TOUGHENING OF THERMOSET POLYMERS BY RIGID CRYSTALLINE PARTICLES
TOUGHENING OF THERMOSET POLYMERS BY RIGID CRYSTALLINE PARTICLES
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DOI：
10.1007/bf02403659
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发表时间：
1992-01-01
影响因子：
4.5
通讯作者：
ROBERTSON, RE
中科院分区：
文献类型：
--
作者：
KIM, JK;ROBERTSON, RE
研究了芳香胺固化的双酚 A 环氧树脂二缩水甘油醚与结晶聚合物颗粒的增韧。结晶聚合物是聚对苯二甲酸丁二醇酯、尼龙6和聚偏二氟乙烯。研究发现，尼龙 6 和聚偏二氟乙烯对环氧树脂的增韧作用与等量的 CTBN 橡胶一样。研究发现，聚对苯二甲酸丁二醇酯对环氧树脂的增韧作用约为橡胶的两倍。对于尺寸在几十微米范围内的聚(对苯二甲酸丁二醇酯)-环氧共混物的韧性与颗粒尺寸无关，但是对于小于约40微米的尺寸，尼龙6-环氧共混物的韧性随着颗粒尺寸的增加而降低。包含尼龙6或聚(对苯二甲酸丁二醇酯)的环氧树脂的杨氏模量或屈服强度没有损失，并且包含聚(偏二氟乙烯)的杨氏模量或屈服强度的损失比包含橡胶的损失更少。韧性似乎是由多种机制的组合产生的。单独的聚对苯二甲酸丁二醇酯-环氧共混物似乎通过相变增韧获得了韧性。裂纹路径的改变以及台阶和贴边的形成以及二次裂纹桥接似乎占聚偏二氟乙烯-环氧共混物断裂能的很大一部分。二次裂纹成核有助于尼龙 6-环氧共混物的韧性。
The toughening of an aromatic amine-cured diglycidyl ether of bisphenol-A epoxy with particles of crystalline polymers was studied. The crystalline polymers were poly(butylene terephthalate), nylon 6, and poly(vinylidene fluoride). Nylon 6 and poly(vinylidene fluoride) were found to toughen the epoxy about as well as did an equivalent amount of CTBN rubber. Poly(butylene terephthalate) was found to toughen the epoxy about twice as well as did the rubber. The toughness of poly(butylene terephthalate)-epoxy blends was independent of particle size for sizes in the range of tens of micrometres, but the toughness of the nylon 6-epoxy blends decreased with increasing particle size for sizes smaller than about 40-mu-m. There was no loss of either Young's modulus or yield strength of the epoxy with the inclusion of either nylon 6 or poly(butylene terephthalate) and less loss of these with the inclusion of poly(vinylidene fluoride) than with the inclusion of rubber. Toughness seems to have arisen from a combination of mechanisms. The poly(butylene terephthalate)-epoxy blends alone seem to have gained toughness from phase-transformation toughening. Crack path alteration and the formation of steps and welts and secondary crack bridging seem to have accounted for an especially large part of the fracture energy of the poly(vinylidene fluoride)-epoxy blends. Secondary crack nucleation contributed to the toughness of the nylon 6-epoxy blends.