Direct Solid State Polymerization and Structural Properties of High Heat Resistant Copolyamide PA56T

Yun Fang; Lei Wang; Yi Sun; Kan Cheng; Tao Liu; Xue-li Wang; Jian-yong Yu; Yong He

doi:10.11777/j.issn1000-3304.2025.25017

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Direct Solid State Polymerization and Structural Properties of High Heat Resistant Copolyamide PA56T

Research Article | 更新时间：2025-07-08

- Direct Solid State Polymerization and Structural Properties of High Heat Resistant Copolyamide PA56T
- Acta Polymerica Sinica Vol. 56, Issue 7, Pages: 1192-1202(2025)
- 作者机构：
  
  1.东华大学，材料科学与工程学院先进纤维材料全国重点实验室，上海 201620
  2.东华大学，纺织科技创新中心，上海 201620
- 作者简介：
  
  Yong He, E-mail: yhe@dhu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25017
  CLC：
- CSTR：32057.14.GFZXB.2025.7374
- Received：10 January 2025，
  
  Accepted：05 March 2025，
  
  Published Online：18 April 2025，
  
  Published：20 July 2025
- 稿件说明：
移动端阅览
方赟, 王磊, 孙一, 程刊, 刘涛, 王学利, 俞建勇, 何勇. 高耐热共聚酰胺PA56T的直接固相聚合及结构性能研究. 高分子学报, 2025, 56(7), 1192-1202

Fang, Y., Wang, L., Sun, Y., Cheng, K., Liu, T., Wang, X. L., Yu, J. Y., He, Y. Direct solid state polymerization and structural properties of high heat resistant copolyamide PA56T. Acta Polymerica Sinica, 2025, 56(7), 1192-1202
方赟, 王磊, 孙一, 程刊, 刘涛, 王学利, 俞建勇, 何勇. 高耐热共聚酰胺PA56T的直接固相聚合及结构性能研究. 高分子学报, 2025, 56(7), 1192-1202 DOI： 10.11777/j.issn1000-3304.2025.25017. CSTR： 32057.14.GFZXB.2025.7374.

Fang, Y., Wang, L., Sun, Y., Cheng, K., Liu, T., Wang, X. L., Yu, J. Y., He, Y. Direct solid state polymerization and structural properties of high heat resistant copolyamide PA56T. Acta Polymerica Sinica, 2025, 56(7), 1192-1202 DOI： 10.11777/j.issn1000-3304.2025.25017. CSTR： 32057.14.GFZXB.2025.7374.

摘要

针对高耐热聚酰胺直接固相聚合(DSSP)中易出现二胺挥发、产率低以及分子量难于提升等问题，首先用对苯二甲酸二甲酯(DMT)分别和过量1

5-戊二胺(PDA)、1

6-己二胺(HMDA)酰胺化制备二酰胺二胺5T5和6T6，再以5T5、6T6与对苯二甲酸(PTA)成盐得到不同组成的5T5T/6T6T混合盐，最后采用直接固相聚合由混合盐成功制备了系列高黏高耐热共聚酰胺PA56T，并对其结构性能进行了研究，结果表明：采用二酰胺二胺的酰胺盐可以有效避免以往直接固相聚合过程中的二胺挥发，从而大幅提高耐热共聚酰胺的产率、分子量以及品质；改变组成可以有效调控共聚酰胺PA56T的综合性能，其熔点

随着6T含量的增加先降低后增加；共聚提升了耐热聚酰胺的热稳定性；6T含量40 mol%的共聚酰胺PA56T-40具有良好的综合性能，其熔点

、5 wt%失重温度

和拉伸强度分别高达310 ℃、440 ℃和95.2 MPa.

Abstract

To address the issues of diamine volatilization

low yield

and difficulty in increasing molecular weight during the direct solid state polymerization (DSSP) of high-temperature-resistant polyamides

this study first used dimethyl terephthalate (DMT) to react with excess 1

5-pentanediamine (PDA) and 1

6-hexanediamine (HMDA) to prepare diamides diamines 5T5 and 6T6. Then

5T5 and 6T6 were reacted with terephthalic acid (PTA) to form different compositions of 5T5T/6T6T mixed salts. Finally

a series of high-viscosity

high-temperature-resistant copolyamides PA56T were successfully synthesized through direct solid state p

olymerization from the mixed salts. The structure and properties of PA56T were systematically investigated using FTIR

NMR

DSC

and TGA. The results indicate that using diamides diamines as amide salts can effectively prevent the volatilization of diamines during the direct solid-state polymerization process

thereby significantly improving the yield

molecular weight

and quality of the high-temperature-resistant copolyamides. By changing the composition

the comprehensive properties of the copolyamide PA56T can be effectively regulated. Its melting point (

) first decreases and then increases with the increase in 6T content. Copolymerization enhances the thermal stability of the high-temperature-resistant polyamides. The copolymer PA56T-40

with 40 mol% 6T content exhibits excellent comprehensive properties

with a melting point (

) of 310 ℃

a 5 wt% weight loss temperature (

) of 440 ℃

and a tensile strength of 95.2 MPa.

关键词

Keywords

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Related Institution

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