ISSN:
1436-2449
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Summary The glass transition temperature-composition dependence for the systems PVC-dimethylphthalate and PVC-di-n-propylphthalate has been determined in the whole range of concentration. The glass transition temperature of the mixtures decreases with increasing diluent content and in both cases shows a discontinuity at a critical composition (w1≃0.4). At diluent weight fractions lower than 0.4, the theoretical equations by Kelley-Bueche and CouchmanKarasz satisfactorily fit the experimental results. The marked changes in the glass transition parameters (Tg, Δcp, width of the transition) which occur in the intermediate range of concentration (0.4〈w1〈0.6), although difficult to visualize in physical terms, indicate an enhanced mobility of the relaxing units. Moreover, the properties of the mixtures in the high diluent concentration range seem to be dictated by the properties of the pure diluent.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00255169
