ISSN:
0887-624X
Keywords:
topochemical polymerization
;
radical polymerization
;
molecular weight control
;
solid-state photoreaction
;
diethyl muconate
;
microcrystals
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The molecular weight and its distribution of the resulting polymers were investigated during the crystalline-state photopolymerization of diethyl cis,cis-muconate (EMU). EMU crystals were prepared by several methods, recrystallization, milling, freeze drying, and precipitation, to obtain the crystals with various sizes of 10-6 to 10-2 m. After crystalline-state photopolymerization via a crystal-to-crystal process, polymer crystals were isolated and characterized by optical microphotography and scanning electron micrography. Molecular weight and its distribution were determined by gel permeation chromatography with 1,1,1,3,3,3-hexafluoro-2-propanol and by intrinsic viscosity in trifluoroacetic acid. It was revealed that the size of the EMU crystals depended on the method used for the crystal preparation, and that the molecular weight of the polymer decreased as the crystal size became small. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 3147-3155, 1998
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
