Oriented Crystallization in Polypropylene Fibers Induced by a Sorbitol-Based Nucleator

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• 作者：Jonathan Lipp ; Michael Shuster ; Gavin Feldman ; Yachin Cohen
• 刊名：Macromolecules
• 出版年：2008
• 出版时间：January 8, 2008
• 年：2008
• 卷：41
• 期：1
• 页码：136 - 140
• 全文大小：300K
• 年卷期：v.41,no.1(January 8, 2008)
• ISSN：1520-5835

文摘

The role of 1,3:2,4-di(3,4-dimethylbenzylidene)sorbital (DMDBS) in inducing oriented crystallizationduring the melt spinning of polypropylene (PP) fibers has been investigated, regarding the tensile properties andcrystal orientation (WAXS, SAXS) of the fibers. Better orientation and higher Young's modulus were obtainedat a content of 0.4% (w/w) DMDBS, under conditions in which the DMDBS nanofibrils are fully developed inthe PP melt. It is suggested the nanofibrils, oriented by the shear and elongational flow prior to PP crystallization,serve as nucleation centers for its subsequent crystallization.