Absorption properties, molecular glasses

This paper is devoted to the presentation of a brief overview of a recently-developed "relaxation-localization" model of localized molecular-ion and exciton states in polymers and molecular glasses. This model was proposed initially to interpret photoemission measurements from two pgn ant-group polymers polystyrene and p ly(2-vinyl pyridine.) It ext was utilized in the prediction and subsequent observation of surface states of molecular solids as well as of the temperature dependence of photoe iss on and UV absorption linewidths of molecular films. Having proven successful in describing the spectroscopic properties of typical pendant-group polymers and molecular glasses, the model most recently has been extended to provide a description of electron-transfer processes in both these materials and molecularly-doped polymers. Therefore it affords a unified and experimentally-verified microscopic description of electron ionization, excitation and transfer processes in a variety of molecular and polymeric materials. 

In the above table, Mj, Vi, Yj and Hj are the contributions for group i for estimating the molecular weight, the molar volume, the glass-transition temperature, and the water absorption, respectively. The model equations for each of these properties are as follows ... 

Radical I". The purpose of polymerizing vinyl chloride under a variety of conditions was to prepare polymers with a wide range of branching, and molecular weight. The ESR spectra of all PVC glasses, however, exhibited the same six line absorption at LNT. This seems to indicate that the variation of the above properties in the present case did not affect the degradation process of PVC appreciably. 

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