Thermal and mechanical properties for binary blends of metallocene polyethylene with conventional polyolefins

Rana, Dipak; Lee, C. H.; Cho, K.; Lee, B. H.; Choe, Soonja

doi:10.1002/(sici)1097-4628(19980919)69:12<2441::aid-app15>3.0.co;2-#

Cited by 140 publications

(83 citation statements)

References 3 publications

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“…Two distinct β-transitions have been noted in the iPP-plastomer blends that are thermodynamically immiscible though they are mechanically quite compatible. Blends of iPP containing some ethylene and butene-1 as comonomers with the same plastomer containing octene-1 as comonomer showed an increasing degree of compatibility [284,285].…”

Section: With Higher α-Olefin 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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Section: With Higher α-Olefin Rubbermentioning

confidence: 99%

Rubber–Plastic Blends: Structure–Property Relationship

Datta

2016

Encyclopedia of Polymer Blends

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“…For these reasons, search for 'reinforcing' components imparting better mechanical properties to LLDPE matrices remains a problem to resolve. Because of a high fraction of ethylene units, COC is likely to be compatible with polyethylene and other polyolefins without addition of special compatibilizers [2,17,18,22,46,47]. Very recently, Lamnawar et al [48] has investigated the rheological and morphological behavior of the LLDPE/COC blends, with particular attention to their peel seal characteristics to films of either PE or PET.…”

Section: Introductionmentioning

confidence: 99%

Linear low density polyethylene/cycloolefin copolymer blends

Dorigato¹,

Pegoretti²,

Fambri³

et al. 2011

Express Polym. Lett.

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Abstract. Linear low density polyethylene (LLDPE) was melt compounded with various amounts of a cycloolefin copolymer (COC). Scanning and transmission electron microscopy evidenced, at qualitative level, some interfacial adhesion between LLDPE and COC. Another indication of interactions between the components was the increase of crystallinity degree with rising COC content and the enhancement of COC glass transition temperature with the LLDPE fraction. In order to explain this behaviour, the incorporation of ethylene segments of COC into the LLDPE crystalline phase, leading to an increased number of norbornene units in the remaining COC component undergoing the glass transition, was hypothesized. The thermo-oxidative degradation stability of LLDPE was substantially enhanced by COC introduction for filler contents higher than 20 wt%, especially when an oxidative atmosphere was considered. An increasing fraction of COC in the blends was responsible for an enhancement of the elastic modulus and of a decrease in the strain at break, while tensile strength passed through a minimum, in agreement with the model predictions based on the equivalent box model and equations provided by the percolation theory. The introduction of a rising COC amount in the blends increased the maximum load sustained by the samples in impact tests, but decreased the blend ductility. Concurrently, a significant reduction of the creep compliance of LLDPE was observed for COC fractions higher than 20 wt%.

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“…In the last decade, special attention has been paid to crystalline/crystalline polymer blends, such as highdensity polyethylene/linear low-density polyethylene or other different types of polyethylenes, [1][2][3] linear lowdensity polyethylene/modified poly(propylene) blends, [4] poly(propylene) with different tacticities, [5][6][7][8] and vinylidene fluoride/hexafluoaroacetone copolymer/vinylidene fluoride tetrafluoroethylene copolymer blends, [9] as they may provide a versatile and low-cost solution for better control of the properties and quality of the end products.…”

Section: Introductionmentioning

confidence: 99%

Thermal Behavior of Isotactic Poly(propylene)/Maleated Poly(propylene) Blends

Vîlcu

Grigoraş²,

Vasile³

2007

Macro Materials & Eng

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This paper analyzes the thermal and thermo‐oxidative degradation behavior, phase separation, melting, and crystallization of blends consisting of isotactic poly(propylene) (IPP) and poly(propylene) grafted with maleic anhydride (PP‐g‐MA). It has been established that, depending on the blend composition and crystallization/preparation procedure, the blends of IPP and PP‐g‐MA can either co‐crystallize or evidence phase separation. This conclusion has been attained by comparing the DSC results of crystallization under dynamic and isothermal conditions with X‐ray diffraction results. On the basis of the obtained results, the optimum mixing ratios have been established as 95–85 wt.‐% IPP/5–15 wt.‐% PP‐g‐MA. Thermo‐oxidative behavior has been studied by thermogravimetry and differential thermal analysis.magnified image

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Thermal and mechanical properties for binary blends of metallocene polyethylene with conventional polyolefins

Cited by 140 publications

References 3 publications

Rubber–Plastic Blends: Structure–Property Relationship

Rubber–Plastic Blends: Structure–Property Relationship

Linear low density polyethylene/cycloolefin copolymer blends

Thermal Behavior of Isotactic Poly(propylene)/Maleated Poly(propylene) Blends

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