Study on the Speed-induced Extensibility Behavior and Mechanism of Double Soft Phase Thermoplastic Elastomers

Cheng-yi Huang; Kai Lu; Yi-yu Kang; Hai-ming Chen

doi:10.11777/j.issn1000-3304.2025.25266

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Study on the Speed-induced Extensibility Behavior and Mechanism of Double Soft Phase Thermoplastic Elastomers

Research Article | 更新时间：2026-04-01

- Study on the Speed-induced Extensibility Behavior and Mechanism of Double Soft Phase Thermoplastic Elastomers
- Acta Polymerica Sinica Vol. 57, Issue 4, Pages: 939-950(2026)
- 作者机构：
  
  1.宁波大学材料科学与化学工程学院宁波 315211
  2.中国科学院宁波材料技术与工程研究所高分子与复合材料实验室宁波 315201
  3.南京玻璃纤维研究设计院有限公司南京 210012
- 作者简介：
  
  Yi-yu Kang, E-mail: kangyiyu@fiberglasschina.com
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25266
  CLC：
- CSTR：32057.14.GFZXB.2025.7541
- Received：29 November 2025，
  
  Accepted：24 December 2025，
  
  Online First：28 January 2026，
  
  Published：20 April 2026
- 稿件说明：
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黄呈溢, 陆凯, 康宜宇, 陈海明. 双软相热塑性弹性体的速率诱导延伸行为与机理研究. 高分子学报, 2026, 57(4), 939-950.

Huang, C. Y.; Lu, K; Kang, Y. Y.; Chen, H. M. Study on the speed-induced extensibility behavior and mechanism of double soft phase thermoplastic elastomers. Acta Polymerica Sinica (in Chinese), 2026, 57(4), 939-950.
黄呈溢, 陆凯, 康宜宇, 陈海明. 双软相热塑性弹性体的速率诱导延伸行为与机理研究. 高分子学报, 2026, 57(4), 939-950. DOI： 10.11777/j.issn1000-3304.2025.25266. CSTR： 32057.14.GFZXB.2025.7541.

Huang, C. Y.; Lu, K; Kang, Y. Y.; Chen, H. M. Study on the speed-induced extensibility behavior and mechanism of double soft phase thermoplastic elastomers. Acta Polymerica Sinica (in Chinese), 2026, 57(4), 939-950. DOI： 10.11777/j.issn1000-3304.2025.25266. CSTR： 32057.14.GFZXB.2025.7541.

摘要

通过调控热塑性弹性体的黏弹性而获得特殊力学特征的速率诱导延伸(speed induced extensibility，SIE)行为(即弹性体的模量、强度和断裂伸长率同时随拉伸速率增大而增加)，是一个有趣的科学现象. 在本研究中，选择热力学不相容且均为双羟基封端的聚二甲基硅氧烷和聚四氢呋喃作为软段，通过调控硬段含量，构筑了具有双软相结构的系列热塑性聚氨酯弹性体，实现了SIE行为的可调、可控制备. 基于原位小角X射线散射(

in situ

small angle X-ray scattering，SAXS)技术对其形变过程中的结构演化行为原位追踪，认为双软相结构在形变过程中的界面弥散、融合过程会极大地延长分子链的松弛时间，进而促进分子链大规模滑移，形成显著的速率诱导延伸行为.该过程的确认对理解热塑性弹性体在长程形变过程中的微观结构演化提供了新的视角，将为设计新型高性能弹性体提供指导.

Abstract

Regulating the viscoelasticity of thermoplastic elastomers (TPE) to achieve speed-induced extensibility (SIE) behavior

where the modulus

strength

and elongation at break increase simultaneously with increasing tensile rate

is an intriguing scientific issue. In this study

dihydroxyl-terminated poly(dimethylsiloxane) (PDMS) and poly(tetrahydrofuran) (PTMEG)

which are thermodynamically incompatible

were selected as soft segments. By adjusting the hard segment content

a series of thermoplastic polyurethane (TPU) elastomers with a dual soft-phase structure were constructed.

In situ

small-angle X-ray scattering (

in situ

SAXS) was employed to track the structural evolution of these elastomers during deformation. It was proposed that the interface diffusion and mixing of the dual soft-phase significantly prolong the relaxation time of chains

thereby promoting large-scale chain slippage

leading to distinct SIE behavior. The confirmation of this process provides a new perspective for understanding the microstructural evolution of TPE during long-range deformation and will offer guidance for the design of novel high-performance elastomers.

关键词

Keywords

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