, Han Shujun¹, Qi Yuexin¹, Liu Jingang¹

(1.Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China; 2. Zhejiang Jameen New Material Co., Ltd., Jiaxing  314011, Zhejiang, China)

【Abstract】A ternary resin blend (BPE) and its cured product were prepared by melt blending 4,4'-diphenylmethane bismaleimide (BMI) with polyaromatic ring phenolic resin, polyaromatic ring epoxy resin (NC3000), and promoter 2-phenyl-4-methyl-5-hydroxymethylimidazole(2P4MHZ), and their properties were evaluated.The research results showed that the BPE ternary resin blend only exhibited one curing behavior, which could be fully cured in the existing epoxy molding compound (EMC) preparation process. Structural characteristic analysis showed that the BPE ternary resin blend had been successfully prepared, and mutual crosslinking reactions had occurred between the ternary resins. The crystalline state and rheological analysis of the ternary resin blend showed that the ternary resin blend exhibited obvious amorphous characteristics. With the increase of temperature, the melt viscosity began to decline, reaching the lowest value at 140-160 ℃, and then rapidly increased several orders of magnitude with gelation, and there existed a certain processing window at 110-160 ℃, which was beneficial to the preparation of EMC.With the increase of BMI content, the heat resistance stability of the cured ternary resin was also constantly increasing, and the thermal decomposition temperature of 10% exceeded 430 ℃.In addition, the introduction of BMI also prolonged the gel time of the blend, and destroyed the curing and crosslinking of the epoxy/phenolic aldehyde resin system, resulting in increased weight loss during high-temperature thermal aging.

【Keywords】bismaleimide; epoxy resin; epoxy molding compound (EMC); thermal stability

Experimental and simulation studies on the wave-absorbing performance of epoxy resin-filled composite honeycomb sandwich structure

Zhang Wei¹, Han Yangyang², Huang Shaoliang¹, Liu Yaqing¹,Zhao Guizhe¹, Liang Chaobo¹

(1.College of Materials Science and Engineering, North University of China, Taiyuan  030051, Shanxi  China; 2.No.33 Research Institute of China Electronics Technology Group Corporation, Taiyuan  030032, Shanxi  China)

【Abstract】The composite honeycomb sandwich structure (CHSS) filled with ferrosoferric oxide@reduced graphene oxide (Fe₃O₄@rGO) aerogel/epoxy resin was designed. The Fe₃O₄@rGO particles were characterized by Raman spectroscopy and X-ray photoelectron spectroscopy, and their electromagnetic parameters and wave-absorbing performance were analyzed. The research results showed that Fe₃O₄@rGO was successfully prepared and Fe₃O₄ was well dispersed in the aerogel. The conductive loss of Fe₃O₄@rGO to electromagnetic waves as well as the magnetic loss provided good microwave absorption performance for the material, and the effective wave-absorbing bandwidth of CHSS showed a tendency to increase first and then decrease as the thickness of the Fe₃O₄@rGO aerogel/epoxy resin layer increased. When the thickness of Fe₃O₄@rGO aerogel/epoxy resin layer in CHSS was 2.5 mm, the effective absorption bandwidth reached the maximum, the thickness of the CHSS with the best performance was 7.8 mm, the effective absorption bandwidth reached 7.09 GHz, and the maximum reflection loss (RL) value reached -17.76 dB. Comprehensively, it showed that a composite honeycomb sandwich material had been prepared in this study, and the desired wave-absorbing performance could be achieved by using epoxy resin to backfill and encapsulating the aramid honeycomb.

【Keywords】aerogel; epoxy resin; aramid honeycomb; wave-absorbing performance