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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Etherification Reaction on Extraction and Photoelastic and Dynamic Mechanical Behavior of Diepoxide-Diamine Networks
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Effect of Etherification Reaction on Extraction and Photoelastic and Dynamic Mechanical Behavior of Diepoxide-Diamine Networks

机译：醚化反应对二环氧化物-二胺网络萃取及光弹性和动态力学行为的影响

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Sol fraction and equilibrium photoelastic and dynamic mechanical behavior of epoxide networks based on bisphenol A diglycidyl ether (DGEBA) and poly(oxypro-pylene diamine) (Jeffamine D-400) with four initial molar ratios of epoxy (E) and amine (A) groups,#UPSILON# E = [E]_0/(2[A]_0) =1.2,1.5,2.0,and 2,3 were investigated.Networks with different extents of total epoxy group conversions (including etherifica-tion),#alpha#_E,were prepared for each #UPSILON#_E value.Both the ratio #UPSILON#_E and the conversion #alpha#_E affected the value of the equilibrium modulus,G,and the weight fraction of the gel,w_g.As expected,decreasing the #UPSILON#_E ratio (at contant #alpha#_E) and increasing #alpha#_E (at constant #UPSILON#_E) were accompanied by an increase in the modulus,G,and gel fraction,w_g.The stress optical coefficient,C,is independent of #alpha#_E decreasing with increasing #UPSILON#_E.The frequency-temperature superposition could be performed for all networks;the temperature de-pendence of the horizontal shift factor,#alpha#_TO,satisfied the WLF equation.The temper-ature and time positions of viscoelastic functions predominantly depend on the overall concentration of elastically active network chains #mu#_e,regardless of the values of #UPSILON#_E and #alpha#_e.While the shape of viscoelastic functions at the beginning of the main transition region depended on the detailed structure of the chain (number and length of pendant chains),the shape at the end of the transition was determined mainly by the concen-tration of elastically active network chains.An unexpected universal increase was found in the half-width of the maximum in the dependence of the superimposed loss compliance,J'_p,on reduced frequency #omega##alpha#_T with increasing crosslinking density.
机译：基于双酚A二缩水甘油醚（DGEBA）和聚（氧丙烯二胺）（Jeffamine D-400）的环氧网络的溶胶分数和平衡光弹性和动态力学行为，环氧和胺的四个初始摩尔比为（A）组，＃UPSILON＃E = [E] _0 /（2 [A] _0）= 1.2、1.5、2.0和2,3。研究了不同程度的总环氧基转化率（包括醚化）的网络，＃为每个＃UPSILON＃_E值准备了alpha＃_E。比率＃UPSILON＃_E和转化率＃alpha＃_E影响平衡模量G的值以及凝胶的重量分数w_g。 ，降低＃UPSILON＃_E的比例（在恒定的＃alpha＃_E下）和增加＃alpha＃_E（在恒定的＃UPSILON＃_E下）都伴随着模量G和凝胶分数w_g的增加。系数C与＃alpha＃_E随＃UPSILON＃_E的增加而减小无关。可以对所有网络进行频率-温度叠加;温度降低水平位移因子＃alpha＃_TO的ce满足WLF方程。粘弹性函数的温度和时间位置主要取决于弹性活动网络链的总浓度＃mu＃_e，而与#UPSILON的值无关#_E和＃alpha＃_e。虽然主要过渡区域开始处的粘弹性函数的形状取决于链的详细结构（侧链的数量和长度），但过渡结束时的形状主要是确定的通过增加的损耗顺应性J'_p随频率增加而降低的频率＃omega ## alpha＃_T的依赖性，在最大值的一半宽度中发现了意外的普遍增加，这是由于弹性活动网络链的浓缩而引起的。交联密度。

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