综述了液晶分子在与聚合物嵌段、碳纳米管（CNT）和多面低聚倍半硅氧烷（POSS）等通过共价键形成的化学受限环境下的液晶相行为。聚合物嵌段微区的受限作用使侧链液晶嵌段共聚物的液晶有序度减小,相变温度降低。由于碳纳米管的受限作用,液晶聚合物接枝CNTs的有序结构被破坏,液晶性丧失。POSS以共价键的方式引入到液晶分子中,明显提高了液晶相的稳定性。但是当POSS含量高于某临界值后使液晶分子表现出单向性液晶相行为,甚至使其丧失液晶性。
The review summarized the researching progress on phase behaviors of LCs under chemical confinements such as polymer blocks,carbon nanotubes（CNTs） and polyhedral oligomeric silsesquioxanes（POSS） which are covalently linked with LCs.The researching results showed that the confinements of polymer blocks decrease the order degree and phases transition temperature of liquid crystalline phases in the blocking copolymers.For liquid crystalline polymer grafted CNTs,the confinements of CNTs destroy the LC ordering,and there exists no liquid crystalline phase in them.The incorporation of POSS in LCs via covalent bonds enhance the thermal stability of LC phases.However,as the content of POSS is higher the critical value,the LC molecules exhibit the monotropic liquid crystallinity,and their liquid crystallinity disappears.
参考文献
| [1] | Cui L.;Zhao Y.;Yavrian A.;Galstian T. .Synthesis of azobenzene-containing diblock copolymers using atom transfer radical polymerization and the photoalignment behavior[J].Macromolecules,2003(22):8246-8252. |
| [2] | Deng W;Albouy PA;Lacaze E;Keller P;Wang XG;Li MH .Azobenzene-containing liquid crystal triblock copolymers: Synthesis, characterization, and self-assembly behavior[J].Macromolecules,2008(7):2459-2466. |
| [3] | Zhukov S.;Geppert S.;Stuhn B.;Staneva R.;Ivanova R.;Gronski W. .Dielectric relaxation in liquid crystalline/isotropic block copolymers: Effect of nanoscale confinement on the segmental dynamics[J].Macromolecules,2002(22):8521-8530. |
| [4] | Jang J.;Bae J.;Yoon SH. .A study on the effect of surface treatment of carbon nanotubes for liquid crystalline epoxide-carbon nanotube composites[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2003(4):676-681. |
| [5] | 潘其维,范星河,陈小芳,周其凤.六面体倍半硅氧烷（POSS）杂化材料[J].化学进展,2006(05):616-621. |
| [6] | Ni, Y;Zheng, SX .A novel photocrosslinkable polyhedral oligomeric silsesquioxane and its nanocomposites with poly(vinyl cinnamate)[J].Chemistry of Materials,2004(24):5141-5148. |
| [7] | Wang, X.-T.;Yang, Y.-K.;Yang, Z.-F.;Zhou, X.-P.;Liao, Y.-G.;Lv, C.-C.;Chang, F.-C.;Xie, X.-L. .Thermal properties and liquid crystallinity of side-chain azobenzene copolymer containing pendant polyhedral oligomeric silsequioxanes[J].Journal of thermal analysis and calorimetry,2010(2):739-744. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%