ISSN:
0887-624X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Optically active β-(1,1-dichloroethyl)-β-propiolactone (CH3CCl2-PL), β-(1,1-dichloropropyl)-β-propiolactone (C2H5CCl2-PL), and β-(1,1-dichlorobutyl)-β-propiolactone (C3H7CCl2-PL) were synthesized with enantiomeric excesses of 100, 100, and 84%, respectively. Polymerization was conducted in bulk and toluene solution, under vacuum, using mainly ZnEt2/H2O as initiator. Osmometry analyses indicate molecular weights in the range 10,000-25,000. The polymers thus prepared are semi-crystalline and show large optical rotation values.13 C-NMR was used to show that they have a high degree of isotacticity, indicating that little or no racemization occurs in the course of polymerization. Glass transition, melting and decomposition temperatures are given as a function of the size of the substituent, and their variations are discussed.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pola.1986.080241107
