Temperature dependent microphase mixing of model polyurethanes with different intersegment compatibilities

Suphannee Pongkitwitoon, Rebeca Hernández, Jadwiga Weksler, Ajay Padsalgikar, Taeyi Choi, James Runt

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

In this paper we explore the temperature dependence of segregation of hard and soft segments of selected segmented polyurethane copolymers using synchrotron small-angle X-ray scattering (SAXS). The copolymers are composed of the same hard segments but three different soft segment chemistries, of particular interest in biomedical device applications. Hard segments are formed from 4,4′-methylenediphenyl diisocyanate and 1,4-butanediol, and soft segments from an aliphatic polycarbonate [poly(1,6-hexyl 1,2-ethyl carbonate)], poly(tetramethylenoxide), or a mixed soft segment synthesized from hydroxyl-terminated poly(dimethylsiloxane) [PDMS] and poly(hexamethylenoxide) macrodiols. The changes in SAXS relative invariants and interdomain spacings are indicative of gradual dissolution of phase separated hard and soft segments with increasing temperature. All copolymers investigated herein, even those containing PDMS soft segments, transform to the single-phase state at a temperature determined by the soft segment chemistry (and hard segment content). The SAXS findings, along with those from parallel temperature-controlled Fourier Transform infrared spectroscopy measurements, also facilitate assignment of the origin of the thermal events observed in the DSC thermograms of these materials.

Original languageEnglish (US)
Pages (from-to)6305-6311
Number of pages7
JournalPolymer
Volume50
Issue number26
DOIs
StatePublished - Dec 10 2009

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Polyurethanes
X ray scattering
polycarbonate
Copolymers
Polydimethylsiloxane
Temperature
Polycarbonates
Synchrotrons
Hydroxyl Radical
Fourier transform infrared spectroscopy
Carbonates
Dissolution
baysilon

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Pongkitwitoon, S., Hernández, R., Weksler, J., Padsalgikar, A., Choi, T., & Runt, J. (2009). Temperature dependent microphase mixing of model polyurethanes with different intersegment compatibilities. Polymer, 50(26), 6305-6311. https://doi.org/10.1016/j.polymer.2009.10.067
Pongkitwitoon, Suphannee ; Hernández, Rebeca ; Weksler, Jadwiga ; Padsalgikar, Ajay ; Choi, Taeyi ; Runt, James. / Temperature dependent microphase mixing of model polyurethanes with different intersegment compatibilities. In: Polymer. 2009 ; Vol. 50, No. 26. pp. 6305-6311.
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Pongkitwitoon, S, Hernández, R, Weksler, J, Padsalgikar, A, Choi, T & Runt, J 2009, 'Temperature dependent microphase mixing of model polyurethanes with different intersegment compatibilities', Polymer, vol. 50, no. 26, pp. 6305-6311. https://doi.org/10.1016/j.polymer.2009.10.067

Temperature dependent microphase mixing of model polyurethanes with different intersegment compatibilities. / Pongkitwitoon, Suphannee; Hernández, Rebeca; Weksler, Jadwiga; Padsalgikar, Ajay; Choi, Taeyi; Runt, James.

In: Polymer, Vol. 50, No. 26, 10.12.2009, p. 6305-6311.

Research output: Contribution to journalArticle

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AU - Choi, Taeyi

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Pongkitwitoon S, Hernández R, Weksler J, Padsalgikar A, Choi T, Runt J. Temperature dependent microphase mixing of model polyurethanes with different intersegment compatibilities. Polymer. 2009 Dec 10;50(26):6305-6311. https://doi.org/10.1016/j.polymer.2009.10.067