title: Synthesis and characterization of PEPO grafted carboxymethyl guar and carboxymethyl tamarind as new thermo-associating polymers.
abstract: New thermo associating polymers were designed and synthesized by grafting amino terminated poly(ethylene oxide-co-propylene oxide) (PEPO) onto carboxymethyl guar (CMG) and carboxymethyl tamarind (CMT). The grafting was performed by coupling reaction between NH2 groups of PEPO and COOH groups of CMG and CMT using water-soluble EDC/NHS as coupling agents. The grafting efficiency and the temperature of thermo-association, T(assoc) in the copolymer were studied by NMR spectroscopy. The graft copolymers, CMG-g-PEPO and CMT-g-PEPO exhibited interesting thermo-associating behavior which was evidenced by the detailed rheological and fluorescence measurements. The visco-elastic properties (storage modulus, G'; loss modulus, G") of the copolymer solutions were investigated using oscillatory shear experiments. The influence of salt and surfactant on the T(assoc) was also studied by rheology, where the phenomenon of "Salting out" and "Salting in" was observed for salt and surfactant, respectively, which can give an easy access to tunable properties of these copolymers. These thermo-associating polymers with biodegradable nature of CMG and CMT can have potential applications as smart injectables in controlled release technology and as thickeners in cosmetics and pharmaceutical formulations.
authors.affiliation: Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India.
authors.forename: Nivika R
authors.initials: NR
authors.lastname: Gupta
authors.affiliation: Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India.
authors.forename: Arun
authors.initials: A
authors.lastname: Torris A T
authors.affiliation: Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India.
authors.forename: Prakash P
authors.initials: PP
authors.lastname: Wadgaonkar
authors.affiliation: Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India.
authors.forename: P R
authors.initials: PR
authors.lastname: Rajamohanan
authors.affiliation: ESPCI ParisTech/Sorbonne Universités, UPMC Univ Paris 06/CNRS UMR 7615, SIMM, 10 rue Vauquelin, F-75005 Paris, France.
authors.forename: Guylaine
authors.initials: G
authors.lastname: Ducouret
authors.affiliation: ESPCI ParisTech/Sorbonne Universités, UPMC Univ Paris 06/CNRS UMR 7615, SIMM, 10 rue Vauquelin, F-75005 Paris, France.
authors.forename: Dominique
authors.initials: D
authors.lastname: Hourdet
authors.affiliation: ESPCI ParisTech/Sorbonne Universités, UPMC Univ Paris 06/CNRS UMR 7615, SIMM, 10 rue Vauquelin, F-75005 Paris, France.
authors.forename: Costantino
authors.initials: C
authors.lastname: Creton
authors.affiliation: Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India. Electronic address: mv.badiger@ncl.res.in.
authors.forename: Manohar V
authors.initials: MV
authors.lastname: Badiger
mesh_terms: D004548:Elasticity; D053149:Plant Gums / Q000737:chemistry*; D020442:Poloxamer / Q000031:analogs & derivatives / Q000737:chemistry*; D058105:Polymerization
chemical_list: D053149:Plant Gums; D020442:Poloxamer
keywords: Carboxymethyl guar; Carboxymethyl tamarind; Pluronics; Rheology; Solution behavior; Thermo-associating polymers