ICCAS OpenIR
Direct observation of director fields of disclinations in the nematic mesophase of a main chain thermotropic aromatic polyester by surface microcrack decoration
Hu, ZM; Chen, SX; Qian, RY
2001-03-01
Source PublicationLIQUID CRYSTALS
ISSN0267-8292
Volume28Issue:3Pages:451-455
AbstractFor a main chain thermotropic aromatic polyester with a flexible spacer, Cr 194 N 245 I (degreesC), the director fields around disclinations in the nematic mesophase can be decorated by both the solidification-induced band texture and surface microcracks. Director fields of various types of disclinations, including inversion walls, in the nematic mesophase of this semi-rigid polyester have been observed directly by polarizing optical microscopy. It was found that when the polymer was pre-sheared in the nematic state and then quenched to room temperature, a shear-induced band texture was observed, which relaxed slowly during annealing at 200 degreesC, and then on quenching the solidification-induced band texture and surface microcracks appeared, displaying the pattern of the disclination fields. Pre-shearing is a necessary condition for the appearance of microcracks. On annealing, disclinations of various types were generated, quite often connected by inversion walls in the direction of pre-shearing. In some areas of the specimen where the shear-induced bands had not been completely relaxed during annealing, the shear-induced band texture was shown by the birefringence and surface microcracks to have a supermolecular structure of sinusoidal chain fibrils.
Indexed BySCI
Language英语
WOS IDWOS:000167362700015
PublisherTAYLOR & FRANCIS LTD
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/78050
Collection中国科学院化学研究所
Corresponding AuthorChen, SX
AffiliationChinese Acad Sci, Inst Chem, Ctr Mol Sci, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Hu, ZM,Chen, SX,Qian, RY. Direct observation of director fields of disclinations in the nematic mesophase of a main chain thermotropic aromatic polyester by surface microcrack decoration[J]. LIQUID CRYSTALS,2001,28(3):451-455.
APA Hu, ZM,Chen, SX,&Qian, RY.(2001).Direct observation of director fields of disclinations in the nematic mesophase of a main chain thermotropic aromatic polyester by surface microcrack decoration.LIQUID CRYSTALS,28(3),451-455.
MLA Hu, ZM,et al."Direct observation of director fields of disclinations in the nematic mesophase of a main chain thermotropic aromatic polyester by surface microcrack decoration".LIQUID CRYSTALS 28.3(2001):451-455.
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