Structure and properties of fiber-reinforced polypropylene prepared by direct incorporation of aqueous solution of poly(vinyl alcohol)
Structure and properties of fiber-reinforced polypropylene prepared by direct incorporation of aqueous solution of poly(vinyl alcohol)
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DOI：
10.1016/j.polymer.2020.122566
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发表时间：
2020-06-11
期刊：
影响因子：
4.6
通讯作者：
Yamaguchi, Masayuki
中科院分区：
文献类型：
--
作者：
Nishikawa, Riho;Aridome, Norifumi;Yamaguchi, Masayuki
聚（乙烯醇）（PVA）与大多数常规塑料不混溶，并且由于其广泛的氢键作用而不适合熔融加工。因此，关于PVA与标准塑料的熔融混合的研究很少。本文介绍了一种新的生产含PVA纤维的等规聚丙烯（PP）复合材料的方法，即在宽排气口的双螺杆挤出机中，将PVA水溶液从喷嘴直接引入到熔融PP中。结果表明，PVA纤维在复合材料中分散均匀。此外，由该复合材料制成的注塑产品表现出增加的模量、高屈服强度和高热变形温度。这些性能归因于PP链和PVA纤维的显著取向程度。在流动方向上取向的PVA纤维的成核作用是负责复合材料的结构，这反过来又导致有吸引力的性能。
Poly (vinyl alcohol) (PVA) is immiscible with most conventional plastics and also unsuitable for melt processing owing to its extensive hydrogen bonding. Therefore, there have been few studies concerning the melt-mixing of PVA with standard plastics. The present paper describes a novel technique for producing isotactic polypropylene (PP) composites containing PVA fibers by directly introducing an aqueous solution of PVA into molten PP from an injection nozzle in a twin-screw extruder having a wide venting port. The PVA fibers were found to be dispersed homogeneously in the composites obtained by this method. Furthermore, an injection-molded product made from this composite exhibited an increased modulus, high yield strength, and high heat distortion temperature. These properties are attributed to the significant degree of orientation of both the PP chains and the PVA fibers. The nucleating action of the PVA fibers oriented in the flow direction is responsible for the structure of the composite, which in turn results in attractive properties.