Affiliations: Institut für Energieverfahrungstechnik und
Chemieingenieurwesen, TU Bergakademie Freiberg, 09599 Freiberg, Germany | Deutsche Solar AG, Alfred-Lange-Str. 18, 09599
Freiberg, Germany
Note: [] Corresponding author: Actual address: School of Chemistry and
Chemical Engineering, Hunan University, Changsha 410082, China. E-mail:
dewenzeng@21cn.com
Abstract: The basic pyrolysis behaviour of ethylene vinyl acetate (EVA)
copolymer, which is often used as a lamination agent in solar modules, was
investigated in thermogravimetry, differential thermal analysis (DTA) and
thermovolumetry. The TG analysis showed that the EVA pyrolysis can be
accelerated under the partial oxidizing atmosphere but the end pyrolysis
temperature must be higher than in nitrogen, to eliminate the coke formed.
Meanwhile, a strong exothermal peak occurs at about 450°C under the air
condition and gets weaker obviously at the oxygen content lower than 10 vol.%.
The mass balance of EVA pyrolysis was given through thermovolumetry with the
output of 10 wt.% permanent gas, 89.9 wt.% condensate and 0.1% residual coke.
Besides, the composition of the permanent gas and condensate at different
pyrolysis stages were analysed and interpreted on the known pyrolysis
mechanism.
