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Open AccessArticle

Ring-Opening Graft Polymerization of Propylene Carbonate onto Xylan in an Ionic Liquid

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
Molecules 2015, 20(4), 6033-6047; https://doi.org/10.3390/molecules20046033
Received: 27 February 2015 / Revised: 25 March 2015 / Accepted: 2 April 2015 / Published: 7 April 2015
(This article belongs to the Special Issue Ring-Opening Polymerization)
The 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
Keywords: xylan; propylene carbonate; DBU; ring-opening graft polymerization; ionic liquid xylan; propylene carbonate; DBU; ring-opening graft polymerization; ionic liquid
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MDPI and ACS Style

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.

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