title: Rapid exfoliation of rectorite in quaternized carboxymethyl chitosan.
abstract: Exfoliated quaternized carboxymethyl chitosan/rectorite (QCMC/REC) nanocomposite was prepared via microwave irradiation method for 70 min, which was performed in only water without any additional plasticizer. XRD, TEM, AFM, SEM and FTIR results revealed that when the mass ratio of QCMC to REC was no less than 4:1, the silicate layers of REC were completely exfoliated in QCMC matrix and were homogenous with QCMC, the surface of QCMC/REC nanobiocomposite was very smooth; two types of interactions of hydrogen bond and electrostatic attraction existed in the QCMC/REC nanobiocomposite. Thermal analysis indicated that QCMC/REC nanobiocomposite had higher thermal stability than only QCMC. Therefore, the microwave irradiation method appears to be a promising tool for preparing exfoliated biopolymer/layered silicate nanocomposites at a mild condition.
authors.affiliation: State Key Laboratory of Pulp & Paper Engineering, School of Light Industry and Food, South China University of Technology, Guangzhou 510640, Guangdong, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.forename: Xiaoying
authors.initials: X
authors.lastname: Wang
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: Li
authors.forename: Xianjie
authors.initials: X
authors.lastname: Zeng
authors.forename: Runcang
authors.initials: R
authors.lastname: Sun
authors.forename: John F
authors.initials: JF
authors.lastname: Kennedy
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry* / Q000378:metabolism; D048271:Chitosan / Q000031:analogs & derivatives* / Q000737:chemistry; D006860:Hydrogen Bonding; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008872:Microwaves; D008903:Minerals / Q000737:chemistry* / Q000378:metabolism; D053761:Nanocomposites / Q000737:chemistry* / Q000528:radiation effects; D011108:Polymers / Q000737:chemistry*; D013054:Spectrophotometry, Atomic; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D000538:Aluminum Silicates; D008903:Minerals; D011108:Polymers; C514968:carboxymethyl-chitosan; C546376:rectorite; D048271:Chitosan