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Degradation of poly(methyl methacrylate) (PMMA) with aluminum nitride and alumina
Author(s) -
Lee YiMu,
Viswanath Dabir S.
Publication year - 2000
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11366
Subject(s) - activation energy , thermogravimetric analysis , materials science , methyl methacrylate , arrhenius equation , poly(methyl methacrylate) , diffusion , composite material , isothermal process , degradation (telecommunications) , arrhenius plot , nitride , polymer , chemical engineering , polymerization , organic chemistry , thermodynamics , chemistry , telecommunications , physics , layer (electronics) , computer science , engineering
This paper deals with the thermal and thermal‐oxidative degradation of pure poly(methyl methacrylate) (PMMA), PMMA/A1N and PMMA/Al 2 O 3 composites. Kinetic parameters were determined from the weight loss data using non‐isothermal Thermogravimetric Analysis (TGA). The amount and morphology of the carbon residue in the burnt samples under N 2 and air atmospheres were also investigated using a Leco combustion analyzer. This study also showed that the normally accepted three‐stage polymer thermal degradation, and hence three regions of Arrhenius linearity, can be treated with one value of activation energy. This is a basic departure from the normally accepted three different regions and applying the same diffusion equation (such as Jander diffusion) separately to each region. In nitrogen atmosphere, the activation energy of pure PMMA was 129.4 kJ/mol; however, the activation energies of 14% PMMA/AlN and PMMA/Al 2 O 3 were found to be 119.5 and 118.2 kJ/mol, respectively.