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

Molecules

Xueqin Zhang¹  Mingjie Chen¹  Chuanfu Liu¹  Aiping Zhang²  Runcang Sun¹  Atsushi Sudo³ 

[1] State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; E-Mails:;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; E-Mail:State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China;

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

DOI  :  10.3390/molecules20046033

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
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