Comparison of structure and properties of conventional and ?high crystallinity? isotactic polypropylenes and their blends with metallocene-catalyzed linear low density polyethylene. II. Morphological studies

Kukaleva, Natalia; Cser, F.; Jollands, Margaret; Kosior, E.

doi:10.1002/1097-4628(20010509)80:6<831::aid-app1161>3.0.co;2-a

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…The change of cutting temperature was required because all samples were too soft and viscous to be cut at room temperature without deformation. The low temperature cutting preserved the sample morphology (17). An Olympus BH-2 polarizing microscope at crossed and parallel polars (light and polarized light) was used to obtain optical micrographs.…”

Section: Optical Microscopy (Om)mentioning

confidence: 99%

Relationship between cell morphology and impact strength of microcellular foamed high‐density polyethylene/polypropylene blends

Rachtanapun

Selke

Matuana

2004

Polymer Engineering & Sci

125

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Polymer blends, such as those resulting from recycling postconsumer plastics, often have poor mechanical properties. Microcellular foams have been shown to have the potential to improve properties, and permit higher-value uses of mixed polymer streams. In this study, the effects of microcellular batch processing conditions (foaming time and temperature) and HDPE/PP blend compositions on the cell morphology (the average cell size and cell-population density) and impact strength were studied. Optical microscopy was used to investigate the miscibility and crystalline morphology of the HDPE/PP blends. Pure HDPE and PP did not foam well at any processing conditions. Blending facilitated the formation of microcellular structures in polyolefins because of the poorly bonded interfaces of immiscible HDPE/PP blends, which favored cell nucleation. The experimental results indicated that well-developed microcellular structures are produced in HDPE/PP blends at ratios of 50:50 and 30:70. The cell morphology had a strong relationship with the impact strength of foamed samples. Improvement in impact strength was associated with welldeveloped microcellular morphology. Polym. Eng. Sci. 44:1551-1560, 2004

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Section: Optical Microscopy (Om)mentioning

confidence: 99%

Relationship between cell morphology and impact strength of microcellular foamed high‐density polyethylene/polypropylene blends

Rachtanapun

Selke

Matuana

2004

Polymer Engineering & Sci

125

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“…The blending of polyethylene with polypropylene has received considerable attention as they are two of the most commonly used thermoplastics. The reason is not only a favorable price/performance ratio, but also the versatility of these materials and very broad range of their possible modification [1–4].…”

Section: Introductionmentioning

confidence: 99%

Extrusion of polyethylene/polypropylene blends with microfibrillar‐phase morphology

et al. 2010

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Extrusion of immiscible polymers under special conditions can lead to creation of microfibrillar‐phase morphology, ensuring significant increase of mechanical properties of polymer profiles. Polyethylene/polypropylene blend extrudates with microfibrillar‐phase morphology (polypropylene microfibrils reinforcing polyethylene matrix phase) were prepared through continuous extrusion with semihyperbolic‐converging die enabling elongation and orientation of microfibrils in flow direction. Structure of extruded profiles was examined using electron microscopy and wide‐angle X‐ray scattering. Tensile tests proved that extrudates with microfibrillar‐phase morphology show significantly higher mechanical properties than the conventional extrudates. The presented concept offers possibility of replacing the existing expensive multi‐component medical devices with fully polymeric tools. POLYM. COMPOS., 31:1427–1433, 2010. © 2009 Society of Plastics Engineers

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“…However there have been many studies on PP/EOC blends,13–26 most of the reported works to date employed EOCs have octene content of about 8 mol %. In the present study, we investigate the effect of octene comonomer content in EOC on the morphology and thermal and mechanical properties in PP/EOC blends.…”

Section: Introductionmentioning

confidence: 99%

Effect of octene content in poly(ethylene‐co‐1‐octene) on the properties of poly(propylene)/poly(ethylene‐co‐1‐octene) blends

Lee

Kim

Son

2006

J of Applied Polymer Sci

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Ethylene-octene random copolymer (EOC) is one of the most commonly employed elastomers for PP, and as such its rubber toughening efficiency has been extensively studied. However, most existing studies employ EOC containing an octene comonomer of about 8 mol %. Therefore, in this study, we investigated the effect of EOC octene comonomer content on the morphology and thermal and mechanical properties of PP-ethylene random copolymer (PP-CP)/EOC (80/20 wt %/wt %) blends. It was clearly shown that the properties of the blends are significantly affected by the octene content. The rubber particle size of the blends decreased as the octene content in the EOC was increased, which was a consequence of the reduced interfacial tension between PP-CP and EOC. Impact strength of the blends as a function of octene content displayed a brittle-ductile transition. The tensile yield strength and modulus of the PP-CP/ EOC blends were decreased by addition of EOC, owing to incorporation of the soft EOC into the hard PP-CP. The tensile yield strength and modulus of PP-CP/EOC blends decreased monotonically with the octene content in the EOC. The melting temperature as well as the crystallinity of the PP-CP phase were not affected significantly by the addition of EOC whereas a notable shift in melting and crystallization temperatures was observed for the EOC phase.

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Comparison of structure and properties of conventional and ?high crystallinity? isotactic polypropylenes and their blends with metallocene-catalyzed linear low density polyethylene. II. Morphological studies

Cited by 7 publications

References 9 publications

Relationship between cell morphology and impact strength of microcellular foamed high‐density polyethylene/polypropylene blends

Relationship between cell morphology and impact strength of microcellular foamed high‐density polyethylene/polypropylene blends

Extrusion of polyethylene/polypropylene blends with microfibrillar‐phase morphology

Effect of octene content in poly(ethylene‐co‐1‐octene) on the properties of poly(propylene)/poly(ethylene‐co‐1‐octene) blends

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