Grafting density-induced smectic A to hexagonal columnar transition in mesogen-free isotactic liquid crystalline polyethers with n-dodecylsulfonyl side groups
Highly dipolar mesogen-free liquid crystalline polymers are excellent candidates for achieving large spontaneous polarization under relatively low electric fields for advanced electrical and optical applications. In this report, the effect of grafting density of n-dodecylsulfonyl side chains on the...
| Main Authors: | , , , , , |
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| Format: | Article |
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Elsevier
2020-03-01
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| Series: | Giant |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666542520300035 |
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| author | Man-Hin Kwok Caleb A. Bohannon Jordan L. Crooks Ruipeng Li Bin Zhao Lei Zhu |
| author_facet | Man-Hin Kwok Caleb A. Bohannon Jordan L. Crooks Ruipeng Li Bin Zhao Lei Zhu |
| author_sort | Man-Hin Kwok |
| collection | DOAJ |
| description | Highly dipolar mesogen-free liquid crystalline polymers are excellent candidates for achieving large spontaneous polarization under relatively low electric fields for advanced electrical and optical applications. In this report, the effect of grafting density of n-dodecylsulfonyl side chains on the mesogen-free liquid crystalline self-assembly of comb-like isotactic poly(oxypropylene) was studied. When the grafting density was 80–100%, a stable 21 helical chain conformation was induced by the strong dipole-dipole interactions among the sulfonyl groups in the side chains. Consequently, a smectic A self-assembly was induced. When the grafting density decreased to 60–80%, a poor and possibly imbalanced 21 helical chain conformation was formed due to the frequent absence of the n-dodecylsulfonyl side chains along the main chain. As a result, a hexagonal columnar self-assembly was realized. This study demonstrated that a delicate interplay between the molecular defects and dipole-dipole interactions can lead to different self-assembly structures. |
| first_indexed | 2024-12-12T11:36:24Z |
| format | Article |
| id | doaj.art-190e53bf157d490899d88a6aef2588a9 |
| institution | Directory Open Access Journal |
| issn | 2666-5425 |
| language | English |
| last_indexed | 2024-12-12T11:36:24Z |
| publishDate | 2020-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Giant |
| spelling | doaj.art-190e53bf157d490899d88a6aef2588a92022-12-22T00:25:38ZengElsevierGiant2666-54252020-03-011100003Grafting density-induced smectic A to hexagonal columnar transition in mesogen-free isotactic liquid crystalline polyethers with n-dodecylsulfonyl side groupsMan-Hin Kwok0Caleb A. Bohannon1Jordan L. Crooks2Ruipeng Li3Bin Zhao4Lei Zhu5Department of Macromolecular Science and Engineering and Department of Chemistry, Case Western Reserve University, Cleveland, OH 44106-7202, United StatesDepartment of Chemistry, University of Tennessee, Knoxville, TN 37996, United StatesDepartment of Chemistry, University of Tennessee, Knoxville, TN 37996, United StatesNational Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United StatesDepartment of Chemistry, University of Tennessee, Knoxville, TN 37996, United States; Corresponding authors.Department of Macromolecular Science and Engineering and Department of Chemistry, Case Western Reserve University, Cleveland, OH 44106-7202, United States; Corresponding authors.Highly dipolar mesogen-free liquid crystalline polymers are excellent candidates for achieving large spontaneous polarization under relatively low electric fields for advanced electrical and optical applications. In this report, the effect of grafting density of n-dodecylsulfonyl side chains on the mesogen-free liquid crystalline self-assembly of comb-like isotactic poly(oxypropylene) was studied. When the grafting density was 80–100%, a stable 21 helical chain conformation was induced by the strong dipole-dipole interactions among the sulfonyl groups in the side chains. Consequently, a smectic A self-assembly was induced. When the grafting density decreased to 60–80%, a poor and possibly imbalanced 21 helical chain conformation was formed due to the frequent absence of the n-dodecylsulfonyl side chains along the main chain. As a result, a hexagonal columnar self-assembly was realized. This study demonstrated that a delicate interplay between the molecular defects and dipole-dipole interactions can lead to different self-assembly structures.http://www.sciencedirect.com/science/article/pii/S2666542520300035Mesogen-free liquid crystalline polymerComb-like polymersGrafting densityDipole-dipole interactionHexagonal columnar phase |
| spellingShingle | Man-Hin Kwok Caleb A. Bohannon Jordan L. Crooks Ruipeng Li Bin Zhao Lei Zhu Grafting density-induced smectic A to hexagonal columnar transition in mesogen-free isotactic liquid crystalline polyethers with n-dodecylsulfonyl side groups Giant Mesogen-free liquid crystalline polymer Comb-like polymers Grafting density Dipole-dipole interaction Hexagonal columnar phase |
| title | Grafting density-induced smectic A to hexagonal columnar transition in mesogen-free isotactic liquid crystalline polyethers with n-dodecylsulfonyl side groups |
| title_full | Grafting density-induced smectic A to hexagonal columnar transition in mesogen-free isotactic liquid crystalline polyethers with n-dodecylsulfonyl side groups |
| title_fullStr | Grafting density-induced smectic A to hexagonal columnar transition in mesogen-free isotactic liquid crystalline polyethers with n-dodecylsulfonyl side groups |
| title_full_unstemmed | Grafting density-induced smectic A to hexagonal columnar transition in mesogen-free isotactic liquid crystalline polyethers with n-dodecylsulfonyl side groups |
| title_short | Grafting density-induced smectic A to hexagonal columnar transition in mesogen-free isotactic liquid crystalline polyethers with n-dodecylsulfonyl side groups |
| title_sort | grafting density induced smectic a to hexagonal columnar transition in mesogen free isotactic liquid crystalline polyethers with n dodecylsulfonyl side groups |
| topic | Mesogen-free liquid crystalline polymer Comb-like polymers Grafting density Dipole-dipole interaction Hexagonal columnar phase |
| url | http://www.sciencedirect.com/science/article/pii/S2666542520300035 |
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