Polyethylene-polystyrene blends

Trochimczuk, Witold; Matys, Jacek

doi:10.1016/0014-3057(90)90204-h

Cited by 18 publications

(19 citation statements)

References 9 publications

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“…Shrinkage during PE crystallization is about 10%. 18 Thus, the difference in MOE may be the result of voids that arise from different thermal expansion coefficients for the different phases in the blended samples. This morphological difference probably arises, in turn, from processing methods.…”

Section: Densitymentioning

confidence: 99%

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Mechanical properties and creep resistance in polystyrene/polyethylene blends

Simonsen

Rochefort

2000

J. Appl. Polym. Sci.

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ABSTRACT:Recycled plastics, predominantly high-density polyethylene (PE), are being processed in the shape of dimension lumber and marketed as "plastic lumber." One drawback to these products is their low creep resistance or high creep speed. The objective of this study was to examine the feasibility of reducing the creep speed of PE-based products by blending the PE with a lower-creep plastic, in this case polystyrene (PS). Various blends of PE and PS were prepared in either a laboratory extruder or a bowl mixer and then compression-molded. The mechanical properties, creep behavior, morphology, and thermal properties of extruded and compressionmolded samples were determined. The modulus of elasticity of the extruded blends could be estimated by a weighted average of PS and PE, even in the absence of a compatibilizer. Processing strongly affected the morphology and mechanical properties of the blends. For 50% PS : 50% PE blends, the stress-strain curves of the extruded samples showed PE-like behavior, whereas those from compressionmolded samples were brittle, PS-like curves. Flexural strength was 50% higher in the extruded samples than in those from compression molding. The creep experiments were performed in three-point bending. Creep speed was lower in 50% PS : 50% PE and 75% PS : 25% PE blends than in pure PS. Creep speed of 75% PS : 25% PE was lowest of all the extruded blends. PE formed the continuous phase even when the PS content was as high as 50 wt %. For a 75% PS : 25% PE blend, cocontinuous phases were observed in the machine direction. A ribbonlike PSdispersed phase was observed in the 25% PS : 75% PE and 50% PS : 50% PE samples. Blending low-creep-speed PS with high-creep-speed PE appeared to successfully improve the performance of the final composite.

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Section: Densitymentioning

confidence: 99%

“…12 The size and shape of the minor phase are critical to the impact properties. 17,18 A literature search found no reports on creep resistance in this blend system.…”

Section: Introductionmentioning

confidence: 97%

Mechanical properties and creep resistance in polystyrene/polyethylene blends

Simonsen

Rochefort

2000

J. Appl. Polym. Sci.

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“…In particular, ABS has been seen to form a skin around a more HIPS rich core in injection molding [23]. Although HIPS and ABS have been found to be compatible under some conditions, blends of polyolefins and polystyrenes are normally considered immiscible with a low interfacial adhesion [24,25]. The incompatibility of these blends is also reflected in the mechanical properties, such as impact, tensile and flexural strength.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Thermal Characterization of Melt-Filtered, Blended and Reprocessed Post-Consumer WEEE Thermoplastics

Stenvall

Boldizar

2016

Recycling

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Abstract:A melt-blended and melt-filtered real post-consumer and recyclable waste electrical and electronic equipment plastics blend (WEEEBR) was studied, where the WEEEBR contained mainly acrylonitrile-butadiene-styrene copolymer (~40 wt %), high impact polystyrene (~40 wt %) and polypropylene (~10 wt %). The main aim was to better understand the influence of different reprocessing conditions on the mechanical and thermal properties of WEEEBR and to compare these properties with the corresponding properties of model material blends of samples from single screw extrusion, twin screw extrusion and injection molding. For all the reprocessing alternatives studied, WEEEBR was found to be processable and an acceptable surface character could be obtained within narrow processing condition windows. It was found in particular that the reprocessing conditions influenced the elongation at break of WEEEBR, and to a lesser extent also the width of the polypropylene melting temperature region. The highest yield stress and elongation at break of WEEEBR was obtained after twin-screw extrusion at low barrel temperatures (180-200˝C) and a low screw rotation rate (60 rpm). Injection molding produced brittle materials with low impact strength, possibly due to molecular orientation effects.

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“…A number of authors have reported studies on effects of an amorphous inclusion phase on the crystallization and mechanical behavior of blends of semicrystalline polymers. In particular, many authors have investigated the effect of atactic polystyrene (PS) on semicrystalline polyethylene within immiscible blends 1, 10–12. Their research concluded that the crystallinity of the semicrystalline matrix was typically decreased by the amorphous PS inclusions, resulting in polyethylene (PE) crystallite growth inhibition.…”

Section: Introductionmentioning

confidence: 99%

Crystallization kinetics of low‐density polyethylene and polypropylene melt‐blended with a low‐T_g tin‐based phosphate glass

Guschl

Otaigbe

2003

J of Applied Polymer Sci

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ABSTRACT:The nonisothermal and isothermal crystallizations of low-density polyethylene (LDPE) and polypropylene (PP) in phosphate glass (Pglass)-polymer hybrid blends were studied through differential scanning calorimetry (DSC). As the Pglass volume fraction was increased, the percentage crystallinity decreased. The half-time for crystallization decreased as the propagation rate constant rose, for both of the polymer matrices, with increasing Pglass concentrations. The Pglass was observed to be a nucleating agent for formation of two-or three-dimensional spherulites in the hybrids. Tensile modulus improved for both of the Pglass-polymer hybrids up to 40% Pglass, but the energy to break decreased. Tensile strength changed slightly with the addition of Pglass to the LDPE matrix, exhibiting a larger value than that of pure LDPE at 30%. The tensile strength decreased as more Pglass was added to the PP matrix. The observed differences between tensile properties of the Pglass-PP and Pglass-LDPE hybrids at identical Pglass volume concentration were found to be consistent with that of the crystallization behavior of the hybrids.

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Polyethylene-polystyrene blends

Cited by 18 publications

References 9 publications

Mechanical properties and creep resistance in polystyrene/polyethylene blends

Mechanical properties and creep resistance in polystyrene/polyethylene blends

Mechanical and Thermal Characterization of Melt-Filtered, Blended and Reprocessed Post-Consumer WEEE Thermoplastics

Crystallization kinetics of low‐density polyethylene and polypropylene melt‐blended with a low‐T_g tin‐based phosphate glass

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Polyethylene-polystyrene blends

Cited by 18 publications

References 9 publications

Mechanical properties and creep resistance in polystyrene/polyethylene blends

Mechanical properties and creep resistance in polystyrene/polyethylene blends

Mechanical and Thermal Characterization of Melt-Filtered, Blended and Reprocessed Post-Consumer WEEE Thermoplastics

Crystallization kinetics of low‐density polyethylene and polypropylene melt‐blended with a low‐Tg tin‐based phosphate glass

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Product

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Crystallization kinetics of low‐density polyethylene and polypropylene melt‐blended with a low‐T_g tin‐based phosphate glass