Preparation of photopolymerized nanocomposites through intercalating multifunctional acrylated siloxane into montmorillonite
Applied Clay Science(2014)
摘要
The multifunctional acrylate-intercalated montmorillonite (TA-Mt) was prepared by intercalating the cetyltrimethyl ammonium bromide (CTAB)-modified Mt (CTAB-Mt) with a trifunctional acrylated siloxane (TAS). The TA-Mt was further formulated with epoxy acrylate and 1,1,1-propanetrimethanol tris(3-mercaptopropionate) (PTTM) in an equimolar ratio of thiol group to acrylate double bond, and a trace amount of 0.5wt.% photoinitiator. This formulation was then exposed to UV light to form the polymer/Mt nanocomposites through the thiol-ene click reaction. The FT-IR, XRD, and TGA analysis confirmed the successful grafting of TAS to the Mt interlayers. The TEM and HR-TEM micrographs together with further XRD measurement indicated that the UV-cured nanocomposites possess an intercalated structure. The TGA and DMA analyses demonstrated the better thermal stability and excellent compatibility. The Tg increased with the TA-Mt content increasing in the nanocomposites.
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关键词
Montmorillonite,Thiol-ene chemistry,Nanocomposites,UV curing
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