ICCAS OpenIR
Elastic constant anisotropy and disclination interaction in nematic polymers - I. Apparent variation in anisotropy
Song, WH; Fan, XD; Windle, AH; Chen, SX; Qian, RY
2003-07-01
Source PublicationLIQUID CRYSTALS
ISSN0267-8292
Volume30Issue:7Pages:765-774
AbstractThis work presents the effect of elastic anisotropy and disclination interaction on wedge disclinations in the nematic phase of thermotropic polymers, by combining experimental measurements, (this paper part I), with numerical simulation (part II [1]). In part I, the decoration provided by spontaneous banded texture gives much information about the defect structure of polymeric nematics. Working with a semi-rigid polyester, the optical images of + 1/2 disclinations revealed by banding enable the distortion to be determined as a function of polar coordinates from the cores. Continuum theory allows the apparent elastic anisotropy, epsilon(a), of bend and splay constants of the copolyester to be determined from the distortion measurement. The values Of sa, are seen to vary greatly in the range -1 to +1 between different + 1/2 disclinations in the same sample. The statistics of the measurement indicate that the distribution of the values Of epsilon(a) is random. The implication of these observations is that the curvature of wedge disclinations is affected not only by the elastic anisotropy of the material, but also by other factors. The possible reasons are discussed: the interaction of neighbouring disclinations has been numerically analysed to be the predominant factor in [1]. This work also implies that values of the intrinsic elastic anisotropy obtained by measuring the distortion of individual wedge disclinations must be viewed with some circumspection.
DOI10.1080/026782903100011469
Indexed BySCI
Language英语
WOS IDWOS:000183955500002
PublisherTAYLOR & FRANCIS LTD
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/80804
Collection中国科学院化学研究所
Corresponding AuthorWindle, AH
Affiliation1.Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England
2.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Song, WH,Fan, XD,Windle, AH,et al. Elastic constant anisotropy and disclination interaction in nematic polymers - I. Apparent variation in anisotropy[J]. LIQUID CRYSTALS,2003,30(7):765-774.
APA Song, WH,Fan, XD,Windle, AH,Chen, SX,&Qian, RY.(2003).Elastic constant anisotropy and disclination interaction in nematic polymers - I. Apparent variation in anisotropy.LIQUID CRYSTALS,30(7),765-774.
MLA Song, WH,et al."Elastic constant anisotropy and disclination interaction in nematic polymers - I. Apparent variation in anisotropy".LIQUID CRYSTALS 30.7(2003):765-774.
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