ISSN:
0887-6266
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The effect of the length of side chains on the optical configuration parameter Δa of poly(n-alkyl acrylate) networks was theoretically studied using the valence optical scheme (VOS). The theoretical calculations suggest that Δa should be negative, and its absolute value should increase as the side-chain length increases. Moreover, a positive temperature dependence is also predicted. By comparing theoretical and experimental results, it was found that the valence optical scheme gives a good qualitative interpretation of the side-chain effects on the birefringence of the stretched networks. However, the method fails to give a quantitative description of Δa, presumably because strong intermolecular interactions enhance the polarizability along the chains. The fact that the difference between theoretical and experimental values of Δa decreases with increasing side-chain length suggests that flexible long chains act as a diluent reducing intermolecular interactions that enhance Δa.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/polb.1989.090270402
