Effect of silica-admixtures of various surface natures on the structure formation in the polypropylene/copolyamide system
Анотація
Using viscosimetry, optical microscopy with statistical treatment of images of microstructures and differential thermal analysis techniques, influence of nanodimensional silica of modified surface with hydroxyl and methyl groups on rheological properties and structure-forming processes at melt flow of polypropylene/copolyamide blend were studying. It is established, that nanodimensional silicas having influence on parameters of melting and crystallization of extrudates of polymer blends. It is shown, that nanodimensional silica with surface grafted dimethyl groups is more effective, than non – modyfying one, in fiber-forming processes at the expense of his surface affinity with polypropylene. The optimal compositions of blends and conditions of extrusion at production of polypropylene microfibers with improved characteristics were founded. One concluded, that introduction of nanodimensional silicas in blend of polypropylene/copolyamide is effective method of fiber – forming process regulation
Посилання
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