+Please+confirm+that+given+names+and+surnames%2Ffamily+names+have+been+iden%22&type=AU">Shao, Yu Please verify that the linked ORCID identifiers are correct for each author. The ORCID ID for 'Wenbin Zhang' seems to be invalid. Please check and supply the correct ORCID ID. --> Please confirm that given names and surnames/family names have been iden, Han, Di, Yan, Xiaojin, Hou, Bo, Li, Yiwen, He, Jinlin, Fu, Qiang, Zhang, Wen‐Bin
| Zdroj: |
Chinese Journal of Chemistry; Dec2021, Vol. 39 Issue 12, p3261-3268, 8p |
| Témata: |
SURFACE active agents, ORDER-disorder transitions, MOLECULAR weights, PHASE diagrams, ISOMERS, PHASE transitions, POLYSTYRENE |
| Abstrakt: |
Main observation and conclusion: We report herein the precision synthesis and phase behaviors of multi‐tailed B2AB2‐type regio‐isomeric giant surfactants consisting of a hydrophilic polyhedral oligomeric silsesquioxane (POSS) head tethered with four hydrophobic polystyrene (PS) tails. The synthesis was accomplished through two sequential "click" reactions to give a series of regio‐isomeric giant surfactants S2DS2 (where S is short for PS tails and D for hydroxyl‐functionalized POSS) in para‐, meta‐, and ortho‐configurations. Their phase structures and phase behaviors at the columnar‐spherical boundary were investigated with a single PS tail molecular weight of 1.4 kDa. Specifically, the para‐ and meta‐isomers show hexagonally packed cylinders phases with slightly different order‐disorder transition temperatures (~120 °C and ~130 °C) and the ortho‐isomer exhibits an order‐order transition from a kinetically favored, metastable dodecagonal quasi‐crystal phase to a thermodynamically stable sigma phase at ~120 °C, as well as a further transition into the disordered state at ~140 °C. The phase diagram was constructed and their differences were rationalized based on the calculated interfacial area per molecule. This work demonstrates that tiny structural disparity could not only lead to unconventional phase formation in single‐component macromolecules, but also render dynamic and rich phase behaviors in these macromolecular assemblies. [ABSTRACT FROM AUTHOR] |
| : |
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| Autor: |
Shao, Yu Please verify that the linked ORCID identifiers are correct for each author. The ORCID ID for 'Wenbin Zhang' seems to be invalid. Please check and supply the correct ORCID ID. --> Please confirm that given names and surnames/family names have been iden, Han, Di, Yan, Xiaojin, Hou, Bo, Li, Yiwen, He, Jinlin, Fu, Qiang, Zhang, Wen‐Bin |
| Předmět: |
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| Zdroj: |
Chinese Journal of Chemistry; Dec2021, Vol. 39 Issue 12, p3261-3268, 8p |
| Abstrakt: |
Main observation and conclusion: We report herein the precision synthesis and phase behaviors of multi‐tailed B2AB2‐type regio‐isomeric giant surfactants consisting of a hydrophilic polyhedral oligomeric silsesquioxane (POSS) head tethered with four hydrophobic polystyrene (PS) tails. The synthesis was accomplished through two sequential "click" reactions to give a series of regio‐isomeric giant surfactants S2DS2 (where S is short for PS tails and D for hydroxyl‐functionalized POSS) in para‐, meta‐, and ortho‐configurations. Their phase structures and phase behaviors at the columnar‐spherical boundary were investigated with a single PS tail molecular weight of 1.4 kDa. Specifically, the para‐ and meta‐isomers show hexagonally packed cylinders phases with slightly different order‐disorder transition temperatures (~120 °C and ~130 °C) and the ortho‐isomer exhibits an order‐order transition from a kinetically favored, metastable dodecagonal quasi‐crystal phase to a thermodynamically stable sigma phase at ~120 °C, as well as a further transition into the disordered state at ~140 °C. The phase diagram was constructed and their differences were rationalized based on the calculated interfacial area per molecule. This work demonstrates that tiny structural disparity could not only lead to unconventional phase formation in single‐component macromolecules, but also render dynamic and rich phase behaviors in these macromolecular assemblies. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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