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Polycaprolactone procedures

Preparation of Cast Elastomers. The cast elastomers were prepared in a two-step procedure. First prepolymers were made from one polyether polyol (poly(oxy-tetramethylene) glycol of 1000 M.W., (POTMG)) and two polyester polyols (adipate polyester of 2000 M.W. (PAG) and polycaprolactone of 1250 M.W. (PCL)) by reaction with the corresponding diisocyanates (MDI, PPDI, CHDI or NDI) at an NCO/OH ratio of 2/1. The temperature was maintained at 80°C and periodic samples were withdrawn to determined the isocyanate content. When the isocyanate content of the mixture reached within 0.3% of the calculated value, the reaction was stopped by cooling. The prepolymer could be kept for a period of six months in the absence of moisture. The isocyanate-terminated prepolymers were then chain-extended with... [Pg.420]

See other pages where Polycaprolactone procedures is mentioned: [Pg.74]    [Pg.74]    [Pg.424]    [Pg.292]    [Pg.32]    [Pg.679]    [Pg.476]    [Pg.141]    [Pg.2]    [Pg.2]    [Pg.589]    [Pg.193]    [Pg.130]    [Pg.333]    [Pg.293]    [Pg.156]    [Pg.183]   
See also in sourсe #XX -- [ Pg.72 ]



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