利用扫描电子显微镜(SEM)、差示扫描量热仪(DSC)、熔体流动速率仪和力学性能等测试方法研究了甲基丙烯酸环氧丙酯改性聚丙烯酸酯(ACR-g-GMA)核壳结构抗冲击改性剂粒子增韧尼龙(PA)1012共混物的相关性能。结果表明,当ACR-g-GMA加入量为9%...利用扫描电子显微镜(SEM)、差示扫描量热仪(DSC)、熔体流动速率仪和力学性能等测试方法研究了甲基丙烯酸环氧丙酯改性聚丙烯酸酯(ACR-g-GMA)核壳结构抗冲击改性剂粒子增韧尼龙(PA)1012共混物的相关性能。结果表明,当ACR-g-GMA加入量为9%时,PA1012/ACR-g-GMA共混体系的熔体质量流动速率降低到2.3 g/10min;SEM照片表明,弹性核壳粒子能均匀地分散在共混物中。共混物的缺口冲击强度先增加后降低,当ACR-gGMA加入量为9%时,缺口冲击强度达到最大值83.3 k J/m2,是纯PA1012的3.8倍,拉伸强度降低约18%。等温结晶得到的Avrami指数近似为2,表明共混体系成核机理为异相成核。展开更多
PA1012/calcium silicate whisker nanocomposites with contents of whisker ranging from 10 wt% to 40 wt%, are prepared by twin screw extruder without any additions of coupling agent. The effect of whisker on the matrix i...PA1012/calcium silicate whisker nanocomposites with contents of whisker ranging from 10 wt% to 40 wt%, are prepared by twin screw extruder without any additions of coupling agent. The effect of whisker on the matrix is analyzed by the studies of morphology, the mechanical properties, water absorption and thermal stabilities. SEM micrographs obviously demonstrate, even under the high filler content of 40 wt% and without surface treatment, calcium silicate whisker can be homogeneously dispersed in polyamide, directly leading to the enhanced mechanical properties. The mechanism of higher efficiency of reinforcement is needle-like shape whisker, having access to be intercalated, and mutual affinity caused by hydrogen bonding interaction between carbonyl group in polyamide chain and hydroxyl group in whisker surface. Both aspects attach matrix with excellent stress-transfer properties. In addition, with the assistance of whisker, the nanocomposite favors an improved water absorption as well as thermal stability, which is intimately associated with physical performance.展开更多
文摘利用扫描电子显微镜(SEM)、差示扫描量热仪(DSC)、熔体流动速率仪和力学性能等测试方法研究了甲基丙烯酸环氧丙酯改性聚丙烯酸酯(ACR-g-GMA)核壳结构抗冲击改性剂粒子增韧尼龙(PA)1012共混物的相关性能。结果表明,当ACR-g-GMA加入量为9%时,PA1012/ACR-g-GMA共混体系的熔体质量流动速率降低到2.3 g/10min;SEM照片表明,弹性核壳粒子能均匀地分散在共混物中。共混物的缺口冲击强度先增加后降低,当ACR-gGMA加入量为9%时,缺口冲击强度达到最大值83.3 k J/m2,是纯PA1012的3.8倍,拉伸强度降低约18%。等温结晶得到的Avrami指数近似为2,表明共混体系成核机理为异相成核。
基金financially supported by the Ministry of Science and Technology of China(No.2013BAE02B02)
文摘PA1012/calcium silicate whisker nanocomposites with contents of whisker ranging from 10 wt% to 40 wt%, are prepared by twin screw extruder without any additions of coupling agent. The effect of whisker on the matrix is analyzed by the studies of morphology, the mechanical properties, water absorption and thermal stabilities. SEM micrographs obviously demonstrate, even under the high filler content of 40 wt% and without surface treatment, calcium silicate whisker can be homogeneously dispersed in polyamide, directly leading to the enhanced mechanical properties. The mechanism of higher efficiency of reinforcement is needle-like shape whisker, having access to be intercalated, and mutual affinity caused by hydrogen bonding interaction between carbonyl group in polyamide chain and hydroxyl group in whisker surface. Both aspects attach matrix with excellent stress-transfer properties. In addition, with the assistance of whisker, the nanocomposite favors an improved water absorption as well as thermal stability, which is intimately associated with physical performance.
