Effects of the coagulation temperature on the properties of wet-spun poly(vinyl alcohol)-graphene oxide fibers
Effects of the coagulation temperature on the properties of wet-spun poly(vinyl alcohol)-graphene oxide fibers
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凝固温度对湿法纺聚乙烯醇-氧化石墨烯纤维性能的影响
DOI：
10.1002/app.45463
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发表时间：
2017
影响因子：
3
通讯作者：
Li Huiyan
中科院分区：
文献类型：
--
作者：
Hu Chengming;Li Jinlei;Liu Dagang;Song Renjie;Gu Jiefan;Prempeh Nana;Li Huiyan
氧化石墨烯（GO）作为正增强填料分散到聚乙烯醇（PVA）涂料中，湿纺成复合纤维。研究了分别在- 5℃和25℃两种温度下的EtOH混凝液对复合纤维形态、结构和力学性能的影响。结果表明：在- 5℃下进行凝胶纺丝，纤维的收缩率较大，纤维直径较细，孔隙率较低；同时，较低的混凝温度也极大地促进了氧化石墨烯薄片液晶相的形成和保存，减少了PVA结晶区的中断。结果表明，在- 5℃下纺丝的纤维韧性和断裂伸长率均高于在25℃下经凝固浴纺丝的纤维。特别是，在所有湿纺复合纤维中，1 wt %的氧化石墨烯表现出最高的增强效果。因此，在低温下控制胶凝-脱混过程，将为定制具有优异机械性能的功能性产业用纺织品提供更有指导意义的见解。©2017 Wiley期刊公司j:。变异较大。Sci.2017、134、45463。
Graphene oxide (GO) as a positive reinforcement filler was dispersed into a poly(vinyl alcohol) (PVA) dope and wet‐spun into composite fibers. The effects of two EtOH coagulation baths maintained at −5 and 25 °C, respectively, on the morphology, structure, and mechanical properties of the composite fibers were investigated. The results show that gel spinning at −5 °C led to a relatively large shrinkage ratio, thin diameter, and low porosity of the as‐spun fibers. Simultaneously, the low coagulation temperature also greatly contributed to the formation and preservation of the liquid‐crystalline phase of the GO sheets and interrupted the crystalline zone of PVA less. As a result, either the tenacity or the elongation at break of the fibers spun at −5 °C was higher than those of the fibers spun through a coagulation bath at 25 °C. In particular, 1 wt % GO showed the highest reinforcement effects among all of the wet‐spun composite fibers. Hence, controlling the gelling–demixing process at a low temperature will provide more instructive insights for tailoring functional industrial textiles with excellent mechanical properties. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2017,134, 45463.