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Effect of Chain Structure of Diisocyanate and Chain Extender on the Thermal Characteristics of Polyurethane  

Park, Ki-Ho (Department of Textile Engineering, In-ha University)
Jin, Gangfu (Department of Textile Engineering, In-ha University)
Lee, Han-Sup (Department of Textile Engineering, In-ha University)
Publication Information
Textile Science and Engineering / v.45, no.2, 2008 , pp. 111-119 More about this Journal
Abstract
Polyurethane(PU), a type of thermoplastic elastomer, consists of two different segments (hard and soft segments) that are incompatible at room temperature. Depending on the chemical and physical structure of those two segments, polyurethane shows various internal structures. In this study, a series of polyurethane were synthesized using PPDI (l,4-phenylene diisocyanate), TODI(3,3'-dimethyl diphenyl 4,4'-diisocyanate), MDI(4,4'-diphenylmethane diisocyanate) as disocyanate, 1,4 BD and HQEE(hydroxyquinone-di-(beta-hydroxyethyl)ether) as chain extender in order to test the effect of chemical structure of hard segment on the phase separation behavior and thermal stability of polyurethane. The effect of diisocyanate and chain extender on the thermal stability of polyurethane was measured with DSC, POM, SAXS and FTIR methods. Compared with PU based on the asymmetric and aliphatic component, PUs based on the symmetric and aromatic chemical structures were found to form phase separated structure showing enhanced thermal stability. The good thermal properties were also explained in terms of the good packing behavior between hard segments in the PPDI-based polyurethane.
Keywords
PPDI(1,4-phenylene diisocyanate); TODI (3,3'-dimethyldiphenyl 4,4'-diisocyanate); phase separation;
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Times Cited By KSCI : 2  (Citation Analysis)
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