Premium
Comparison of dynamic and static degradation of poly(vinyl chloride)
Author(s) -
Pukánszky Béla,
Nagy Tibor T.,
Kelen Tibor,
Tüdõs Ferenc
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070270730
Subject(s) - vinyl chloride , degradation (telecommunications) , materials science , rheology , chloride , mixing (physics) , chemical engineering , polymer chemistry , composite material , polymer , copolymer , metallurgy , telecommunications , physics , quantum mechanics , computer science , engineering
The thermal degradation of PVC was measured under dynamic and static conditions. The UV and IR spectra, as well as the molecular weight distribution of the PVC samples, taken after different time intervals were measured. It was established that during the dynamic PVC degradation, performed in a mixing chamber, two stages with different degradation rates can be distinguished both in extinction and torque vs. time curves. While oxygen does not, dissolved HCl does play an important role in the dynamic degradation: HCl steps into reaction with the formed polyenes and has a catalytic action. The chemical degradation, particularly the crosslinking, produces the changes in the rheological behavior of the material. Results were compared with those obtained under static conditions in argon, air, and HCl atmosphere.