Poly , physical aging, enthalpy

Cowie, J.M.G. and Ferguson, R. Physical aging studies in poly (vinyl methyl ether). 1. Enthalpy relaxation as a function of aging temperature. Macromolecules, 22, 2307,1989. 

Cowie, J. M. G., and Ferguson, R., Physical ageing of poly(methyl methacrylate) from enthalpy relaxation measurements. Polymer, 34, 2135-2141 (1993). 

Cowie, J. M. G., Harris, S., and McEwen, 1. J., Physical aging in poly(vinyl acetate) 2. Relative rates of volume and enthalpy relaxation. Macromolecules, 31, 2611-2615 (1998b). 

Mijovic, J., and Kwei, T. K., Physical ageing in poly(methyl methacrylate)/poly(styrene-co-acrylonitrile) blends II. Enthalpy relaxation, Polym. Eng. ScL, 29,1604—1610 (1989). 

Cowie, J. M. G., Elliott, S., Ferguson, R Simha, R Physical aging smdies on poly(vinyl acetate) - enthalpy relaxation and its relation to volume recovery. Polymer Communications, 28(11), pp. 298-300 (1987). 

In the present research, variables associated with physical aging near the alpha transition were used to examine the beta transition of a poly(amide-imide). After sample drying, the relationship between the beta transition s activation enthalpy and thermal history was explored. 

Pan, R, Zhu, B. and Inoue, Y. (2007) Enthalpy relaxation and embrittlement of poly(L-lactide) during physical aging. Macromolecules, 40, 9664—9671. 

The first comprehensive study of physical aging in a miscible blend system using enthalpy relaxation was reported by Cowie and Ferguson (1989) who followed the enthalpic relaxatirm in a series of blends of PS and poly(vinyl methyl ether), PVME. ComparisOTi of the blend behavior with that of the two components by analyzing the data oti the basis of both the P-M and C-F models led to the conclusions that the blends aged more slowly than PVME when aging was carried... 

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