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- W2019291221 abstract "Thermal relaxation transitions of toluene diisocyanate (TDI)-based polyurethanes (PU) were characterized by the thermally stimulated current (TSC) technique with verification data from the relaxation mapping analysis (RMA) measurement. TDI-based PU elastomers with poly(propylene glycols) (PPG) as the soft segment and methylene-bis-orthochloroaniline (MOCA) as the hardener, showed three relaxation transitions, (1) a subglass transition (Tg) of the terminal groups occurred near −135°C; (2) the Tg; and (3) a global transition occurred above the Tg (assigned as Tglobal transition). The temperature of Tg of PU as expected was varied by the chain length and attributed by the motion of an urethanic chain dominated by the soft segment and may also associate in the cooperative movement with the hard segment. The Tglobal transition appearing above the Tg was identified and attributed to the global transition in the macromolecule scale and was supported by the tangent plot of the dynamic mechanical analyzer (DMA) measurement. The TSC measurement on thermal characteristic transitions of TDI-based PU provided a whole range of thermal transitions including a sub-Tg, the Tg (observed by DSC) to a global transition (may be observed by DMA) with the ease of sample preparation in one single measurement. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 527–545, 1999" @default.
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- W2019291221 date "1999-07-25" @default.
- W2019291221 modified "2023-09-27" @default.
- W2019291221 title "Characterization of the relaxation transitions in toluene diisocyanate-based polyurethanes with poly(propylene glycol) as the soft segment by thermally stimulated current depolarization with relaxation mapping analysis" @default.
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- W2019291221 doi "https://doi.org/10.1002/(sici)1097-4628(19990725)73:4<527::aid-app9>3.0.co;2-4" @default.
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