TG-MS Studies on Polystyrene,Its Derivatives,and Polyolefins--Relation between Thermal Decomposition Behavior and Ceiling Temperature (TMS特集号)

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概要

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• The thermal decomposition behaviors of polystyrene, its derivatives, and polyolefins were investigated by thermogravimetric method in which gas chromatography and/or mass spectrometry are interfaced. Decomposition products of polystyrene and poly(p-methyl styrene) were found to be predominantly monomers with a few dimers. In the case of the poly(α-methyl styrene), the monomer was observed as the predominant species and the amounts of other products were quite negligible. As for the formation ratio of dimer to monomer, the observed ratios for polystyrene and poly(p-methyl styrene) were all less than those reported in the literatures obtained by isothermal method. Dimers were detected only in a high temperature range, where the mass loss was seldom to occur. Since the formations of the most of dimers are considered to occur at the completion of the decomposition reactions, the most of dimers are produced from secondary reactions in the case of polystyrene and its derivatives. The decomposition products of polyolefins were mixtures of hydrocarbons. Especially, the major decomposition products of polyethylene were hydrocarbons of C10-C14, and the monomer was not observed. From considering the molecular structures of cyclic products, it was seen that the secondary reaction(s) occurred to form the complicated final products in the case of polypropylene. The relation between the decomposition temperature of polymers and the ceiling temperature of their monomers was noted. In case that the thermal decomposition temperature range is above the ceiling temperature, a lot of monomer is produced, while if it is below the ceiling temperature, the monomer is rarely observed.

• 日本質量分析学会の論文
• 1999-12-01

著者

• CHEN Jian

  Department of Electronics, Nagaoka University of Technology

• Chen J

  Department Of Materials Science And Engineering Faculty Of Engineering Fukui University

• ISA Kimio

  Department of Natural Science Education, Faculty of Education and Regional Studies, Fukui University

• KODAIRA Toshiyuki

  Department of Materials Science and Engineering, Faculty of Engineering, Fukui University

• Isa K

  Faculty Of Education And Regional Studies University Of Fukui

• Isa Kimio

  Department Of Chemistry Faculty Of Education And Regional Studies Fukui University

• Senda T

  Ship Res. Inst. Ministry Of Transport Tokyo

• SENDA Tetsuya

  Rigaku Co., Ltd.

• Senda Tetsuya

  Rigaku Co. Ltd.

• Chen Jian

  Department Of Biotechnology Southern Taiwan University Of Technology

• Kodaira T

  Department Of Materials Science And Engineering Faculty Of Engineering Fukui University

• Chen Jian

  Department Of Biochemistry And Molecular Biology Third Military Medical University

• Kodaira Toshiyuki

  Department of Industrial Chemistry, Faculty of Engineering, Fukui University

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