Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (6): 20220066.doi: 10.7503/cjcu20220066

• Polymer Chemistry • Previous Articles     Next Articles

Synthesis and Application of Modified Low Molecular Weight Polyisoprene

YAN Zhixuan1,2, MA Ji1, QU Jinlei1, LIU Li1, SUN Chong2, LIU Jiwen2, LIU Guangye1, SUN Lishui1, HE Lixia1()   

  1. 1.Engineering Research Center for High Performance Polymers and Molding Technology,Ministry of Education
    2.College of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China
  • Received:2022-01-25 Online:2022-06-10 Published:2022-04-14
  • Contact: HE Lixia E-mail:lixiahe2006@126.com
  • Supported by:
    the National Natural Science Foundation of China(51972185)

Abstract:

Low molecular weight 3,4-polyisoprene(LPI) was prepared by anionic solution polymerization and then it was modified to prepare siloxane modified functionalized low molecular weight 3,4-polyisoprene(MLPI), including three end group-modified materials, LPI-propyl methyldimethoxysilane(LPI-CMDS), LPI-propyl trimethoxysilane(LPI-CTMS), LPI-propyl trimethoxysilane(LPI-CTES) and one graft-modified material, 3-mercaptopropyl triethoxy silane graft modification LPI(LPI-g-MTS). The influences of LPI and MLPI on dispersion of silica and properties of solution polymerized styrene butadiene rubber(SSBR) composites were studied. Improvement of interaction between the filler and the polymer and dispersion of silica in the composites was domenstrated by strain scanning and bound rubber content results. Due to the more active sites, LPI-g-MTS had the best effect. Compared to the unmodified LPI filled composite, the physical and mechanical properties of the LPI-g-MTS filled composites increased, especially the modulus at 300% elongation increased by 89.66% and the tensile strength increased by 27.15%. This work provides a new method to improve the dispersion of silica in rubber/silica composites.

Key words: End group modification, Graft modification, Polyisoprene, Silica

CLC Number: 

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