Fiber Structure Formation in High-speed Melt Spinning of Sheath-Core Type Bicomponent Fibers
Fiber Structure Formation in High-speed Melt Spinning of Sheath-Core Type Bicomponent Fibers
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皮芯型双组分纤维高速熔融纺丝中纤维结构的形成
DOI：
10.2115/fiber.51.9_408
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
N. Okui
中科院分区：
文献类型：
--
作者：
T. Kikutani;Sadaaki Arikawa;A. Takaku;N. Okui
对包芯型双组分纤维进行了高速熔融纺丝，研究了纤维结构随卷取速度的变化规律。选择聚对苯二甲酸乙酯（PET）、聚丙烯（PP）、高密度聚乙烯（PE）和聚苯乙烯（PS） 4种聚合物，研究了PET/PP、PET/PE和PET/PS 3组芯/护套组合。通过双折射、广角x射线散射和DSC热像图测量，分析了高速纺双组分纤维中各组分的结构。与单组分纺丝相比，PET/PP和PET/PE双组分纤维中分子取向的发展和取向诱导结晶的开始发生在较低的卷绕速度下。另一方面，PET/PP纤维中的PP在所有卷绕速度下均呈现低取向伪六边形结构，且在6km/min下获得的PET/PE纤维中PE的双折射几乎可以忽略不计，说明PP和PE组分的纤维结构形成受到抑制。相反，在PET/PS组合中，PET的结构形成受到抑制，即使在7km/min的速度下也没有取向诱导结晶的迹象。相反，PS组分的分子取向增强。根据组份聚合物的特性，推测了双组份纤维高速纺丝过程中两组份相互作用对结构形成的机理，并得出了具有较高温度依赖性的伸长粘度和较高凝固温度的组份的结构形成有望得到促进的结论。
High-speed melt spinning of sheath-core type bicomponent fibers was performed and the change of fiber structure with increasing take-up velocity was investigated. Four kinds of polymers, poly (ethylene terephthalate) (PET), polypropylene (PP), high-density polyethylene (PE) and polystyrene (PS), were selected and three sets of core/sheath combinations, PET/PP, PET/PE and PET/PS, were studied. The structure of each component in high-speed spun bicomponent fibers was analyzed through the birefringence, wide-angle X-ray scattering pattern and DSC thermogram measurements. The development of the molecular orientation and the starting of the orientationinduced crystallization of PET in PET/PP and PET/PE bicomponent fibers occurred at lower take-up velocities as compared to those in the single component spinning. On the other hand, PP in PET/PP fiber showed low orientation pseudo-hexagonal structure at all the take-up velocities investigated and the birefringence of PE in PET/PE fibers obtained at 6km/min was almost negligible, meaning fiber structure formation of PP and PE components was suppressed. On the contrary, in the PET/PS combination, structure formation of PET was suppressed and there was no indication of orientation-induced crystallization even at 7km/min. Oppositely, the molecular orientation of PS component was enhanced. The mechanism of the mutual interaction of two components on structure formation in the high-speed spinning of bicomponent fibers was speculated based on the characteristics of the constituent polymers, and it was concluded that the structure formation of a component having higher temperature-dependent elongational viscosity and higher solidification temperature is expected to be enhanced.