Journal
POLYMER DEGRADATION AND STABILITY
Volume 82, Issue 1, Pages 81-88Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0141-3910(03)00165-4
Keywords
PMMA degradation; activation energy; blocking effect
Categories
Ask authors/readers for more resources
The thermal degradation of poly(methyl methacrylate) was studied using a system of thiols as initiators. Depolymerization is the dominant reaction in the thermal degradation of such polymers, according to thermal analysis. The degradation mechanism involves only main-chain scission. Three methods of degradation were applied to elucidate the thermal degradation behaviour. The activation energy for the degradation of PMMA-thiols is 170 kJ/mol, higher than that of PMMA-AIBN (60 kJ/mol), as measured by the Flynn method. According to Ozawa's method, the activation energy is 210 kJ/mol higher than that of an AIBN-initiated polymer (148-151 kJ/mol). By Kissinger's measurement method, this system has a frequency factor (similar to10(10)) five orders of magnitude higher than the ordinary PMMA (similar to10(5)). The observed results are explained as a blocking effect. (C) 2003 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available