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A facile method of preparing highly porous polylactide microfibers

机译：一种制备高孔聚丙烯酸酯微纤维的容易方法

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摘要

Highly porous polylactide (PLA) microfibers with the diameter of about 14 mu m are prepared by melt-spinning and stretching core-sheath PLA fibers (CSF) and sequent treatment of ethyl acetate. The resultant pores are regular and elliptical. The average values of length of major axis and minor axis of elliptical pores are around 1 and 0.5 m, respectively. This new and facile method can prepare porous PLA fibers on industrial scale, and nearly overcome all the shortcomings of melt-spinning and stretching method. In addition, highly porous structure in partially oriented poly(l-lactide) yarn (POY) can be also formed by treating POY using ethyl acetate. The obtained pores are irregular. In addition, the formation mechanism of pore structure in CSF is different with the one in POY. The former is the separation of row-nucleated lamellae induced by stretching while the latter is swelling and subsequent solvent-induced crystallization. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45860.
机译：通过熔融纺丝和拉伸芯 - 鞘PLA（CSF）和乙酸乙酯的序列处理，制备具有约14μm的高度多孔的聚物（PLA）微纤维。所得孔是规则的和椭圆形的。椭圆孔的长轴长度和短轴的平均值分别为约1和0.5米。这种新的和容易的方法可以在工业规模上准备多孔PLA纤维，几乎克服了熔融纺丝和拉伸方法的所有缺点。另外，通过使用乙酸乙酯处理Poy，也可以通过用乙酸乙酯处理Poy来形成含有部分取向的聚（L-丙交酯）纱线（Poy）的高度多孔结构。所获得的孔不规则。此外，CSF中孔结构的形成机制与POY中的孔结构不同。前者是通过拉伸诱导的行成核薄片的分离，而后者是溶胀和随后的溶剂诱导的结晶。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,45860。

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