Efficient Catalysis by Sodium Hypophosphite for Solid-State Polymerization of High-Viscosity PA6/66 Copolyamide: Kinetics, Process Optimization, and Industrial Application.

Feng Jiang, Chunxiao Yu, Zhiyu Hu, Yilan Wu, Xin Li

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Article in Polymers, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 authors.

Feng JiangState Key Laboratory of Advanced Fiber Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China.

Chunxiao YuState Key Laboratory of Advanced Fiber Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China.ORCID 0000-0003-1693-4863

Zhiyu HuState Key Laboratory of Bio-Based Fiber Materials, China Textile Academy, Beijing 100025, China.

Yilan WuState Key Laboratory of Advanced Fiber Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China.

Xin LiState Key Laboratory of Advanced Fiber Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China.

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6 · The paper itself

Abstract

The industrial preparation via solid-state polymerization (SSP) of high-viscosity copolyamides 6/66 (PA6/66) addresses the challenges, including prolonged reaction times, high energy consumption, and uneven viscosity distribution. In this study, sodium hypophosphite was introduced into the PA6/66 copolymerization system as a solid-state polymerization catalyst. The effects of this catalyst on the solid-state viscosity-increasing rate and relative viscosity were systematically investigated, and the extraction process was optimized to solve the loss of catalyst and controllable extractable content. The results showed that the relative viscosity of PA6/66 increased linearly with the SSP time, and the apparent viscosity increase rate could be stably maintained at 0.14 h

Indexed as

catalytic reactioncontrol concentrationPA6/66 copolyamidereaction kineticssolid state polymerization

Identifiers

PMID41682091

DOI10.3390/polym18030384

PMCPMC12899397

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