Preparation of polypropylene/glass fiber foam composite and its sound and thermal insulation properties
Using tripropylene glycol diacrylate(TPGDA)and styrene(St)as comonomers,dicumyl peroxide(DCP)as initia-tor,glass fiber(GF)as filler,the polypropylene(PP)/GF foam composites were prepared by melt blending technology and die-pressing foaming technology.The branched structures of TPGDA-St copolymer long-chain on the PP molecule were formed by melt grafting,and were used as compatilizer to promote the dispersion of GF in the PP matrix.Properties of the PP melt and the foam composite were enhanced effectively via the synergistic effect of glass fiber and the branched structures of TPGDA-St copolymer long-chain.The effects of the branched structures as compatilizer and the filler content on the melt strength,the heat stability,the crystallization behavior of the PP and the microstructure,the sound and thermal insulation properties,the mechanical property were studied.The results show that the branched structures of TPGDA-St copolymer long-chain as compatilizer are beneficial to the dispersion of GF in the PP matrix,the reinforcement of the interfacial interaction,the formation of the more perfect filler network,and the improvement of the PP's melt strength,foaming properties and crystallization behavior.When the GF content is 10 phr,the PP/GF foam composite has uniform cells with regular shape and shows good compressive mechanical property.Moreover,its sound and thermal insulation properties are excellent,and its average sound transmission loss(59.7dB)increases by 64%and thermal conductivity[0.055 W/(m·K)]decreases by 65.6%compared with pure PP foam,respectively.
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