Separation of bimodal high density polyethylene using multidimensional high temperature liquid chromatography

Prabhu, K. Narayan; Brüll, Robert; Macko, Tibor; Remerie, Klaas; Tacx, J.C.J.F.; Garg, Priya; Ginzburg, Anton

doi:10.1016/j.chroma.2015.09.078

Cited by 19 publications

(8 citation statements)

References 92 publications

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“…The viscosity measurements of the rest of the calibrating samples are reported in Supplemental Material. Table 1: Experimental results of Intrinsic Viscosity of the calibrating HDPE samples (2,3,4,5).…”

Section: Resultsmentioning

confidence: 99%

“…However the machines can be expensive, are quite delicate and the measurements can take several hours. Furthermore, it is extremely difficult to accurately measure the MWD of high molecular weight products with SEC [3,4]. Simple methods like measuring the melt flow rate or melt flow index are often used at production sites as these methods are quick, easy and robust.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of viscosity average molar masses of polyethylene in a wide range using rheological measurements with a harmless solvent

Taha

Bounor‐Legaré

Andrade

et al. 2021

International Journal of Polymer Analysis and Characterization

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of viscosity average molar masses of polyethylene in a wide range using rheological measurements with a harmless solvent

Taha

Bounor‐Legaré

Andrade

et al. 2021

International Journal of Polymer Analysis and Characterization

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“…Very often, polyolefin materials comprise complex mixtures of differing molar mass or chemical composition. Typical examples include heterophasic ethylene-propylene copolymers (HPEPCs) and bimodal high-density polyethylene (bHDPE). − Broad molecular distributions allow polyolefin materials to exhibit remarkable physical and mechanical properties while maintaining relatively easy processability. For example, bHDPE consists of low molar mass PE, high molar mass PE, and some copolymer components.…”

Section: Resultsmentioning

confidence: 99%

Advanced Liquid Chromatography of Polyolefins Using Simultaneous Solvent and Temperature Gradients

2020

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Olefin copolymers are complex polymer materials that exhibit multiple distributions in molecular properties such as molar mass, chemical composition, and branching. To address the multivariate molecular compositions, chromatographic protocols have been developed that synergistically combine solvent and temperature gradients. As representative examples, blends of olefin copolymers have been fractionated on porous graphitic carbon stationary phases. This is the first study that makes complementary use of solvent and temperature gradient interaction chromatography (SGIC and TGIC, respectively) to capitalize on the advantages of both techniques. In a first experimental setup, solvent and temperature gradients were used simultaneously and complex blends of low molar mass polyethylene and ethylene-co-1-octene copolymers were separated with high efficiency. The separation of oligomers was observed to be significantly better in SGIC as compared to TGIC, while comonomer blends could be separated in either TGIC or SGIC mode. In another innovation, a two-column setup was employed where the columns were placed in different temperature zones. It was demonstrated that the separation of both low and high comonomer content blends was improved significantly when the temperatures of the two zones were manipulated reasonably.

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“…[2] In some unique cases, polyolefin alloys-mixtures and copolymers are used to tackle important industrial needs where homopolymers would fail. Heterophasic ethylene-propylene copolymers (HPEPCs) [3][4][5] and bimodal high-density polyethylene (bHDPE) [2,[6][7][8][9] are typical examples of polyolefin materials synthesized from a cascade of reactors with proprietary catalyst technologies. [10] Such unique and complex polyolefin materials allow for important industrial applications but are challenging to be characterized.…”

Section: Introductionmentioning

confidence: 99%

Reverse Engineering of Chemically Similar Bimodal High Density Polyethylenes: A Comprehensive Study Using Advanced Chromatographic Techniques

Ndiripo

Lamola

Ndlovu

et al. 2022

Macro Materials & Eng

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Bimodal high‐density polyethylene (bHDPE) is a complex, multicomponent polyethylene (PE) material whose synthesis in a multistage process can be challenging. Three bHDPEs with good and bad end‐use properties are reverse engineered using advanced analytical techniques. Average chemical composition is determined using 13C NMR and 1‐butene is identified as the comonomer for the good resin (bHDPE 1) while 1‐hexene is the comonomer in bHDPE 2 and 3. The presence of comonomer in the high molar mass fractions of the samples is shown using high‐temperature triple‐detection size exclusion chromatography (HT‐SEC‐d3). Chemical composition separation using high‐temperature interaction chromatography (HT‐IC) is achieved using porous graphitic carbon (PGC) and silica stationary phases. Some problems in temperature gradient interaction chromatography (TGIC) on PGC are overcome by using a non‐adsorptive stationary phase, enabling better separation and visualization of homopolymer and copolymer components. Coupling HT‐SEC in 2D liquid chromatography (2D‐LC) analyses at high temperatures reveals the presence of a larger copolymer component in bHDPE 1 at high elution volume. In contrast, bHDPE 2 and bHDPE 3 have copolymer components at low elution volumes, indicating poor comonomer distribution in the copolymer component which ultimately explains the poor mechanical properties at similar comonomer contents.

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Separation of bimodal high density polyethylene using multidimensional high temperature liquid chromatography

Cited by 19 publications

References 92 publications

Determination of viscosity average molar masses of polyethylene in a wide range using rheological measurements with a harmless solvent

Determination of viscosity average molar masses of polyethylene in a wide range using rheological measurements with a harmless solvent

Advanced Liquid Chromatography of Polyolefins Using Simultaneous Solvent and Temperature Gradients

Reverse Engineering of Chemically Similar Bimodal High Density Polyethylenes: A Comprehensive Study Using Advanced Chromatographic Techniques

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