Broad-band dielectric spectroscopy on liquid crystalline polymethacrylates with a nitrostilbene mesogene in the side chain

Matthias Pfeiffer; Wolfgang Haase

doi:10.1117/12.22948

1 December 1990 Broad-band dielectric spectroscopy on liquid crystalline polymethacrylates with a nitrostilbene mesogene in the side chain

Matthias Pfeiffer, Wolfgang Haase

Author Affiliations +

Proceedings Volume 1337, Nonlinear Optical Properties of Organic Materials III; (1990) https://doi.org/10.1117/12.22948
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

Using the dielectric spectroscopy in the frequency range I Hz to iO Hz the dielectric response of a suitable characterized (DSC, polarizing microscopy, X-ray diffraction) oriented film of a poly-[4-(4- Methacryloyloxybutoxy)-4'-nitrostilbene] could be detected. The relaxation in parallel alignment is interpreted as a s-process equivalent to the molecular reorientation process around the mesogen's short axis. The perpendicular alignment allows to detect dipole relaxation processes resulting from motions around the mesogen's long axis. A perfect alignment could be obtained in a strong magnetic field of 7 T. Using this method an oligomer with a molar weight of 2900 g/mol showed a completely transparent film of 75 tm thickness. The problems of chemical synthesis as well as a model for a molecular association are discussed.

Citation Download Citation

Matthias Pfeiffer and Wolfgang Haase "Broad-band dielectric spectroscopy on liquid crystalline polymethacrylates with a nitrostilbene mesogene in the side chain", Proc. SPIE 1337, Nonlinear Optical Properties of Organic Materials III, (1 December 1990); https://doi.org/10.1117/12.22948

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available