title: Biocomposites with tunable properties from poly(lactic acid)-based copolymers and carboxymethyl cellulose via ionic assembly.
abstract: Biocomposites with tunable properties were successfully prepared through ionic assembly between anionic carboxymethyl cellulose (CMC) and cationic copolymers (quaternized poly(l-lactide)-block-poly N,N-dimethylamino-2-ethyl methacrylate) (PLA-b-PDMAEMA). The quaternized PDMAEMA segment not only works as a compatibilizer between hydrophilic CMC and hydrophobic PLA, but also acts as a lubricant between these two rigid biopolymers. The (1)H NMR (nuclear magnetic resonance) spectra demonstrated successful synthesis of PLA-b-PDMAEMA with controlled molecular weight of PDMAEMA segment. The results from scanning electronic microscopy (SEM) and Fourier transform infrared spectrometry (FTIR) verified the interaction between quaternized copolymer micelles and anionic CMC networks. The resultant biocomposite could form a transparent and uniform film after casting. Both storage moduli and maximum degradation temperature of PLA/CMC composites were increased with the reduction of molecular weight of PDMAEMA segments. It suggests that the properties of biocomposite materials can be tailored by adjusting the chain length of inclusive PDMAEMA segment.
authors.affiliation: Department of Agricultural & Biological Engineering, University of Florida, PO Box 110570, Gainesville, FL 32611-0570, USA. Electronic address: n.chen@ufl.edu.
authors.forename: Nusheng
authors.initials: N
authors.lastname: Chen
authors.affiliation: Department of Agricultural & Biological Engineering, University of Florida, PO Box 110570, Gainesville, FL 32611-0570, USA. Electronic address: ztong@ufl.edu.
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Tong
authors.affiliation: Department of Food Science & Human Nutrition, University of Florida, PO Box 110370, Gainesville, FL 32611-0370, USA. Electronic address: wade.yang@ufl.edu.
authors.forename: Weihua
authors.initials: W
authors.lastname: Yang
authors.affiliation: Department of Material Science & Engineering, University of Florida, PO Box 116400, Gainesville, FL 32611-6400, USA. Electronic address: abrennan@mse.ufl.edu.
authors.forename: Anthony B
authors.initials: AB
authors.lastname: Brennan
mesh_terms: D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008689:Methacrylates / Q000737:chemistry*; D008823:Micelles; D008855:Microscopy, Electron, Scanning; D011091:Polyesters / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry
chemical_list: D008689:Methacrylates; D008823:Micelles; D011091:Polyesters; C542831:poly(lactide)-b-poly(N,N-dimethylamino-2-ethyl methacrylate); D002266:Carboxymethylcellulose Sodium
keywords: 2-(Dimethylamino) ethyl methacrylate (PubChem CID: 17869); Biocomposite; Carboxymethyl cellulose; Carboxymethylcellulose sodium (PubChem CID: 6328154); Ionic self-assembly; Lactide (PubChem CID: 7272); Polylactic acid; Tunable property