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Title: Synthesis characterisation of photo cross linkable liquid crystalline polymers containing pendant chalcone moiety and their fluorescence lifetime studies
Researcher: Kumar G
Guide(s): Subramanian K
Keywords: Chalcone moieties, polymerization, thermo gravimetric analysis, polymers, photoreactive
Upload Date: 29-Jan-2014
University: Anna University
Completed Date: 
Abstract: This dissertation deals with hitherto unreported newer root of synthesis of photo-cross-linkable polymers containing pendant chalcone moieties with different substituents. The main aim of present research work is to synthesis photo-cross-linkable polymers containing pendant chalcone moiety which exhibits both liquid crystalline and fluorescence life time properties. All the assigned structures of the monomers (M1-M8) were confirmed by 1H-NMR spectra showing resonance signal at 5.8 and 6.2 ppm. All the eight polymers P1-P8 were synthesised by free radical polymerisation method. The thermo gravimetric analysis (TGA) of prepared polymers were measured at a heating rate of 20oC /min and a gas flow rate of 20cm3/min under nitrogen atmosphere in the temperature ranges between 30-800oC in order to investigate the thermal stability. These results indicate that the polymers show good thermal stability, since the phenyl group in the case of polymers P1, P2 and P4 gives better thermal and thermal oxidative stability required for a negative photoresists than the polymers P6 and P7, which contains the same ratios of the photoreactive groups. It is noticed from the above results that the homopolymers decompose at higher temperatures in a single stage and possess good thermal and thermal oxidative stability required for a negative photoresist. Liquid crystalline behaviour of polymers were identified by DSC thermogram and confirmed by hot stage polarized optical microscope images. Five out of eight polymers exhibited mesophase transitions such as nematic by P1, grainy by P3, smectic by P6, nematic by P7 and nematic by P8. Average lifetime values were calculated for polymers P1-P8 in different time intervals of after and before photo-cross-linking. Generally, most cases of polymers showed increased lifetime values after photo-crosslinking due to restriction of rotation and rigid environment of pendant chalcone unit in the polymer backbone. newline newline newline
Pagination: xxxv, 208
Appears in Departments:Faculty of Science and Humanities

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01_title.pdfAttached File51.79 kBAdobe PDFView/Open
02_certificates.pdf154.78 kBAdobe PDFView/Open
03_abstract.pdf29.79 kBAdobe PDFView/Open
04_acknowledgement.pdf18.64 kBAdobe PDFView/Open
05_contents.pdf84.29 kBAdobe PDFView/Open
06_chapter 1.pdf1.38 MBAdobe PDFView/Open
07_chapter 2.pdf1.48 MBAdobe PDFView/Open
08_chapter 3.pdf9.95 MBAdobe PDFView/Open
09_chapter 4.pdf38.71 kBAdobe PDFView/Open
10_references.pdf69.79 kBAdobe PDFView/Open
11_publications.pdf20.77 kBAdobe PDFView/Open
12_vitae.pdf16.77 kBAdobe PDFView/Open

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