Aspects of the structure of aromatic polyesters with mesogenic groups in the main chain in the bulk state

Волчек, Б. З.; Kholmuradov, N.S.; Purkina, A.V.; Bilibin, A. Yu.; Skorokhodov, S. S.

doi:10.1016/0032-3950(86)90248-0

Cited by 2 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The IR dichroism measurements in LCT-made jet-drawn fibers are commonly performed on the bands corresponding to atomic vibrations localized in aromatic rings (at 1600 cm-') and/or spacer CHI groups (2900 cm-') [3,8]. In our case, both of these bands were inappropriate for orientation studies in view of the presence of aromatic rings involved in differently oriented fragments of the monomer, on the one hand, and due to the lack of CH2 groups in the chain on the other hand.…”

Section: Methods and Equipmentmentioning

confidence: 99%

Orientational ordering in fibers made of wholly aromatic main chain LC polyesters

Savitsky

Горшкова

Kober

1998

Journal of Macromolecular Science, Part B

View full text Add to dashboard Cite

Molecular chain orientation characterized by an order parameter in fibers about lo2 pm in diameter of poly(pheny1-p-phenylene terephthalate) and related copolyesters was investigated by means of infrared attenuated total reflectance (IR ATR) spectroscopy. Samples had a tensile strength of about 1 GPa, which could be increased to 2-3 GPa by a heat treatment under appropriate conditions. It has been found that the chain orientation is parallel to the fiber axis in the surface layer. At a distance of about 10-15 pm from the surface, the orientation decreases, with the most oriented surface layer being easily detachable from the weakly oriented fiber core. The great difference between the molecular orientation in the surface layer and in the fiber bulk was supported by wide-angle x-ray scattering (WAXS) data.

show abstract

Section: Methods and Equipmentmentioning

confidence: 99%