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Preparation and Thermal Analysis of Flame-retardant Chitosan Thin Films on Ammonium Polyphosphate Treated Reconstituted Tobacco Sheet

Author(s):

Xiaolan Zhu*, Ning Shao, Dongliang Li, Fang Xue, Li Hou and Yun Gao   Pages 1 - 11 ( 11 )

Abstract:


Backgroud: Burning temperature is one of the most important factors affecting the chemical structure of the smoke and the addition of reconstituted tobacco sheet to cut tobacco has been widely used by the tobacco industry to reduce cost of cigarettes and the health risks of smoking.

Methods: A flame retardant film, made from chitosan and ammonium polyphosphate, has been coated on the surface of reconstituted tobacco sheet substrate by Layer-by-Layer and spray coating techniques. The thermal degradation properties and flame retardancy of these reconstituted tobacco sheets were analyzed by TG-FTIR and micro-scale combustion calorimetry.

Results: It was found that the reconstituted tobacco sheet with the ratio of chitosan (5%) and ammonium polyphosphate (3%) film coating showed significant reductions of the peak heat release rate (50.7%), total heat release (35.8%) and the highest temperature in the temperature distribution diagram (77℃). The main gases released during the pyrolysis of these reconstituted tobacco sheet samples were H2O, CO2, CO, NH3, carbonyl compounds and the presence of film coating changed the formation of evolved volatile products and formed less gaseous products except NH3 during the thermal decomposition process.

Conclusion: The coating film can greatly enhance the char forming ability and reduce the flammability of reconstituted tobacco sheet and therefore reduce the health risks of smoking with the addition of these reconstituted tobacco sheets.

Keywords:

Thermal analysis, TG-FTIR, micro-scale combustion calorimetry, flame retardants, chitosan, reconstituted tobacco sheet

Affiliation:

Research Center of Tobacco and Health, University of Science and Technology of China, Hefei 230052, Research Center of Tobacco and Health, University of Science and Technology of China, Hefei 230052, Center of Technology, China Tobacco Sichuan Industrial Corporation, Chengdu, 610066, Center of Technology, China Tobacco Sichuan Industrial Corporation, Chengdu, 610066, Research Center of Tobacco and Health, University of Science and Technology of China, Hefei 230052, Research Center of Tobacco and Health, University of Science and Technology of China, Hefei 230052



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