合成了反应性核壳结构增韧剂ABS-g-MA和ABS-g-AA增韧PA6,2种增韧剂的唯一差别在于壳层接枝的反应性单体不同,从而在与PA6共混过程中相界面存在差异,研究在其他参数都相同的条件下,界面性质对ABS/PA6共混体系脆韧转变及断裂行为的影响.Molau试验与扭矩试验证实ABS-g-MA/PA6共混物具有更佳的界面强度.TEM结果表明2种增韧剂在PA6中均匀分散,然而力学测试结果表明ABS-g-MA/PA6共混物在分散相质量分数为25%～30%时发生脆韧转变,冲击强度可以达到900 J/m以上,ABS-g-AA/PA6共混物在分散相质量分数为30%～35%时发生脆韧转变.SEM结果表明ABS-g-MA/PA6共混物断面发生显著的塑性形变.TEM表明ABS-g-MA/PA6共混物的形变机制为橡胶粒子的空洞化与塑料基体的剪切屈服,而ABS-g-AA/PA6体系没有空洞化现象,基体剪切屈服不明显.Vu-Khanh方法测试表明,由于ABS-g-MA/PA6共混物更高的界面强度,共混物具有更高的G1值,因此冲击韧性极佳.
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