Variable temperature X ray diffraction(XRD) was used to investigate the crystalline transition of Nylon 1012. The results show that Nylon 1012 undergoes a crystalline relaxation between the glass transition temperatur...Variable temperature X ray diffraction(XRD) was used to investigate the crystalline transition of Nylon 1012. The results show that Nylon 1012 undergoes a crystalline relaxation between the glass transition temperature and the melting point. We thus demonstrate, for the first time, the presence of the Brill transition in Nylon 1012, a phenomena that has been extensively studied in Nylon 66. It is found that the Brill transition temperature is about 120 ℃ and we have also showed that the Brill transition of Nylon 1012 is reversible when cooling the high temperature pseudohexagonal structure to room temperature. [WT5HZ]展开更多
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
文摘Variable temperature X ray diffraction(XRD) was used to investigate the crystalline transition of Nylon 1012. The results show that Nylon 1012 undergoes a crystalline relaxation between the glass transition temperature and the melting point. We thus demonstrate, for the first time, the presence of the Brill transition in Nylon 1012, a phenomena that has been extensively studied in Nylon 66. It is found that the Brill transition temperature is about 120 ℃ and we have also showed that the Brill transition of Nylon 1012 is reversible when cooling the high temperature pseudohexagonal structure to room temperature. [WT5HZ]
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。
