Morphology, thermal behavior, rheological, and mechanical properties of polypropylene/polystyrene blends based on elongation flow

Abstract

Binary blends comprised of polypropylene (PP) and polystyrene (PS) were prepared by a novel eccentric rotor extruder based on elongation flow. The morphology, thermal behavior, rheological and mechanical properties were investigated. As the enhanced mixed dispersion based on the novel extruder, the dispersed PS phase were uniformly dispersed in the PP matrix when the PS not more than 40%, and a distinct cocontinuous phase structure emerged when the PS content was 50%. The size of the dispersed PS phase related to the PS content and the processing flow filed influenced the crystallization behavior and the thermal stability of the blends. The PS droplet with small size could act as a nucleating agent for PP to improve the crystallinity, and PS droplet with large size could promote the thermal and heat transfer between the PS droplets and PP matrix which decreased the thermal stability. The rheological results showed that the compounding with PS into the PP matrix increased the storage and loss modulus as well as the complex viscosity of the materials. When the PS content not more than 20%, the blends showed good impact resistance, and PP/PS blends 30% PS showed good tensile and flexural properties. This study gives a new perspective for the structure and properties of the binary PP/PS blends prepared based on elongation flow.

Application of Physical Methods for the Detection of a Thermally Degraded Recycled Material in Plastic Parts Made of Polypropylene Copolymer

“…The increase in values is logical in this case, because the degradation of the material means cleavage and shortening of the macromolecular chains, which results in an increase in the material’s fluidity. This behavior was in agreement with data observed by Gadgeel et al [ 22 ] and Chen et al [ 23 ].…”

Reactive processing of PA6/EPDM‐MA blends as modifier for application and development of high‐performance polypropylene

“…In addition, it is a quite low-cost process in comparison to the new polymer synthesis processes. [7][8][9] PP can be toughened through the addition of elastomers as a dispersed phase, which is an economically viable solution that offers highly satisfactory results in impact strength. [10] Blending PP with olefin elastomers, such as ethylene-propylene-diene (EPDM), ethylenepropylene (EPR), and styrene-ethylene-butylene-styrene (SEBS), have been the most common impact modifiers rotes.…”

Impact of hybrid nanofillers on the structure and property of polypropylene/polystyrene composites based on elongation flow

“…As a typical immiscible polymer system, the PP/PS blend has been studied extensively. The morphology and morphology evolution, rheological property, mechanical and electrical properties of PP/PS blends and modified composites have been investigated 5–8 . A number of compatibilizers have been applied to improve the interface interaction of PP/PS blend, such as benzoyl peroxide and maleic anhydride, 9 PP‐g‐MAH, 10 propylene‐co‐styrenic monomer copolymers, 11 PP‐g‐PS copolymer, 12 PS‐block‐poly(ethylene‐butylene)‐block‐PS copolymers 13 and nanoparticles 14–16 …”

“…For PP/PS, the typical immiscible polymer blend, the morphology, thermal behavior, rheological, and mechanical properties of the blend based on elongation flow had been investigated in previous study 6 . Three kinds of nanofillers with different dimensions, including zero‐dimensional nanosphere titanium dioxide (TiO 2 ), one‐dimensional multi‐walled carbon nanotubes (MWCNTs), and two‐dimensional nanoplate montmorillonite (MMT), were filled into the PP/PS blend respectively for preparing the PP/PS based nanocomposites by eccentric rotor extruder 21 .…”