Preparation and characterization of poly(ethylene-graft-ethylene oxide)

Halldén, Åsa; Wesslén, Bengt

doi:10.1002/(sici)1097-4628(19960627)60:13<2495::aid-app20>3.0.co;2-2

Cited by 19 publications

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“…4,5 Even the introduction of a small amount of polar functionality into polyolefins would open new possibilities for macromolecular grafting and reactive compatibilization. 6,7 In search of a convenient method for the functionalization of polyolefins, we considered previous work aimed at the functionalization of alkanes. [8][9][10][11][12][13][14][15][16] Historically, functionalization of alkanes has been achieved via free radical reactions, where highly reactive species can effectively functionalize these inert substrates.…”

Section: Introductionmentioning

confidence: 99%

Selective and Mild Oxyfunctionalization of Model Polyolefins

Boaen

Hillmyer

2003

Macromolecules

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The direct oxyfunctionalization of a model polyolefin, polyethylene-alt-propylene (PEP), was achieved utilizing a straightforward, mild process. In the presence of a manganese complex, manganese meso-tetra-2,6-dichlorophenylporphyrin acetate (Mn(TDCPP)OAc), imidazole, a phase transfer agent, and potassium peroxymonosulfate (Oxone), PEP was functionalized under ambient conditions without chain degradation. The primary oxidation products contained tertiary alcohols and ketones based on IR, 1 H NMR, 13 C NMR, and DEPT 13 C NMR spectroscopy of the oxyfunctionalized products. The oxyfunctionalization of squalane, a small molecule, structural analogue of PEP, was also demonstrated. Spectroscopic analyses of the main products from the squalane oxidation were nearly identical with the functional groups identified in the PEP oxidation products. The degree of functionalization was modulated by changing the relative concentration of the oxidant, Oxone. The degree of functionalization and the thermal properties are reported for these new polymeric materials.

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Section: Introductionmentioning

confidence: 99%

Selective and Mild Oxyfunctionalization of Model Polyolefins

Boaen

Hillmyer

2003

Macromolecules

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“…Incorporation of polar functionality along the backbone [10][11][12] or on branches 13 of these commercially useful macromolecules would lead to materials that display enhanced properties (e.g., adhesive and barrier 14 ), that would be useful as blend compatibilizers, 15 and that could be used as macroinitiators to prepare graft copolymers. 16,17 A selective functionalization of commodity polyolefins would bypass the challenge of developing highly active polymerization catalysts that both tolerate and incorporate functionalized comonomers. 10,11,18 We show that the rhodium-catalyzed alkane borylation, in conjunction with simple oxidation of the alkylboronate esters to alcohols (Scheme 1), 19 effectively forms polyolefins with hydroxyl groups at the terminal positions of branches.…”

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Rhodium-Catalyzed, Regiospecific Functionalization of Polyolefins in the Melt

et al. 2002

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The rhodium-catalyzed, terminal-selective borylation of alkanes has been used to modify polyolefins. The functionalization of two materials, polyethylethylene (PEE) of molecular weights 1200 and 37 000, was conducted by combining bis-pinacoldiboron and 2.5 mol % [Cp*RhCl2]2 in neat polymer and heating at 150 degrees C. This procedure causes the polymer and boron reagent to melt, the catalyst to dissolve, and the reaction to form material with boryl groups at the terminal position of the polymer side chains. Oxidation of the borylated material generated polymers with hydroxyl groups at the terminal position of the side chains. The functionalization was conducted at various ratios of boron reagent to monomer. The resulting borylated and subsequent hydoxylated materials were characterized by 1H and 13C NMR spectroscopy, as well as MALDI-MS and GPC. Little change in polymer molecular weight and polydispersity was observed, and these data indicate that scission of the main chain does not occur. Measurements of the Tg of the polymers showed in increase in Tg of up to 50 degrees C after the modification. Thus, homogeneous, catalytic, selective alkane functionalization can be used to modify polymer properties.

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Surface modification of LDPE with PE-PEO graft copolymer

Halldén¹,

Wesslén²

2000

J. Appl. Polym. Sci.

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Films of LDPE containing 1–10 wt % of various polymeric additives were prepared by different techniques. Three poly(ethylene‐graft‐ethylene oxide)s synthesized by grafting poly(ethylene‐co‐acrylic acid) with poly(ethylene oxide) monomethyl ether (MPEO), and two pure MPEOs having molecular weights 750 and 2000 were used as additives. The additives were mixed with LDPE both by blending in a common solvent and by melt mixing. The blends were then solvent cast from xylene onto glass Petri dishes or compression molded between glass plates. The film surfaces were studied by water contact angle measurements and by X‐ray photoelectron spectroscopy (XPS), and melting points and heats of melting were recorded by differential scanning calorimetry (DSC). The blends had a two‐phase morphology, with enrichment of the graft copolymers at the glass–polymer interface, as shown by contact angle values and XPS spectra. Large differences in the interface accumulation between the different film samples were observed. Films prepared by compression molding of solution‐mixed blends exhibited much lower surface accumulation of graft copolymer at the glass–polymer interface than did the solvent cast or melt‐mixed/compression‐molded samples. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 316–326, 2000

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Preparation and characterization of poly(ethylene-graft-ethylene oxide)

Cited by 19 publications

References 0 publications

Selective and Mild Oxyfunctionalization of Model Polyolefins

Selective and Mild Oxyfunctionalization of Model Polyolefins

Rhodium-Catalyzed, Regiospecific Functionalization of Polyolefins in the Melt

Surface modification of LDPE with PE-PEO graft copolymer

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