摘要
以双酚E氰酸酯树脂(BEDCy)为基体树脂,选用乙酰丙酮铝[Zn(acac)_(2)]/二烯丙基双酚A(DBA)为混合催化剂,并以聚醚砜(PES)作为增韧剂,制备了一种低温固化且高韧性的氰酸酯胶黏剂。采用差示扫描量热法(DSC)、傅里叶变换红外光谱分析法和热重分析对DBA的催化效果进行了评价。并通过冲击试验、剪切试验以及热重分析探究不同比例的聚醚砜(PES)对BEDCy力学性能和热稳定性能的影响。结果表明,相较于单独使用Zn(acac)_(2)催化BEDCy,酚类化合物和Zn(acac)_(2)构成的混合催化剂有更好的催化效果,其中6%DBA与0.05%Zn(acac)_(2)对BEDCy固化的催化效果最佳,其DSC曲线的峰温从218℃降到了194℃,实现了在200℃以下的完全固化;与壬基酚(NoP)/Zn(acac)_(2)/BEDCy体系相比,DBA/Zn(acac)_(2)/BEDCy体系具有更好的固化性能和热稳定性;以5%PES作为CE的增韧剂时,粘接强度比未改性的CE树脂提高了64%;且其5%热失重温度达到了430℃,具有良好的耐热性,实现了胶黏剂耐温性和韧性上的统一。
A low-temperature curing and high-toughness cyanate ester adhesive was developed using bisphenol-E cyanate ester(BEDCy)as the base resin.The adhesive system employed a hybrid catalyst of aluminum acetylacetonate[Zn(acac)_(2)]and diallylbisphenol A(DBA),with polyethersulfone(PES)as a toughening agent.The catalytic performance of DBA was evaluated by differential scanning calorimetry(DSC),Fourier-transform infrared spectroscopy,and thermogravimetric analysis.Results indicated that the Zn(acac)_(2)/DBA hybrid catalyst was more effective than Zn(acac)_(2)alone in promoting the curing of BEDCy.An optimal formulation with 6 wt%DBA and 0.05 wt%Zn(acac)_(2)reduced the DSC curing peak temperature from 218 to 194°C,enabling complete curing below 200°C.This DBA/Zn(acac)_(2)/BEDCy system also exhibited superior curing properties and thermal stability compared to a system catalyzed by nonylphenol.Furthermore,the impact of PES content on the mechanical and thermal properties was investigated.The incorporation of 5 wt%PES as a toughener resulted in a 64%increase in bond strength compared to the unmodified CE,while maintaining a high 5%weight-loss temperature of 430℃.This work successfully achieves an adhesive with an effective balance of low curing temperature,high toughness,and excellent thermal resistance.
作者
柏安江
秦雨
蔡璐
赵永龙
章家立
BAI Anjiang;QING Yu;CAI Lu;ZHAO Yonglong;ZHANG Jiali(School of Materials Science and Engineering,East China JiaoTong University,Nanchang 330000,China)
出处
《中国塑料》
北大核心
2025年第12期20-26,共7页
China Plastics
基金
国家自然科学基金项目(52361014)
国家自然科学基金项目(21865009)。
关键词
氰酸酯
胶黏剂
低温固化
增韧
cyanate ester
adhesive
low temperature curing
toughen
