Morphology and Rheology of Nanofilled PP / PVA Blends

Abstract

The influence of Ag/SiO2 as nanofiller and sodium oleate as compatibilizer and their mixtures on the patterns flow and structure formation processes in thermodynamically incompatible polypropylene/plasticized polyvinylalcohol (PP / PVA) systems were studied. It is found that the change in the sequence of mixing the ingredients of the composition allows adjusting the morphology phase type due to the predominant localization of nanoparticle additives in the melt amount of a component or on the border of phase separation. Injection of Ag/SiO2 to melt PP increases dispersion degree and homogeneity of its distribution in the matrix. Simultaneous use of nanoadditive and sodium oleate as compatibilizer improves the connections between the polymers and promotes thinner and more homogeneous dispersion of the particles of the dispersed phase. It is shown that the effective viscosity of melt nanofilled system is determined by components mixing method: viscosity of melt blend increases when the additive is localized predominantly in the PVA and decreases with the prior injection of PP. The nature of the flow for all researched compositions obeys a power law and almost does not depend on the method of mixing. The ability of the longitudinal deformation of ternary blends is deteriorating, but remains sufficient for their processing. Combining nanoadditive with compatibilizer promotes increased elasticity and the melt spinnability of modified blends.

Microstructure Evolution of Immiscible PP-PVA Blends Tuned by Polymer Ratio and Silica Nanoparticles

“…Thermoplastic polyvinyl alcohol (PVA), as polar polymer, is immiscible with PP, and it can be removed in warm water as a sacrificial phase. Nowadays, few studies of PP-PVA biphasic system [20,21,22,23] have been done, in which glycerin is introduced into PVA matrix as a plasticizer. As a matter of fact, new thermoplastic PVA can be melt-manufactured without any plasticizer.…”

“…As a matter of fact, new thermoplastic PVA can be melt-manufactured without any plasticizer. To the best of our knowledge, so far there are hardly any reports [23] concerning the morphological regulation of PP-PVA blends by adding nanofillers. Hence, the current work emphatically discusses the utilization of silica nanoparticles in tailoring the structure of PP-PVA blends.…”

Application of Ag@SiO2 nanoparticles within PVA to reduce growth of E. coli and S. aureus in beef patties

“…It is worth noting that Rezanova et al. (2017) found the order of adding materials played a critical role in the blend viscosity. The blend viscosity decreased when the material was added successively, and the viscosity increased when the material was mixed at the same time; this observation is consistent with our result.…”

Polypropylene/Poly(vinyl alcohol) Blends Compatibilized with Kaolinite Janus Hybrid Particles and Their Transformation into Fibers

“…17,7 The sacrificial polymer can even be reused for the repetitive production. 33 There were few reports 35 concerning the morphological control of PP−PVA blends by adding nanofillers. Therefore, our research group has made efforts to control the localization of isotropic silica nanoparticles within PP−PVA 32 and manufactured the materials into fibers by melt spinning.…”

“…A lot of water-soluble polymers are good candidates for the sacrificial phase, such as poly­(vinyl alcohol) (PVA), polyvinylpyrrolidone (PVP), sulfopolyester (SP), and poly­(ethylene oxide) (PEO). , The sacrificial polymer can even be reused for the repetitive production . There were few reports concerning the morphological control of PP–PVA blends by adding nanofillers. Therefore, our research group has made efforts to control the localization of isotropic silica nanoparticles within PP–PVA and manufactured the materials into fibers by melt spinning.…”