Dynamic mechanical and thermal behavior of liquid-crystalline polybutadiene-diols with mesogenic groups in side chains

被引：0
|
作者：
Jigounov, Alexander [1 ]
Sedláková, Zdeňka [2 ]
Spěváček, Jiří [2 ]
Ilavský, Michal [1 ,2 ]
机构：
[1] Faculty of Mathematics and Physics, Charles University, V Holesovickach 2, 18000 Prague 8, Czech Republic
[2] Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 16206 Prague 6, Czech Republic
来源：
European Polymer Journal | 2006年 / 42卷 / 10期
关键词：
Liquid-crystalline polybutadiene-diols (LCPBDs) with the comb-like architecture were synthesized by reaction of a LC thiol with the double bonds of telechelic HO-terminated polybutadiene (PBD). LCPBDs with various initial molar ratios of thiol to double bonds of PBD; R0; in the range from 0.15 to 1; were prepared by the radical reaction at temperature 60 °C for 48 h. The experimentally obtained degree of modification; Re; after the reaction and purification; was determined from elemental analysis - from the amount of sulphur bounded in LCPBDs; GPC and from 1H NMR spectra. The physical properties were investigated by differential scanning calorimetry and dynamic mechanical spectroscopy. With increasing Re ratio the glass transition temperature of LCPBDs; Tg; increases from ∼ - 45 °C (neat PBD) to ∼20 °C (Re ∼ 0.5). LC transition starts at Re ∼ 0.27 (the transition temperature Tm ∼ 27 °C). With increasing Re temperature Tm increases and for Re ∼ 0.5 reaches the value Tm ∼ 74 °C; at the same time also the change in enthalpy at LC transition increases. The LC transition could be detected also by the dynamic mechanical spectroscopy; especially shape and position of mechanical functions on frequency and free volume parameters strongly depend on degree of modification. © 2006 Elsevier Ltd. All rights reserved;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Journal article (JA)
引用
收藏
页码：2450 / 2457
相关论文
共 50 条
  • [1] Dynamic mechanical and thermal behavior of liquid-crystalline polybutadiene-diols with mesogenic groups in side chains
    Jigounov, Alexander
    Sedlakova, Zdenka
    Spevacek, Jiri
    Ilavsky, Michal
    EUROPEAN POLYMER JOURNAL, 2006, 42 (10) : 2450 - 2457
  • [2] Thermal and dielectric behaviour of liquid-crystalline polybutadiene-diols with mesogenic groups in side chains
    Ilavsky, Michal
    Nedbal, Jan
    Polakova, Lenka
    Sedlakova, Zdenka
    COMPLEX SYSTEMS-BOOK 1, 2008, 982 : 440 - +
  • [3] Dynamic mechanical and thermal behavior of novel liquid-crystalline polybutadiene-diols with azobenzene groups in side chains
    Polakova, Lenka
    Sedlakova, Zdenka
    Benes, Hynek
    Valentova, Helena
    Krakovsky, Ivan
    Rabie, Feras
    JOURNAL OF RHEOLOGY, 2013, 57 (05) : 1297 - 1310
  • [4] Thermal, mechanical and dielectric behaviour of liquid-crystalline polybutadiene-diols with cyanobiphenyl groups in side chains
    Nedbal, Jan
    Jigounov, Alexander
    Sedlakova, Zdenka
    Ilavsky, Michal
    COMPLEX SYSTEMS-BOOK 1, 2008, 982 : 470 - +
  • [5] Dielectric and thermal behavior of liquid crystalline comb-like polybutadiene-diols with mesogenic groups in side chains
    Jigounov, A.
    Sedlakova, Z.
    Kripotou, R.
    Pissis, P.
    Nedbal, J.
    Baldrian, J.
    Ilavsky, M.
    POLYMER, 2007, 48 (19) : 5721 - 5733
  • [6] Thermal, dynamic mechanical and dielectric behavior of liquid-crystalline linear and crosslinked polyurethanes with mesogenic group in side chains
    Ilavsky, M.
    Valentova, H.
    Sedlakova, Z.
    Nedbal, J.
    Velychko, V.
    RECENT DEVELOPMENTS IN ADVANCED MATERIALS AND PROCESSES, 2006, 518 : 367 - 374
  • [7] Thermal properties of liquid-crystalline diols and corresponding bis-urethanes with mesogenic groups of various structures in side chains
    Kašpar, M.
    Hamplová, V.
    Novotná, V.
    Studenovský, M.
    Ilavský, M.
    Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, 2002, 392 : 17 - 30
  • [8] Thermal properties of liquid-crystalline diols and corresponding bis-urethanes with mesogenic groups of various structures in side chains
    Kaspar, M
    Hamplová, V
    Novotná, V
    Studenovsky, M
    Ilavsky, M
    MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 2002, 392 : 17 - 30
  • [9] THERMAL EFFECTS ON LIQUID-CRYSTALLINE ORDER IN POLYMERS WITH MESOGENIC SIDE GROUPS
    SHILOV, VV
    TSUKRUK, VV
    LIPATOV, YS
    JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1984, 22 (01) : 41 - 47
  • [10] THERMOTROPIC LIQUID-CRYSTALLINE POLYMERS WITH MESOGENIC SIDE GROUPS
    SHIBAEV, VP
    PLATE, NA
    ADVANCES IN POLYMER SCIENCE, 1984, 60-1 : 173 - 260
12345