Influence of Branched Structures in Flexible Main Chain on the Properties of Impact Hardening Materials

doi:10.11944/j.issn.1000-0518.2019.10.190026

Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (10): 1155-1164.DOI: 10.11944/j.issn.1000-0518.2019.10.190026

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Influence of Branched Structures in Flexible Main Chain on the Properties of Impact Hardening Materials

DENG Yukun^a^b,LIANG Xuechen^a^b,PEI Xiaopeng^a^b,ZHAI Kankan^a^b,WANG Chao^a^b,ZHANG Baichao^a^b,BAI Yungang^a,ZHANG Wende^a,TAN Ying^a,WANG Pixin^a,XU Kun^a^*()

^aKey Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Chinese Acdemy of Sciences,Changchun 130022,China
^bUniversity of Chinese Academy of Sciences,Beijing 100049,China

Received:2019-01-25 Accepted:2019-05-06 Published:2019-10-01 Online:2019-09-29
Contact: XU Kun
Supported by:
Supported by the National Natural Science Foundation of China(No.51673191, No.21774124, No.U1762106), the Jilin Province Science and Technology Development Project(No.20180201071GX, No.201603101YY), the Special Funds for High Technology Industrialization of Scientific and Technological Cooperation Between Jilin and the Chinese Academy of Sciences(No.2018SYHZ0008), and the Basic Funds in Jilin Province's Budget(No.2019C049-10)

Abstract

Abstract:

Hydroxyl-terminated dimethylmethylvinyl(siloxane and polysiloxane) (C=C—PDMS—OH) was used as the graft branched chain to form a flexible main chain (Brush PDMS-OH) with bottle brushes by hydrogenation of H-PDMS with the caster catalyst. Brush impact hardening polymer (B-IHP) with branched chains was prepared by dynamic cross-linking of trimethoxyboroxyhexacyclic (TMOB) and stable chemical cross-linking by isophorone diisocyanate extender (IPDI). The structure and properties of the material were characterized by nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectrometer (FTIR) and rheometer. The results show that B-IHP has good mechanical properties and impact hardening properties. Its tensile strength can reach 9.8 MPa and impact hardening value can reach more than 3500. B-IHP has good self-healing performance, the healing efficiency can reach more than 95%, and the healing time is only 6 hours. The results show that the branched structure of flexible main chain can significantly reduce the relative molecular mass threshold of chain entanglement and improve the impact hardening and self-repairing ability of materials.

Key words: grafting, impact hardening, self-healing

DENG Yukun, LIANG Xuechen, PEI Xiaopeng, ZHAI Kankan, WANG Chao, ZHANG Baichao, BAI Yungang, ZHANG Wende, TAN Ying, WANG Pixin, XU Kun. Influence of Branched Structures in Flexible Main Chain on the Properties of Impact Hardening Materials[J]. Chinese Journal of Applied Chemistry, 2019, 36(10): 1155-1164.

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Influence of Branched Structures in Flexible Main Chain on the Properties of Impact Hardening Materials

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