ISSN:
0098-1273
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Difficulty in controlling and determining the structural parameters of polymer networks has hindered experimental studies on the glass transition in crosslinked polymers. A series of wellcharacterized networks of poly(propylene glycol) having narrow network chain-length distributions and average molecular weight between crosslinks Mc in the range of 425-3000 has been prepared. The glass transition temperatures Tg of these networks were found to vary linearly with Mc-1, consistent with several theoretical treatments. Both the physical crosslinking and the incorporation of crosslinking agent into the system (a “copolymer” effect) are shown to be responsible for increase in Tg upon crosslinking in this system.Varying the network chain-length distribution without changing Mc did not affect the Tg of the system. The chemical nature of the crosslinking agent, however, does affect the Tg of the network, particularly at high crosslink densities.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1983.180211203
