Mechanical properties of blends containing HDPE and PP

Bartlett, Dana; Barlow, J. W.; Paul, Donald R

doi:10.1002/app.1982.070270704

Cited by 97 publications

(40 citation statements)

References 15 publications

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“…Bartlett et al [6] have claimed that the appropriate amount of ethylene-propylene rubber could greatly improve the ductility of PP/HDPE but with a corresponding decrease in strength and modulus.…”

Section: Resultsmentioning

confidence: 99%

Study on the mechanical and morphological properties of toughened polypropylene blends for automobile bumpers

Liu

Gui-xue

2012

Polym. Bull.

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Studies on the use of polyolefin elastomer (POE) and high density polyethylene (HDPE) for toughening polypropylene (PP) to meet the demands of automobile bumpers were conducted. The effect of the basic resin, POE and the influences of the POE amount and HDPE doses on the mechanical properties of the blended composites were discussed. The morphology of impact fracture sections were characterized by scanning electron microscopy (SEM) while the crystalline properties were investigated by DSC. The effect of the composites' morphology on mechanical properties was also discussed. Results showed that POE could improve the impact strength of PP while the use of HDPE had obvious effects on synergistic toughening. SEM images and DSC data analysis testified to the relationship between morphology, crystallinity and the mechanical properties.

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Section: Resultsmentioning

confidence: 99%

Study on the mechanical and morphological properties of toughened polypropylene blends for automobile bumpers

Liu

Gui-xue

2012

Polym. Bull.

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“…It was noted that samples prepared by compression molding were less ductile and less strong than those prepared by injection molding. 9,22 An increase in the mixing time and intensity improved the degree of dispersion; however, prolonged or intensive mixing also increased the thermal and mechanical degradation. There is an optimum mixing procedure that should be sought.…”

Section: Introductionmentioning

confidence: 97%

Mechanical properties and morphology of polyethylene-polypropylene blends with controlled thermal history

Shanks

2000

J. Appl. Polym. Sci.

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ABSTRACT:The effect of time-temperature treatment on the mechanical properties and morphology of polyethylene-polypropylene (PE-PP) blends was studied to establish a relationship among the thermal treatment, morphology, and mechanical properties. The experimental techniques used were polarized optical microscopy with hotstage, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and tensile testing. A PP homopolymer was used to blend with various PEs, including high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and very low density polyethylene (VLDPE). All the blends were made at a ratio of PE:PP ϭ 80:20. Thermal treatment was carried out at temperatures between the crystallization temperatures of PP and PEs to allow PP to crystallize first from the blends. A very diffuse PP spherulite morphology in the PE matrix was formed in partially miscible blends of LLDPE-PP even though PP was present at only 20% by mass. Droplet-matrix structures were developed in other blends with PP as dispersed domains in a continuous PE matrix. The SEM images displayed a fibrillar structure of PP spherulite in the LLDPE-PP blends and large droplets of PP in the HDPE-PP blend. The DSC results showed that the crystallinity of PP was increased in thermally treated samples. This special time-temperature treatment improved tensile properties for all PE-PP blends by improving the adhesion between PP and PE and increasing the overall crystallinity. In particular, in the LLDPE-PP blends, tensile properties were improved enormously because of a greater increase in the interfacial adhesion induced by the diffuse spherulite and fibrillar structure.

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“…This intermediacy in properties manifests in two ways. An alternative use of EPR rub bers is as a compatibilizer in blends of PE and iPP [259,260]. The difference in solubility parameters is large enough that iPP-EPR blends are generally immiscible [96,261,262].…”

Section: With Ethylene-propylene Copolymer Rubbermentioning

confidence: 99%

Rubber–Plastic Blends: Structure–Property Relationship

Datta

2016

Encyclopedia of Polymer Blends

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Blends of rubbers and plastics have both an extensive history and a variety of applications, since blends retain most of the stiffness of thermoplastics and impart some of the resilience and the impact toughness of rubbers. Most useful blends have morphology of rubber dispersed in the thermoplastic matrix since the reverse does not lead to same degree of utility. The properties of these blends depend on the relative ratio of the rubber and the plastic and, more importantly, on the morphology of the dispersion. A very large research effort has been made in an attempt to control and determine the morphology and the interface of the rubber and the plastic as well as understand the effect of the rubber dispersion on the properties of the blend. Blends are important commercially since they allow the development of unique properties from the same constituents with small changes in the relative amounts or the dispersion. The conventional prac tice of blend formation is the melt mixing of the components although, in some cases, a polymerization process that enables the direct production of the binary blend is possible. These direct production processes are efficient since they pro duce the desired morphology and the required polymers in a single step. Blends have become extremely important for the development of polyolefin rubbers and plastics since a large variety can be mixed in a wide composition ratio to produce novel properties. These blends are easily made and have stable dispersion during processing due to only small thermodynamic differences between the various polyolefins compared with engineering thermoplastics. This chapter describes the physics and the chemistry and more importantly the relationship between the structure of the blend and its properties. This area has been continually progressed [1] and reviewed [2]. Progress arises from new materials and new technologies for making rubber-plastic blends. The area of polyethylene blends cited above is an important development. The Encyclopedia of Polymer Blends: Volume 3: Structure, First Edition. Edited by Avraam I. Isayev.

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Mechanical properties of blends containing HDPE and PP

Cited by 97 publications

References 15 publications

Study on the mechanical and morphological properties of toughened polypropylene blends for automobile bumpers

Study on the mechanical and morphological properties of toughened polypropylene blends for automobile bumpers

Mechanical properties and morphology of polyethylene-polypropylene blends with controlled thermal history

Rubber–Plastic Blends: Structure–Property Relationship

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