In situ gradient nano-scale fibril formation during polypropylene (PP)/polystyrene (PS) composite fine fiber processing
In situ gradient nano-scale fibril formation during polypropylene (PP)/polystyrene (PS) composite fine fiber processing
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DOI：
10.1016/j.polymer.2005.03.100
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发表时间：
2005-06
期刊：
影响因子：
4.6
通讯作者：
Q. Xing;Meifang Zhu;Y. Wang;Yanmo Chen;Yu Zhang;J. Pionteck;H. Adler
中科院分区：
文献类型：
--
作者：
Q. Xing;Meifang Zhu;Y. Wang;Yanmo Chen;Yu Zhang;J. Pionteck;H. Adler
采用原位生成法研究了PP/PS复合超细纤维中纳米级分散纤丝的形成过程，发现纳米级纤丝在PP/PS复合纤维中呈梯度分布。研究了PS含量为2 ~ 8wt%的共混物从颗粒到初生纤维以及拉伸纤维的形态发展。当PS含量为4wt%时，PS分散相沿初生复合纤维径向由椭圆形向沿着梯度分布的纳米纤丝形态转变，表明纤维中心存在断裂和有限的聚结，尤其是在8wt%的PS初生复合纤维中。这种形态的多样性是由于径向变化的参数，包括温度，粘度，轴向速度和应力的纺丝路径，并在良好的协议与液滴变形标准的基础上减少毛细管数。此外，后热拉伸工艺对复合拉伸纤维中PS相的尺寸和分布影响不大，而PP、PS和共混物的流变性能与PP/PS复合材料的形态结构密切相关。
The nano-scale dispersed fibrils with gradient distribution in PP/PS composite fine fibers were observed by in situ formation during its melt spinning process. The morphology development of polyblends, from granule to as-spun fiber as well as drawn fiber with various PS content from 2 to 8wt% were investigated. The morphology conversion of PS dispersed phase from ellipse to gradient nano-scale fibril along the radial direction of as-spun composite fibers took palace at 4wt% by weight of PS component, suggesting the presence of break-up in fiber center and the limited coalescence, especially in 8wt% PS as-spun composite fibers. This morphology diversity was attributed to the radial variation of parameters including temperature, viscosity, axial velocity and stress in spinning path and was in good agreement with the droplet deformation criteria based on the reduced capillary number. In addition, the post hot-drawing process slightly influence the size and distribution of PS phase in cross-section of composite drawn fibers, while the rheological properties of PP, PS and polyblends were found to be correlated to the morphology of PP/PS composites.