• Hasmukh S Patel

      Articles written in Journal of Chemical Sciences

    • Synthesis and characterization of copolymers from 4-halo(chloro, bromo) salicylic acid

      Hasmukh S Patel Shanti R Patel

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      Copolymers have been prepared by condensing a mixture of either 4-chloro or 4-bromosalicylic acid and any one of the comonomer like salicylic acid,p-hydroxybenzoic acid,p-aminosalicylic acid,p-aminobenzoic acid,p-cresol andp-halo(chloro, bromo)phenol with formaldehyde in the presence of 5M H2SO4. Copolymer composition of each of the copolymer has been estimated on the basis of halogen content and/or on the basis of results of non-aqueous titrations of the copolymer against standard sodium methoxide and/or tetra-n-butylammonium hydroxide. The IR spectral characteristics of copolymers have been noted. The viscometric and thermal studies of copolymers have also been carried out.

    • Synthesis, characterization and chelating properties of poly [azo-(6-hydroxy-1,3-phenylene)]

      Hasmukh S Patel Mahesh D Prajapati

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      Poly [azo(6-hydroxy-1,3-phenylene)] (PAHP) was prepared by alcoholic alkaline reduction of 2,4-dinitro phenol (DNP). The polymers prepared at various time intervals were characterized by elemental analyses, IR spectra and thermogravimetric analysis. The number average molecular weight$$(\bar M_n )$$ was determined by non-aqueous titration. Viscometric study in DMF of all the three polymers were carried out and indicates polyelectrolyte behaviour. Viscometric study in DMF-water (85:15)(v/v) containing 1%KBr shows normal behaviour.

      Polymeric metal chelates of Cu2+, Ni2+, Co2+, Zn2+, Mn2+ and Cr2+ with PAHP polymer were prepared and characterized.

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