Viscoelastic Property Evolution of Thermoplastic Polyurethane During Annealing Treatment and Its Correlation with Segmental Crystallization

Jian-Wen Shan; Yan-Bo Zhu; Ling-Ling Ni; Peng-Ju Pan

doi:10.1007/s10118-024-3219-0

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Viscoelastic Property Evolution of Thermoplastic Polyurethane During Annealing Treatment and Its Correlation with Segmental Crystallization

RESEARCH ARTICLE | Updated：2024-12-03

- Viscoelastic Property Evolution of Thermoplastic Polyurethane During Annealing Treatment and Its Correlation with Segmental Crystallization
- Chinese Journal of Polymer Science Vol. 42, Issue 12, Pages: 1976-1985(2024)
- Affiliations：
  
  a.State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China
  b.Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, China
- Author bio：
  
  linglingni@zju.edu.cn (L.L.N.)
  panpengju@zju.edu.cn (P.J.P.)
- Funds：
- DOI：10.1007/s10118-024-3219-0
  CLC：
- Received：09 May 2024，
  
  Revised：2024-07-26，
  
  Accepted：12 August 2024，
  
  Online First：07 November 2024，
  
  Published：01 December 2024
- Accepted：
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Shan, J. W.; Zhu, Y. B.; Ni, L. L.; Pan, P. J. Viscoelastic property evolution of thermoplastic polyurethane during annealing treatment and its correlation with segmental crystallization. Chinese J. Polym. Sci. 2024, 42, 1976–1985

Jian-Wen Shan, Yan-Bo Zhu, Ling-Ling Ni, et al. Viscoelastic Property Evolution of Thermoplastic Polyurethane During Annealing Treatment and Its Correlation with Segmental Crystallization[J]. Chinese Journal of Polymer Science, 2024, 42(12): 1976-1985.
Shan, J. W.; Zhu, Y. B.; Ni, L. L.; Pan, P. J. Viscoelastic property evolution of thermoplastic polyurethane during annealing treatment and its correlation with segmental crystallization. Chinese J. Polym. Sci. 2024, 42, 1976–1985 DOI： 10.1007/s10118-024-3219-0.

Jian-Wen Shan, Yan-Bo Zhu, Ling-Ling Ni, et al. Viscoelastic Property Evolution of Thermoplastic Polyurethane During Annealing Treatment and Its Correlation with Segmental Crystallization[J]. Chinese Journal of Polymer Science, 2024, 42(12): 1976-1985. DOI： 10.1007/s10118-024-3219-0.

摘要

We prepared thermoplastic polyurethane (TPU) from polycaprolactone diol

diphenylmethane-4

4-diisocyanate

and 1

4-butanediol. The viscoelastic behaviors of three TPUs with different hard segment content during thermal annealing process are investigated. The results obtained in this study would be crucial for the processing of TPU materials.

Abstract

Viscoelastic properties of thermoplastic polyurethane (TPU) is of fundamental importance for its processing. In this work

we prepared different TPUs from polycaprolactone (PCL) diol

diphenylmethane-4

4′-diisocyanate (MDI)

and 1

4-butanediol (BDO)

and investigated the viscoelastic behavior of three TPUs with different hard segment content during thermal annealing process. The storage modulus (

′) of TPU increases over time in a medium annealing temperature (

) region

but remains unchanged at both high and low temperature regions. The growth of loss modulus (

″) over time is slower than that of

′. At medium

both

′ and

″ increase during the repeating frequency (

) sweep

due to the gradual crystallization of hard segments. This indicates that the crystallites primarily restrain the relaxation of unit with large size. The increments of

′ and

″ are weakened when the content of hard segment in TPU is decreased. For TPU with high content of hard segments

a complete high elastic platform with a width of 3 orders of magnitude was observed only through one frequency scan test at medium

. In addition

the crystallites of hard segments grow up continuously during frequency scan test (isothermal annealing treatment) and cause the extreme increase in

′ and

″ with

in low

region.

关键词

Keywords

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