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Effects of Mold Temperatures on Physical Properites of Injection Molded Thermoplastic Polyurethanes  

Lee, Dai-Soo (Division of Environmental and Chemical Engineering Chonbuk National University)
Kim, Seong-Geun (Division of Environmental and Chemical Engineering Chonbuk National University)
Nguyen, Vinh-Khanh (Division of Environmental and Chemical Engineering Chonbuk National University)
Lee, Wing-Ji (Division of Environmental and Chemical Engineering Chonbuk National University)
Pang, Su-Jin (Division of Environmental and Chemical Engineering Chonbuk National University)
Publication Information
Elastomers and Composites / v.39, no.4, 2004 , pp. 286-293 More about this Journal
Abstract
Ester- and ether-based thermoplastic polyurethanes of different hardness were injection molded at different mold temperatures and effects of mold temperature on the physical properties of TPUs were investigated. Glass transition temperatures of soft segments of TPUs were hardly changed by mold temperatures. The phase separation of soft and hard segments of injection molded TPUs were affected little by mold temperatures. However, crystallinity of hard segments, temperature range of rubbery plateau, and tensile strength of injection molded TPUs decreased with increasing mold temperatures for TPUs of high hardness. However, injection molded TPUs of low hardness showed increases of crystallinity of hard segments, temperature range of rubbery plateau, and tensile strength with increasing mold temperatures. Different physical properties of injection molded TPUs depending on mold temperatures were attributed to different crystallization and physical crosslinking effects of hard segments.
Keywords
thermoplastic polyurethane; mold temperature; crystallization; physical property;
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Times Cited By KSCI : 1  (Citation Analysis)
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