Microphase separation in ionomers based on styrene-acrylic acid copolymers

Suchocka-Gałaś, Kazimiera

doi:10.1016/0014-3057(89)90096-7

Cited by 17 publications

(9 citation statements)

References 20 publications

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“…The time of polymerization was chosen so as to achieve a conversion between 15 and 20%. Suitable ionomers were then obtained by titrating (under N 2 ) a 3– 5% solution in benzene (for AA content of about 5 mol %, a 9 : 1 v/v mixture of benzene and methanol was used) by a standard solution of alkali metal hydroxide in methanol 20–25. Some of these solutions were freeze‐dried, and the others were used to obtain films by evaporation of the solvent at room temperature.…”

Section: Methodsmentioning

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: Methodsmentioning

confidence: 99%

“…In our earlier articles,20–24 we indicated that the state of ion aggregation in ionomers based on styrene‐acrylic acid copolymers depends on the amount and the type of the introduced ions of alkali metals and on the placement of ions either at random or in more ordered configurations, such as short blocks along the main chain backbone.…”

Section: Introductionmentioning

confidence: 97%

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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“…For the sodium ionized copolymer, as in the case of these ionomers obtained from copolymers received in bulk, the increase in T g as a function of ion content was linear (dT g /dc = 1.70 K/mol %) up to about 4 mol %, and it was higher than that for the acid form (dT g ./dc = 1.37 K/mol %), but it was also considerably lower than in the case of the ionomers obtained from copolymers received in bulk (dT g /dc = 4.21 K/mol %) 16. This rise in T g may be attributed to ion aggregation into small, tight multiplets 9, 28…”

Section: Resultsmentioning

confidence: 73%

“…In our earlier papers8–14 we indicated that the state of ion aggregation in ionomers based on styrene‐acrylic acid copolymers depends on the amount and the type of the introduced ions of alkali metals and on the method by which the initial copolymer was obtained.…”

Section: Introductionmentioning

confidence: 99%

Some properties of styrene‐based ionomers II

Suchocka-Ga?a?

2005

J of Applied Polymer Sci

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Some properties of styrene-based ionomers obtained from copolymers styrene (S) and acrylic acid (AA) or methacrylic acid (MA) obtained in emulsion containing alkali metal salts have been investigated. A study has been conducted to examine the influence of the acid content and nature (acrylic or methacrylic) and nature of alkali metal salt on the glass transition temperature, density, melt index, and activation energy of flow of the styrene-based ionomers.The present studies have indicated that the temperature of glass transition (T g ) of sodium ionomers increases as the sodium content rises, but the increase is lower than in the case of the ionomers based on copolymers obtained in bulk.The density of films rises with the content of alkali metal salt introduced to the polystyrene chain, and it is higher than in the case of the ionomers based on copolymers obtained in bulk containing almost the same content of alkali metal salts. Styrene ionomers containing alkali metal acrylates have higher densities than those containing alkali metal methacrylates. The melt index of the investigated ionomers depends on the amount and type of introduced acid and salt, as well as on the molecular weight of the initial copolymer.

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“…The suitable ionomers were then obtained by titrating (under N 2 ) a 3-5% solution in benzene (for AA content of about 5 mol%, a 9:1 v/v mixture of benzene and methanol was used) by a standard solution of the alkali metal hydroxide in methanol [22][23][24][25][26][27]. Some of these solutions were freeze-dried, and the others were used to obtain films by evaporation of the solvent at room temperature.…”

Section: Methodsmentioning

confidence: 99%