Synthesis and characterization of α,ω‐bis(4‐hydroxybutyl) polydimethylsiloxanes

Abstract

α,ω‐Bis(4‐hydroxybutyl) polydimethylsiloxane (molecular weight 1500 to 4500) can be pre‐pared with well‐controlled molecular weight through the reaction of 1,3‐bis(4‐hydroxybu‐tyl)tetramethyl disiloxane and dimethoxydimethyl silane or diethoxydimethyl silane in the presence of a stoichiometric amount of water and hydrochloric acid. The molecular weight of these hydroxybutyl‐terminated polysiloxanes can be determined fairly consistently by a titration method. These polysiloxanes are stable toward cyclization. © 1995 John Wiley & Sons, Inc.

Comparative studies of poly(dimethyl siloxanes) using automated GPC-MALDI-TOF MS and on-line GPC-ESI-TOF MS

“…Fei and Murray [41] have reported on-line GPC coupling to a MALDI source. However, to date most GPC-MALDI analysis employs deposition of the GPC effluent onto a MALDI sample target followed by mass analysis [42][43][44][45][46][47][48][49]. This method is not considered to be true on-line hyphenation, when compared to GPC-ESI MS, since the deposition of GPC effluent and subsequent mass analysis occurs in two discrete time events.…”

A framework for accurate evaluation of the promise of aquaporin based biomimetic membranes

“…In the first step, α,ω-Bis(4-hydroxybutyl)polydimethylsiloxane (PDMS) was synthesized, by polycondensation of dimethoxydimethyl silane, water and 3-bis(4-hydroxybutyl)tetramethyl disiloxane [12]. PDMS was further activated with trifluoromethanesulfonic anhydride and resulting triflic acid was quenched by triethylamine in cold anhydrous hexane [11].…”

Novel polyurethane–silicone hydrogels

“…Preparations of polysiloxane-based polyurethane prepolymers with different arrangements of hard segments in a manner similar to that of polypropylene-glycol-based prepolymers were described elsewhere. [12][13][14] In this study, polyurethane hydrogels derived from these polysiloxane-based polyurethane prepolymers are described.…”