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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Effect of the content of beta form crystals on biaxially stretched polypropylene microporous membranes and the tuning of pore structures
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Effect of the content of beta form crystals on biaxially stretched polypropylene microporous membranes and the tuning of pore structures

机译:β形成晶体含量对双轴拉伸聚丙烯微孔膜的影响及孔隙结构的调谐

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摘要

In this article, the content of beta crystals in polypropylene (PP) cast films was adjusted by annealing treatment. Subsequently, the effect of the content beta crystals on the pore structures and the porosity of PP microporous membranes was investigated. It was found that annealing could improve the long period of lamella stacking and the lamellar thickness, without altering the crystalline morphology and orientation of cast films. The microporous membranes with high porosity and uniform pores and pore-size distribution could be obtained by biaxial stretching. Interestingly, the pore structures of these microporous membranes were quite different. The sample composed of beta transcrystals (beta-TCs) have only a few or no obvious connecting bridge structures in microporous membranes. However, the sample composed of pure alpha transcrystals (alpha-TCs) had a large number of connecting bridge structures, as well as the pores distribution and pore-size distribution were also uniform. These results indicated that the pore structures of microporous membranes could be adjusted by the content of beta crystals in PP cast films and homogeneous microporous membranes could also be obtained by biaxial stretching other crystalline forms of PP materials. It afforded a new insight to obtain PP microporous membranes with excellent performance.
机译:在本文中,通过退火处理调节聚丙烯(PP)浇铸膜中的β晶体的含量。随后,研究了含量β晶体对孔隙结构和PP微孔膜的孔隙率的影响。发现退火可以改善薄片堆叠的长期和层状厚度,而不改变铸造薄膜的晶体形态和取向。通过双轴拉伸可以获得具有高孔隙率和均匀孔和孔径分布的微孔膜。有趣的是,这些微孔膜的孔结构均有很大差异。由β经晶(Beta-TCS)组成的样品仅具有微孔膜中的几个或没有明显的连接桥结构。然而,由纯α经晶体(α-TCS)组成的样品具有大量连接桥结构,以及孔分布和孔径分布也是均匀的。这些结果表明,通过PP浇铸膜中的β结晶含量可以调节微孔膜的孔结构,并且通过双轴拉伸其他晶体形式的PP材料也可以获得均匀的微孔膜。它提供了新的洞察力,可以获得具有出色性能的PP微孔膜。

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