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Effects of silicon additive as synergists of Mg(OH) 2 on the flammability of ethylene vinyl acetate copolymer
Author(s) -
Huang Honghai,
Tian Ming,
Liu Li,
He Zhenhai,
Chen Zhongqiang,
Zhang Liqun
Publication year - 2005
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.22494
Subject(s) - cone calorimeter , flammability , ethylene vinyl acetate , materials science , limiting oxygen index , composite material , montmorillonite , silicone rubber , copolymer , fire retardant , vinyl acetate , composite number , natural rubber , char , pyrolysis , polymer , organic chemistry , chemistry
The present work dealt with the effects of nine kinds of silicon additives on flame retardancy of ethylene‐vinyl acetate copolymer (EVA)/magnesium hydroxide [Mg(OH) 2 ] composites, as well as mechanical properties. The limiting oxygen index (LOI) test, horizontal fire test, vertical fire test, and cone calorimeter test were employed to evaluate flame retardancy of the composites. It was found that different silicon additives had different synergistic effects with Mg(OH) 2 on flame retardancy of the EVA matrix and exerted different influences on mechanical properties of the composites. The incorporation of organic montmorillonite (MMT) clay or silicone rubber not only made the composite reach FH‐1 rating in the horizontal fire test and FV‐1 rating in the vertical fire test, respectively, but also dramatically reduced the peak rate of heat release (Peak RHR) and increased the fire performance index (FPI) and ignition time (IT). The composites filled with precipitated SiO 2 exhibited the longest IT, the highest FPI, and FV‐1 rating. However, only the composites filled with silicone rubber could attain a balance between mechanical properties and flame retardancy. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006