The structure of isotactic polypropylene in composites filled with lignocellulosic material

ABSTRACT

Biodegradability of fillers, interesting physical and mechanical properties of polypropylene/lignocellulosic materials are essential motives for undertaking studies of various properties of such materials. Up to now, there have been no complex investigations defining processing of polypropylene/rapeseed straw composites. This study presents the results of research into finding optimal technological parameters of extrusion and injection molding methods. The structural investigations were done using the wide-angle X-ray scattering method. Crystallization of polypropylene in composites filled with rapeseed straw is connected with interfacial interactions, such as shearing forces at the boundary of phases: polypropylene matrix—mold wall—lignocellulosic filler. The value of the melt flow index (MFR) for polypropylene influences the crystallization structure of the crystallization in the injection molding process. Moreover, various parts of dumbbells have different structure of the matrix, which is caused by shearing forces and cooling conditions during the polypropylene processing.

摘要

填料的生物降解，有趣的物理和机械性能的聚丙烯/木质纤维素材料进行研究这种材料的各种性能的本质动机。到目前为止，对聚丙烯/油菜秸秆复合材料的加工尚无深入的研究。本研究提出了寻找最佳工艺参数的挤出和注射成型方法的研究结果。

采用广角X射线散射法进行了结构研究。在油菜秸秆复合材料填充聚丙烯的结晶与界面的相互作用，如剪切力在相边界：聚丙烯基体–模具壁–木质纤维素填料。的MFR值影响聚丙烯在注塑成型过程中的结晶的结晶结构。此外，哑铃各部分有不同的矩阵结构，这是由剪切力和冷却条件下聚丙烯加工过程中造成的。

KEYWORDS:

• Composites
• polypropylene
• lignocellulosic fillers
• matrix structure
• iPP polymorphism
• injection molding

关键词:

• 复合材料
• 聚丙烯
• 木质纤维填料
• 矩阵结构
• 的多态性
• 注射成型

Funding

This research was funded by the Poznan University of Technology grant no. 03/32/DSPB/0803.