Preparation of nanometer dispersed polypropylene/polystyrene interpenetrating network using supercritical CO2 as a swelling agent |
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Authors: | Dan LiZhimin Liu Buxing Han Liping SongGuanying Yang Tao Jiang |
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Affiliation: | Center for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080, People's Republic of China |
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Abstract: | Nanometer dispersed polypropylene/polystyrene (PP/PS) interpenetrating networks (IPNs) have been prepared by the radical polymerization and crosslinking of styrene (St) within supercritical (SC) CO2-swollen PP substrates. In this method, monomer St, crosslinking agent divinyl benzene (DVB), and the initiator benzoyl peroxide were first impregnated into PP matrix using SC CO2 as a solvent and swelling agent at 35.0 °C, and then the polymerization and crosslinking were carried out at 120 °C. The composition of the IPNs can be controlled by SC CO2 pressure, concentrations of St and DVB in the fluid phase. Transmission electron microscopy shows that the PS is homogeneously dispersed in the IPNs and its phase size is in the range of 20-30 nm. The impact strength, tensile strength, and elongation-at-break of the PP/PS IPNs increase with increasing PS percentage in the IPNs. |
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Keywords: | Polypropylene/polystyrene interpenetrating network Supercritical CO2 Swelling agent |
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