at Google ScholarTitle data
Hou, Haoqing ; Reuning, Arndt ; Wendorff, Joachim H. ; Greiner, Andreas:
Tuning of the pitch height of thermotropic cellulose esters.
In: Macromolecular Chemistry and Physics.
Vol. 201
(2000)
Issue 15
.
- pp. 2050-2054.
ISSN 1521-3935
DOI: https://doi.org/10.1002/1521-3935(20001001)201:15<2050::AID-MACP2050>3.0.CO;2-I
Abstract in another language
Butyric esters of (2-hydroxypropyl) cellulose (BuPC) with different degree of substitution(DS) were synthesized via control of the esterification time of butyryl chloride and (2-hydroxypropyl) cellulose. These BuPCs are thermotropic and displayed different colors at ambient temperature due to the formation of a cholesteric structure and the occurrence of a corresponding cholesteric reflection. The pitch height was found to increase significantly with a decrease of the degree of substitution. Both the glass transition temperature and the melting temperature are not affected by variation of the DS. The BuPC samples displayed a banded texture or focal-conic texture, respectively. The X-ray diffraction studies revealed the presence of a layer structure. The cl-spacing between two adjacent layers in the cholesteric structure displayed no significant dependence on the DS in the range from 2 to 3.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Keywords: | SUBSTITUTED SEMIFLEXIBLE POLYMERS; PHASE FORMATION; LIQUID; HYDROXYPROPYLCELLULOSE |
| Institutions of the University: | Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II |
| Result of work at the UBT: | No |
| DDC Subjects: | 500 Science > 540 Chemistry |
| Date Deposited: | 07 Apr 2015 13:15 |
| Last Modified: | 21 Dec 2023 08:55 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/9854 |