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首页> 外文期刊>Polymers for advanced technologies >Films on amorphous polyamide nanocomposites: structure and properties
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Films on amorphous polyamide nanocomposites: structure and properties

机译：非晶态聚酰胺纳米复合材料上的薄膜：结构和性能

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摘要

The ability of a nanoclay to improve the transport and mechanical properties of amorphous polyamide (aPA)-based films was studied as a function of the draw ratio (DR) and the nanoclay content. The presence of nanoclay did not hinder the drawing ability as the maximum DR of the nanocomposites (NCs) and of the aPA were almost the same (51 for the aPA and from 51 to 55 for the NCs). The high degree of exfoliation and orientation along the drawing direction led to a 30% reduction in the water diffusion coefficient compared with the aPA. Moreover, the already low permeability of the aPA to oxygen was halved. The modulus of elasticity presented unusual increases both in the machine and transverse directions. Both increases of properties were attributed to the planar geometry of the oriented nanoclay sheets. The effects of the presence of nanoclay on the modulus of elasticity in the draw direction in addition to the effects caused by drawing lead to a combined modulus increase of 65% in the highly drawn 6% NC films. The nanoclay also reduced the modulus anisotropy of the films. An increase in either the nanoclay content or the DR causes a decrease in ductility due to both the stress concentrations created by the nanoclay and to the increasing number of chain segments located parallel to the drawing direction. The dimensional stability of the films greatly increased as the addition of 6% nanoclay led to a 70% decrease in creep deformation after 120 h.
机译：研究了纳米粘土改善基于非晶聚酰胺（aPA）的薄膜的传输和机械性能的能力，该函数是拉伸比（DR）和纳米粘土含量的函数。纳米粘土的存在并不妨碍拉伸性能，因为纳米复合材料（NCs）和aPA的最大DR几乎相同（aPA为51，NCs为51至55）。与aPA相比，高度的剥落和沿拉伸方向的取向导致水扩散系数降低了30％。此外，aPA对氧气的本来就很低的渗透率减半。呈现出的弹性模量在纵向和横向均异常增加。两种性能的提高均归因于取向纳米粘土片的平面几何形状。纳米粘土的存在对拉伸方向的弹性模量的影响以及拉伸所引起的影响，在高度拉伸的6％NC薄膜中，复合模量增加了65％。纳米粘土还降低了膜的模量各向异性。纳米粘土含量或DR的增加都会导致延展性的下降，这是由于纳米粘土产生的应力集中以及平行于拉伸方向的链段数量增加所致。膜的尺寸稳定性大大增加，因为添加了6％的纳米粘土导致120 h后蠕变变形降低了70％。

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