Liquid crystalline phases, microtwinning in crystals and helical chirality transformations in a main-chain chiral liquid crystalline polyester
文献类型：期刊论文
| 作者 | Li CY ; Jin S ; Weng X ; Ge JJ ; Zhang D ; Bai F ; Harris FW ; Cheng SZD ; Yan DH ; He TB ; Lotz B ; Chien LC |
| 刊名 | macromolecules
 |
| 出版日期 | 2002 |
| 卷号 | 35期号:14页码:5475-5482 |
| 关键词 | SCREW-SENSE INVERSION ACHIRAL MOLECULES LAMELLAR CRYSTALS SYNDIOTACTIC POLYPROPYLENE AMPHIPHILIC ASSEMBLIES SINGLE-CRYSTALS DOUBLE-TWIST MORPHOLOGY POLYMER ORIENTATION |
| ISSN号 | 0024-9297 |
| 通讯作者 | cheng szd |
| 中文摘要 | a main-chain nonracemic chiral liquid crystalline polymer was synthesized from (r)-(-)4'-{w-[2-(p-hydroxy-o-nitrophenyloxy)-1-propyloxy]-1-decyloxyl-4-biphenylcarboxylic acid. this polymer contained 10 methylene units in each chemical repeating unit and was abbreviated pet(r*-10). on the basis of differential scanning calorimetry, wide-angle x-ray diffraction, and polarized light microscopy experiments, chiral smectic c (s-c*) and chiral smectic a (s-a*) phases were identified. both flat-elongated and helical lamellar crystal morphologies were observed in transmission electron microscopy. of particular interest was the flat-elongated lamellar crystals were constructed via microtwinning of an orthorhombic cell with dimensions of a = 1.42 nm, b = 1.28 nm, and c = 3.04 nm. on the other hand, the helical lamellar crystals were exclusively left-handed, which was opposite to the right-handed helical crystals grown in pet(r*-9) and pet(r*-11) (having 9 and 11 methylene units, respectively). note that these three polymers had identical right-handed chiral centers (r*-). therefore, a single methylene unit difference on the polymer backbones on an atomic length scale substantially changed the chirality of the crystals in the micrometer length scale. furthermore, aggregates of these helical crystals in pet(r*-10) did not generate banded spherulites in polarized light microscopy. possible reasons for this change and loss of helical senses (handedness) on different length scales in chirality transferring processes were discussed. |
| 收录类别 | SCI收录期刊论文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000176535600025 |
| 公开日期 | 2010-11-03 |
| 源URL | [http://202.98.16.49/handle/322003/18485]  |
| 专题 | 长春应用化学研究所_长春应用化学研究所知识产出_期刊论文 |
| 推荐引用方式 GB/T 7714 | Li CY,Jin S,Weng X,et al. Liquid crystalline phases, microtwinning in crystals and helical chirality transformations in a main-chain chiral liquid crystalline polyester[J]. macromolecules,2002,35(14):5475-5482. |
| APA | Li CY.,Jin S.,Weng X.,Ge JJ.,Zhang D.,...&Chien LC.(2002).Liquid crystalline phases, microtwinning in crystals and helical chirality transformations in a main-chain chiral liquid crystalline polyester.macromolecules,35(14),5475-5482. |
| MLA | Li CY,et al."Liquid crystalline phases, microtwinning in crystals and helical chirality transformations in a main-chain chiral liquid crystalline polyester".macromolecules 35.14(2002):5475-5482. |
入库方式： OAI收割
来源：长春应用化学研究所
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