Properties of Ethylene-Metal Acrylate Copolymers

Otocka, E. P.; Kwei, T. K.

doi:10.1021/ma60005a006

Cited by 86 publications

(25 citation statements)

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“…The results shown in Tables I and II confirm the results of previous studies: the increase in glass transition temperature is much larger in the neutralized form than in the acidic form of the ionomer,1–7 and this increase does not depend on the alkali metal used 29–32…”

Section: Resultssupporting

confidence: 89%

“…Eisenberg1 reviewed the effect of ions on the temperature of glass transition ( T g ) of ionomers based mainly on styrene,2 butadiene,3 ethyl acrylate,4 and ethylene 5. It has been shown1–6 that the T g of the ionomer is considerably higher than that of the polymer before the introduction of ions. Although no meaningful correlation has yet been found, the effect seems to become more pronounced as the T g of the host material decreases.…”

Section: Introductionmentioning

confidence: 99%

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Intravenous itraconazole for prophylaxis of systemic fungal infections in patients with acute myelogenous leukemia and high‐risk myelodysplastic syndrome undergoing induction chemotherapy

Mattiuzzi

Kantarjian

O’Brien

et al. 2004

Cancer

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The total syntheses of the structurally unique and moderately cytotoxic pyrrolosesquiterpenoid glaciapyrrol A that has been isolated from a marine streptomycete by Macherla et al.1 and of seven of its stereoisomers have been performed from geraniol or nerol, respectively, using a known diastereoselective Ru‐catalysed approach for the synthesis of tetrahydrofurans previously reported by Stark and co‐workers.5 Comparison of 1H and 13C NMR data unambiguously clarified the relative configuration of natural glaciapyrrol A that was previously only partly solved from the available NMR data. An enantioselective synthesis was carried out resulting in the unnatural enantiomer (11S,12R,15R)‐(−)‐glaciapyrrol A. These data establish the absolute configuration of the natural product as (11R,12S,15S)‐(+)‐glaciapyrrol A.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Intravenous itraconazole for prophylaxis of systemic fungal infections in patients with acute myelogenous leukemia and high‐risk myelodysplastic syndrome undergoing induction chemotherapy

Mattiuzzi

Kantarjian

O’Brien

et al. 2004

Cancer

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“…External to these clusters is amorphous polyethylene, linked to the crystalline ethylene phase,u·12 The other view of ionomer structure is that the ionized groups do not aggregate to any great extent but are relatively homogeneously dispersed, possibly as dimers, 13 The following results of a study on a model system tend to support this latter hypothesis with certain reservations. The functional-group content of acid-terminated polybutadienes is lower than that commonly found in copolymer systems, conceivably below some critical value for cluster formation.…”

Section: Introductionmentioning

confidence: 99%

Terminal-Group Association in Carboxy- and Carboxylate-Terminated Polybutadiene

Otocka¹,

Hellman²,

Blyler³

1969

Journal of Applied Physics

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The viscosity of carboxylic-acid-terminated polybutadiene increases markedly upon neutralization with mono-and divalent bases. These viscosity increases are related to apparent molecular weight, considering the association of the terminal salts as "polymerizing" the difunctional prepolymer. For the monovalent alkali-metal salts, simple end-group dimerization seems to occur with an average tJI of ""-25 kcal/mole. Neutralization with ions of higher valency leads to materials with higher viscosities.

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“…In particular, all the neutralized materials investigated behave like systems that are temporarily cross-linked in that either a short rubbery plateau (Otocka and Eirich, 1968) or an additional inflection point (Eisenberg and Navratil, 1973) is present in modulus-time or modulus-temperature curves that is not present in those of the parent materials. Mechanical Properties.…”

Section: Introductionmentioning

confidence: 99%

Modification of polymer properties through ion incorporation

Bazuin¹,

Eisenberg²

1981

Ind. Eng. Chem. Prod. Res. Dev.

152

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This artide desdbes a g w p of k " t a i n l n g polymers calkd homers. the focus being on ethylene-. styrene-, and ethyl acrylate-based materiais. Ion aggregation in these polymers is discussed, extensive experimental evidence indicating two types of aggregates: multiplets and clusters. Attempts to elucidate tl-m sbuchne of ionomers thrwgh models and theories are summarized. Concerning the properties of bulk ionomers. melt viscosities. glass-transition temperatures. and rubbery moduli are shown to be raised drastically by ion introduction. In particular. the effects on the modulus-temperature. stress relaxation. and dynamic mechanical characteristics, on crystallinity, and on melt rheology are examined. Selective plastC cization is also discussed. Where possible. structure-property relations are explained, particulariy as concerns the degree of clustering and the sizes and strengths of clusters. Molecular parameters influencing ion aggregation and ionomer properties include the dielectric constant of the backbone, position and type of ionic group, counterion type, and degree of neutralization. 277. ,

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Properties of Ethylene-Metal Acrylate Copolymers

Cited by 86 publications

References 2 publications

Intravenous itraconazole for prophylaxis of systemic fungal infections in patients with acute myelogenous leukemia and high‐risk myelodysplastic syndrome undergoing induction chemotherapy

Intravenous itraconazole for prophylaxis of systemic fungal infections in patients with acute myelogenous leukemia and high‐risk myelodysplastic syndrome undergoing induction chemotherapy

Terminal-Group Association in Carboxy- and Carboxylate-Terminated Polybutadiene

Modification of polymer properties through ion incorporation

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