Titelangaben
Hou, Haoqing ; Reuning, Arndt ; Wendorff, Joachim H. ; Greiner, Andreas:
Tuning of the pitch height of thermotropic cellulose esters.
In: Macromolecular Chemistry and Physics.
Bd. 201
(2000)
Heft 15
.
- S. 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
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.
Weitere Angaben
Publikationsform: | Artikel in einer Zeitschrift |
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Begutachteter Beitrag: | Ja |
Keywords: | SUBSTITUTED SEMIFLEXIBLE POLYMERS; PHASE FORMATION; LIQUID; HYDROXYPROPYLCELLULOSE |
Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II > Lehrstuhl Makromolekulare Chemie II - Univ.-Prof. Dr. Andreas Greiner Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II |
Titel an der UBT entstanden: | Nein |
Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
Eingestellt am: | 07 Apr 2015 13:15 |
Letzte Änderung: | 21 Dec 2023 08:55 |
URI: | https://eref.uni-bayreuth.de/id/eprint/9854 |