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首页> 外文期刊>Journal of Applied Polymer Science >Microconfinement effect on gas barrier and mechanical properties of multilayer rigid/soft thermoplastic polyurethane films
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Microconfinement effect on gas barrier and mechanical properties of multilayer rigid/soft thermoplastic polyurethane films

机译：微约束对多层硬质/软质热塑性聚氨酯薄膜的阻气性和力学性能的影响

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摘要

In this article, rigid/soft thermoplastic polyurethane (TPU) films were produced via layer-multiplying co-extrusion and the effect of confinement on morphology and gas barrier and mechanical properties is studied. The soft TPU, which is 52% hard-segment, shows phase separation, while the rigid, 100% hard-segment TPU exhibits amorphous structures. Even though the viscosity ratio of the two TPUs is over 10 and the elasticity ratio around 100, optical and atomic force microscopies show that a multilayer structure was successfully achieved. Then, the multilayer TPU films were uni-axially stretched to different amounts of deformations, from 0% to 300%. DSC and WAXS results show that microconfinement occurs during orientation, which causes a significant reduction in oxygen permeability of multilayer TPU films, when stretched at 75%, by comparison to the mono and bi-layer TPU. The dependence of gas barrier properties on temperature and deformation was also investigated, and a 100% improvement in elongation at break was found when compared to films of the rigid TPU. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41849.
机译：本文通过多层共挤出生产硬质/软质热塑性聚氨酯（TPU）薄膜，并研究了封闭对形态，阻气性和机械性能的影响。硬段为52％的软TPU显示出相分离，而硬段为100％的刚性TPU显示出非晶结构。即使两个TPU的粘度比超过10，弹性比约为100，光学和原子力显微镜检查也表明成功实现了多层结构。然后，将多层TPU膜单轴拉伸至0％至300％的不同变形量。 DSC和WAXS结果表明，与单层和双层TPU相比，当在75％拉伸时，微约束作用会在取向过程中发生，从而导致多层TPU膜的透氧性显着降低。还研究了阻气性对温度和变形的依赖性，并且与刚性TPU的薄膜相比，断裂伸长率提高了100％。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41849。

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