Design and mechanical properties of supramolecular polymeric materials based on host–guest interactions: the relation between relaxation time and fracture energy,Polymer Chemistry

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Design and mechanical properties of supramolecular polymeric materials based on host–guest interactions: the relation between relaxation time and fracture energy
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-10-02 , DOI: 10.1039/d0py01347a
Subaru Konishi _{1,

2,

3,

4,

5} , Yu Kashiwagi _{1,

2,

3,

4,

5} , Go Watanabe _{5,

6,

7,

8,

9} , Motofumi Osaki _{1,

2,

3,

4,

5} , Takuya Katashima _{5,

10,

11,

12,

13} , Osamu Urakawa _{1,

2,

3,

4,

5} , Tadashi Inoue _{1,

2,

3,

4,

5} , Hiroyasu Yamaguchi _{1,

2,

3,

4,

5} , Akira Harada _{3,

5,

14,

15} , Yoshinori Takashima _{1,

2,

3,

4,

5}

Affiliation

Functional polymeric materials based on reversible noncovalent bonds have attracted much attention due to their mechanical and responsive properties. In particular, the association/dissociation of the reversible bond is widely known to improve the fracture energy of polymeric materials. Herein, we aimed to establish a general strategy for designing tough materials and investigated the relation between the lifetime of reversible bonds and the toughness of the material. We experimentally demonstrated the fracture energy in relation to the viscoelastic relaxation time (τ) of the reversible bonds and the observation time scale. We prepared supramolecular hydrogels cross-linked by inclusion complexes between α-cyclodextrin (αCD) and alkyl chains modified with cation units. τ varied widely in response to the kinetics of the threading/dethreading of the αCD unit. The viscoelastic behaviour of the reversible cross-linking points, which could be tuned by τ and the tensile rate, improved the fracture energy of the supramolecular hydrogels.

中文翻译：

基于主体-客体相互作用的超分子聚合物材料的设计和力学性能：弛豫时间与断裂能之间的关系

基于可逆非共价键的功能性聚合物材料因其机械和响应特性而备受关注。特别地，众所周知可逆键的缔合/解离可改善聚合物材料的断裂能。在此，我们旨在建立一种设计韧性材料的通用策略，并研究可逆键的寿命与材料韧性之间的关系。我们通过实验证明了断裂能与可逆键的粘弹性弛豫时间（τ）和观察时间尺度有关。我们制备了通过α-环糊精（αCD）和阳离子单元修饰的烷基链之间的包合物形成交联的超分子水凝胶。τ随αCD单元穿线/脱线的动力学而变化很大。可通过τ和拉伸速率调节可逆交联点的粘弹性行为，改善了超分子水凝胶的断裂能。

更新日期：2020-11-03

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