Effect of Silica on Sherulite Structure and Photo-oxidative Degradation Behavior in Polypropylene/Silica Nanocomposites

概要

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The physico-chemical interaction between hydrophobic polyolefin materials and originally hydrophilic inorganic nano-particles like surface hydroxylated SiO_2 has not been well understood up to now. In this study, the influences of particle size, content of hydrophilic SiO_2 nanoparticles on the isothermal growth rate of polypropylene (PP) spherulites in various PP/SiO_2 nanocomposites were investigated by polarized optical microscope equipped with temperature controlled hot stage. Moreover, photo-oxidative degradation behavior of the PP/ SiO_2 nanocomposites were investigated. It is most interesting to note that the addition of smaller SiO_2 nanoparticles effectively lowered the growth rate of PP spherulites in the composites and the spherulite growth rate became zero for the PP/16nm-SiO_2 nanocomposites with the SiO_2 content above 2.5 wt%. It was found that the sample without spherulite morphology is more stable to photo-degradation. Spherulite structure is considered to have the influence affect photo-oxidative degradation.
マテリアルライフ学会の論文
2007-07-31