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Use of expanded‐EPDM as protecting layer for moderation of photo‐degradation in wood/NR composite for roofing applications
Author(s) -
Yamsaengsung W.,
Sombatsompop N.
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.31256
Subject(s) - materials science , composite material , natural rubber , ultimate tensile strength , layer (electronics) , composite number , thermal stability , epdm rubber , chemical engineering , engineering
Changes in tensile properties, sample size, interfacial strength, and thermal conductivity of melt‐laminating layers of wood/ebonite natural rubber (NR) and expanded ethyelene–propylene diene rubber (EPDM) for polymeric roofing applications were monitored under a period of UV aging times for 60 days, the results being compared with single rubber layers of wood/NR and expanded‐EPDM. The experimental results suggested that the tensile modulus of the wood/NR‐EPDM melt‐laminating layer increased with increasing aging time. The tensile strength of the wood/NR layer decreased after prolonged UV aging, and positioned between that of the wood/NR and expanded‐EPDM layers. The sample size reduction of wood/NR layer with expanded‐EPDM top coating layer was lower than that for wood/NR single layer. The peel strength of the wood/NR‐EPDM melt‐laminating layer was found to decrease with increasing UV aging time as a result of delamination of the rubber layers. The thermal conductivity of the wood/NR‐EPDM melt‐laminating layer decreased from 0.085 to 0.070 W/m K with increasing aging times upto 40 days, but tended to increase to 0.080 W/m K at the aging time of 60 days. The experimental results in this work clearly suggested that expanded‐EPDM could be used as protecting layer, not only for moderation of photo‐oxidative degradations of wood/NR layer for roofing application, but also for minimization of dimension changes of the wood/NR‐EPDM melt‐laminating layer. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010