文章摘要
Microstructure Analysis of Different Grades of CR
Received:March 29, 2024  Revised:March 29, 2024
DOI：10.12136/j.issn.1000-890X.2026.04.0298
Key Words: CR；structure unit content；molecular weight；Mooney viscosity；glass transition temperature；gel content
Author NameAffiliationE-mail
LI Xiangyu School of Polymer Science and Engineering/Key Laboratory of Rubber-Plastics of Ministry of Education Qingdao University of Science and Technology Qingdao 953305386@qq.com 
GUO Yujie School of Polymer Science and Engineering/Key Laboratory of Rubber-Plastics of Ministry of Education Qingdao University of Science and Technology Qingdao  
WAN Lin School of Polymer Science and Engineering/Key Laboratory of Rubber-Plastics of Ministry of Education Qingdao University of Science and Technology Qingdao  
LIU Yingjun School of Polymer Science and Engineering/Key Laboratory of Rubber-Plastics of Ministry of Education Qingdao University of Science and Technology Qingdao  
DU Aihua* School of Polymer Science and Engineering/Key Laboratory of Rubber-Plastics of Ministry of Education Qingdao University of Science and Technology Qingdao 1299712382@qq.com 
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Abstract:
      The microstructures of four grades of chloroprene rubber（CR） at home and abroad （imported S40V and domestic SN212，SN232，213-2） were studied and compared by means of nuclear magnetic resonance hydrogen spectrum，gel permeation chromatography，differential scanning calorimetry and other analysis methods.The molecular structure unit contents，molecular weights and their distribution，Mooney viscosities，plasticities and glass transition temperatures of CR were systematically characterized.The results showed that，the molecular structure unit contents of S40V were close to those of 213-2.S40V had larger weight average molecular weight and wider molecular weight distribution，lower Mooney viscosity，and better plasticity.SN212 and 213-2 had narrower molecular weight distribution and higher Mooney viscosity.SN232 had lower Mooney viscosity，better plasticity，and similar glass transition temperature to S40V.213-2 had higher 1，2-structure and 3，4-structure contents，lowest crystallinity.Among the three domestic grades of CR，the processing performance of SN232 were the closest to that of imported S40V.
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