Production of Ultrahigh‐Molecular‐Weight Polyethylene/Pristine MWCNT Composites by Half‐Titanocene Catalysts

Park, Sung Jin; Choi, Insung S.

doi:10.1002/adma.200801674

Cited by 38 publications

(25 citation statements)

References 25 publications

(24 reference statements)

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“…nanocomposites by using in situ polymerization with a metallocene catalyst, Sánchez et al [9] reported the preparation of UHMWPE/MWCNT nanocomposite using a TpTiCl 2 (Et) system and Park and Choi [17] attained UHMWPE/MWCNT nanocomposites by using half-titanocene catalytic system.…”

mentioning

confidence: 99%

UHMWPE/SBA-15 nanocomposites synthesized by in situ polymerization

Ferreira

Cerrada

Pérez

et al. 2016

Microporous and Mesoporous Materials

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mentioning

confidence: 99%

UHMWPE/SBA-15 nanocomposites synthesized by in situ polymerization

Ferreira

Cerrada

Pérez

et al. 2016

Microporous and Mesoporous Materials

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“…401 MWCNT/ultrahigh-molecular-weight polyethylene composites, where pristine MWCNTs were well dispersed in the matrices, were produced using MWCNT/half-titanocene hybrids as catalysts. 395 The diameter of the polyethylene-coated MWCNT strands produced is about 30-70 nm, while the diameter of the pristine MWCNTs used is 10-15 nm. Composites with a molecular weight greater than 2 × 10 6 were produced.…”

Section: Polymerization Catalysis Through Non-covalent Immobilizationmentioning

confidence: 99%

“…This method has been successfully reported in several publications about the π-π interaction between the surface of the nanocarbons and the aromatic moieties of various metallocenes. 366,367,[393][394][395][396][397][398][399][400][401] Theoretical calculations have shown that MCp 2 @SWCNT composites were stabilized by weak π-stacking and CH~π interactions, and in the case of the CoCp 2 @SWCNT composites there was an additional electrostatic contribution as a result of charge transfer from CoCp 2 to the nanotube. 402 However, compared to a covalent bond, the π-π interaction is much weaker.…”

Section: Polymerization Catalysis Through Non-covalent Immobilizationmentioning

confidence: 99%

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

2015

Nanostructured Carbon Materials for Catalysis

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For almost twenty years there has been an increasing interest in the use of nanostructured carbon materials as catalyst supports. 1-16 Following the nanotechnology wave, a wide variety of carbon nanomaterials has been investigated as catalyst supports, including fullerenes, CNTs, CNFs, carbon onions, nanodiamonds, FLG or GO. CNTs and CNFs, which constitute a new family of support offering a good compromise between the advantages of AC and high surface area graphite have been particularly studied. The main advantages offered by CNT or CNF supports are: 17 (i) the high purity of the material can avoid self-poisoning; (ii) the mesoporous nature of these supports can be of interest for liquid-phase reactions, thus limiting the mass transfer; (iii) the high thermal conductivity that limits hot-spots that can damage the catalyst; (iv) their well-defined and tunable structure; (v) their rich surface chemistry that offers numerous perspectives for adsorption and dispersion of the active phase; and (vi) the specific metal support interactions, due to high electrical conductivity of the support and to the tunable orientation of the graphene layers, that exist and that can directly affect catalytic activity and selectivity. The possibility to perform catalysis in a confined space is also of great interest. 6,18 From a theoretical viewpoint, graphene provides the ultimate two-dimensional model of a catalytic support. The reason is related to its high theoretical surface area (ca. 2630 m 2 g −1 ), high conductivity, unique graphitized basal plane structure and chemical tolerance. FLG,

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“…Based on prior reports of an increase in the Mw by bulky and electron‐donating ligands, steric and electronic factors of MWNTs were proposed for a high Mw . The same group further explored CNT‐ligating polymerization catalysts, leading to the identification of a half‐titanocene catalytic system on CNTs furnishing PE of even higher Mw . The precatalyst was prepared in a similar manner using CpTiCl 3 and MWNTs.…”

Section: Noncovalent Immobilization Of Active Catalysts Onto Cntsmentioning

confidence: 99%

Strategic Immobilization of Molecular Catalysts onto Carbon Nanotubes via Noncovalent Interaction for Catalytic Organic Transformations

Kumagai

Shibasaki

2016

Israel Journal of Chemistry

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Since their discovery, carbon nanotubes (CNTs) continue to attract growing interest from scientists in a wide range of fields, likely due to their fascinating nanoarchitecture as well as their electronic and physical properties. From the viewpoint of synthetic chemistry, the chemical and physical stability, high surface area, and π‐stacking nature of CNTs are attractive features for their application as solid supports for molecular catalysts. The chemical functionalization of CNTs has been explored for various applications, including covalent and noncovalent grafting of molecular catalysts. Although noncovalent grafting provides less stable immobilized catalysts compared with covalently grafted hybrid molecular catalysts and CNTs, the preparation protocol is expeditious and repetitive use of the catalysts is well demonstrated, confirming their potential broad utility in synthetic organic chemistry.

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Production of Ultrahigh‐Molecular‐Weight Polyethylene/Pristine MWCNT Composites by Half‐Titanocene Catalysts

Cited by 38 publications

References 25 publications

UHMWPE/SBA-15 nanocomposites synthesized by in situ polymerization

UHMWPE/SBA-15 nanocomposites synthesized by in situ polymerization

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

Strategic Immobilization of Molecular Catalysts onto Carbon Nanotubes via Noncovalent Interaction for Catalytic Organic Transformations

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