PyGC-MS法によるポリウレタン-アミドおよびポリウレタン-イミドの熱分解生成物の同定と熱分解機構の検討

概要

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The pyrolysis products of Polyurethane-polyamide copolymer (PU-PA) and polyurethane-polyimide copolymer (PU-PI) were identified using the PyGC-MS method and the degradation mechanisms of these coplymer were studied. PU-PA and PU-PI were synthesized from a polyurethane prepolymer and a polyamide or polyamide acid. The polyurethane prepolymer was the phenol-blocked isocyanate-terminated poly(ethylene adipate) (PEA)-2,4-tolylenediisocyanate (TDI) adduct. The polyamide was synthesized from 1-(m-aminophenyl)-2-(p-aminophenyl)ethanol and terephtaloyl chloride. The polyamic acid was prepared by reaction of pyromellitic dianhydride with 4, 4'-diaminodiphenylether. PU, PA, PU-PA, and PU-PI used as a sample were pyrolyzed at 250℃, 550℃, and 750℃. Urethane linkages of PU-PA were initially decomposed to PU and PA components between 250℃ and 410℃. The PU components were decomposed to PEA component, TDI, tolylene-amino-isocyanate (MAMI) at 250°C. PEA residues in PU components were also decomposed to small molecules at 410℃. The PA component between 550℃ and 650℃ was decomposed to various PA original pyrolysis products. PU-PI was pyrolyzed at urethane and amide groups to PU and PI component. PI components were decomposed to much smaller aromatic compounds between 600℃ and 650℃. The pyrolysis mechanisms of these copolymers were offered.
2004-01-30