Introduction of Tetramethyldisiloxane Moiety into Polyetherurethaneurea

Abstract

Polyetherurethaneureas (PEUU-Si) including the tetramethyldisiloxane moiety in main chain were obtained from a typical two step polyaddition of polytetrahydrofuran (PTHF) to 4, 4'-methylene-bi s (phenylisocyanate) (MPI) in the presence of 1, 3-bis (3-hydroxypropy1)-1, 1, 3, 3-tetramethyldisiloxane (TMDS), using ethylenediamine (EDA) as a chain extension reagent. Polyaddition with a molar ratio of 1: 2: 1 for PTHF + TMDS: MPI: EDA gave the PEUU-Si in the mixed solvent of dimethyl sulfoxide and isobutyl methyl ketone, where the molar ratio of TMDS was changed from 0.2 to 1.0. From the XPS spectra and the contact angle measurements, it was found that the TMDS moiety was located on the surface of the PEUU-Si film in air and hydrophobicity was increased with increasing the molar ratio of the TMDS moiety. It was also found that PEUU-Si adsorbed bovine serum albumin. The tensile modulus of PEUU-Si showed E= 66-120 MPa.