Processing and Properties of Polyolefin Elastomers and Fully Hydrogenated Styrenic Block Copolymer Elastomers

Patel, Rajesh N.; Hahn, Stephen F.; Esneault, C.; Bensason, S.

doi:10.1002/1521-4095(200012)12:23<1813::aid-adma1813>3.0.co;2-8

Cited by 25 publications

(25 citation statements)

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“…Recently, polyolefin elastomers (POEs) have been introduced as a new soft material that could be used as an efficient impact modifier [5][6][7]. This material is a copolymer of ethylene and another α-olefin such as butene or octene which is produced using metallocene catalysts with narrow molecular weight and comonomer distribution [8,9]. Although the structure of these materials is similar to the polyolefins, they have elastomeric properties at low density (low degree of crystallinity) and do not show well-defined yielding behavior [8].…”

Section: Introductionmentioning

confidence: 99%

“…This material is a copolymer of ethylene and another α-olefin such as butene or octene which is produced using metallocene catalysts with narrow molecular weight and comonomer distribution [8,9]. Although the structure of these materials is similar to the polyolefins, they have elastomeric properties at low density (low degree of crystallinity) and do not show well-defined yielding behavior [8]. Polyolefin elastomers have some advantages over the other common elastomers, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Organoclay localization in polyamide 6/ethylene-butene copolymer grafted maleic anhydride blends: the effect of different types of organoclay

et al. 2011

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Localization of organoclays between two phases of polyamide 6 (PA6)/maleic anhydride grafted ethylenebutene copolymer (EB-g-MAH) blends, prepared via melt mixing, was investigated as a function of organoclay type. Cloisite 30B, Cloisite 20A and Cloisite 15A were used as different types of organoclay. The influence of different blend compositions and clay contents were also studied. Contact angle measurements have been applied to determine surface tension of components and then to calculate the wetting coefficient which is a useful parameter for prediction of the organoclay location. In general, all organoclays were found to locate in the more hydrophilic polyamide 6 phase. However, for Cloisite 20A and Cloisite 15A transmission electron microscopy (TEM) observations revealed some organoclay layers in the EB-g-MAH phase. Phase structure and nanocomposite morphology were evaluated using scanning and transmission electron microscopy and small angle X-ray scattering (SAXS). Results indicated the formation of an exfoliated or an intercalated morphology in different samples. Dynamic-mechanical thermal analysis and thermal gravimetric analysis were used as an experimental probe to confirm the location of nanoclays predicted via wetting coefficient. The shifting of glass transition temperature for PA6 phase confirmed that nanoclays are more distributed in this phase.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Organoclay localization in polyamide 6/ethylene-butene copolymer grafted maleic anhydride blends: the effect of different types of organoclay

et al. 2011

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“…These materials possess greatly enhanced toughness compared to C homopolymer. 12 Synthetic manipulation of the vinyl content of the diene block of the unsaturated block copolymer precursor provides a means for varying the degree of crystallinity in the E block, 14 enabling access to an array of materials that span the continuum from plastics to elastomers. Therefore, C/E glassy-semicrystalline block copolymers offer new opportunities in applications that require chemically resistant, oxidatively stable, optically clear materials.…”

Section: Introductionmentioning

confidence: 99%

Control of Mechanical Behavior in Polyolefin Composites: Integration of Glassy, Rubbery, and Semicrystalline Components

2007

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The mechanical properties of a homologous series of polyolefin block copolymers comprised of glassy poly(cyclohexylethylene) (C), elastomeric poly(ethylene-alt-propylene) (P), and semicrystalline poly-(ethylene) (E) are documented. Monodisperse CPEPC, CPE, and CEPEC with mass fractions w C ∼ 0.39-0.44 and 0 e e 1, where ) w E /(w E + w P ), were synthesized by sequential anionic polymerization of styrene, isoprene, and butadiene followed by catalytic hydrogenation. These materials hierarchically microphase separate into lamellae, within which templated crystallization-induced segregation occurs. As increases, the unoriented, polydomain CPEPC materials exhibit monotonically increasing elastic moduli and yield stresses, comparable ultimate tensile strengths, and decreasing failure strains. Cold drawing the CPEPC polymers yields high-strength materials, the structures of which are examined by small-and wide-angle X-ray scattering. Drawn CPEPC-70 ( ) 0.70) exhibits improved toughness with an ultimate tensile strength σ fail ) 75 ( 10 MPa and elongation at break of fail ) 1.22 ( 0.22, as compared to σ fail ) 92 ( 21 MPa and fail ) 0.86 ( 0.18 for drawn CEC ( ) 1.00). Elasticity measurements on the drawn samples demonstrate that materials with > 0 exhibit low degrees of stress softening, while smaller permanent sets and higher failure strains are observed as decreases.

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“…From a practical viewpoint, the accurate knowledge of the thermodynamics of such polymer-solvent mixtures can be extremely beneficial to optimally model and design polymer plants, control stream compositions going into upstream units and importantly, abide the strict measures on final product quality, thereby creating a significant industrial impact. Furthermore, such analysis can be extended to systems with similar characteristics, providing support to the ongoing research and contribute to the innovation in the field of polymer processing [5,6].…”

Section: Introductionmentioning

confidence: 94%

Modelling Sorption Thermodynamics and Mass Transport of n-Hexane in a Propylene-Ethylene Elastomer

Tammaro¹,

Lombardi²,

Scherillo³

et al. 2021

Preprint

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Optimization of post polymerization devolatilization process of polyolefin elastomers (POE) is of considerable industrial interest. To this aim, experimental determination and theoretical interpretation of the thermodynamics and mass transport properties of POE-solvent mixtures is relevant. Sorption behaviour of n-hexane vapour in a commercial propylene-ethylene elastomer (V8880 VistamaxxTM from ExxonMobil) is addressed here, determining experimentally the sorption isotherms at temperatures ranging from 115 to 140 °C and pressure values of n-hexane vapour up to 1 atm. Sorption isotherms have been interpreted with the Non-Random-Hydrogen-Bonding Equation of State model retrieving, from data fitting, the value of the binary interaction parameter for the n-hexane/V8880 system. Both the case of temperature-independent and of temperature-dependent binary interaction parameter have been considered. Sorption kinetics was also investigated at different pressures and has been interpreted using a Fick’s model determining values of the mutual diffusivity as a function of temperature and of n-hexane/V8880 mixture composition. From these values, n-hexane intra-diffusion coefficient has been calculated interpreting its dependence on mixture concentration and temperature by a semi-empiric model based on free volume arguments.

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Processing and Properties of Polyolefin Elastomers and Fully Hydrogenated Styrenic Block Copolymer Elastomers

Cited by 25 publications

References 1 publication

Organoclay localization in polyamide 6/ethylene-butene copolymer grafted maleic anhydride blends: the effect of different types of organoclay

Organoclay localization in polyamide 6/ethylene-butene copolymer grafted maleic anhydride blends: the effect of different types of organoclay

Control of Mechanical Behavior in Polyolefin Composites: Integration of Glassy, Rubbery, and Semicrystalline Components

Modelling Sorption Thermodynamics and Mass Transport of n-Hexane in a Propylene-Ethylene Elastomer

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