Shear-induced band texture of side group liquid crystalline polymers
Hu, ZM; Chen, SX; Zhang, SF; Qian, RY
Source PublicationLIQUID CRYSTALS
AbstractThe shear-induced band texture of conventional end-on fixed side group liquid crystalline polymers (LCPs) has been investigated by using polarizing optical microscopy (POM), small angle light scattering (SALS) and infra-red dichroism techniques. The band spacing is about 1 mum. which increases very slightly on increasing the temperature of shearing and is independent of shearing rate within the range studied. The band texture is not seen to exhibit an interchange of dark and bright bands on rotation of the sample with respect to the polarizer/analyser. but a typical periodical structure is reflected by the SALS patterns of the band texture. The relaxation behaviour of the bands indicates that the band texture formed here is the result of the orderly aligning of domains exhibiting the focal-conic texture, and this is totally different from the case of main chain LCPs where the band texture is substantially an optical effect of the periodic zigzag or sinusoidal structure of parallel aligned microfibrils. Infra-red dichroism and rotating parallel-plate shearing measurements show that the axes of the backbone of the polymer tend to orient in the shearing direction and the end-on fixed mesogenic side groups tend to align perpendicular to the shearing direction.
Indexed BySCI
WOS IDWOS:000167952600003
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Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
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,Zhang, SF,et al. Shear-induced band texture of side group liquid crystalline polymers[J]. LIQUID CRYSTALS,2001,28(4):503-509.
APA Hu, ZM,Chen, SX,Zhang, SF,&Qian, RY.(2001).Shear-induced band texture of side group liquid crystalline polymers.LIQUID CRYSTALS,28(4),503-509.
MLA Hu, ZM,et al."Shear-induced band texture of side group liquid crystalline polymers".LIQUID CRYSTALS 28.4(2001):503-509.
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