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International Journal of Polymer Science
Volume 2012 (2012), Article ID 126362, 12 pages
http://dx.doi.org/10.1155/2012/126362
Research Article

Phase Analysis of the Cellulose Triacetate-Nitromethane System

1Institute of Chemistry, Saratov State University, 83 Ulitsa Astrakhanskaya, Saratov 410012, Russia
2Institute of Biochemistry and Physiology of Plants and Microorganisms, 13 Prospect Entuziastov, Saratov 410049, Russia

Received 31 March 2011; Revised 27 May 2011; Accepted 20 August 2011

Academic Editor: Jan-Chan Huang

Copyright © 2012 Anna B. Shipovskaya et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A comprehensive study was made on the cellulose triacetate-nitromethane system to explore its phase separation within ranges 2–25 wt.% and 5 ÷ + 8 0 C by means of polarization light and electron microscopy, the turbidity spectrum method, differential thermal and X-ray analyses, and rheological techniques. The physical state of the polymer was identified within the phase coexistence boundaries on the phase diagram which included three types of phase separation (amorphous (with a UCST at 𝑇 c r = 5 7 C and 𝑐 c r = 7 . 3  wt.%), crystal, and liquid crystal). The boundaries of the regions determining the coexistence of the liquid crystal (LC) and the partly crystal phase were found to be inside the region of amorphous liquid-liquid phase separation. For cellulose ester-solvent systems, this state diagram is the first experimental evidence for the possibility of coexistence of several phases with amorphous, LC, and crystal polymer ordering.