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Thermal Properties of Polyurethane Elastomers Prepared with MBCA/DMTDA Mixture as Curing Agent

MBCA/DMTDA 혼합경화제를 이용한 폴리우레탄 탄성체의 열적 성질

  • Received : 2016.05.02
  • Accepted : 2016.06.02
  • Published : 2016.06.30

Abstract

Both melting temperature and enthalpy of MBCA/DMTDA mixtures were measured as a function of DMTDA compositions using DSC. The thermal properties of polyurethane elastomer samples prepared with MBCA, DMTDA, and 40/60 MBCA/DMTDA mixture as curing agents were also observed using TGA. MBCA and DMTDA showed good miscibility over the entire composition range, exhibiting individual DSC melting peaks. Peak temperatures were non-linearly reduced as DMTDA concentrations increased, being approximately $60^{\circ}C$ in the case of the 40/60 MBCA/DMTDA mixture. Furthermore, melting enthalpy of the mixture was calculated as 3.8 J/g, which was only 4.3% compared to 87.3 J/g of MBCA. Based on these results, crystallization of the mixture was considered to occur very slowly, and the fluidic gel-state of the mixture was visually confirmed to be maintained over 5 days at room temperature. Thermal decomposition of polyurethane elastomer prepared with 40/60 MBCA/DMTDA curative started at about $190^{\circ}C$, which is similar to that observed for DMTDA, only except decomposition behavior over higher temperature of $400^{\circ}C$.

Keywords

MBCA;DMTDA;MBCA/DMTDA mixture;Polyurethane Elastomer;Thermal Property

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