Ternary blends of high-density polyethylene-polystyrene-poly(ethylene/butylene-b-styrene) copolymers: Properties and orientation behavior in plane-strain compression

Abstract

Ternary blends of high-density polyethylene (HDPE) with atactic polystyrene (PS) and styrene-ethylene/butylene-styrene block copolymer (SEBS) were deformed by plane-strain compression in a channel die. The samples were deformed up to the true strain of 1.8 (compression ratio of 6) at 100°C. Thermal and mechanical properties of the deformed blends were studied in addition to the study of the deformation process. The basic mechanism of plastic deformation is crystallographic slip, the same as that active in deformation of plain HDPE and binary blends of HDPE and PS. This slip is supplemented by the plastic deformation of an amorphous component. In blends of high SEBS content, the role of deformation of an amorphous component by shear and flow increases markedly due to reduced overall crystallinity of these blends. In such blends an amorphous component includes a semicontinuous embedding of crystallites, and therefore, the deformation process is dominated by deformation mechanisms active in a more compliant amorphous phase. Consequently, with increasing the content of SEBS in the blend, the texture of the oriented blends changes from a single-component (100) [001] texture to a texture with a strong fiber component in addition to a (100)[001] component. In blends with high content of SEBS, the crystalline lamellae of polyethylene do not undergo fragmentation up to the compression ratio of 6, while in blends with low and moderate content of SEBS, such lamellar fragmentation was detected.

Effect of Model Pollutants on the Recycling of PE/PS Plastic Blends

“…It can be noticed that in PE/PS blends, PE has lower melting points Tm than alone. This is in good agreement with the work of Bartczak (18) 2 4 1 -0 4 1 -3 4 1 -9 3 1 -8 4 1 -5 3 1 -E P m T (°) C 4 3 1 7 3 1 4 3 1 0 3 1 1 3 1 9 2 1 observed that the crystallisation temperature of PE in PE/PS blends was increased in comparison with neat PE. As there are no significant differences between the polluted and the virgin blends, it can be concluded that the pollutants have little influence or no influence on the rate and the size of the crystals considered.…”

Morphology development in polyethylene/polystyrene blends: the influence of processing conditions and interfacial modification

“…The addition of a few wt% block copolymer for the emulsification and enhancement of mechanical properties of such immiscible polymer blends is well known 3–8. In order for the block copolymer to be effective in these roles, it must first of all be interfacially active.…”

Investigation of compatibilization effects of SEBS-g-MA on polystyrene/polyethylene blend with a novel separation method in melted state

“…When SEBS-g-MA is located at the interface between PS and HDPE, the styrene blocks of SEBS-g-MA is miscible with PS, while the hydrogenated ethylene-butadiene blocks could form entanglements with the HDPE phases. Previously the thermal behaviour of PS/HDPE blends was investigated, and it was found that the compatibilizer decreased the crystallinity of HDPE [44,62,73] due to the dilution with ethylene-butadiene segments of SEBS. Abis et al [70] mentioned that binary PS/HDPE blends did not show any changes in their DSC parameters, addition of 10% compatibilizer resulted in a decrease of the crystallization and melting temperatures, which indicated the compatibilization effect.…”

“…Some research mentioned styrene-butadiene copolymer (SB) [53] and styrene/butadiene/styrene block copolymer (SBS) [52] as a potential additive for compatibilizing PS and PE with each other, in other papers the effectiveness of polyether copolymer (PEC) [54], hydrogenated butadiene-polystyrene copolymers (SEB) [55] and ethylene/styrene interpolymers [47] were also investigated. However, the most commonly used compatibilizer for improving the miscibility of PS and PE is styrene/ethylene/butylene/styrene block copolymer (SEBS) and its maleic anhydride grafted type (SEBS-g-MA), with which adhesion can be improved between the phases to prepare blends with better toughness [35,44,45,[56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73].…”