ISSN:
0959-8103
Keywords:
polyviologen
;
silica
;
sol-gel
;
synthesis
;
thermal analysis
;
liquid crystallinity
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Three ionene viologen polymers were synthesised by the Menshutkin reaction and characterised by chemical and spectroscopic methods. These were incorporated into silica hybrids using the sol-gel method. The transparency of the majority of the products suggested phase separation had not occurred. An attempt to control cracking during drying using a drying control agent appeared to be only partially successful. Polyviologen contents up to as high as 40% by weight could be achieved by a modification of the method involving evaporating a saturated solution of the polymer before incorporating in the sol-gel system. The thermal characteristics of the polymers and the hydrids have been studied using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). TGA of the hybrids showed a three-stage decomposition process due to residual solvent/condensation volatiles and polymer decomposition. DSC showed evidence for liquid crystallinity and high temperature crystallisation in the polymers, but both these effects were masked in the hybrids.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
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