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Microstructural Organization of Polydimethylsiloxane Soft Segment Polyurethanes Derived from a Single Macrodiol by Taeyi Choi; Jadwiga Weksler; Ajay Padsalgikar; James Runt is a Materials Science article available to read on EtoBox.

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Segmented polyurethane (PU) block copolymers were synthesized using 4,4 0 -methylenediphenyl diisocyanate and 1,4-butanediol as hard segments and oligomeric ethoxypropyl polydimethylsiloxane (PDMS) as the soft segments, with hard segment contents ranging from 26 to 52 wt%. The microphase separated morphology, phase transitions, and degrees of phase separation of these novel copolymers were investigated using a variety of experimental methods. Like similar copolymers with mixed ethoxypropyl PDMS/poly(hexamethylene oxide) soft segments, PU copolymers containing only ethoxypropyl PDMS soft segments were found to consist of three microphases: a PDMS matrix phase, hard domains, and a mixed phase containing ethoxypropyl end group segments and dissolved short hard segments. Analysis of unlike segment demixing using small-angle X-ray scattering demonstrates that degrees of phase separation increase significantly as copolymer hard segment content increases, in keeping with findings from Fourier transform infrared spectroscopy measurements.

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Author

Taeyi Choi; Jadwiga Weksler; Ajay Padsalgikar; James Runt

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

2010

Language

EN

Field

Materials Science (Physical Sciences)