Abstract
Recently, organic catalysis has become a powerful alternative to the use of more traditional metal-based catalysts. In this study, 4-dimethylaminopyridine (DMAP), 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) were applied to mediate the ring-opening graft polymerization (ROGP) of p-dioxanone (PDO) with xylan-based hemicelluloses in ionic liquid 1-butyl-3-methylimidazolium chloride ([Bmim]Cl). Excellent control of the molar ratio of the catalyst to anhydroxylose units (AXU) in xylan was found for a good tuning of the weight percent gain (WPG) of xylan-graft-poly(p-dioxanone) (xylan-g-PPDO) copolymers. As a result, the maximum WPG of xylan-g-PPDO copolymers was 431.07% (DMAP/AXU of 2/1), 316.72% (DBU/AXU of 0.2/1), and 323.15% (TBD/AXU of 0.2/1), respectively. The structure of xylan-g-PPDO copolymers was characterized with FT-IR and NMR. The thermal properties of copolymers were investigated using thermogravimetric analysis (TGA/DTG) and differential scanning calorimetry (DSC), and a significant difference was observed regarding the transition temperature (Tg), melting temperature (Tm), and crystallization temperature (Tc).
Highlights
In recent years, to solve environmental issues and decrease the consumption of fossil resources, the interest in the synthesis of novel materials derived from renewable resources as the replacement of plastic materials has risen spectacularly [1,2]
Hemicelluloses have the inherent drawbacks of a poor processability, poor solubility in most common organic solvents, strong hydrophilicity, and lack of thermoplasticity, limiting their further applications [9,10]
From 13 C-NMR (Figure 1B), the chemical shifts at 63.64, 68.26, 69.16, and 170.16 ppm are ascribed to a, c, b, and d of PPDO, respectively. These results indicated the successful removal of PPDO homopolymers from xylan-g-PPDO copolymers by extraction with acetone
Summary
To solve environmental issues and decrease the consumption of fossil resources, the interest in the synthesis of novel materials derived from renewable resources as the replacement of plastic materials has risen spectacularly [1,2]. Hemicelluloses, the major non-cellulose polysaccharides in wood components, are defined as heterogeneous polymers made up of xylose, mannose, arabinose, glucose, galactose, and sugar acids [3]. Hemicelluloses have the inherent drawbacks of a poor processability, poor solubility in most common organic solvents, strong hydrophilicity, and lack of thermoplasticity, limiting their further applications [9,10]. To compensate for such drawbacks, it is necessary to conduct chemical modifications on the structure of hemicelluloses [9]
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