Athianna Muthusamy, Krishnasamy Balaji and Salem Chandrasekaran Murugavel Synthesis, thermal, and photocrosslinking studies of thermotropic liquid crystalline poly(benzylidene-ether)esters containing α,β-unsaturated ketone moiety in the main chain Journal of Polymer Science Part A: Polymer Chemistry 51
Poly(benzylidene-ether)esters containing a photoreactive benzylidene chromophore in the main chain were synthesized from 2,6-bis(4-hydroxy-3-methoxybenzylidene) cyclohexanone. The influence of the length of methylene spacer on phase transition was investigated using DSC and an odd-even effect has been observed. The photolysis of liquid crystalline poly(benzylidene-ether)esters revealed that the α,β-unsaturated ketone moiety in the main chain dimerises through 2π + 2π cycloaddition reaction to form a cyclobutane derivative and leads to crosslinking. The rate of photocrosslinking decreases significantly on increasing methylene carbon chain length of the acid spacer.
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