Method for separating intramolecular and intermolecular interactions which influence polymer glass temperatures
✍ Scribed by Donald P. Wyman
- Publisher
- John Wiley and Sons
- Year
- 1967
- Tongue
- English
- Weight
- 498 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
It is shown that the glass temperature (T,) for homopolymers of the type 4 H p CXYcan be expressed by a simple additive equation involving two terms: (1) a parameter E which is directly related to the molar cohesion energy and (9) a parameter E.* which is a measure of restricted rotation about valence bonds. E.*, a t least for a large number of polymers, is related to the Mark-Houwink KB value (as measured in e solvents a t To) via anti-log E,* a l/K;Ia. It is also shown that for homologous series (e.g., poly(n-alkyl methacrylates)), there is a constant relationship between E and antilog E,*. The T, values for copolymers may be estimated by a simple weighted (via mole fraction) summation of the E and E,* values of the components. When used in this form, a linear variation between T, and composition is assumed, which may not be strictly correct but still yields useful approximations.