DOI: 10.1002/macp.1986.021871121. Deuteron NMR study of molecular order and motion of the mesogenic side groups in liquid‐crystalline polymers

Deuteron NMR study of molecular order and motion of the mesogenic side groups in liquid‐crystalline polymers

10.1002/macp.1986.021871121

Crossref journal-article

Wiley

Die Makromolekulare Chemie (311)

Abstract

AbstractThe molecular order and mobility of two liquid‐crystalline polyacrylates with phenyl benzoate moieties as mesogenic side groups and (CH2)m spacers (m = 2 and m = 6) were investigated by pulsed 2H NMR. The mesogenic side groups were isotopically labelled at the terminal phenylene ring. In the glassy state the orientational distribution function was characterized from the angular dependence of the 2H NMR line shape of samples macroscopically ordered in their nematic phase by the 8,4 T magnetic field of an NMR spectrometer. It was found to be Gaussian with widths of ± 18,5° and ± 10,5° for the m = 2 frozen nematic and m = 6 frozen smectic system, respectively. The phenylene rings undergo 180° jumps about their local C2‐axes in the glassy state. The time‐scale of this process, however, was found not to be uniform. Instead, the analysis of 2H NMR line shapes and their intensities as a function of temperature yielded a log‐Gaussian distribution with correlation times characteristic of amorphous solids, 2,2 versus 2,5 decades in width and mean activation energy ĒA = 42 versus 47 kJ/mol for the m = 2 and m = 6 system, respectively. The correlation times for the centre of the distribution agree with those obtained by dielectric relaxation measurements of the same systems, suggesting that reorientation of the whole mesogenic group is detected via the phenylene rings.

Bibliography

Pschorn, U., Spiess, H. W., Hisgen, B., & Ringsdorf, H. (1986). Deuteron NMR study of molecular order and motion of the mesogenic side groups in liquidâcrystalline polymers. Die Makromolekulare Chemie, 187(11), 2711â2723. Portico.

Authors 4

Uwe Pschorn (first)
Hans Wolfgang Spiess (additional)
Bernd Hisgen (additional)
Helmut Ringsdorf (additional)

References 34 Referenced 40

Liquid Crystal Polymers edited byM.GordonandN. A.Platé Adv. Polym. Sci.59–61 (1984)
10.1007/978-94-009-4934-8_21
10.1002/macp.1978.021790129
10.1002/pol.1979.170170609
{'key': 'e_1_2_1_5_2', 'volume-title': 'Developments in Oriented Polymers‐1', 'author': 'Spiess H. W.', 'year': '1982'} / Developments in Oriented Polymers‐1 by Spiess H. W. (1982)
10.1007/BF01469664
{'key': 'e_1_2_1_7_2', 'first-page': '23', 'volume-title': 'Deuteron NMR — A new Tool for Studying Chain Mobility and Orientation in Polymers', 'author': 'Spiess H. W.', 'year': '1985'} / Deuteron NMR — A new Tool for Studying Chain Mobility and Orientation in Polymers by Spiess H. W. (1985)
{'key': 'e_1_2_1_8_2', 'first-page': '211', 'volume-title': 'Progress in N.M.R. Spectroscopy', 'author': 'Müller K.', 'year': '1985'} / Progress in N.M.R. Spectroscopy by Müller K. (1985)
10.1021/ja00367a073
10.1002/ijch.198300055
10.1002/macp.1984.021851217
10.1021/ja00292a011
10.1021/ma00147a026
Ch.Boeffel H. W.Spiess B.Hisgen H.Ringsdorf H.Ohm R.Kirste to be published
10.1021/bk-1978-0074.ch003
10.1063/1.1696081
M.Portugall Ph. D. Thesis University of Mainz 1981
B.Hisgen Ph. D. Thesis University of Mainz 1984
10.1016/0022-2364(79)90086-6
10.1007/978-94-010-2355-9
10.1351/pac198557111617
{'key': 'e_1_2_1_22_2', 'volume-title': 'The Principles of Nuclear Magnetism', 'author': 'Abragam A.', 'year': '1969'} / The Principles of Nuclear Magnetism by Abragam A. (1969)
{'key': 'e_1_2_1_23_2', 'first-page': '381', 'volume': '42', 'author': 'Spiess H. W.', 'year': '1980', 'journal-title': 'J. Magn. Reson.'} / J. Magn. Reson. by Spiess H. W. (1980)
{'key': 'e_1_2_1_24_2', 'volume-title': 'The Molecular Physics of Liquid Crystals', 'author': 'Luckhurst G. R.', 'year': '1979'} / The Molecular Physics of Liquid Crystals by Luckhurst G. R. (1979)
10.1039/tf9706600080
10.1063/1.440530
10.1016/0370-1573(80)90048-4
{'key': 'e_1_2_1_28_2', 'first-page': '124', 'volume': '48', 'author': 'Patterson G. D.', 'year': '1983', 'journal-title': 'Adv. Polym. Sci.'} / Adv. Polym. Sci. by Patterson G. D. (1983)
10.1007/BFb0114017
10.1002/marc.1985.030060312
U.Pschorn Ph. D. Thesis University of Mainz 1985
10.1002/macp.1985.020121985117
10.1063/1.1682172
R.Zentel Ph. D. Thesis University of Mainz 1983

Dates

Type	When
Created	22 years, 4 months ago (April 16, 2003, 6:24 a.m.)
Deposited	1 year, 10 months ago (Oct. 22, 2023, 3:13 p.m.)
Indexed	1 year, 10 months ago (Oct. 27, 2023, 4:20 a.m.)
Issued	38 years, 10 months ago (Nov. 1, 1986)
Published	38 years, 10 months ago (Nov. 1, 1986)
Published Online	22 years, 5 months ago (March 12, 2003)
Published Print	38 years, 10 months ago (Nov. 1, 1986)

Funders 0

None

BibTeX

@article{Pschorn_1986, title={Deuteron NMR study of molecular order and motion of the mesogenic side groups in liquid‐crystalline polymers}, volume={187}, ISSN={0025-116X}, url={http://dx.doi.org/10.1002/macp.1986.021871121}, DOI={10.1002/macp.1986.021871121}, number={11}, journal={Die Makromolekulare Chemie}, publisher={Wiley}, author={Pschorn, Uwe and Spiess, Hans Wolfgang and Hisgen, Bernd and Ringsdorf, Helmut}, year={1986}, month=nov, pages={2711–2723} }

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