Visibly observed photocrosslinking reaction in indolyl based pendant liquid crystalline polymers: Synthesis and optical property |
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Authors: | Kumarasamy Gayathri Chinnusamy Saravanan Palaninathan Kannan |
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Institution: | Department of Chemistry, Anna University, Chennai 600 025, Tamil Nadu, India |
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Abstract: | Visibly observed photocrosslinkable pendant liquid crystalline polymers containing indolyl based chalcone were synthesized by free‐radical polymerization and characterized spectroscopically. The differential scanning calorimetry and polarized optical microscopy were used to examine liquid crystalline property. The photocrosslinking and luminescence properties were monitored by UV‐Vis spectrophotometer and spectrofluorimeter, respectively. It demonstrates the chalcone unit did not manifest cis ? trans‐isomerization reaction along with 2π+2π photodimerization upon irradiation with UV light like other chalcones hitherto reported. The photocrosslinking was visibly monitored in solution through change of fluorescent color to colorless. The spacer lengths play a key role in the reaction. The fluorescence maximum was blue shifted around 70 nm in chloroform solution upon irradiation with UV light confirms the 2π+2π photodimerization of chalcone unit. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5208–5220, 2009 |
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Keywords: | conjugated polymers fluorescence indolyl based chalcone irradiation liquid crystalline polymers (LCP) optical property photodimerization photoreactive effects resists |
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