Blends of homogeneous ethylene-octene copolymers

Bensason, S.; Nazarenko, S.; Chum, S. P.; Hiltner, A.; Baer, E.

doi:10.1016/s0032-3861(96)00906-8

Cited by 56 publications

(54 citation statements)

References 21 publications

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“…33,34 Mechanical characterization of polyolefin blends has also been a subject of interest. 2,[5][6][7][20][21][22][23][30][31][32] Molecular parameters like branch content (BC), branch type, composition distribution, molecular weight (M w ) and molecular weight distribution (MWD) were found to be the key factors affecting the miscibility of polyolefin blends. Hill 9 using transmission electron spectroscopy (TEM) found that M w of linear HDPE had little influence on its miscibility with branched PEs.…”

Section: Introductionmentioning

confidence: 99%

“…A large number of studies utilizing different techniques were devoted to investigate the phase morphology and characterization of polyolefin blends. These techniques include transmission electron spectroscopy, [8][9][10][11] small angle neutron scattering, [11][12][13] differential scanning calorimetry, 2,5,11,[14][15][16][17][18][19][20][21][22][23] rheology, 3,4,6,7,[16][17][18][24][25][26][27][28][29][30] X-ray diffraction 11,14,31 and more recently thermal fractionation techniques. 33,34 Mechanical characterization of polyolefin blends has also been a subject of interest.…”

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confidence: 99%

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Melt Miscibility and Mechanical Properties of Metallocene LLDPE blends with HDPE: Influence of Mw of LLDPE

Hameed¹,

Hussein

2006

Polym J

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ABSTRACT:The influence of M w of LLDPE on the rheological, thermal and mechanical properties of m-LLDPE/ HDPE blends of low and high branch content (BC) was studied. Melt rheology of m-LLDPE blended with linear HDPE revealed strong influence of M w on melt miscibility at both branching levels. Low M w m-LLDPE/HDPE blends are suggested to be miscible at all compositions, while viscosity of high M w m-LLDPE/HDPE blends showed negative deviation from log additivity suggesting layered morphology of these blends. The DSC results suggest that compatibility in the solid state is independent of M w and BC. For all blends studied, the HDPE-rich blends were found to contain single crystal populations suggesting high degree of cocrystallization, whereas, m-LLDPE rich phase showed separate crystallization. The melt miscibility and the crystallization of high BC m-LLDPE blends with HDPE are suggested to be controlled by different factors. Small strain mechanical properties of these blends were found to be a strong function of blend compatibility and the specific properties of the blend components.[doi:10.1295/polymj.PJ2005254] KEY WORDS LLDPE/HDPE Blends / Miscibility / Rheology / Mechanical Properties / DSC / Molecular Weight / Polyethylene blends are widely used to improve processing and tailor properties.1-7 However, this enhancement of processing and properties is dictated by phase homogeneity or heterogeneity of these blends in the melt and solid state. A large number of studies utilizing different techniques were devoted to investigate the phase morphology and characterization of polyolefin blends. These techniques include transmission electron spectroscopy, [8][9][10][11] small angle neutron scattering, 11-13 differential scanning calorimetry, 2,5,11,[14][15][16][17][18][19][20][21][22][23] rheology, 3,4,6,7,[16][17][18][24][25][26][27][28][29][30] X-ray diffraction 11,14,31 and more recently thermal fractionation techniques. 33,34 Mechanical characterization of polyolefin blends has also been a subject of interest. 2,[5][6][7][20][21][22][23][30][31][32] Molecular parameters like branch content (BC), branch type, composition distribution, molecular weight (M w ) and molecular weight distribution (MWD) were found to be the key factors affecting the miscibility of polyolefin blends. Hill 9 using transmission electron spectroscopy (TEM) found that M w of linear HDPE had little influence on its miscibility with branched PEs. Alamo et al.12 observed that BC of the branched polyethylene (PE) is the most important parameter controlling the phase behavior of branched and linear PE blends. They reported no effect of M w of branched PE on its miscibility with linear polyethylene for M w $ 100 kg/mol. On the other hand, Tanem and Stori 10 reported strong influence of M w on miscibility of linear and branched PEs. They observed that low M w of m-LLDPE enhanced its miscibility with linear HDPE. Recently, the authors have extensively studied the influence of molecular parameters on the miscibility of different polyethylenes [21][2...

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Melt Miscibility and Mechanical Properties of Metallocene LLDPE blends with HDPE: Influence of Mw of LLDPE

Hameed¹,

Hussein

2006

Polym J

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“…As the samples were stored at room temperature prior to the measurement for several days (and the glass transition temperature is well below room temperature) [17,22,44,45], the samples had sufficient time to compensate for the differences in the amorphous phase caused the cooling conditions, thus the differences between the quenched and slowly cooled samples can be regarded negligible. …”

Section: Influence Of the Molar Mass On The D-spacing Of The Amorphoumentioning

confidence: 99%

Lattice sizes, crystallinities, and spacing between amorphous chains - characterization of ethene-/ɑ-olefin copolymers with various comonomers and comonomer contents measured by wide angle X-ray scattering

Stadler¹,

Takahashi

Yonetake

2009

E-Polymers

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Ethene-/-olefin copolymers having a wide range of comonomer contents with comonomers between 4 and 26 carbon atoms in length were characterized by wide angle X-ray scattering (WAXS). It was found that the crystallinities matched fairly well with the crystallinities from DSC and volumetric measurements. An increase of the crystal lattice size was found with increasing comonomer content and comonomer length. Both are attributed to the formation of defects around these short-chain branches in the crystal lattice, which widen it. Increasing the cooling time will lead to a more densely packed crystal structure, if the quenched structure is distorted, i.e. if the sample contains comonomer. A higher molar mass M w widens the average space between chains in the amorphous phase as well as the addition of comonomer. The latter finding is explained by the increasing number of chain ends introduced by the comonomer which increases the free volume in the sample because of the worse amorphous packing of the chain ends.

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“…Hence, there is still a need of strategy for the technical production of materials having desired properties profile on the basis of commodity plastics. In this regard, the copolymerisation of polyethylene with a -olefins has been shown to drastically alter the mechanical properties of the polyethylene at hand 2,3 . The use of single-site metallocene catalysts leads to the formation of homogeneous ethylene/-olefin copolymers with uniform distribution of commoners and a narrow molar mass distribution 2 .…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, the copolymerisation of polyethylene with a -olefins has been shown to drastically alter the mechanical properties of the polyethylene at hand 2,3 . The use of single-site metallocene catalysts leads to the formation of homogeneous ethylene/-olefin copolymers with uniform distribution of commoners and a narrow molar mass distribution 2 . In general, it is known that via copolymerisation with higher -olefin comonomers, the density and hence the melt flow index (MFI) of these copolymers may be adjusted in a controlled manner.…”

Section: Introductionmentioning

confidence: 99%

Morphology of Ethylene/1-Octene Copolymers and Their Blends with High Density Polythylene: A Microscopic Evaluation

Adhikari

2013

J. Nepal Chem. Soc.

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Blends of homogeneous ethylene-octene copolymers

Cited by 56 publications

References 21 publications

Melt Miscibility and Mechanical Properties of Metallocene LLDPE blends with HDPE: Influence of Mw of LLDPE

Melt Miscibility and Mechanical Properties of Metallocene LLDPE blends with HDPE: Influence of Mw of LLDPE

Lattice sizes, crystallinities, and spacing between amorphous chains - characterization of ethene-/ɑ-olefin copolymers with various comonomers and comonomer contents measured by wide angle X-ray scattering

Morphology of Ethylene/1-Octene Copolymers and Their Blends with High Density Polythylene: A Microscopic Evaluation

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