The kinetics and mechanisms of the thermal degradation of poly(methyl methacrylate) studied by thermal analysis-Fourier transform infrared spectroscopy

被引:186
作者
Holland, BJ [1 ]
Hay, JN [1 ]
机构
[1] Univ Birmingham, Sch Met & Mat, Plast Mat Lab, Birmingham B15 2TT, W Midlands, England
关键词
poly(methyl methacrylate); thermal analysis-Fourier transform infrared spectroscopy; thermal degradation;
D O I
10.1016/S0032-3861(00)00923-X
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The kinetics and mechanisms of thermal degradation of poly(methyl methacrylate) (PMMA) have been studied to demonstrate the usefulness of thermal analysis-Fourier transform infrared spectroscopy (TA-FTIR) as a qualitative and quantitative kinetic tool to study the thermal degradation of polymers. From the dependence of the rate of thermal degradation of PMMA on molecular weight at low degradation temperatures, it was concluded that thermal degradation was initiated by a mixture of chain end and random chain scission initiation, followed by depropagation and first-order termination. Random scission is attributed to pre-oxidation of the polymer on storage at room temperature. At higher temperatures, a change in molecular weight dependence was observed, related to depropagation to the end of the polymer chain. The thermal degradation of PMMA also leads to the production of char, which was produced by the elimination of methoxycarbonyI side-chains. The amount of char produced increased with increasing concentration of end-groups and temperature. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:4825 / 4835
页数:11
相关论文
共 12 条
[1]  
Atkins P.W., 1990, PHYSICAL CHEM, P938
[2]   THE THERMAL DEGRADATION OF POLYVINYL COMPOUNDS .1. A NEW TYPE OF MOLECULAR STILL [J].
GRASSIE, N ;
MELVILLE, HW .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1949, 199 (1056) :1-13
[3]  
Holland BJ, 2000, POLYM INT, V49, P943, DOI 10.1002/1097-0126(200009)49:9<943::AID-PI400>3.0.CO
[4]  
2-5
[5]   POLYMER DEGRADATION MECHANISMS - NEW APPROACHES [J].
LEHRLE, R ;
ATKINSON, D ;
COOK, S ;
GARDNER, P ;
GROVES, S ;
HANCOX, R ;
LAMB, G .
POLYMER DEGRADATION AND STABILITY, 1993, 42 (03) :281-291
[6]  
LEHRLE RS, 1982, EUR POLYM J, V18, P517, DOI 10.1016/0014-3057(82)90054-4
[7]   THERMAL-DEGRADATION OF SATURATED POLY(METHYL METHACRYLATE) [J].
MANRING, LE .
MACROMOLECULES, 1988, 21 (02) :528-530
[8]   THERMAL-DEGRADATION OF POLY(METHYL METHACRYLATE) .2. VINYL-TERMINATED POLYMER [J].
MANRING, LE .
MACROMOLECULES, 1989, 22 (06) :2673-2677
[9]   THERMAL-DEGRADATION OF POLY(METHYL METHACRYLATE) .4. RANDOM SIDE-GROUP SCISSION [J].
MANRING, LE .
MACROMOLECULES, 1991, 24 (11) :3304-3309
[10]   THERMAL-DEGRADATION OF POLY(METHYL METHACRYLATE) .3. POLYMER WITH HEAD-TO-HEAD LINKAGES [J].
MANRING, LE ;
SOGAH, DY ;
COHEN, GM .
MACROMOLECULES, 1989, 22 (12) :4652-4654