A triphenylene-containing side chain liquid crystalline ladder-like polysiloxane and its highly ordered superstructure

被引:30
作者
Ba, CY
Shen, ZR
Gu, HW
Guo, GQ
Xie, P
Zhang, RB [1 ]
Zhu, CF
Wan, LJ
Li, FY
Huang, CH
机构
[1] Chinese Acad Sci, Polymer Chem Lab, State Key Lab Polymer Phys & Chem, PCLCC, Beijing 100864, Peoples R China
[2] China Petrochem Corp, Beijing, Peoples R China
[3] Chinese Acad Sci, Inst Chem, Ctr Mol Sci, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100080, Peoples R China
[4] Beijing Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
基金
中国国家自然科学基金;
关键词
D O I
10.1080/0267829031000089924
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A liquid crystalline discotic triphenylene-containing side chain ladder-like polysiloxane (LPS) derivative was prepared by hydrosilylation. The superstructure was investigated by X-ray diffraction (XRD), atomic force microscopy (AFM) and isotherm surface pressure (pi)-area ( A) diagrams based on LB-film experiments. The XRD results suggest that the discotic triphenylene units in the side chains stack to form a columnar structure and the columns further align with each other to form a board-like superstructure because of the semi-rigidity of the ladder-like backbone. This suggestion has been confirmed by parallel nanowire-like stripes observed in the AFM image. Mixing small amounts of the corresponding low molar mass molecules with the polymer leads to a more ordered and denser columnar stacking, as shown by sharpened XRD patterns and a pi-A curve with a steeper slope, higher collapse pressure and lower collapse area than those obtained either for the low molar mass molecules or the polymer individually.
引用
收藏
页码:391 / 397
页数:7
相关论文
共 34 条
[1]   FAST PHOTOCONDUCTION IN THE HIGHLY ORDERED COLUMNAR PHASE OF A DISCOTIC LIQUID-CRYSTAL [J].
ADAM, D ;
SCHUHMACHER, P ;
SIMMERER, J ;
HAUSSLING, L ;
SIEMENSMEYER, K ;
ETZBACH, KH ;
RINGSDORF, H ;
HAARER, D .
NATURE, 1994, 371 (6493) :141-143
[2]   MONOLAYERS OF ROD-SHAPED AND DISK-SHAPED LIQUID-CRYSTALLINE COMPOUNDS AT THE AIR-WATER-INTERFACE [J].
ALBRECHT, O ;
CUMMING, W ;
KREUDER, W ;
LASCHEWSKY, A ;
RINGSDORF, H .
COLLOID AND POLYMER SCIENCE, 1986, 264 (08) :659-667
[3]   SYNTHESIS AND PROPERTIES OF HIGH-TEMPERATURE MESOMORPHIC POLYSILOXANE SOLVENTS - BIPHENYL-BASED AND TERPHENYL-BASED NEMATIC SYSTEMS [J].
APFEL, MA ;
FINKELMANN, H ;
JANINI, GM ;
LAUB, RJ ;
LUHMANN, BH ;
PRICE, A ;
ROBERTS, WL ;
SHAW, TJ ;
SMITH, CA .
ANALYTICAL CHEMISTRY, 1985, 57 (03) :651-658
[4]  
AUWERAER MVD, 1992, THIN SOLID FILMS, V210, P39
[5]   Synthesis and characterization of a trefoil-shaped liquid crystal based on 1,3,5-triazine with carbazole groups [J].
Bai, R ;
Li, S ;
Zou, YF ;
Pan, CY ;
Xie, P ;
Kong, B ;
Zhou, XS ;
Zhang, RB .
LIQUID CRYSTALS, 2001, 28 (12) :1873-1876
[6]   HIGHLY PHOTOCONDUCTIVE DISCOTIC LIQUID-CRYSTALS - STRUCTURE-PROPERTY RELATIONS IN THE HOMOLOGOUS SERIES OF HEXA-ALKOXYTRIPHENYLENES [J].
BENGS, H ;
CLOSS, F ;
FREY, T ;
FUNHOFF, D ;
RINGSDORF, H ;
SIEMENSMEYER, K .
LIQUID CRYSTALS, 1993, 15 (05) :565-574
[7]  
BENGS H, 1993, MAKROMOL CHEM-RAPID, V14, P445
[8]   TRIPHENYLENE-BASED DISCOTIC-LIQUID-CRYSTALLINE POLYMERS - A UNIVERSAL, RATIONAL SYNTHESIS [J].
BODEN, N ;
BUSHBY, RJ ;
CAMMIDGE, AN .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1995, 117 (03) :924-927
[9]   The creation of long-lasting glassy columnar discotic liquid crystals using 'dimeric' discogens [J].
Boden, N ;
Bushby, RJ ;
Cammidge, AN ;
El-Mansoury, A ;
Martin, PS ;
Lu, ZB .
JOURNAL OF MATERIALS CHEMISTRY, 1999, 9 (07) :1391-1402
[10]   Triphenylene-based discotic liquid crystals as self-assembled monolayers [J].
Boden, N ;
Bushby, RJ ;
Martin, PS ;
Evans, SD ;
Owens, RW ;
Smith, DA .
LANGMUIR, 1999, 15 (11) :3790-3797