各向同性相中有机可溶氰基取代对芳纶低临界溶液温度行为的流变学研究

IF 2.2 4区 工程技术 Q2 MECHANICS
Hyo Jeong Kim, Yeamsuksawat Thanakorn, Dae Eon Jung, Youngho Eom
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引用次数: 0

摘要

聚(2-氰基对苯二甲酰对苯二胺)(CY-PPTA)因其在 N,N-二甲基乙酰胺/氯化锂(DMAc/LiCl)中的有机溶解性而备受关注,是一种很有前途的超级对位芳纶纤维前体,同时还能保持最终纤维的优异性能。然而,有报道称 CY-PPTA 由于氰基引起的强烈偶极-偶极相互作用而表现出异常的相行为。在此,我们对 CY-PPTA/DMAc 溶液随浓度和温度变化的各向同性相进行了流变学研究,并与 CY-PPTA/ 硫酸 (H2SO4) 溶液的各向同性相进行了比较。在各向同性区域,CY-PPTA 溶液在 DMAc 体系中产生的动态粘度(η')相对于浓度 6.0 的幂律指数(ηʹ ~ c6.0)高于 H2SO4 溶液(ηʹ ~ c3.2)。此外,随着温度的升高,CY-PPTA/DMAc 溶液表现出较低的临界溶液温度 (LCST),这与 H2SO4 中较高的临界溶液温度形成鲜明对比。因此,CY-PPTA/DMAc 溶液的粘度和指数在温度升高时会增加。如 Cole-Cole 图所示,DMAc 体系中的异质性变差。CY-PPTA 溶液的 LCST 可归因于高极性氰基之间的分子间相互作用,而这种作用在 H2SO4 中可以忽略不计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Rheological study on lower critical solution temperature behavior of organo-soluble cyano-substituted p-aramid in isotropic phase

Rheological study on lower critical solution temperature behavior of organo-soluble cyano-substituted p-aramid in isotropic phase

Rheological study on lower critical solution temperature behavior of organo-soluble cyano-substituted p-aramid in isotropic phase

Poly(2-cyano-p-phenylene terephthalamide) (CY-PPTA) has garnered significant interest as a promising precursor for super p-aramid fibers because of its organosolubility in N,N-dimethyl acetamide/lithium chloride (DMAc/LiCl) while conserving the superior properties of the resultant fibers. However, CY-PPTA has been reported to exhibit abnormal phase behavior owing to the strong dipole–dipole interactions induced by the cyano groups. Herein, we rheologically study the isotropic phases of CY-PPTA/DMAc solutions with respect to the concentration and temperature and compare them with those of CY-PPTA/sulfuric acid (H2SO4) solutions. In the isotropic region, the CY-PPTA solutions yield a higher power-law exponent of the dynamic viscosity (η') versus concentration of 6.0 (ηʹ ~ c6.0) in the DMAc system than that in H2SO4 (ηʹ ~ c3.2). Moreover, the CY-PPTA/DMAc solutions exhibit a lower critical solution temperature (LCST) behavior with increasing temperature, in contrast with the upper critical solution temperature in H2SO4. Consequently, the viscosity and exponent of the CY-PPTA/DMAc solutions increase at elevated temperatures. As shown by the Cole–Cole plot, the heterogeneity in the DMAc system becomes worse. The LCST of the CY-PPTA solution is ascribed to the intermolecular interactions between the highly polar cyano groups, which are negligible in H2SO4.

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来源期刊
Korea-Australia Rheology Journal
Korea-Australia Rheology Journal 工程技术-高分子科学
CiteScore
2.80
自引率
0.00%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Korea-Australia Rheology Journal is devoted to fundamental and applied research with immediate or potential value in rheology, covering the science of the deformation and flow of materials. Emphases are placed on experimental and numerical advances in the areas of complex fluids. The journal offers insight into characterization and understanding of technologically important materials with a wide range of practical applications.
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