ISSN:
0360-6376
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Reaction of pentaerythritol (1) or dipentaerythritol with caprolactone yields prepolymers of the general structure \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm C} { \left( {\rm CH}_2 {\rm OH} \right)_4 } \hbox{--} {\rm i} \left [ {\rm CH}_2 {\rm O} \left( {\rm COCH}_2 {\rm CH}_2 {\rm CH}_2 {\rm CH}_2 {\rm CH}_2 {\rm O} \right)_{\rm n} {\rm H} \right]_{\rm i}$$\end{document} for i = 1, 2, 3, and 4 (2)-(5). The 13C chemical shifts of the quaternary carbons in (1)-(5) differ by more than 0.5 ppm. Conditions were determined to obtain quantitative intensity ratios of these carbons. The relative intensities give the distribution of the various branched structures and permit calculations of the average number of caprolactones per branch. Results are reported for caprolactone/polyol mole ratics of 3-66.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1981.170190605
