Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23270
Title: Effect of atmosphere on the thermal decomposition of chlorinated natural rubber from latex
Authors: Li, SD
Cheung, MK
Zhong, JP
Yu, HP
Keywords: Chlorinated natural rubber
Elastomers
Natural rubber latex
Thermal decomposition
Thermal properties
Thermogravimetric analysis
Thermooxidative decomposition
Issue Date: 2001
Publisher: John Wiley & Sons
Source: Journal of applied polymer science, 2001, v. 82, no. 10, p. 2590-2598 How to cite?
Journal: Journal of applied polymer science 
Abstract: The kinetics of the thermal decompositions of chlorinated natural rubber (CNR) from latex under both air and nitrogen atmospheres were studied with thermogravimetric analysis (TGA). The thermooxidative decomposition of CNR had two weight-loss step changes in the TGA curves, which occurred at the two distinct temperature ranges of about 160-390 and 390-850°C, respectively. The gaseous products of the first step change were mainly HCl with a little CO2, and the apparent reaction order (n) was 1.1. The reaction activation energy (E) increased linearly with the increment of heating rate (B), and the apparent activation energy (E0), calculated by extrapolation back to zero B, was 101.7 kJ/mol. Bs ranging from 5 to 30°C/min were used. The initial temperature of weight loss (T0) was 1.31B + 252°C, where B is in degrees Celsius per minute. The final temperature of weight loss (Tf) was 0.93B + 310°C, and the temperature of maximum weight-loss rate (Tp) was 1.03B + 287°C. The decomposition weight-loss percentage at Tp (Cp) and that at Tf(Cf) were not affected by B, and the average values were 38 and 60%, respectively. The second weight-loss step change was an oxidative decomposition of the molecular main chain. The value of n was 1.1. E increased linearly with the increment of B, and E0 was 125.0 kJ/mol. Cf after the second step approached 100%, which indicated complete decomposition. The thermal decomposition of CNR in a N2 atmosphere had only one weight-loss step change with an n of 1.1. E increased linearly with the increment of B, and E0 was 98.6 kJ/mol. T0 was 1.25B + 251°C, Tf was 0.91B + 315°C, and Tp was 1.09B + 286°C. Cp and Cf were not affected by B, and the average values were 37 and 68%, respectively. The weight percentage of more stable, nonthermal decomposed residue was about 30%. The thermal decompositions of CNR in both atmospheres were similar, mainly by dehydrochlorination, at the low temperature range (160-390°C) but were different at the high temperature range (390-850°C).
URI: http://hdl.handle.net/10397/23270
ISSN: 0021-8995
EISSN: 1097-4628
DOI: 10.1002/app.2110
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