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• W2094426791 endingPage "144" @default.
• W2094426791 startingPage "135" @default.
• W2094426791 abstract "Gel Permeation chromatography (GPC) yielded high values for branching frequency. Low polymers persisting long into the reaction and impurities resulted in almost constant number average molecular weights and steeply rising polydispersity. The percent insolubles was low and passed through a maximum attributed to a 1,2,3-propantriol/isocyanate reaction product which was insoluble and became solubilized by the addition of polybutadiene. The dynamic viscosities of the products rose with conversion. When studied over various shear rates, the curves could be extrapolated to zero shear values. The relationship between zero shear viscosity and molecular weight yielded a slope of 3.5 for linear samples and a lightly branched sample prepared using 1,6-hexamethylene diisocyanate. The lightly branched samples made using 2,4-toluene diisocyanate yielded slopes less than 3.5. The highly branched samples yielded slopes well above 3.5. The moduli increased rapidly with reaction time and then levelled off. In the absence of 1,2,3-propantriol, the loss modulus surpassed the storage modulus. When 1,2,3-propantriol was added, the moduli increased more rapidly, levelled off at higher values, and the storage modulus exceeded the loss modulus. Studies of the swelling of the final product showed that these measurements yielded abnormally high values for the molecular weight between crosslinks; evidence of poor network formation." @default.
• W2094426791 created "2016-06-24" @default.
• W2094426791 creator A5039893724 @default.
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• W2094426791 date "1981-02-01" @default.
• W2094426791 modified "2023-10-16" @default.
• W2094426791 title "Study of the curing of a polyurethane using the Weissenberg Rheogoniometer" @default.
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• W2094426791 doi "https://doi.org/10.1002/pen.760210305" @default.
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