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On Thermal Decomposition and Kinetics of Lac Resin

DONGGuohua,JIHaobo,ZHANGHong,ZHENGHua,LIKai,LIKun   

  1. 1.AcademicAffairsOffice,YunnanArtsandCraftsCollege,Kunming650224,China;
    2.DivisionofScience&Technology,KunmingMetallurgyCollege,Kunming650033,China;3.ResearchInstituteofResourcesInsects,ChineseAcademyofForestry,ResearchCenterofEngineeringandTechntologyonForestResourceswithCharacteristics,StateForestryAdministration,Kunming650224,China
  • Received:2017-05-27 Online:2017-12-19 Published:2017-12-19

Abstract: The kinetic parameters of lacresin's thermal decomposition play an important role in its application and expanding application fields.By the thermogravimetric experiment with separate testing heating rates of 5,10,20,40K/min and final temperature of 883K,this paper draws the conclusions as follows:the thermal decomposition of lac resin is a one-step reaction,with its maximum decomposition temperature increased by heating rates both at the start and the end of the reaction;the activation energies of lac resin thermal decomposition reaction are 249.49kJ/mol and 260.46kJ/mol calculated separately by Kissinger and Starink methods;further calculation by FWO and FRL,it gets the value of (254.52±31)kJ·mol-1;by Malek,it confirms that the mechanism of thermal decomposition reaction matches the J-M-A equation:the nucleation and grow that random.Accordingly,the range of n and lgA calculated is between 0.0696~0.0756 and 13.38~14.53.By the same thermogravimetric experiment with final temperature of 843K,the start,end and peaking temperatures at viscous flow transition are measured separately at 328.0K,341.4K and 356.5K and the enthalpy and entropy changes at viscous flow transition are averagely at 58.41J/g and 0.17J/g·K under the 4 heating rates mentioned above.

Key words: lac resin, thermal decomposition, kinetics, reaction mechanism, thermo dynamics

CLC Number: