In situ fibrillation of polyamide 6 in isotactic polypropylene occurring in the laminating-multiplying die
In situ fibrillation of polyamide 6 in isotactic polypropylene occurring in the laminating-multiplying die
复制标题
等规聚丙烯中聚酰胺 6 在层压倍增模头中发生的原位原纤化
DOI：
10.1002/pat.1525
复制
发表时间：
2011-02-01
影响因子：
3.4
通讯作者：
Guo, Shaoyun
中科院分区：
文献类型：
--
作者：
Shen, Jiabin;Wang, Ming;Guo, Shaoyun
采用一种新型的层合倍增元件挤出模头制备了聚酰胺6（PA 6）/等规聚丙烯（iPP）原位原纤化复合材料。扫描电镜照片表明，在LME中的分裂-倍增过程延长，打破，并沿沿着流动方向（FD）的iPP矩阵中的分散的PA 6相稳定。不同LME数的PA 6的形态发展对流变性能、结晶行为和力学性能有很大影响。在195°C下进行的动态流变测试表明，高长径比PA 6颗粒的空间限制增加了粘弹性模量、复数粘度和松弛时间。结晶分析表明，异质形核成为主导，并观察到穿晶形态，在这些样品中由更多的LME生产。拉伸试验表明，由于分散相的原纤化和纤维与基体界面结合力的提高，复合材料的断裂强度和断裂伸长率同时提高。版权所有© 2009约翰威利父子有限公司。
The polyamide 6 (PA6)/isotactic polypropylene (iPP) in situ fibrillation composites are prepared by a novel extrusion die with an assembly of laminating-multiplying elements (LMEs). The scanning electron micrographs illustrate that the dividing-multiplying processes in LMEs elongate, break, and stabilize the dispersed PA6 phase in the iPP matrix along the flowing direction (FD). The morphology development of PA6 with different LME numbers greatly affects the rheological properties, crystalline behaviors, and mechanical properties. The dynamic rheological test performed at 195°C shows that the increased spatial restriction of the high-aspect-ratio PA6 particles increases the viscoelastic moduli, complex viscosity, and relaxation time. The crystalline analysis reveals that the heterogeneous nucleation becomes predominant and the transcrystalline morphology is observed in those samples produced by more LMEs. The tensile tests indicate that both, breaking strength and elongation, enhanced simultaneously because of the fibrillation of dispersed phase and the improvement in interfacial adhesion between the fibers and the matrix. Copyright © 2009 John Wiley & Sons, Ltd.