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    • Keywords


      Unsaturated polyester resin; resin curing; gel time; exotherm behaviour; peroxide initiator.

    • Abstract


      A judicious choice of curing agents such as initiator and promoter and their ratio to the resin can avoid reduced gel-time and shortened exothermic reactions in applications such as liquid compositemoulding processes. In this study, effects of different ratio of initiator and promoter to the unsaturated polyester resin on curing of the resin were investigated by measuring gel-time and peak exotherm using ASTM D2471 standards. Methyl ethyl ketone peroxide (MEKP) was used as an initiator and a cobalt salt was employed as an accelerator for the free radical polymerization of curing resin at ambient temperatures. It was observed that the resin gelation starts closely with the initial rise in exotherm temperature and time of gelation decreases with the increase in initiator or accelerator volume proportions. It was also found that the exotherm-peak and rate of temperature rise indicating that the curing rate increases with the initiator or accelerator proportions also increased. A nonlinear regression analysis of all geltime and cure data were performed to quantify the dependence of curing parameters on the volume proportions of accelerator and initiator. Thus, for this polymerization initiation system, the gel-time and cure parameters can be predicted for any initiator and cobalt levels within the ranges studied.

    • Author Affiliations


      Raghu Raja Pandiyan Kuppusamy1 Swati Neogi2

      1. Birla Institute of Technology, Mesra, Ranchi 835 215, India
      2. Department of Chemical Engineering, Indian Institute of Technology, Kharagpur 721 302, India
    • Dates

  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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