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Urethane foams from animal fats. III. Oxypropylated dihydroxystearic acids in rigid foams
Author(s) -
Saggese E. J.,
Scholnick Frank,
Zubillaga Marta,
Ault Waldo C.,
Wrigley A. N.
Publication year - 1967
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02908370
Subject(s) - polyol , blowing agent , polyurethane , propylene oxide , prepolymer , materials science , polymer chemistry , chemistry , composite material , polymer , copolymer , ethylene oxide
Liquid polyols consisting of threo ‐or erythro ‐9,10‐dihydroxystearic acid previously reacted with 1, 2, 4, 6 and 8 moles of propylene oxide were adjusted with triisopropanolamine to equivalent weight 100. Using trichlorofluoromethane as blowing agent and triethylenediamine as catalyst, the adjusted polyols were foamed by reaction with a prepolymer made from oxypropylated sorbitol and tolylene diisocyanate. The resulting rigid foams had densities between 1.6 and 2.0 lb/ft 3 , the densities for the threo series being parallel to but higher at each stage of oxypropylation than those of the erythro series. Compressive strengths in the erythro series ranged from 19 psi for the monooxypropylated compound to 38 psi for the octaoxypropylated member; in the threo series from 27 to 39 psi. Properties improved in both series as the degree of polyol oxypropylation increased. This contrasted with foams prepared earlier from oxyethylated polyols, whose properties generally reached maxima at intermediate degrees of oxyethylation. Using the tetra‐and hexaoxypropylated threo polyols, the proportion of blowing agent was varied to relate compressive strength to density of foams between 1.4 and 4 lb/ft 3 .