Abstract
We have synthesized new liquid crystal polymers containing paramagnetic organometallic structural units. The paramagnetic organometallic units are tetradentate Schiff base complexes of copper (II) containing N,N prime -bis(salicylidene)ethylenediimine. The diamagnetic segments are polyesters containing random sequences of the structural units, dioxyphenyl, pimeloate, and oxybenzoate. Microscopic observations on these polymers reveal the formation of liquid crystalline melts above 136 degree C with fairly uniform molecular alignment. Also, DSC and x-ray measurements indicate a high degree of order in the fluid and relatively high crystallinity in the solid state. Interestingly, we found that in a magnetic field the interaction of the paramagnetic unit partially rotates the director of diamagnetic segments away from their 'usual' alignment parallel to the field. These experiments probe intramolecular cooperativity and also suggest possibilities on the use of molecular paramagnets to control microstructural orientation in materials from liquid crystal polymers.
| Original language | English |
|---|---|
| Title of host publication | Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Material |
| Publisher | ACS |
| Pages | 863 |
| Number of pages | 1 |
| Volume | 56 |
| ISBN (Print) | 0841210519 |
| Publication status | Published - 1987 |
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ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Polymers and Plastics
Cite this
ORGANOMETALLIC LIQUID CRYSTAL POLYMERS : PARAMAGNETIC-DIAMAGNETIC COPOLYMERS. / Stupp, Samuel I; Moore, J. S.
Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Material. Vol. 56 ACS, 1987. p. 863.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - ORGANOMETALLIC LIQUID CRYSTAL POLYMERS
T2 - PARAMAGNETIC-DIAMAGNETIC COPOLYMERS.
AU - Stupp, Samuel I
AU - Moore, J. S.
PY - 1987
Y1 - 1987
N2 - We have synthesized new liquid crystal polymers containing paramagnetic organometallic structural units. The paramagnetic organometallic units are tetradentate Schiff base complexes of copper (II) containing N,N prime -bis(salicylidene)ethylenediimine. The diamagnetic segments are polyesters containing random sequences of the structural units, dioxyphenyl, pimeloate, and oxybenzoate. Microscopic observations on these polymers reveal the formation of liquid crystalline melts above 136 degree C with fairly uniform molecular alignment. Also, DSC and x-ray measurements indicate a high degree of order in the fluid and relatively high crystallinity in the solid state. Interestingly, we found that in a magnetic field the interaction of the paramagnetic unit partially rotates the director of diamagnetic segments away from their 'usual' alignment parallel to the field. These experiments probe intramolecular cooperativity and also suggest possibilities on the use of molecular paramagnets to control microstructural orientation in materials from liquid crystal polymers.
AB - We have synthesized new liquid crystal polymers containing paramagnetic organometallic structural units. The paramagnetic organometallic units are tetradentate Schiff base complexes of copper (II) containing N,N prime -bis(salicylidene)ethylenediimine. The diamagnetic segments are polyesters containing random sequences of the structural units, dioxyphenyl, pimeloate, and oxybenzoate. Microscopic observations on these polymers reveal the formation of liquid crystalline melts above 136 degree C with fairly uniform molecular alignment. Also, DSC and x-ray measurements indicate a high degree of order in the fluid and relatively high crystallinity in the solid state. Interestingly, we found that in a magnetic field the interaction of the paramagnetic unit partially rotates the director of diamagnetic segments away from their 'usual' alignment parallel to the field. These experiments probe intramolecular cooperativity and also suggest possibilities on the use of molecular paramagnets to control microstructural orientation in materials from liquid crystal polymers.
UR - http://www.scopus.com/inward/record.url?scp=0023207693&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0023207693&partnerID=8YFLogxK
M3 - Conference contribution
SN - 0841210519
VL - 56
SP - 863
BT - Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Material
PB - ACS
ER -