RAMAN STUDY OF MACROSCOPIC AND BOND STRAIN EFFECTS IN AN EXTENDED CHAIN POLYMER
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Date
1975
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The Raman spectra of single crystalline fibers of the polydiacetylene, poly HDU, formed by the solid-state polymerization of $R-C\equiv C-C\equiv C-R$, where R is ($C_{6}H_{6})-NH-CO-O-CH_{2}-$, are reported as a function of tension. The vibrational bands attributable to $\nu(C\equiv C$) and $\nu(C\equiv C$) both shift linearly to lower frequencies with applied tensional strain, but they shift to different extents. For example, the value of $\nu(C\equiv C$) is lowered about 30cm $^{-1}$ for a tensile strain of 1.5\%. The relationship between the macroscopic forces and the molecular bond forces, reflected in the spectra, is developed for this extended-chain, electron-delocalized polymer.
Description
Author Institution: Department of Chemistry, Brown University; Department of Chemistry, Allied Chemical Corporation