Polyolefin‐clay hybrids based on modified polyolefins and organophilic clay

Abstract

IntroductionIn recent years, organic-inorganic nanometer-composites have attracted great interest to researchers since they frequently exhibit unexpected hybrid properties synergistically derived from the two components. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] One of the most promising composite system would be hybrids based on organic polymers and inorganic clay minerals consisting of silicate layers [4][5][6][7][8][9][10][11][12][13][14][15][16][17] . In our previous works, we have synthesized nylon 6-clay hybrid (NCH) in which 1 nm thick silicate layers of clay minerals are exfoliated and homogeneously dispersed in the nylon 6 matrix. [5] The NCH exhibits various superior properties such as high strength, high modulus, and high heat resistance, compared to conventional nylon 6. [6] Since then, other polymer-clay hybrids such as polyimide, [7] epoxy resin, [8] polystyrene, [9] polycaprolactone, [10] acrylic polymer, [11] polyurethane, [12] and poly(ethylene terephthalate) [13] were reported. However, the dispersion of exfoliated silicates was achieved only in a few cases, i. e., nylon, [5,6] polyimide, [7] epoxy resin, [8] and polystyrene. [9 d, e] Polyolefins, i. e., poly(propylene) (PP), polyethylene (PE), ethylene-propylene rubber (EPR), are the most widely used polymers. However, there was few report of polyolefin-clay hybrids in which the silicate layers were exfoliated and homogeneously dispersed. It has been considered that the silicate layers of the clay have high polarity and are incompatible with polyolefins. Coates [14] and Mülhaupt [15] independently reported the in-situ olefin polymerization in the existence of organophilic clay to afford polyolefin-clay nanocomposites wherein the polyolefins were intercalated into the clay galleries. Recently, we have found polyolefin oligomers with polar functionality were intercalated into the organophilic clay galleries during melt-blending and these phenomena were the key to achieve the dispersion of exfoliated silicates in polyolefins. [16] We reported that PP and organophilic clay were melt-blended in the presence of maleic anhydride modified PP oligomer to obtained PP-clay hybrids wherein a large fraction of the clay silicates were found to be exfoliated. Since then, this system using modified PP oligomers as the compatibilizer was investigated by many researchers. [17] In this study we report a novel and general approach to prepare polyolefin-clay hybrids by using organophilic clay and maleic anhydride modified polyolefins during melt-blending and examine the morphologies and the basic properties of the hybrids. Results and discussionAll samples of polyolefin-clay hybrids were prepared by melt-blending maleic anhydride modified polyolefins and organophilic clay above each melting point. On the Full Paper: A novel and general approach to prepare polyolefin-clay hybrids by using the maleic anhydride modified polyolefins and organophilic clay during meltblending was reported. The silicate layers of the clay were exfoliated and homogen...

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