Control of Mechanical Properties of Thermoplastic Polyurethane Elastomers by Restriction of Crystallization of Soft SegmentReportar como inadecuado


Control of Mechanical Properties of Thermoplastic Polyurethane Elastomers by Restriction of Crystallization of Soft Segment


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1

Materials Science and Engineering Department, Faculty of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan

2

Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan

3

Materials and Science Department, Graduate School of Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan





*

Author to whom correspondence should be addressed.



Abstract Mechanical properties of thermoplastic polyurethane elastomers based on either polyether or polycarbonate PC-glycols, 4,4’-dipheylmethane diisocyanate 1,1’-methylenebis4-isocyanatobenzene, 1,4-butanediol, were controlled by restriction of crystallization of polymer glycols. For the polyether glycol based-polyurethane elastomers PUEs, polyoxytetramethylene glycol PTMG, and PTMG incorporating dimethyl groups PTG-X and methyl side groups PTG-L were employed as a polymer glycol. For the PC-glycol, the randomly copolymerized PC-glycols with hexamethylene C6 and tetramethylene C4 units between carbonate groups with various composition ratios C4-C6 = 0-100, 50-50, 70-30 and 90-10 were employed. The degree of microphase separation and mechanical properties of both the PUEs were investigated using differential scanning calorimetry, dynamic viscoelastic property measurements and tensile testing. Mechanical properties could be controlled by changing the molar ratio of two different monomer components. View Full-Text

Keywords: thermoplastic polyurethane elastomer; crystallization; microphase separation; mechanical properties thermoplastic polyurethane elastomer; crystallization; microphase separation; mechanical properties





Autor: Ken Kojio 1,* , Mutsuhisa Furukawa 2, Yoshiteru Nonaka 3 and Sadaharu Nakamura 3

Fuente: http://mdpi.com/



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