Synthesis and properties of dimer fatty acid modified styrene polyester resin

doi:10.11949/j.issn.0438-1157.20170436

Abstract

Abstract:

General unsaturated polyester resin (UPR) was synthetised by maleic anhydride,phthalic anhydride and 1,2-propylene glycol. While due to its highly crosslinked structure of rigid benzene ring after curing,it will cause the polymer with slow toughness,high brittleness,flammable and high shrinkage. C₃₆ dimer fatty acid modified styrene polyester resin materials were prepared by using C₃₆ dimer fatty acid,phthalic anhydride,maleic anhydride and 1,2-propylene glycol,styrene as the cross-linking agent,benzoyl peroxide as the initiator. The structure and surface morphology of tensile of resin were characterized by FT-IR and SEM. The study found that the DFA was introduced into the main chain of the resin,and the fracture mode changed from brittle fracture to ductile fracture. In this study,the effects of various mole fractions of DFA on the thermal stability,mechanical properties and solvent resistance of the resin were investigated by TG,DSC,tensile,bending,hardness and solvent resistance test. Study found that when the DFA content is 6% (mole fraction),modified UPR materials contain the best comprehensive performance. The initial thermal decomposition temperature from 147℃ to 201℃,the glass transition temperature reduced from 146.6℃ to 120.7℃. The tensile strength,elongation at break,modulus of elasticity,Shore hardness and bending strength were 7.23,2.90,7.84,1.63 and 5.12 times that unmodified UPR material. And resistance to solvent loss rate were reduced by more than 70%. In conclusion,DFA can be used as a kind of efficient toughening agent,helps to improve the toughness of the styrene polyester resin,and to broaden the scope of application of styrene polyester resin.

Key words: C₃₆ dimer fatty acid, styrene polyester resin, polymerization, preparation, elasticity, toughening

摘要：

以C₃₆二聚脂肪酸、邻苯二甲酸酐、顺丁烯二酸酐和1，2-丙二醇为原料合成不饱和聚酯树脂（UPR）。以苯乙烯为交联剂、过氧化苯甲酰为引发剂，固化后得到C₃₆二聚脂肪酸（DFA）改性苯乙烯聚酯树脂。采用FT-IR和SEM表征树脂结构及拉伸断面形貌，研究发现DFA引入树脂主链且发生反应，树脂断裂方式由脆性断裂转变为韧性断裂。通过TG、DSC、拉伸、弯曲、硬度和耐溶剂实验研究了DFA用量对树脂热稳定性、力学性能和耐溶剂性能的影响。当DFA含量为6%（摩尔分数）时，改性UPR材料的综合性能最佳，初始热分解温度由147℃增加到201℃，玻璃化转变温度由146.6℃降低到120.7℃，拉伸强度、断裂伸长率、弹性模量、邵氏硬度、弯曲强度分别是未改性树脂的7.23、2.90、7.84、1.63、5.12倍，而且耐溶剂损失率均降低70%以上。DFA可以改善苯乙烯聚酯树脂的柔韧性，是一种有效的增韧改性剂。

关键词: C₃₆二聚脂肪酸, 苯乙烯聚酯树脂, 聚合, 制备, 弹性, 增韧

CLC Number:

TQ322.4⁺1

GUO Yanting, YIN Yaoqi, HUANG Xue, CHEN Man, FENG Guangzhu. Synthesis and properties of dimer fatty acid modified styrene polyester resin[J]. CIESC Journal, 2017, 68(S1): 266-275.

郭妍婷, 尹垚骐, 黄雪, 陈曼, 冯光炷. 基于二聚脂肪酸改性苯乙烯聚酯树脂的合成及性能[J]. 化工学报, 2017, 68(S1): 266-275.

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