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Structural modifications of segmented poly(hydroxyether-siloxane) copolymers

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Hydroxyether linked copolymers were synthesized from α,ω-bis(aminopropyl)polydimethyl diphenylsiloxane oligomers and diglydicylether of bisphenol-A (DGEBA). The siloxane oligomers were synthesized by the bulk coequilibration of the various weight percents cyclic dimethylsiloxane tetramer (D4) with cyclic diphenylsiloxane tetramer (D4″) using a basic catalyst. The molecular weight and functionality was controlled by the incorporation of 1,3-bis(aminopropyl)-tetramethyldisiloxane end blocker. The copolymers containing low diphenylsiloxane compositions have two Tg's suggesting a microphase separation. Networks containing higher diphenylsiloxane compositions show a single phase morphology. The mechanical behavior of these copolymers is influenced by the composition changes.

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Hedrick, J.L., Hofer, D.C., Russell, T.P. et al. Structural modifications of segmented poly(hydroxyether-siloxane) copolymers. Polymer Bulletin 19, 573–578 (1988).

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  • Oligomer
  • Mechanical Behavior
  • Weight Percent
  • Single Phase
  • Siloxane