Comparison of structure and properties of conventional and ?high-crystallinity? isotactic polypropylenes and their blends with metallocene-catalyzed linear low-density polyethylene. I. Relationships between rheological behavior and thermal and physical properties

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

doi:10.1002/1097-4628(20000815)77:7<1591::aid-app20>3.0.co;2-m

Cited by 24 publications

(19 citation statements)

References 17 publications

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“…The morphology of the phases is of great importance in this manner. A variety of morphologies exist such as dispersed spheres of one polymer in another, lamellar structures, and co-continuous phases (Kukaleva, Cser, Jollands, & Kosior, 2000).…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Characteristics of LDPE : PP and HDPE : PP Polymer Blends

Salih¹,

Hamood²,

Alsabih³

2013

MAS

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Comparative studies have been made on the mechanical properties of High density polyethylene/polypropylene (HDPE : PP) and Low density polyethylene/polypropylene (LDPE : PP) binary blends. Morphological analysis has been also performed using SEM. Blends have been prepared by melt mixing in an extruder. Mechanical tests were performed on the two groups of binary blends. Binary blends (HDPE : PP) gave higher values of tensile strength, fracture strength, young modulus, hardness, creep rate and creep modulus than LDPE : PP. The blend of ratio 20%HDPE : 80%PP shows superior mechanical properties, this blend could bear a load of 846.9 N with an extension of 3.94 mm. SEM results indicated that 20HDPE : 80PP and 20LDPE : 80PP are immiscible blends.

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Section: Introductionmentioning

confidence: 99%

Comparison of the Characteristics of LDPE : PP and HDPE : PP Polymer Blends

Salih¹,

Hamood²,

Alsabih³

2013

MAS

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“…35 Furthermore, they reported that the level of crystallinity of PP in the blends was independent of the PP/LLDPE blend composition, and Young's modulus and the impact strength did not correlate with the level of crystallinity. 35 Liang 36 observed that crystallinity of HDPE increased with increasing melt density during processing. Nevertheless, the effect of the melt-flow index on the crystallization of HDPE/PP blends, in particular, has been little studied.…”

Section: Introductionmentioning

confidence: 99%

Effect of the high‐density polyethylene melt index on the microcellular foaming of high‐density polyethylene/polypropylene blends

Rachtanapun

Selke

Matuana

2004

J of Applied Polymer Sci

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ABSTRACT:The effect of high-density polyethylene (HDPE)/polypropylene (PP) blending on the crystallinity as a function of the HDPE melt index was studied. The melting temperature and total amount of crystallinity in the HDPE/PP blends were lower than those of the pure polymers, regardless of the blend composition and melt index. The effects of the melt index, blending, and foaming conditions (foaming temperature and foaming time) on the void fractions of HDPEs of various melt indices and HDPE/PP blends were also investigated. The void fraction was strongly dependent on the foaming time, foaming temperature, and blend composition as well as the melt index of HDPE. The void fraction of the foamed 30:70 HDPE/PP blend was always higher than that of the foamed 50:50 HDPE/PP blend, regardless of the melt index. The microcellular structure could be greatly improved with a suitable ratio of HDPE to PP and with foaming above the melting temperature for long enough; however, using high-meltindex HDPE in the HDPE/PP blends had a deleterious effect on both the void fraction and cell morphology of the blends.

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“…Thereby, the elastic recovery property is mainly determined by the EOC phase, whereas after dynamic vulcanization phase inversion occurs, resulting in crosslinked EOC as the dispersed phase and PP as the matrix. It is reported that EOC exhibits better elastic characteristics than PP homopolymer 10. By a further increase of the degree of vulcanization in EOC by raising the curative level the elastic recovery property of all TPVs improves.…”

Section: Resultsmentioning

confidence: 99%

“…Δ H C 100% = Extrapolated value of the enthalpy of crystallization of a 100% crystalline sample, for PP the value is 209 (J/g) 2, 10, 12…”

Section: Methodsmentioning

confidence: 99%

“…Very recently, Naskar9 reviewed extensively the thermoplastic elastomers based on PP‐EPDM blends by dynamic vulcanization. Impact modification of PP using ethylene‐α olefins in the place of traditional EPDM has attracted much attention 10–12. Walton13 and Williams and Miller14 reported that these ethylene‐octene copolymers (EOCs) are compatible with most olefinic materials and offer excellent impact modification in semicrystalline materials.…”

Section: Introductionmentioning

confidence: 99%

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Dynamically vulcanized blends of polypropylene and ethylene‐octene copolymer: Comparison of different peroxides on mechanical, thermal, and morphological characteristics

Babu

Singha

Naskar

2009

J of Applied Polymer Sci

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Thermoplastic vulcanizates (TPVs) are prepared by the dynamic vulcanization process, where crosslinking of an elastomer takes place during its melt mixing with a thermoplastic polymer under high shear. TPVs based on polypropylene (PP) with different grades of ethylene-octene copolymers (EOC) were prepared with a coagent assisted peroxide crosslinking system. The effect of dynamic vulcanization and influence of various types and concentrations of peroxide were mainly studied on the basis of the mechanical, thermal, and morphological characteristics. Three structurally different peroxides, namely dicumyl peroxide (DCP), tert-butyl cumyl peroxide (TBCP), and di-tert-butyl peroxy isopropyl benzene (DTBPIB) were investigated. The mechanical properties of the TPVs are primarily determined by the extent of crosslinking in the EOC and the degree of degradation in the PP phase. Among all peroxides used DCP gives best overall properties with low-molecular-weight EOC, whereas TBCP shows best property level with high-molecularweight EOC-based TPVs. These can be explained on the basis of the molecular characteristics of EOC and the nature of the peroxide used. Differential scanning calorimetery (DSC) and morphological analysis reveal that PP and EOC are a thermodynamically immiscible system. The melting endotherm was studied to determine the influence of various peroxides on crystallinity of the PP phase. Tensile fracture patterns were also analyzed to study the failure mechanism of the samples.

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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. I. Relationships between rheological behavior and thermal and physical properties

Cited by 24 publications

References 17 publications

Comparison of the Characteristics of LDPE : PP and HDPE : PP Polymer Blends

Comparison of the Characteristics of LDPE : PP and HDPE : PP Polymer Blends

Effect of the high‐density polyethylene melt index on the microcellular foaming of high‐density polyethylene/polypropylene blends

Dynamically vulcanized blends of polypropylene and ethylene‐octene copolymer: Comparison of different peroxides on mechanical, thermal, and morphological characteristics

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