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1.绪言 EPDM是把EPM经过化学改性,能用硫黄硫化的一种材料,它具有优良的耐候性和耐热性。在以双环戊二烯(D)、1,4—己二烯(HD)、乙又降冰片烯(ENB)等二烯烃为第三单体的EPDM中,ENB型EPDM比D型及HD型EPDM的硫化速度快,这已是众所周知的了,但是由于二烯烃的不同而出现硫化速度差异的原因还不清楚。本研究的目的就是通过搞清楚EPDM交联点的聚合物分子结构,来说明硫化速度的差异。因此,在EPDM存在的均一体系中,有机过氧化物加热分解产生的低分子自
1. INTRODUCTION EPDM is a material that is chemically modified to sulfurize EPM and has excellent weatherability and heat resistance. In EPDM which uses as a third monomer diolefins such as dicyclopentadiene (D), 1,4-hexadiene (HD) and ethyl norbornene (ENB), the ENB type EPDM has a higher density than the D type and the HD type It is well-known that EPDM vulcanizes at a high rate, but the reason why the difference in the rate of vulcanization occurs due to the difference in dienes is not clear. The purpose of this study is to clarify the differences in vulcanization rates by figuring out the molecular structure of the polymer at the EPDM crosslinking point. Therefore, in the homogeneous system where EPDM exists, the low molecular weight