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Thermal aging of HTPB/IPDI-based polyurethane as a function of NCO/OH ratio

Villar, Luciene Dias ; Cicaglioni, Thiago ; Diniz, Milton Faria ; Takahashi, Marta Ferreira Koyama ; Rezende, Luis Cláudio

Materials research (São Carlos, São Paulo, Brazil), 2011-09, Vol.14 (3), p.372-375 [Periódico revisado por pares]

ABM, ABC, ABPol

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Título:
Thermal aging of HTPB/IPDI-based polyurethane as a function of NCO/OH ratio
Autor: Villar, Luciene Dias ; Cicaglioni, Thiago ; Diniz, Milton Faria ; Takahashi, Marta Ferreira Koyama ; Rezende, Luis Cláudio
Assuntos: aging ; Correlation ; Crosslinking ; Degradation ; Diisocyanates ; ENGINEERING, CHEMICAL ; HTPB ; MATERIALS SCIENCE, MULTIDISCIPLINARY ; METALLURGY & METALLURGICAL ENGINEERING ; Networks ; Ovens ; polyurethane ; Polyurethane resins ; Tensile tests
É parte de: Materials research (São Carlos, São Paulo, Brazil), 2011-09, Vol.14 (3), p.372-375
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
Descrição: Thermal aging of hydroxy-terminated polybutadiene/isophorone diisocyanate (HTPB/IPDI)-based polyurethane was studied as a function of NCO/OH ratio (1.0 and 0.85). Samples were aged in air ovens at 50, 60, 65, and 70 degree C for periods of time from 1 to 34 weeks. Changes in chemical (swelling testing and FT-IR spectroscopy) and mechanical (tension testing and hardness) properties were evaluated throughout the aging assays. Correlation between equilibrium swelling ratio and clastic modulus, coupled with changes in FT-IR spectra, indicated oxidative cross-linking as the dominant mechanism for both molar ratios investigated. However, determination of Arrhenius activation energy resulted in values of (82 plus or minus 10) kJ.mol super(-1) and (156 plus or minus 30) kJ.mol super(-1) for 1.0 and 0.85 NCO/OH ratios, respectively, thus revealing faster oxidative degradation kinetics for higher urethane linkage networks.
Editor: ABM, ABC, ABPol
Idioma: Inglês;Português;Espanhol

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Thermal aging of HTPB/IPDI-based polyurethane as a function of NCO/OH ratio

Villar, Luciene Dias ; Cicaglioni, Thiago ; Diniz, Milton Faria ; Takahashi, Marta Ferreira Koyama ; Rezende, Luis Cláudio

ABM, ABC, ABPol

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