Study on Phase Transition and Shear Rheology of Concentrated Sulfuric Acid Solution of Poly(<italic style="font-style: italic">p</italic>-phenylene terephthalamide)

ZHAO Ming; TANG Kai; LUO Rui-yin; LI Jing-jin; MA Qian-li; LIU Geng-xin; TENG Cui-qing

doi:10.14028/j.cnki.1003-3726.2025.25.072

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Study on Phase Transition and Shear Rheology of Concentrated Sulfuric Acid Solution of Poly(p-phenylene terephthalamide)

更新时间：2025-07-15

- Study on Phase Transition and Shear Rheology of Concentrated Sulfuric Acid Solution of Poly(p-phenylene terephthalamide)
- Polymer Bulletin Vol. 38, Issue 8, Pages: 1291-1298(2025)
- 作者机构：
  
  1.东华大学先进纤维材料全国重点实验室，先进低维材料中心，材料科学与工程学院，上海 201620
  2.宁夏泰和芳纶纤维有限责任公司，银川 750411
  3.泰和新材集团股份有限公司，烟台 264006
  4.东华大学先进纤维材料全国重点实验室，材料科学与工程学院，上海 201620
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2025.25.072
  CLC：
- Received：05 March 2025，
  
  Accepted：04 May 2025，
  
  Published Online：26 June 2025，
  
  Published：20 August 2025
- 稿件说明：
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赵鸣, 唐凯, 雒瑞银, 李京津, 马千里, 刘庚鑫, 滕翠青. 聚对苯二甲酰对苯二胺浓硫酸溶液的相转变与剪切流变研究. 高分子通报, 2025, 38(8), 1291–1298.

Zhao, M.; Tang, K.; Luo, R. Y.; Li, J. J.; Ma, Q, L.; Liu, G. X.; Teng, C. Q. Study on phase transition and shear rheology of concentrated sulfuric acid solution of poly(p-phenylene terephthalamide). Polym. Bull. (in Chinese), 2025, 38(8), 1291–1298.
赵鸣, 唐凯, 雒瑞银, 李京津, 马千里, 刘庚鑫, 滕翠青. 聚对苯二甲酰对苯二胺浓硫酸溶液的相转变与剪切流变研究. 高分子通报, 2025, 38(8), 1291–1298. DOI： 10.14028/j.cnki.1003-3726.2025.25.072.

Zhao, M.; Tang, K.; Luo, R. Y.; Li, J. J.; Ma, Q, L.; Liu, G. X.; Teng, C. Q. Study on phase transition and shear rheology of concentrated sulfuric acid solution of poly(p-phenylene terephthalamide). Polym. Bull. (in Chinese), 2025, 38(8), 1291–1298. DOI： 10.14028/j.cnki.1003-3726.2025.25.072.

摘要

聚对苯二甲酰对苯二胺(PPTA)能溶于浓硫酸(H

)，在一定的温度和浓度范围内呈现液晶相，可以经干喷湿法工艺纺丝制得对位芳纶。PPTA/H

溶液的相行为和流变行为是决定对位芳纶加工工艺和性能的关键因素，但是缺乏便捷的研究工具。本研究为旋转流变仪设计并制作了能够耐受浓硫酸的平行板夹具，揭示不同分子量PPTA/H

溶液的相转变和剪切流变行为。通过偏光显微镜观察PPTA/H

溶液的液晶织构，结合流变的线性黏弹性，确定相转变温度和边界。通过流变的振荡扫描以及稳态剪切，探索温度、质量分数和PPTA分子量与溶液的储能模量、松弛时间和黏度的关系。结果表明：更高浓度的PPTA/H

溶液具有更宽的向列相(N)的温度范围，并且相转变临界温度也更高；模量、松弛时间和黏度随着浓度增加呈现非单调的变化；高浓度溶液在稳态剪切中表现出非线性流变行为。进一步理解PPTA/H

溶液的相转变条件以及剪切流变行为，将会对对位芳纶纺丝工艺参数的指导与改进有着重要意义。

Abstract

Poly(

-phenylene terephthalamide) (PPTA) can be dissolved in concentrated sulfuric acid (H

) and exhibits a liquid crystalline phase within a certain temperature and concentration range. It can be spun into para-aramid fibers through the dry-jet wet spinning process. The phase behavior and rheological behavior of PPTA/H

solutions are key factors determining the processing technology and performance of para-aramid fibers. However

there is a lack of convenient research tools. In this paper

a parallel plate fixture resistant to concentrated sulfuric acid was designed and fabricated for a rotational rheometer to reveal the phase transition and shear rheological behavior of PPTA/H

solutions with different molecular weights. The liquid crystalline texture of PPTA/H

solutions was observed by polarizing microscopy

and the phase transition temperature and boundaries were determined in combination with the linear viscoelasticity of rheology. The relationship between temperature

mass fraction

PPTA molecular weight and the storage modulus

relaxation time and viscosity of the solution was explored through rheological oscillation scanning and steady shear. The results show that higher concentration PPTA/H

solutions have a wider temperature range of the nematic phase (N) and a higher critical temperature for phase transition; the modulus

relaxation time and viscosity show non-monotonic changes with increasing concentration; high concentration solutions exhibit nonlinear rheological behavior in steady shear. A f

urther understanding of the phase transition conditions and shear rheological behavior of PPTA/H

solutions will be of great significance for guiding and improving the spinning process parameters of para-aramid fibers.

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Study on Phase Transition and Shear Rheology of Concentrated Sulfuric Acid Solution of Poly(p-phenylene terephthalamide)

DOI：10.14028/j.cnki.1003-3726.2025.25.072

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