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Molecules 2015, 20(4), 6033-6047; doi:10.3390/molecules20046033

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
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)
View Full-Text   |   Download PDF [2210 KB, uploaded 7 April 2015]   |  

Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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.

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