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Polyurethanes. II. Effect of cis-trans isomerism on properties of polyurethanes

✍ Scribed by Lyman, D. J.

Book ID
104531981
Publisher
John Wiley and Sons
Year
1961
Weight
594 KB
Volume
55
Category
Article
ISSN
0022-3832

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✦ Synopsis

Abstract

The cis and trans isomers of 1,4‐cyclohexanediol and 1,4‐cyclohexanedimethanol were reacted with methylene bis(4‐phenyl isocyanate), using solution polymerization techniques, to form the corresponding cis and trans polyurethanes. The properties shown by these polyurethanes indicate that enhanced flexibility due to inclined rotating bonds is responsible for differences in polymer melting points. The polymer chain shape, or configuration, has also been shown to influence the polymer properties. This approach has been extended to include differences in polymer solubilities, molecular weight/inherent viscosity ratios, initial modulus, and water absorption.

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Effects on properties of varying the cis
Effects on properties of varying the cis/trans isomer distribution in polyurethane elastomers made with 1,4-cyclohexane diisocyanate
✍ Michael D. Joseph; Michael R. Savina; Robert F. Harris πŸ“‚ Article πŸ“… 1992 πŸ› John Wiley and Sons 🌐 English βš– 858 KB

Polyurethane elastomers have been made using 1,4-cyclohexane diisocyanate ( CHDI) ,1,4butanediol (BDO) and a 2000 M , polyether diol soft segment. The cisltrans isomer distribution of the CHDI was varied between 23% and 100% trans. This variation in isomer distribution had significant effects on the