Effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic ABA symmetric triblock copolymer solutions
The effects of the length of each hydrophobic end block Nst and polymer concentration φP on the transition broadness in amphiphilic ABA symmetric triblock copolymer solutions are studied using the self-consistent field lattice model. When the system is cooled, micelles are observed, i.e.,the homogen...
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| Дата: | 2013 |
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| Автори: | , , |
| Формат: | Стаття |
| Мова: | English |
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Інститут фізики конденсованих систем НАН України
2013
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/120834 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic ABA symmetric triblock copolymer solutions / X.-G. Han, Y.-H. Ma, S.-L. Ouyang // Condensed Matter Physics. — 2013. — Т. 16, № 3. — С. 33601:1-8. — Бібліогр.: 22 назв. — англ. |
Репозитарії
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irk-123456789-1208342017-06-14T03:03:27Z Effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic ABA symmetric triblock copolymer solutions Han, X.-G. Ma, Y.-H. Ouyang, S.-L. The effects of the length of each hydrophobic end block Nst and polymer concentration φP on the transition broadness in amphiphilic ABA symmetric triblock copolymer solutions are studied using the self-consistent field lattice model. When the system is cooled, micelles are observed, i.e.,the homogenous solution (unimer)-micelle transition occurs. When Nst is increased, at fixed φP, micelles occur at higher temperature, and the temperature-dependent range of micellar aggregation and half-width of specific heat peak for unimer-micelle transition increase monotonously. Compared with associative polymers, it is found that the magnitude of the transition broadness is determined by the ratio of hydrophobic to hydrophilic blocks, instead of chain length. When φP is decreased, given a large Nst, the temperature-dependent range of micellar aggregation and half-width of specific heat peak initially decease, and then remain nearly constant. It is shown that the transition broadness is concerned with the changes of the relative magnitudes of the eductions of nonstickers and solvents from micellar cores. Вплив довжини кожного гiдрофобного прикiнцевого блоку Nst i концентрацiї полiмера φ¯P на ширину переходу в симетричних ABA триблочних амфiфiльних кополiмерних розчинах дослiджується шляхом використання ґраткової моделi самоузгодженого поля. Коли система охолоджена, спостерiгаються мiцели, тобто вiдбувається перехiд однорiдний розчин (мономер)-мiцела. Якщо Nst зростає при сталому φ¯P, то мiцели виникають при високiй температурi, а температурно залежна область агрегацiї мiцел i пiвширина пiку питомої теплоємностi для переходу мономер-мiцела зростають монотонно. Порiвнюючи з асоцiативними полiмерами, знайдено, що величина ширини переходу визначається вiдношенням гiдрофобних блокiв до гiдрофiльних, а не довжиною ланцюга. Коли φ¯P зменшується при великому значеннi Nst, температурно залежна область мiцелярної агрегацiї та пiвширина пiку питомої теплоємностi спо-чатку зменшуються, а потiм залишаються майже сталими. Показано, що ширина переходу пов’язана зi змiною вiдносних величин видiлення незв’язувальної речовини i розчинникiв з мiцелярних корiв. 2013 Article Effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic ABA symmetric triblock copolymer solutions / X.-G. Han, Y.-H. Ma, S.-L. Ouyang // Condensed Matter Physics. — 2013. — Т. 16, № 3. — С. 33601:1-8. — Бібліогр.: 22 назв. — англ. 1607-324X PACS: 61.25.Hp, 64.75.+g, 82.60.Fa DOI:10.5488/CMP.16.33601 arXiv:1309.6207 http://dspace.nbuv.gov.ua/handle/123456789/120834 en Condensed Matter Physics Інститут фізики конденсованих систем НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| description |
The effects of the length of each hydrophobic end block Nst and polymer concentration φP on the transition broadness in amphiphilic ABA symmetric triblock copolymer solutions are studied using the self-consistent field lattice model. When the system is cooled, micelles are observed, i.e.,the homogenous solution (unimer)-micelle transition occurs. When Nst is increased, at fixed φP, micelles occur at higher temperature, and the temperature-dependent range of micellar aggregation and half-width of specific heat peak for unimer-micelle transition increase monotonously. Compared with associative polymers, it is found that the magnitude of the transition broadness is determined by the ratio of hydrophobic to hydrophilic blocks, instead of chain length. When φP is decreased, given a large Nst, the temperature-dependent range of micellar aggregation and half-width of specific heat peak initially decease, and then remain nearly constant. It is shown that the transition broadness is concerned with the changes of the relative magnitudes of the eductions of nonstickers and solvents from micellar cores. |
| format |
Article |
| author |
Han, X.-G. Ma, Y.-H. Ouyang, S.-L. |
| spellingShingle |
Han, X.-G. Ma, Y.-H. Ouyang, S.-L. Effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic ABA symmetric triblock copolymer solutions Condensed Matter Physics |
| author_facet |
Han, X.-G. Ma, Y.-H. Ouyang, S.-L. |
| author_sort |
Han, X.-G. |
| title |
Effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic ABA symmetric triblock copolymer solutions |
| title_short |
Effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic ABA symmetric triblock copolymer solutions |
| title_full |
Effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic ABA symmetric triblock copolymer solutions |
| title_fullStr |
Effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic ABA symmetric triblock copolymer solutions |
| title_full_unstemmed |
Effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic ABA symmetric triblock copolymer solutions |
| title_sort |
effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic aba symmetric triblock copolymer solutions |
| publisher |
Інститут фізики конденсованих систем НАН України |
| publishDate |
2013 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/120834 |
| citation_txt |
Effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic ABA symmetric triblock copolymer solutions / X.-G. Han, Y.-H. Ma, S.-L. Ouyang // Condensed Matter Physics. — 2013. — Т. 16, № 3. — С. 33601:1-8. — Бібліогр.: 22 назв. — англ. |
| series |
Condensed Matter Physics |
| work_keys_str_mv |
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2023-10-18T20:38:15Z |
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2023-10-18T20:38:15Z |
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