摘要
本研究合成了一种新的桐油基不饱和共酯单体,该单体既包含马来酸酯又包含丙烯酸酯;与以往不同的是~([1]),合成方法上采用了先引入马来酸酯再引入丙烯酸酯的方法。利用红外、核磁、凝胶色谱等对所得单体的结构进行了表征,其每条脂肪酸链上的易聚合C=C官能度可达2.27。研究了该单体与苯乙烯共聚固化后,原料配比、苯乙烯用量、引发剂用量等因素对树脂性能的影响。该树脂性能优良,例如在40%苯乙烯含量时,其交联密度达4.03×10~3mol/m~3,储存模量(25℃)为2.40 GPa,玻璃化转变温度(T_g)为127℃,拉伸强度和模量分别可达36.3 MPa和1.70 GPa。同时,依据共聚方程推出了树脂共聚所需苯乙烯的最佳用量,并与实验结果相一致。最后,通过比较该丙烯酸羟乙酯改性的桐油基树脂与未改性树脂,发现改性后的交联密度、热降解性能和T_g等均有所提升。该新型油脂基不饱和树脂可在模塑料领域具有较好的用途。
A novel unsaturated co-ester(co-UE) macromonomer containing both maleates and acrylates was synthesized from tung oil(TO) and its structure was characterized by FT-IR, NMR, and gel permeation chromatography(GPC). The monomer was synthesized via a new synergetic modification, by introducing maleic groups first and acrylic groups subsequently onto TO molecules. Influence of experimental factors on thermo-mechanical properties of the cured bioresins was carefully evaluated. A new theory for determining optimal comonomer concentration was further developed. The developed eco-friendly biomaterials provide potential application in structural plastics.
引文
[1]Lu,J.;Khot,S.;Wool,R.P.Polymer 2005,46(1):71.