TITLE

Dynamic-mechanical and light scattering study of the glass transition of poly(vinylacetate) and a poly(vinylacetate) +poly(4-hydroxystyrene) blend

AUTHOR(S)
Luengo, Gustavo; Ortega, Francisco; Rubio, Ramón G.; Rey, Antonio; Prolongo, Margarita G.; Masegosa, Rosa M.
PUB. DATE
February 1994
SOURCE
Journal of Chemical Physics;2/15/1994, Vol. 100 Issue 4, p3258
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The dynamics of poly(vinylacetate) (PVAc) and of a blend of PVAc and 20% in weight of poly(4-hydoxystyrene) have been studied in the glass transition region using dynamic-mechanical and photon-correlation spectroscopies. Both kinds of data show the overlapping of the main α relaxation with a faster one. The complex part of the elastic modulus shows the existence of a β’ sub-Tg transition overlapping with the α one in the high-frequency region. The light scattering data show some degree of overlapping of the α and β transitions. As a consequence, at least two Kohlraush–Williams–Watts terms are needed to describe the relaxation functions. The results show a good agreement with the predictions of the mode coupling theory except for the fact that the calculated critical temperature seems to be lower than the calorimetric glass transition temperature.
ACCESSION #
7631182

 

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