摘要
针对传统预浸料用环氧树脂难以降解的环境问题,以乙基香兰素、季戊四醇为生物基原料合成含螺缩醛结构的环氧树脂(AE),将其与E51环氧树脂按3∶7质量比共混,以双氰胺(DICY)为固化剂、100A-U为促进剂制备预浸料用环氧树脂。通过三辊压机辗轧实现组分均匀分散,经梯度升温固化工艺制得固化材料。结果表明:预浸料固化物玻璃化转变温度(T_(g))达123.9℃,5%热失重温度(T_(5%))高于290℃,兼具优异热稳定性;拉伸强度80.6MPa、断裂伸长率8.75%,较E51空白组提升45.5%和49.6%,归因于螺缩醛环刚性结构对分子链的增强作用及动态键赋予的形变自由度;水接触角76.8°,疏水性能优于E51环氧树脂。降解实验表明,预浸料体系在0.3mol/L盐酸溶液中10h内可完全降解,降解过程分为初始溶胀、快速降解和扩散控制三阶段,主要依赖缩醛键在酸性条件下的动态可逆断裂机制。通过生物基动态缩醛键的引入,实现了预浸料环氧树脂力学性能、热稳定性与可降解性的协同优化,为绿色高分子材料在复合材料领域的应用提供了新路径。
To address the environmental issue of non-degradability in traditional epoxy resins,this study synthesized an epoxy resin(AE)with spiro-acetal structures using ethyl vanillin and pentaerythritol as bio-based raw materials.The AE was blended with E51 epoxy resin at a mass ratio of 3∶7,and the prepreg epoxy resin was prepared using dicyandiamide(DICY)as the curing agent and 100A-U as the accelerator.Uniform dispersion of components was achieved via three-roll mill rolling,followed by gradient temperature curing to obtain the cured material.Performance characterization showed that the cured prepreg exhibited a glass transition temperature(T_(g))of 123.9℃and a 5%weight loss temperature(T_(5%))exceeding 290℃,demonstrating excellent thermal stability.The tensile strength and elongation at break reached 80.6MPa and 8.75%,respectively,representing improvements of 45.5%and 49.6%compared to the E51 control group,attributed to the reinforcement of molecular chains by the rigid spiro-acetal rings and the deformation freedom endowed by dynamic bonds.The water contact angle of 76.8°indicated superior hydrophobicity over E51 epoxy resin.Degradation experiments revealed that the prepreg system could completely degrade within 10hours in a 0.3mol/L hydrochloric acid solution,with the process divided into three stages:initial swelling,rapid degradation,and diffusion control,primarily relying on the dynamic reversible cleavage mechanism of acetal bonds under acidic conditions.This study achieved synergistic optimization of mechanical properties,thermal stability,and degradability of prepreg epoxy resins through the introduction of bio-based dynamic spiro-acetal bonds,providing a new pathway for the application of green polymeric materials in composite fields.
作者
陈哲瀚
贺家豪
胡超凡
代金月
刘小青
Chen Zhehan;He Jiahao;Hu Chaofan;Dai Jinyue;Liu Xiaoqing(School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315211)
出处
《化工新型材料》
北大核心
2025年第S2期162-167,共6页
New Chemical Materials
