Ring-Opening Graft Polymerization of Propylene Carbonate onto Xylan in an Ionic LiquidReportar como inadecuado




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1

State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China

2

Institute of New Energy and New Material, Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, South China Agricultural University, Guangzhou 510642, China

3

Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China





*

Author to whom correspondence should be addressed.



Academic Editors: Atsushi Sudo and Takeshi Endo

Abstract The amidine organocatalyst 1,8-diazabicyclo5.4.0undec-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 AmimCl. 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-polypropylene 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

Keywords: xylan; propylene carbonate; DBU; ring-opening graft polymerization; ionic liquid xylan; propylene carbonate; DBU; ring-opening graft polymerization; ionic liquid





Autor: Xueqin Zhang 1, Mingjie Chen 1, Chuanfu Liu 1,* , Aiping Zhang 2 and Runcang Sun 1,3

Fuente: http://mdpi.com/



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