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Tuning of the pitch height of thermotropic cellulose esters

Title 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 (October 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

Official URL: Volltext

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: 07 Apr 2015 13:15
URI: https://eref.uni-bayreuth.de/id/eprint/9854