Cybotactic nematic phase in main-chain polyesters with bent-core mesogens

被引:7
作者
Choi, E-Joon [1 ]
Seo, Young-Ho [1 ]
Kamal, Tahseen [2 ]
Park, Soo-Young [2 ]
Watanabe, Junji [3 ]
机构
[1] Kumoh Natl Inst Technol, Dept Polymer Sci & Engn, Gumi 730701, Gyungbuk, South Korea
[2] Kyungpook Natl Univ, Dept Polymer Sci & Engn, Taegu 702701, South Korea
[3] Tokyo Inst Technol, Dept Organ & Polymer Mat, Meguro Ku, Tokyo 1528552, Japan
基金
新加坡国家研究基金会;
关键词
Synthesis of liquid crystalline polymers; Bent-core mesogen; Cybotactic nematic phase; LIQUID-CRYSTALS; MESOMORPHIC PROPERTIES; MICRO-SEGREGATION; SHAPED MOLECULES; SMECTIC PHASE; POLYMERS; MESOPHASE; SCATTERING; CHIRALITY; FIELD;
D O I
10.1016/j.polymer.2014.02.050
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
New six main-chain polyesters containing bent-core rnesogens with various central units (Ar = 1,2-or 1,3-phenylene and 1,6-, 1,7-, 2,3-or 2,7-naphthylene) were synthesized. All of the polymers were soluble in a mixture of phenol/p-chlorophenol/TCE (25/40/35 w/w/w). The inherent viscosities were in the range of 0.18-0.38 dl./g. Despite the existence of bent-core mesogens eliciting a remarkable diminution of molecular packing, polymer with Ar = 2,7-naphthylene formed a smectic phase, and polymers with both Ar = 1,2-phenylene and 2,3-naphthylene formed nematic phases. Moreover, most of the polymers were distinctly semi-crystalline. Herein, we report our findings regarding the first detection of cybotactic groups from the nematic phases of main-chain polyesters with bent-core mesogens. (c) 2014 Published by Elsevier Ltd.
引用
收藏
页码:1931 / 1939
页数:9
相关论文
共 57 条
[1]   Biaxial nematic phase in bent-core thermotropic mesogens [J].
Acharya, BR ;
Primak, A ;
Kumar, S .
PHYSICAL REVIEW LETTERS, 2004, 92 (14) :145506-1
[2]   X-RAY-SCATTERING BY CYBOTACTIC NEMATIC MESOPHASES [J].
AZAROFF, LV .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-PHYSICAL SCIENCES, 1980, 77 (03) :1252-1254
[3]   A Liquid-Crystalline Co-Polysiloxane with Asymmetric Bent Side Chains [J].
Bubnov, Alexej ;
Novotna, Vladimira ;
Pociecha, Damian ;
Kaspar, Miroslav ;
Hamplova, Vera ;
Galli, Giancarlo ;
Glogarova, Milada .
MACROMOLECULAR CHEMISTRY AND PHYSICS, 2011, 212 (02) :191-197
[4]   A low-molar-mass, monodispersive, bent-rod dimer exhibiting biaxial nematic and smectic a phases [J].
Channabasaveshwar, V ;
Prasad, YSK ;
Nair, GG ;
Shashikala, IS ;
Rao, DSS ;
Lobo, CV ;
Chandrasekhar, S .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2004, 43 (26) :3429-3432
[5]   Side-chain liquid crystalline poly(meth)acrylates with bent-core mesogens [J].
Chen, Xiaofang ;
Tenneti, Kishore K. ;
Li, Christopher Y. ;
Bai, Yaowen ;
Wan, Xinhua ;
Fan, Xinghe ;
Zhou, Qi-Feng ;
Rong, Lixia ;
Hsiao, Benjamin S. .
MACROMOLECULES, 2007, 40 (04) :840-848
[6]   Anticlinic antiferroelectric smectic liquid crystal formed by an asymmetric banana-shaped molecule [J].
Choi, E-Joon ;
Cui, Xin ;
Zin, Wang-Cheol ;
Ohk, Chang-Woo ;
Lim, Tong-Kun ;
Lee, Ji-Hoon .
CHEMPHYSCHEM, 2007, 8 (13) :1919-1923
[7]   Electro-optical properties of the nematic phase in V-shaped molecules with a 2,3-naphthalene central unit [J].
Choi, E-Joon ;
Seo, Young-Ho ;
Park, Sang-Byung ;
Zin, Wang-Cheol ;
Song, Dong Han ;
Lee, Gak Seok ;
Yoon, Tae-Hoon ;
Lee, Ji-Hoon .
JOURNAL OF MATERIALS CHEMISTRY C, 2013, 1 (03) :451-455
[8]   Smectic A phase in a new bent-shaped mesogen based on a 2,3-naphthalene central core with an acute-subtended angle [J].
Choi, E-Joon ;
Cui, Xin ;
Ohk, Chang-Woo ;
Zin, Wang-Cheol ;
Lee, Ji-Hoon ;
Lim, Tong-Kun ;
Jang, Won-Gun .
JOURNAL OF MATERIALS CHEMISTRY, 2010, 20 (18) :3743-3749
[9]   Synthesis and Mesomorphic Properties of Main-Chain Polymers Containing V-Shaped Bent-Core Mesogens with Acute-Subtended Angle [J].
Choi, E-Joon ;
Kim, Eun-Chol ;
Ohk, Chang-Woo ;
Zin, Wang-Cheol ;
Lee, Ji-Hoon ;
Lim, Tong-Kun .
MACROMOLECULES, 2010, 43 (06) :2865-2872
[10]   Main chain polymers containing banana-shaped mesogens: Synthesis and mesomorphic properties [J].
Choi, EJ ;
Ahn, JC ;
Chien, LC ;
Lec, CK ;
Zin, WC ;
Kim, DC ;
Shin, ST .
MACROMOLECULES, 2004, 37 (01) :71-78