Characterization of Xylan-graft-Polycaprolactone Copolymers Prepared in Ionic Liquid

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• 作者：Xueqin Zhang ; Mingjie Chen ; Huihui Wang ; Chuanfu Liu ; Aiping Zhang ; Runcang Sun
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：June 24, 2015
• 年：2015
• 卷：54
• 期：24
• 页码：6282-6290
• 全文大小：484K
• ISSN：1520-5045

文摘

In this study, xylan-graft-polycaprolactone (xylan-g-PCL) with different degrees of substitution (DS) and degrees of polymerization (DP) were prepared by homogeneous ring-opening graft polymerization (ROGP) of 蔚-caprolactone (蔚-CL) onto xylan in ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([Amim]Cl) using 4-dimethylaminopyridine (DMAP) as catalyst. FT-IR, 1D (¹H and ¹³C NMR) and 2D NMR (¹H鈥?sup>13C HSQC and HMBC) spectra provided the evidence of the occurrence of ROGP reaction. ¹H鈥?sup>1H COSY confirmed the correct assignment of the proton signals. HSQC also indicated that 38.78% and 61.22% of PCL side chains were attached to C₂ and C₃ positions of anhydroxylose units, respectively. Xylan-g-PCL copolymers were further characterized by TGA/DTG, SEM, and XRD. The results indicated that the thermal stability of xylan increased upon the DMAP-catalyzed ROGP reaction in [Amim]Cl, and the surface morphologies were significantly changed with increased DS.