期刊
CARBOHYDRATE POLYMERS
卷 201, 期 -, 页码 96-104出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.07.095
关键词
Biocomposite film; Slow pyrolysis; Kinetic modeling; Iso-conversional methods; Independent parallel reactions
资金
- National Natural Science Foundation of China [51263006]
- Hainan Province of Key Project [ZDYF2017005]
- Hainan International Science and Technology Cooperation Specific [KJHZ201402]
- Ministry of PhD Education
Pyrolysis characteristics of carrageenan-polyvinyl alcohol (CG-PVA) composite films were studied on a thermo gravimetric analyzer in N-2 atmosphere. A stepwise procedure based on model-free Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS) and Friedman-Reich-Levi (FRL) methods were applied to calculate the apparent activation energies (E). The range of E for CG-PVA/LBP/K film was 16.92 similar to 171.53 kJ/mol. Coats-Redfern and master-plots methods were utilized to investigate the most probable mechanisms for CG-PVA/LBP/K film. Further kinetic analysis was performed and revealed that five independent parallel reactions were supposed reasonably by deconvoluting DTG curves. Kinetic parameters of the corresponding five pseudo-components for CG-PVA/LBP/K film were separately calculated via Kissinger's method using the peak maximum temperature. It's concluded that lignin derivatives contributed the major part of degradation process. The orders of activation energy for pseudo components are E (PVA) > E (carrageenan) > E (biomass derivatives). The comprehensive analysis of pyrolysis kinetics may expand application fields of carrageenan based biocomposite films.
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