Deterioration of novel polyesterurethane elastomers in outdoor exposure

• Published in: Polymer degradation and stability Vol. 65; no. 1; pp. 15 - 24
• Main Authors: Furukawa, M, Wakiyama, K
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.07.1999; Elsevier Science
• Subjects: Ageing; Alkyl side group; Applied sciences; DSC; ESR; Exact sciences and technology; FT–IR; Mechanical properties; Physical properties; Polyesterurethane; Polymer industry, paints, wood; Properties and testing; Technology of polymers; Weatherability; ESR; DSC; FT–IR; Mechanical properties; Weatherability; Polyesterurethane; Alkyl side group; Substituent effect; Esterurethane polymer; Dynamic mechanical properties; Crosslink density; Crosslinked polymer; Reaction mechanism; Weathering; Tensile property; Property structure relationship; Experimental study; Polyurethane elastomer
• ISSN: 0141-3910; 1873-2321
• DOI: 10.1016/S0141-3910(98)00209-2

Poly(esterurethane)-elastomers based on novel polyester glycols with methyl side groups were exposed outdoors for 2 years. The polyester glycols used are poly(β-methyl-δ-valerolactone)glycol (PMVL), poly(3-methyl pentamethylene adipate) glycol (PMPA), poly(nonamethylene-co-2-methyl octamethylene carbonate) glycol (PNOC). A mixture of PNOC and poly(dimethyl siloxane)glycol (PNOC/PDMS) was also used. Polyurethane network elastomers, were prepared from these polymer glycols, 4,4′-diphenylmethane diisocyanate, and a mixture of 1,4-butanediol with trimethylol propane by a prepolymer method. The deterioration behavior of the PUEs was measured by means of polarizing microscopy, DSC, tensile testing, dynamic viscometry, and ESR. The novel polyester-based PUEs have better weatherability than poly(oxytetramethylene) glycol (PTMG)-based PUE. The mechanisms of deterioration are discussed. ©