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Synthesis and characterization of an inorganic-organic hybrid bent-core liquid crystal with a cubic silsesquioxane core
Pan Qiwei; Chen Xiaofang; Shen Zhihao; Fan Xinghe; Zhou Qifeng
2008-07-20
Source PublicationACTA POLYMERICA SINICA
ISSN1000-3304
Issue7Pages:703-707
AbstractAn organic-inorganic hybrid bent-core liquid crystal (BCLC) with eight bent-core mesogens end-attached to inorganic polyhedral oligomeric silsesquioxanes (POSS) cores was synthesized and characterized to study how the inorganic cubic core May affect the liquid crystalline phase behavior and electro-optical properties of the BCLC. POSS-8BC was successfully synthesized by hydrosilylation reaction of Q(8)M(8)(II) and 3'-[4-(4-dodecyloxybenzoyloxy)benzoyloxy]-4-(10-undecen-1-yloxy)benzoyloxybiphenyl with P1 (dvs) as catalyst in high yield. Well-defined chemical structure of POSS-8BC was confirmed by NMR, IR, elemental analysis, and GPC. Liquid crystalline phase behavior of this compound was investigated by differential scanning calorimetry, 1D and 2D wide-angle X-ray diffractions, and small-angle X-ray scattering. Meanwhile, electro-optical characterization was carried out by applying a triangular wave electric field. Response current was measured, and texture change under the electric field was observed. Two bilayer antiferroelectric SmC phases call be confirmed for POSS-8BC. In the higher temperature LC phase, the arrangement of POSS cores in the layer is not ordered. It is a conventional SmCA2PA phase with layer thickness of 8.0 nm. In the lower temperature LC phase, layer thickness decreases to 7.7 nm. POSS cores from it two-dimensionally ordered structure between two bilayers. It is it bilayer SmCAPA phase with inorganic nano-size mesophase dispersed in it. To our best knowledge, it is the first antiferroelectric LC phase with inorganic nano-size mesophase dispersed in it.
KeywordPoss Bent-core Liquid Crystal Inorganic-organic Hybrid
Indexed BySCI
Language英语
WOS IDWOS:000258755600013
PublisherSCIENCE CHINA PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/64022
Collection中国科学院化学研究所
Corresponding AuthorPan Qiwei
AffiliationPeking Univ, Coll Chem & Mol Engn, Minist Educ, Key Lab Polymer Chem & Phys,Beijing Natl Lab Mol, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Pan Qiwei,Chen Xiaofang,Shen Zhihao,et al. Synthesis and characterization of an inorganic-organic hybrid bent-core liquid crystal with a cubic silsesquioxane core[J]. ACTA POLYMERICA SINICA,2008(7):703-707.
APA Pan Qiwei,Chen Xiaofang,Shen Zhihao,Fan Xinghe,&Zhou Qifeng.(2008).Synthesis and characterization of an inorganic-organic hybrid bent-core liquid crystal with a cubic silsesquioxane core.ACTA POLYMERICA SINICA(7),703-707.
MLA Pan Qiwei,et al."Synthesis and characterization of an inorganic-organic hybrid bent-core liquid crystal with a cubic silsesquioxane core".ACTA POLYMERICA SINICA .7(2008):703-707.
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