界面对ABS/PA6共混体系脆韧转变及断裂行为的影响  

Effect of interface on brittle-ductile transition and fracture behavior of ABS/PA6 blends

作　　者：孙树林[1] 孙丽丽[1] 张会轩[1,2] 

机构地区：[1]长春工业大学教育部合成树脂与特种纤维工程研究中心,长春130012 [2]中国科学院长春应用化学研究所,长春130022

出　　处：《复合材料学报》2010年第4期111-117,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(50803007);吉林省科技发展计划项目(20090142)

摘　　要：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G_i值,因此冲击韧性极佳。Reactive core - shell modifiers of ABS - g - MA and ABS - g - AA were synthesized to toughen PA6. The difference between the modifiers lays in the reactive monomers on the shell, which would induce different interface properties between the PA6 blends. So the brittle - ductile transition and fracture behavior of the blends were studied when the other parameters were the same. Molau test and torque results indicate ABS - g - MA/PA6 shows superior interface strength. TEM shows ABS - g - MA and ABS - g - AA modifiers disperse in PA6 matrix uniformly. Mechanical test shows brittle- ductile transition takes place between 25 %-30 % modifiers mass fraction for ABS -g-MA/PA6 blends and impact strength more than 900 J/m is achieved, however, brittle - ductile transition takes place between 30%- 35% modifiers mass fraction for ABS - g - AA/PA6 blends. Fracture mechanisms display cavitation of rubber particles and shear yielding of matrix are the major deformation mechanisms for ABS-g- MA/PA6 blends, however, no cavitation can be found and shear yielding is indistinctive for ABS-g- AA/PA6 blends. Vu-Khanh test shows ABS-g- MA/PA6 blends have much higher Gi value and toughness due to the higher interface strength.

关 键 词：PA6 界面 脆韧转变 断裂 核-壳增韧剂 

分 类 号：TB332[一般工业技术—材料科学与工程]