화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.26, No.8, 680-689, August, 2018
DOI10.1007/s13233-018-6103-3  Export Citation
Initiation Mechanisms of Styrene with Methyl Ethyl Ketone Peroxide-Cobalt System
Ruiwei Guo, Yaqi Wang, Yongtao Qi, Auke G Talma1, and Jianhua Zhang†
  • Department of Polymer Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P. R. China
  • 1AkzoNobel Polymer Chemistry, P.O. Box 10, 7400 AA Deventer, the Netherlands
E-mail:
Unsaturated polyester resins (UPR) cured with styrene has been widely used in the various industrial fields. Methyl ethyl ketone peroxides (MEKP)-cobalt(II) system is the most common initiator for the curing of UPR. However, its initiation mechanisms currently remain elusive. In this study, the monomeric MEKP (MEKP-1) was firstly separated out from the commercial MEKP products, and then the radical initiation mechanisms of MEKP-1 catalyzed by cobalt isooctoate in the presence and absence of styrene were comparatively investigated by a combination of nitroxide radical trapping technique and HPLC-ESI/MS (high performance liquid chromatography-electrospray ionization/mass spectrometry). The amount of trapped products originated from methyl radical, ethyl radical and hydroxyl radical was significantly larger than that of trapped products from other radicals. These results indicated that methyl, ethyl and hydroxyl radicals were the dominant intermediate radicals formed in the initiation process of MEKP-cobalt(II) system, which would serve as the primary source to initiate styrene polymerization.
Keywords:MEKP;initiation mechanism;radical trapping technique;cobalt isooctoate;HPLC-ESI/MS
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