Premium
Estimation of the degree of fusion of rigid PVC from thermal analysis measurements
Author(s) -
Teh J.W.,
Rudin A.,
Cooper A.A.,
Batiste J.L.H.
Publication year - 1989
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19890290110
Subject(s) - degree (music) , endotherm , endothermic process , measure (data warehouse) , fusion , thermodynamics , materials science , mathematics , chemistry , physics , computer science , acoustics , differential scanning calorimetry , philosophy , linguistics , adsorption , database
PVC that has been processed exhibits two endothermic peaks in DSC heating curves. These endotherms are separated by a temperature. Tc, which is characteristic of the maximum temperature reached in prior processing. The relative value of the lower temperature endotherm has been proposed as a measure of degree of gelation of unplasticized PVC. This measure is not exact, however, because it does not reflect the extent of breakdown of primary PVC particles. An alternative DSC measurement technique is proposed that reflects the degree of fusion more accurately. The nature of the various endotherms that are observed is a subject of speculation in this article.