Dynamic Bonds Mediate <italic style="font-style: italic">π</italic>-<italic style="font-style: italic">π</italic> Interaction <italic style="font-style: italic">via</italic> Phase Locking Effect for Enhanced Heat Resistant Thermoplastic Polyurethane

Yue Lai; Xiao Kuang; Wen-Hong Yang; Yu Wang; Ping Zhu; Jing-Pu Li; Xia Dong; Du-Jin Wang

doi:10.1007/s10118-020-2494-7

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Dynamic Bonds Mediate π-π Interaction via Phase Locking Effect for Enhanced Heat Resistant Thermoplastic Polyurethane

ARTICLE | Updated：2020-10-10

- Dynamic Bonds Mediate π-π Interaction via Phase Locking Effect for Enhanced Heat Resistant Thermoplastic Polyurethane
- Dynamic Bonds Mediate π-π Interaction via Phase Locking Effect for Enhanced Heat Resistant Thermoplastic Polyurethane
- Chinese Journal of Polymer Science 2021年39卷第2期页码：154-163
- Affiliations：
  
  a.CAS Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  b.University of Chinese Academy of Sciences, Beijing 100049, China
  c.The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
  d.College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
- Author bio：
  
  xiadong@iccas.ac.cn
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (No. 21774135).
- DOI：10.1007/s10118-020-2494-7
  中图分类号：
- 收稿：2020-06-10，
  
  修回：2020-7-26，
  
  录用：2020-8-10，
  
  网络首发：2020-10-10，
  
  纸质出版：2021-01-02
- Accepted：
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Lai, Y.; Kuang, X.; Yang, W. H.; Wang, Y.; Zhu, P.; Li, J. P.; Dong, X.; Wang, D. J. Dynamic bonds mediate , π,-, π, interaction , via, phase locking effect for enhanced heat resistant thermoplastic polyurethane. Chinese J. Polym. Sci. 2021, 39, 154–163

Yue Lai, Xiao Kuang, Wen-Hong Yang, et al. Dynamic Bonds Mediate π-π Interaction via Phase Locking Effect for Enhanced Heat Resistant Thermoplastic Polyurethane[J]. Chinese Journal of Polymer Science, 2021, 39(2): 154-163. DOI: 10.1007/s10118-020-2494-7.
Lai, Y.; Kuang, X.; Yang, W. H.; Wang, Y.; Zhu, P.; Li, J. P.; Dong, X.; Wang, D. J. Dynamic bonds mediate , π,-, π, interaction , via, phase locking effect for enhanced heat resistant thermoplastic polyurethane. Chinese J. Polym. Sci. 2021, 39, 154–163 DOI： 10.1007/s10118-020-2494-7.

Yue Lai, Xiao Kuang, Wen-Hong Yang, et al. Dynamic Bonds Mediate π-π Interaction via Phase Locking Effect for Enhanced Heat Resistant Thermoplastic Polyurethane[J]. Chinese Journal of Polymer Science, 2021, 39(2): 154-163. DOI: 10.1007/s10118-020-2494-7. DOI：

摘要

Abstract

Stimulus-responsive polymers containing dynamic bonds enable fascinating properties of self-healing

recycling and reprocessing due to enhanced relaxation of polymer chain/network with labile linkages. Here

we study the structure and properties of a new type of thermoplastic polyurethanes (TPUs) with trapped dynamic covalent bonds in the hard-phase domain and report the frustrated relaxation of TPUs containing weak dynamic bond and

interaction in hard segments. As detected by rheometry

the aromatic TPUs with alkyl disulfide in the hard segments possess the maximum network relaxation time in contrast to those without dynamic bonds and alicyclic TPUs.

In situ

FTIR and small-angle scattering results reveal that the alkyl disulfide facilitates stronger intermolecular interaction and more stable micro-phase morphology in

interaction based aromatic TPUs. Molecular dynamics simulation for pure hard segments of model molecules verify that the presence of disulfide bonds leads to stronger

stacking of aromatic rings due to both enhanced assembling thermodynamics and kinetics. The enhanced

packing and micro-phase structure in TPUs further kinetically immobilize the dynamic bond. This kinetically interlocking between the weak dynamic bonds and strong molecular interaction in hard segments leads to much slower network relaxation of TPU. This work provides a new insight in tuning the network relaxation and heat resistance as well as molecular self-assembly in stimulus-responsive dynamic polymers by both molecular design and micro-phase control toward the functional applications of advanced materials.

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references

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Dynamic Bonds Mediate π-π Interaction via Phase Locking Effect for Enhanced Heat Resistant Thermoplastic Polyurethane

Dynamic Bonds Mediate π-π Interaction via Phase Locking Effect for Enhanced Heat Resistant Thermoplastic Polyurethane

DOI：10.1007/s10118-020-2494-7

摘要

Abstract

关键词

Keywords

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