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Citation: 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. doi: 10.11944/j.issn.1000-0518.2019.10.190026 shu

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

  • a.

    Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Acdemy of Sciences, Changchun 130022, China

  • b.

    University of Chinese Academy of Sciences, Beijing 100049, China

  • Corresponding author: XU Kun, xukun@ciac.ac.cn
  • Received Date: 25 January 2019
    Revised Date: 25 February 2019
    Accepted Date: 6 May 2019

    Fund Project: the Jilin Province Science and Technology Development Project 20180201071GXSupported 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)the Jilin Province Science and Technology Development Project 201603101YYthe Basic Funds in Jilin Province′s Budget 2019C049-10the National Natural Science Foundation of China 51673191the Special Funds for High Technology Industrialization of Scientific and Technological Cooperation Between Jilin and the Chinese Academy of Sciences 2018SYHZ0008the National Natural Science Foundation of China U1762106the National Natural Science Foundation of China 21774124

Figures(8)

  • 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.
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