title: Mechanical and barrier properties of guar gum based nano-composite films.
abstract: Guar gum based nano-composite films were prepared using organically modified (cloisite 20A) and unmodified (nanofil 116) nanoclays. Effect of nanoclay incorporation on mechanical strength, water vapor barrier property, chromatic characteristics and opacity of films was evaluated. Nano-composites were characterized using X-ray scattering, FTIR and scanning electron microscopy. A nanoclay concentration dependent increase in mechanical strength and reduction in water vapor transmission rate was observed. Films containing nanofil 116 (2.5% w/w guar gum) and closite 20A (10% w/w guar gum) demonstrated a 102% and 41% higher tensile strength, respectively, as compared to the control. Lower tensile strength of cloisite 20A films as compared to nanofil 116 films was due to its incompatibility with guar gum. X-ray scattering analysis revealed that interstitial spacing between nanofil 116 and cloisite 20A sheets increased due to intercalation by guar gum polymer. This resulted in improved mechanical and barrier properties of nano-composites compared to control.
authors.affiliation: Food Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
authors.forename: Chaturbhuj K
authors.initials: CK
authors.lastname: Saurabh
authors.affiliation: Food Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
authors.forename: Sumit
authors.initials: S
authors.lastname: Gupta
authors.affiliation: Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
authors.forename: Jitendra
authors.initials: J
authors.lastname: Bahadur
authors.affiliation: Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
authors.forename: S
authors.initials: S
authors.lastname: Mazumder
authors.affiliation: Food Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India. Electronic address: pvariyar@barc.gov.in.
authors.forename: Prasad S
authors.initials: PS
authors.lastname: Variyar
authors.affiliation: Food Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
authors.forename: Arun
authors.initials: A
authors.lastname: Sharma
mesh_terms: D005685:Galactans / Q000737:chemistry*; D008351:Mannans / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry*; D053149:Plant Gums / Q000737:chemistry*; D012542:Scattering, Radiation; D017550:Spectroscopy, Fourier Transform Infrared; D013227:Steam; D013718:Tensile Strength; D014961:X-Ray Diffraction
chemical_list: D005685:Galactans; D008351:Mannans; D053149:Plant Gums; D013227:Steam; C007894:guar gum
keywords: Biodegradable film; Guar gum; Irradiation; Nanoclay; X-ray scattering