Liquid crystalline polymer films of polymers of having azobenzene mesogenic groups in cross linked network structures, process for the preparation thereof, polymers and novel monomers having azobenzene mesogens

Abstract

Novel cross linked polymer films prepared from poly4-[(4-cardanylazo]benzoic acid and poly4-[(4-acryloylcardanylazo]benzoic acid are disclosed. The invention also relates to novel monomers 4-[(4-cardanylazo] benzoic acid and 4-[(4-acryloylcardanylazo] benzoic acid and polymers thereof as well processes for the preparation thereof.

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       7 . A process as claimed in  claim 19 , wherein the diazotisation is effected using sodium nitrate in dilute hydrochloric acid at a temperature in the range of O-5° C.  
   
   
       8 . A process as claimed in  claim 19 , wherein the ratio of p-amino benzoic acid and cardanol used is 1:1.  
   
   
       9 . A process as claimed in  claim 19 , wherein 4-[(4-cardanyl)azo]benzoic acid is converted to its acryloyl derivative 4-[(4-acryloylcardanyl)azo]benzoic acid by reacting the monomer with acryloyl chloride.  
   
   
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       16 . Cationic polymer of formula V  
     
       
         
         
             
             
         
       
     
     of 4-[(4-cardanyl)azo]benzoic acid, said cationic polymer being polymerized through the side chain unsaturation.  
   
   
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       19 . A process for the preparation of 4-[(4-cardanyl)azo]benzoic acid and its acryloyl derivative 4-[(4 acryloylcardanyl)azo]benzoic acid, said process comprising diazotising p-amino benzoic acid to form a diazonium salt solution, adding a solution of cardanol in an organic solvent drop wise to the diazonium salt solution to form a second solution and crystallizing the second solution using an organic solvent to obtain 4-[(4-cardanyl)azo]benzoic acid, and converting some of the 4-[(4-cardanyl)azo]benzoic acid to obtain its acryloyl derivative 4-[(4 acryloylcardanyl)azo]benzoic acid.