Open AccessInfluence of air content on thermal degradation of poly(ethylene terephthalate)
Author(s) -
Wojciech Rejmer
Publication year - 2021
Publication title -
technical sciences
Language(s) - English
Resource type - Journals
eISSN - 2083-4527
pISSN - 1505-4675
DOI - 10.31648/ts.7069
Subject(s) - materials science , poly ethylene , ethylene , degradation (telecommunications) , hydrostatic pressure , composite material , atmospheric pressure , evaporation , thermal decomposition , accelerated aging , surface roughness , modulus , decomposition , chemistry , organic chemistry , meteorology , thermodynamics , telecommunications , physics , computer science , catalysis
The aim of these research is to investigate the air content on aging of poly(ethylene terephthalate) (PET) preforms. Three air pressures were selected and in each pressure 5 samples were aged during 21 days in 80oC. Three samples were selected to cut and measure their density with the use of hydrostatic method. Sample mass, Young modulus and surface roughness were measured for each sample before and after aging and differences between those parameters were presented as results. The changes of parameters may lead to a conclusion that mechanism of polymeric chain oxidation is dominant during thermal aging of PET. However the aging is not the fastest in atmospheric pressure but in lower air contents. This effect may be caused by greater evaporation of small molecule degradation products and shifting of reaction equilibrium in the direction of further decomposition.