Ring-Opening Graft Polymerization of Propylene Carbonate onto Xylan in an Ionic Liquid
AbstractThe amidine organocatalyst 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) is an effective nucleophilic catalyst. Biocomposites with tuneable properties were successfully synthesized by ring-opening graft polymerization (ROGP) of propylene carbonate (PC) onto xylan using DBU as a catalyst in the ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([Amim]Cl). The effects of reaction temperature, reaction time and the molar ratio of PC to anhydroxylose units (AXU) in xylan were investigated. The physico-chemical properties of xylan-graft-poly(propylene carbonate) (xylan-g-PPC) copolymers were characterised by FT-IR, NMR, TGA/DTG, AFM and tensile analysis. The FT-IR and NMR results indicated the successful attachment of PPC onto xylan. TGA/DTG suggested the increased thermal stability of xylan after the attachment of PPC side chains. AFM analysis revealed details about the molecular aggregation of xylan-g-PPC films. The results also showed that with the increased DS of xylan-g-PPC copolymers, the tensile strength and Young’s modulus of the films decreased, while the elongation at break increased. View Full-Text
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Zhang, X.; Chen, M.; Liu, C.; Zhang, A.; Sun, R. Ring-Opening Graft Polymerization of Propylene Carbonate onto Xylan in an Ionic Liquid. Molecules 2015, 20, 6033-6047.
Zhang X, Chen M, Liu C, Zhang A, Sun R. Ring-Opening Graft Polymerization of Propylene Carbonate onto Xylan in an Ionic Liquid. Molecules. 2015; 20(4):6033-6047.Chicago/Turabian Style
Zhang, Xueqin; Chen, Mingjie; Liu, Chuanfu; Zhang, Aiping; Sun, Runcang. 2015. "Ring-Opening Graft Polymerization of Propylene Carbonate onto Xylan in an Ionic Liquid." Molecules 20, no. 4: 6033-6047.