Alternate Siloxane-Urethane Copolymer by Three-Step Reaction

Alternate Siloxane-Urethane Copolymer by Three-Step Reaction [Pg.194]

Recently, Adhikari et al. examined the effect of mixed-chain extenders on the properties and morphology of polyurethane-siloxane copolymers. In a two-step process, they made low molecular weight prepolymers with PDMS, poly(hexameth-ylene oxide) (PHMO) and MDI. The prepolymers were treated with 1,4-butane diol (EDO) and l,3- w(4-hydroxybutyl)-l,l,3,3-tetramethyldisiloxane (BHTD) and cured. A 60 40 molar ration of BDO BHTD chain extender yielded a polyurethane that combined good tensile strength and flexibility. [Pg.195]

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