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A novel hydroxypolyether blocked polydimethylsiloxane,poly(ethylene oxide)propyl-b-polydimethylsiloxane-b-propyl poly(ethylene oxide)(PEO-b-PDMS-b-PEO)was synthesized by simple hydrosilation reaction of poly(ethylene glycol)monoallyl ether withα,ω-dihydrogen terminated PDMS(HPDMS).Fourier transform infrared spectroscopy(FTIR)and ~1H NMR were used to identify the structure of PEO-b-PDMS-b-PEO and intermediate product HPDMS.Based on the effect investigations of temperature, reactant molar ratio,catalyst and time on the hydrosilation,it was found that the conversion of Si-H bond to Si-C bond increased with the increase of catalyst and time,and the reaction completed when the content of catalyst was 22μg/g and the time was 5h, respectively.Urethane reaction of OH and NCO group confirms that PEO-b-PDMS-b-PEO is more reactive toward to diisocyanate thanα,ω-dihydroxylbutyl terminated PDMS.
A novel hydroxypolyether blocked polydimethylsiloxane, poly (ethylene oxide) propyl-b-polydimethylsiloxane-b-propyl poly (ethylene oxide) (PEO-b-PDMS-b-PEO) was synthesized by simple hydrosilation reaction of poly (ethylene glycol) monoallyl ether With Fourier transform infrared spectroscopy (FTIR) and ~ 1H NMR were used to identify the structure of PEO-b-PDMS-b-PEO and intermediate product HPDMS. Based on the effect investigations of temperature , reactant molar ratio, catalyst and time on the hydrosilation, it was found that the conversion of Si-H bond to Si-C bond increased with the increase of catalyst and time, and the reaction completed when the content of catalyst was 22 μg / g and the time was 5h, respectively. Urethane reaction of OH and NCO group confirms that PEO-b-PDMS-b-PEO is more reactive toward to diisocyanate than α, ω-dihydroxylbutyl terminated PDMS.