Moisture‐cured polyurethane is one of the commercially important polymers, which is widely used in sealants, coatings, and reactive hot‐melt adhesives. A series of moisture‐cured polyurethane/polysiloxane (PUSR) copolymers were successfully prepared using a two‐step solution polymerization procedure. Both amine‐terminated polysiloxane (PDMS) and polyester diol were together used as mixed soft segments to react with 4,4′‐diphenlymethane diisocyanate (MDI), and the alkoxysilane was used as end‐capping agents. The effects of structure variation of building blocks such as the polyester diol structure and NCO/OH ratio on the properties and morphology of PUSR copolymers were studied. The tensile properties, dielectric behavior, thermal stability, surface, and water‐repellency properties were investigated. The results showed that the properties and morphology of PUSR copolymers were greatly affected by the variations in molecular architecture.
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Jiang et al. (2008) studied this question.
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