Unusual chain configuration of main-chain liquid crystal polyesters having Y-shaped mesogens in nematic phase
The nematic liquid crystals of main-chain liquid crystalline (MCLC) Y- n polyesters were investigated and compared with those of conventional MCLC L- n polyesters. Y- n polyesters have Y-shaped mesogens that are connected by spacers at their branch ends as an alternative to the columitic mesogens of...
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| Veröffentlicht in: | Polymer (Guilford) 2011-11, Vol.52 (25), p.5830-5835 |
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| creator | Tokita, Masatoshi Kato, Kazuya Ishige, Ryohei Okuda, Shuhei Kawauchi, Susumu Okoshi, Kento Kang, Sungmin Watanabe, Junji |
| description | The nematic liquid crystals of main-chain liquid crystalline (MCLC) Y-
n polyesters were investigated and compared with those of conventional MCLC L-
n polyesters. Y-
n polyesters have Y-shaped mesogens that are connected by spacers at their branch ends as an alternative to the columitic mesogens of L-
n polyesters. The nematic phases of both polyesters under polarized optical microscopy exhibited Schlieren textures that are typical of uniaxial nematic liquid crystals. The isotropization temperature and entropy change estimated by differential scanning calorimetry show odd–even oscillations, which are characteristic of MCLC polymers, and the entropy change of Y-
n are significantly smaller than those of L-
n. Such a low entropy change is associated with the Y-
n chain configuration, which is unusual for MCLC polymers, as revealed by X-ray diffraction and infrared dichroic spectroscopy. The uniaxial nematic structure is formed by Y-shaped mesogens arranging their trunks along the director direction and being rotated about their trunks without any correlation. Connecting these mesogens by using spacers that are placed preferentially along the director enables us to depict the chain that oscillates along the director direction and performs a random walk in the direction perpendicular to the director.
[Display omitted] |
| doi_str_mv | 10.1016/j.polymer.2011.10.047 |
| format | Article |
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n polyesters were investigated and compared with those of conventional MCLC L-
n polyesters. Y-
n polyesters have Y-shaped mesogens that are connected by spacers at their branch ends as an alternative to the columitic mesogens of L-
n polyesters. The nematic phases of both polyesters under polarized optical microscopy exhibited Schlieren textures that are typical of uniaxial nematic liquid crystals. The isotropization temperature and entropy change estimated by differential scanning calorimetry show odd–even oscillations, which are characteristic of MCLC polymers, and the entropy change of Y-
n are significantly smaller than those of L-
n. Such a low entropy change is associated with the Y-
n chain configuration, which is unusual for MCLC polymers, as revealed by X-ray diffraction and infrared dichroic spectroscopy. The uniaxial nematic structure is formed by Y-shaped mesogens arranging their trunks along the director direction and being rotated about their trunks without any correlation. Connecting these mesogens by using spacers that are placed preferentially along the director enables us to depict the chain that oscillates along the director direction and performs a random walk in the direction perpendicular to the director.
[Display omitted]</description><identifier>ISSN: 0032-3861</identifier><identifier>EISSN: 1873-2291</identifier><identifier>DOI: 10.1016/j.polymer.2011.10.047</identifier><identifier>CODEN: POLMAG</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Applied sciences ; Chain configuration ; Chains (polymeric) ; crystals ; differential scanning calorimetry ; Entropy ; Exact sciences and technology ; Liquid crystals ; Main-chain liquid crystalline polymer ; microscopy ; Nematic ; Nematic liquid crystal ; Organic polymers ; Physicochemistry of polymers ; Polyester resins ; polyesters ; Polymers with particular structures ; Preparation, kinetics, thermodynamics, mechanism and catalysts ; Spacers ; spectroscopy ; temperature ; Texture ; Trunks ; X-ray diffraction</subject><ispartof>Polymer (Guilford), 2011-11, Vol.52 (25), p.5830-5835</ispartof><rights>2011 Elsevier Ltd</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c505t-89f5bfec87f9ba9b911390049cad3b25346371afc063da3b23c7cdb9f19818e13</citedby><cites>FETCH-LOGICAL-c505t-89f5bfec87f9ba9b911390049cad3b25346371afc063da3b23c7cdb9f19818e13</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0032386111008950$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=25289032$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Tokita, Masatoshi</creatorcontrib><creatorcontrib>Kato, Kazuya</creatorcontrib><creatorcontrib>Ishige, Ryohei</creatorcontrib><creatorcontrib>Okuda, Shuhei</creatorcontrib><creatorcontrib>Kawauchi, Susumu</creatorcontrib><creatorcontrib>Okoshi, Kento</creatorcontrib><creatorcontrib>Kang, Sungmin</creatorcontrib><creatorcontrib>Watanabe, Junji</creatorcontrib><title>Unusual chain configuration of main-chain liquid crystal polyesters having Y-shaped mesogens in nematic phase</title><title>Polymer (Guilford)</title><description>The nematic liquid crystals of main-chain liquid crystalline (MCLC) Y-
n polyesters were investigated and compared with those of conventional MCLC L-
n polyesters. Y-
n polyesters have Y-shaped mesogens that are connected by spacers at their branch ends as an alternative to the columitic mesogens of L-
n polyesters. The nematic phases of both polyesters under polarized optical microscopy exhibited Schlieren textures that are typical of uniaxial nematic liquid crystals. The isotropization temperature and entropy change estimated by differential scanning calorimetry show odd–even oscillations, which are characteristic of MCLC polymers, and the entropy change of Y-
n are significantly smaller than those of L-
n. Such a low entropy change is associated with the Y-
n chain configuration, which is unusual for MCLC polymers, as revealed by X-ray diffraction and infrared dichroic spectroscopy. The uniaxial nematic structure is formed by Y-shaped mesogens arranging their trunks along the director direction and being rotated about their trunks without any correlation. Connecting these mesogens by using spacers that are placed preferentially along the director enables us to depict the chain that oscillates along the director direction and performs a random walk in the direction perpendicular to the director.
[Display omitted]</description><subject>Applied sciences</subject><subject>Chain configuration</subject><subject>Chains (polymeric)</subject><subject>crystals</subject><subject>differential scanning calorimetry</subject><subject>Entropy</subject><subject>Exact sciences and technology</subject><subject>Liquid crystals</subject><subject>Main-chain liquid crystalline polymer</subject><subject>microscopy</subject><subject>Nematic</subject><subject>Nematic liquid crystal</subject><subject>Organic polymers</subject><subject>Physicochemistry of polymers</subject><subject>Polyester resins</subject><subject>polyesters</subject><subject>Polymers with particular structures</subject><subject>Preparation, kinetics, thermodynamics, mechanism and catalysts</subject><subject>Spacers</subject><subject>spectroscopy</subject><subject>temperature</subject><subject>Texture</subject><subject>Trunks</subject><subject>X-ray diffraction</subject><issn>0032-3861</issn><issn>1873-2291</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNqFkU-L1DAYh4MoOK5-BDEX8dQxafonOYks7ioseHDnsKfwNk1mMrRJN2kX5tv7lg5ePQV-eX7vG54Q8pGzPWe8-XreT3G4jDbtS8Y5ZntWta_IjstWFGWp-GuyY0yUhZANf0ve5XxmjJV1We3IeAhLXmCg5gQ-UBOD88clwexjoNHREdNiuxv88-J7atIlz1hYd9o825TpCV58ONKnIp9gsj0dbY5HGzLFVrAjDjN0OkG278kbB0O2H67nDTnc_Xi8_Vk8_L7_dfv9oTA1q-dCKld3zhrZOtWB6hTnQjFWKQO96MpaVI1oOTjDGtEDJsK0pu-U40pyabm4IV-2uVOKzwu-Uo8-GzsMEGxcslaNkFKydiXrjTQp5pys01PyI6SL5kyvdvVZX-3q1e4ao13sfb5ugGxgcAmC8flfGeVKhcqR-7RxDqKGY0Lm8AcH1fgDSlW1QuLbRlgU8uJxTzbeBmN7n6yZdR_9f97yFziBnmM</recordid><startdate>20111128</startdate><enddate>20111128</enddate><creator>Tokita, Masatoshi</creator><creator>Kato, Kazuya</creator><creator>Ishige, Ryohei</creator><creator>Okuda, Shuhei</creator><creator>Kawauchi, Susumu</creator><creator>Okoshi, Kento</creator><creator>Kang, Sungmin</creator><creator>Watanabe, Junji</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>FBQ</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>JG9</scope></search><sort><creationdate>20111128</creationdate><title>Unusual chain configuration of main-chain liquid crystal polyesters having Y-shaped mesogens in nematic phase</title><author>Tokita, Masatoshi ; Kato, Kazuya ; Ishige, Ryohei ; Okuda, Shuhei ; Kawauchi, Susumu ; Okoshi, Kento ; Kang, Sungmin ; Watanabe, Junji</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c505t-89f5bfec87f9ba9b911390049cad3b25346371afc063da3b23c7cdb9f19818e13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Applied sciences</topic><topic>Chain configuration</topic><topic>Chains (polymeric)</topic><topic>crystals</topic><topic>differential scanning calorimetry</topic><topic>Entropy</topic><topic>Exact sciences and technology</topic><topic>Liquid crystals</topic><topic>Main-chain liquid crystalline polymer</topic><topic>microscopy</topic><topic>Nematic</topic><topic>Nematic liquid crystal</topic><topic>Organic polymers</topic><topic>Physicochemistry of polymers</topic><topic>Polyester resins</topic><topic>polyesters</topic><topic>Polymers with particular structures</topic><topic>Preparation, kinetics, thermodynamics, mechanism and catalysts</topic><topic>Spacers</topic><topic>spectroscopy</topic><topic>temperature</topic><topic>Texture</topic><topic>Trunks</topic><topic>X-ray diffraction</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tokita, Masatoshi</creatorcontrib><creatorcontrib>Kato, Kazuya</creatorcontrib><creatorcontrib>Ishige, Ryohei</creatorcontrib><creatorcontrib>Okuda, Shuhei</creatorcontrib><creatorcontrib>Kawauchi, Susumu</creatorcontrib><creatorcontrib>Okoshi, Kento</creatorcontrib><creatorcontrib>Kang, Sungmin</creatorcontrib><creatorcontrib>Watanabe, Junji</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><jtitle>Polymer (Guilford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tokita, Masatoshi</au><au>Kato, Kazuya</au><au>Ishige, Ryohei</au><au>Okuda, Shuhei</au><au>Kawauchi, Susumu</au><au>Okoshi, Kento</au><au>Kang, Sungmin</au><au>Watanabe, Junji</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Unusual chain configuration of main-chain liquid crystal polyesters having Y-shaped mesogens in nematic phase</atitle><jtitle>Polymer (Guilford)</jtitle><date>2011-11-28</date><risdate>2011</risdate><volume>52</volume><issue>25</issue><spage>5830</spage><epage>5835</epage><pages>5830-5835</pages><issn>0032-3861</issn><eissn>1873-2291</eissn><coden>POLMAG</coden><abstract>The nematic liquid crystals of main-chain liquid crystalline (MCLC) Y-
n polyesters were investigated and compared with those of conventional MCLC L-
n polyesters. Y-
n polyesters have Y-shaped mesogens that are connected by spacers at their branch ends as an alternative to the columitic mesogens of L-
n polyesters. The nematic phases of both polyesters under polarized optical microscopy exhibited Schlieren textures that are typical of uniaxial nematic liquid crystals. The isotropization temperature and entropy change estimated by differential scanning calorimetry show odd–even oscillations, which are characteristic of MCLC polymers, and the entropy change of Y-
n are significantly smaller than those of L-
n. Such a low entropy change is associated with the Y-
n chain configuration, which is unusual for MCLC polymers, as revealed by X-ray diffraction and infrared dichroic spectroscopy. The uniaxial nematic structure is formed by Y-shaped mesogens arranging their trunks along the director direction and being rotated about their trunks without any correlation. Connecting these mesogens by using spacers that are placed preferentially along the director enables us to depict the chain that oscillates along the director direction and performs a random walk in the direction perpendicular to the director.
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| subjects | Applied sciences Chain configuration Chains (polymeric) crystals differential scanning calorimetry Entropy Exact sciences and technology Liquid crystals Main-chain liquid crystalline polymer microscopy Nematic Nematic liquid crystal Organic polymers Physicochemistry of polymers Polyester resins polyesters Polymers with particular structures Preparation, kinetics, thermodynamics, mechanism and catalysts Spacers spectroscopy temperature Texture Trunks X-ray diffraction |
| title | Unusual chain configuration of main-chain liquid crystal polyesters having Y-shaped mesogens in nematic phase |
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