Graft copolymer modification of polyethylene–polystyrene blends. II. Properties of modified blends

Abstract

synopsisThe use of graft copolymers of styrene onto polyethylene as additives to improve the mechanical properties of polyethylene-polystyrene blends is described. Blends containing equal proportions of low-density polyethylene and polystyrene were selected for this study since this composition represents the poorest balance of properties in this system. Graft addition generally increased both the yield strength and the elongation a t break of the blend. Of the grafts employed, those prepared at an irradiation dose near 0.5 megarad appear optimal for this purpose. These conditions apparently balance the beneficial effects of grafting extent and the detrimental effects of crosslinking, both of which increase with irradiation dose.

Dynamic mechanical and thermal properties of physically compatibilized natural rubber/poly(methyl methacrylate) blends by the addition of natural rubber-graft- poly(methyl methacrylate)

“…Numerous studies have been reported on the morphology and properties of compatibilized binary blends. [25][26][27] Addition of copolymer is reported to improve the interfacial adhesion and the mechanical properties.…”

Structure and properties of blends of poly(ethylene-co-vinyl alcohol) with poly(styrene-co-maleic anhydride)

“…4 A mixture of LDPE/PS 50 : 50 w/w, preof branching and crosslinking as verified from pared by the same Rheomix unit, had a tensile extraction experiments ) , the higher the tensile strength of 6.03 MPa and an elongation at break strength is. The increase is also partly attributof 21.3%.…”

Polystyrene/High Density Polyethylene Blends Compatibilized by a Tri-Block Copolymer I. Properties and Morphology

“…6 -8 However, PS/PE blends exhibit very poor mechanical properties owing to their incompatibility. 9 -11 Therefore, compatibilization of PS and PE blends has been the subject of much study in recent decades_ 1,7,[12][13][14][15][16] It is well known that the addition of a block or graft copolymer acting as a compatibilizer to phase-separated blends of immiscible homopolymers can result in a remarkable improvement in their mechanical properties. 13· 17 Barentsen et a/.…”