A hierarchical structure and properties of intercalated polypropylene/clay nanocomposites
A hierarchical structure and properties of intercalated polypropylene/clay nanocomposites
复制标题
DOI：
10.1016/s0032-3861(01)00512-2
复制
发表时间：
2001-10-01
期刊：
影响因子：
4.6
通讯作者：
Usuki, A
中科院分区：
文献类型：
--
作者：
Nam, PH;Maiti, P;Usuki, A
我们利用马来酸酐改性聚丙烯（PP-MA）和亲有机粘土通过熔融挤出工艺成功制备了聚丙烯（PP）/粘土（PPCNs）插层纳米复合材料。使用广角X射线衍射、小角X射线散射、透射电子显微镜、偏光光学显微镜和光散射技术，对PPCN的分级结构进行了探测，从受限的PP-MA链的结构、硅酸盐通道之间几纳米宽度的空间到7-15 nm厚度的结晶片层和10 Lm直径的球晶结构。在80℃下结晶后，PPCN形成10μm长度尺度的棒状晶体结构，其由纤维间结构组成，其中包括γ相微晶，这是由于PP链插入硅酸盐通道之间的空间和分散的粘土颗粒包围的狭窄空间中，导致PP-MA链的流动性降低而引起的。与不含粘土的 PP 基体相比，插层 PPCN 的模量有所提高。讨论了PP-MA链的插层程度对提高力学性能的必要性。 (C) 2001 Elsevier Science Ltd. 保留所有权利。
We have prepared the intercalated nanocomposites of polypropylene (PP)/clay (PPCNs) successfully using maleic anhydride modified PP (PP-MA) and organophilic clay via melt extrusion process. The hierarchical structure of the PPCNs from the structure of confined PP-MA chains, in the space a few nanometer width between silicate galleries to crystalline lamellae of 7-15 nm thickness and spherulitic texture of 10 Lm diameter, were probed using a wide-angle X-ray diffraction, small-angle X-ray scattering, transmission electron microscope, polarizing optical microscopy and light scattering. After crystallization had taken place at 80 degreesC, the PPCNs formed rod-like crystalline texture in the 10 mum length scale which consisted of the inter-fibrillar structure including gamma -phase crystallite caused by the reduction of the PP-MA chains mobility due to the intercalation of the PP chains in the space between silicate galleries and the narrow space surrounded by the dispersed clay particles. The intercalated PPCNs showed an enhancement of moduli compared with PP matrix without clay. The necessity of the intercalating degree of PP-MA chains on the enhancement of the mechanical properties are discussed. (C) 2001 Elsevier Science Ltd. All rights reserved.