The effect of addition of high‐density polyethylene on the crystallization and mechanical properties of polypropylene and glass‐fiber‐reinforced polypropylene

Gupta, A. K.; Gupta, V. B.; Peters, R. H.; Harland, W. G.; Berry, J. P.

doi:10.1002/app.1982.070271214

Cited by 106 publications

(53 citation statements)

References 14 publications

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“…[2][3][4]6,19 Linear additive properties of pure PP and PE in the modulus and yield stress were observed in HDPE--PP blends by some authors, 6 while others reported a large positive deviation [2][3][4] or negative deviation 19 from linearity. The synergism in the modulus and yield stress has been attributed to a reduction in the average spherulite size of PP and an increase in overall crystallinity introduced by the addition of PE and an increase in tie molecules or intercrystalline links observed by scanning electron microscopy (SEM).…”

Section: Introductionmentioning

confidence: 89%

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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Section: Introductionmentioning

confidence: 89%

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

Shanks

2000

J. Appl. Polym. Sci.

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“…A/m: The area under the exotherm per unit weight of the crystallizable component of the sample which is proportional to the degree of crystallinity. 13 The data on T p , Si, (T c Ϫ T p ), ⌬w, and A/m are given in Table I and their variation as a function of the blend composition is shown in Figures 4 and 5. In the unvulcanized blend system, an initial addition of 10 wt % SBS to PP results in a decrease in the degree of crystallinity of PP.…”

Section: Dynamically Vulcanized Sbs Blendsmentioning

confidence: 99%

Studies on dynamically vulcanized polypropylene (PP)/butadiene styrene block copolymer (SBS) blends: Crystallization and thermal behavior

Saroop

Mathur

1999

J. Appl. Polym. Sci.

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ABSTRACT:Crystallization of polypropylene (PP) in unvulcanized blends of PP with the butadiene-styrene block copolymer (SBS) was studied through differential scanning calorimetry (DSC) and X-ray diffraction measurements in the composition range of 0 -40 wt % SBS content. Analysis of the crystallization exotherms revealed variation in the crystallization behavior, crystallinity, and crystalline morphology of the PP component in the blends at various levels of SBS concentration. The crystallinity determined by X-ray diffraction and DSC showed identical variations with the blend composition. The tensile and thermal properties of the blends were studied in the entire composition range. Correlations of the tensile properties with the crystallization parameters of the PP component in the blends are also presented.

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“…Other authors have observed that glass fibres actually increase the crystallinity of some polymer matrices. They attributed this increase in the crystallinity to the formation of some polymer crystallites along the surface of the fiber [2] [3]. The slight increase of the melting temperature due to the presence of a large crystal results in a higher temperature necessary to melt the crystal.…”

Section: Non Isothermal Crystallization Behaviormentioning

confidence: 99%

Crystallization Kinetics of Melt-Blended Low-Density Phthalic Anhydride with a Low-Tg Tin-Phosphate

Al-Harbi¹

2014

OJPChem

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Polyamide prepared by the reaction of ethylene diamine with different ratios between 1,6-glyconic acid and phthalic anhydride. The differential scanning calorimetry (DSC) is used to study the nonisothermal and isothermal crystallization of low density polyamides in phosphate glass (Pglass)-polymer hybrid blends. The % crystallinity decreased as the Pglass volume increased. The half-life (t 1/2 ) for crystallization decreased as the propagation rate constant rose for both the polymer matrices with increasing Pglass concentrations. The results show that the Pglass is improved nucleating agent for formation of the Pglass-polymer hybrids up to 35% Pglass and the energy necessary to break decreased. The stability of the reaction of ethylene diamine with phthalic anhydride and glyconic acid was qualitatively investigated using molecular orbital calculations.

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The effect of addition of high‐density polyethylene on the crystallization and mechanical properties of polypropylene and glass‐fiber‐reinforced polypropylene

Cited by 106 publications

References 14 publications

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

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

Studies on dynamically vulcanized polypropylene (PP)/butadiene styrene block copolymer (SBS) blends: Crystallization and thermal behavior

Crystallization Kinetics of Melt-Blended Low-Density Phthalic Anhydride with a Low-Tg Tin-Phosphate

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