DocumentCode :
1782954
Title :
Effect of molecular weight of monomer on the processes of phase separation during the elaboration of composite materials type PDLC
Author :
Belaid, Z. Hadjou ; Berrayah, A. ; Abdoune, F.Z. ; Mechernene, L. ; Zair, L. ; Maschke, U.
Author_Institution :
Lab. de Rech. sur les Macromolecules, Univ. Aboubekr Belkaid de Tlemcen, Tlemcen, Algeria
fYear :
2014
fDate :
26-27 Oct. 2014
Firstpage :
1
Lastpage :
4
Abstract :
Polymer Dispersed Liquid Crystals (PDLC) were elaborated by polymerization induced phase separation under ultraviolet (UV). A binary systems use in this study is composed of monomer of different molecular weights (TPGDA, PPGDA540 and PPGDA900), and 70 Wt.% of liquid crystal 5CB. The results showed a rapid decrease of the transmission of the LC droplet formation, followed by an enhancement of the transmission due to a thermal effect generated by exothermic curing, thermal diffusivity between components of the mixture monomers / LC, IR spectrum and high intensity of UV radiation emitted by LC3 lamp. PDLC films prepared exhibit different morphologies depending on the composition of the initial mixture, the UV dose, the molecular weight of the monomer and the nature of a LC. To quantify the effect of the molecular weight of the monomer on the kinetics of phase separation of the reactive mixtures, we realized a theoretical study that has given us a good accord with experiment.
Keywords :
composite materials; curing; molecular weight; phase separation; polymer dispersed liquid crystals; thermal diffusivity; IR spectrum; LC3 lamp; PDLC; UV radiation intensity; composite materials; exothermic curing; molecular weight; polymer dispersed liquid crystals; polymerization induced phase separation; thermal diffusivity; thermal effect; Kinetic theory; Optical films; Polymers; Probes; Radiation effects; Temperature measurement; Liquid crystal; PDLC; phases separation; polymerization; transmission;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Dielectric Materials for Photovoltaic Systems (NAWDMPV), 2014 North African Workshop on
Conference_Location :
Tlemcen
Print_ISBN :
978-1-4799-6502-1
Type :
conf
DOI :
10.1109/NAWDMPV.2014.6997613
Filename :
6997613
Link To Document :
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