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首页> 外文期刊>Journal of Applied Polymer Science >Epoxidized soybean oil modified using fatty acids as tougheners for thermosetting epoxy resins: Part 1
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Epoxidized soybean oil modified using fatty acids as tougheners for thermosetting epoxy resins: Part 1

机译：用脂肪酸改性环氧化大豆油作为热固性环氧树脂的增韧剂：第1部分

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摘要

A series of bio-rubber (BR) reactive tougheners for thermosetting epoxy resins was prepared by grafting renewable saturated fatty acids of different chain lengths (C6-C14) onto epoxidized soybean oil (ESO) at varying molar ratios. The tunable nature of the BR systems derives from the architecture and functionality of naturally occurring molecules. Control of BR reactivity and molecular weight by varying the degree of grafting and the chain length of the fatty acid was demonstrated. The BR-toughened samples were prepared by blending BRs with diglycidyl ether of bisphenol A (DGEBA), Epon 828, and stoichiometrically curing the mixture using an aromatic amine hardener, diethyl toluene diamine (Epikure W). Fracture surface morphology studies showed that tuning of phase separated particle sizes was possible depending on the BR type and weight fraction. The resulting toughening effect was evaluated by measuring the fracture toughness of control and toughened polymer samples. The use of BRs significantly improved the critical strain energy release rate and critical stress intensity factor values of thermosetting polymer samples without significantly reducing T-g and modulus. In addition to toughening and adding renewable content to petroleum-based thermosetting epoxy systems these new tougheners have low viscosity compared to common alternatives and aid ease of processing.
机译：将不同链长的可再生饱和脂肪酸（C6-C14）以不同摩尔比接枝到环氧大豆油（ESO）上，制备了一系列热固性环氧树脂用生物橡胶（BR）反应增韧剂。BR系统的可调性质来源于天然分子的结构和功能。通过改变接枝程度和脂肪酸的链长来控制BR的反应性和分子量。BR增韧样品的制备方法是将BR与双酚A二缩水甘油醚（DGEBA）、Epon 828混合，并使用芳香胺硬化剂二乙基甲苯二胺（Epikure W）进行化学计量固化。断口形貌研究表明，根据BR类型和重量分数，可以调整相分离颗粒的尺寸。通过测量控制和增韧聚合物样品的断裂韧性来评估由此产生的增韧效果。BRs的使用显著提高了热固性聚合物样品的临界应变能释放率和临界应力强度因子值，但没有显著降低T-g和模量。除了增韧和向石油基热固性环氧树脂系统中添加可再生成分外，这些新型增韧剂与普通替代品相比粘度较低，并且易于加工。

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