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N. M. Rezanova, V. P. Plavan, L. S. Dzubenko, O. O. Sapyanenko, P. P. Gorbyk, and A. V. Korshun
«The Structure Formation in Compatibilized and Nanofilled Melts of Polypropylene/Plasticized Polyvinyl Alcohol»
PACS numbers: 62.25.Mn, 64.75.Va, 78.40.Me, 81.05.Lg, 82.35.-x, 82.70.Dd, 83.80.Tc
The influence of nanodisperse addition of silver/silica, sodium oleate as compatibilizer, and their binary blends on morphology and melt flow of thermodynamically incompatible blends of polypropylene/polyvinyl alcohol (PP/PVA) is studied. Application of above-mentioned additives gives ability to manage fibre-forming process of PP in PVA matrix in the direction of both increasing the microfibres mass part, and decreasing the average diameter. The maximal improvement of matrix–fibrillar structure is achieved during simultaneous application of both modifiers that is caused by amplification of compatibility effect on interphase boundary layer due to nanodisperse additive. The value of surface tension decreases from 0.73 mN/m of pure blend to 0.24 mN/m in four-phase composition. The nucleating action of nanoparticles, plasticizing effect of sodium oleate, and reinforcing in specific interactions between components in phase-boundary layer have influence on phase transitions in modified systems and are promoting in formation of more thin microfibres. Mechanical characteristics of composite monothreads are correlated with blend morphology as well as with microstructure of extrudates. The higher values of tensile strength and deformation stability are manifested by threads, where microfibres are prevailing structure type, and whose diameters are minimal. Rheological properties and uniaxial-tension ability of studied compositions are determined by phase heterogeneity. The anisotropic structure formation for PP in a matrix component causes an abrupt decrease of effective viscosity for melts of modified blends.
Keywords: blends, nanoaddition, compatibilizer, morphology, viscosity
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