Synthesis of Thermoplastic Xylan-Lactide Copolymer with Amidine-Mediated Organocatalyst in Ionic Liquid

Abstract Ring-opening graft polymerization (ROGP) of l-Lactide (l-LA) is a practical method of altering the physical and chemical properties of lignocellulose. Previous studies have mainly investigated cellulose and tin-based catalysts, particularly of tin(II) 2-ethylhexanoate (Sn(oct)2), at high te...

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Autores principales:	Xueqin Zhang, Huihui Wang, Chuanfu Liu, Aiping Zhang, Junli Ren
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2039b9b60f644219b49aef8a923062bd
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spelling	oai:doaj.org-article:2039b9b60f644219b49aef8a923062bd2021-12-02T11:40:14ZSynthesis of Thermoplastic Xylan-Lactide Copolymer with Amidine-Mediated Organocatalyst in Ionic Liquid10.1038/s41598-017-00464-62045-2322https://doaj.org/article/2039b9b60f644219b49aef8a923062bd2017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00464-6https://doaj.org/toc/2045-2322Abstract Ring-opening graft polymerization (ROGP) of l-Lactide (l-LA) is a practical method of altering the physical and chemical properties of lignocellulose. Previous studies have mainly investigated cellulose and tin-based catalysts, particularly of tin(II) 2-ethylhexanoate (Sn(oct)2), at high temperatures and reported low graft efficiencies. In the present study, ROGP of l-LA was successfully achieved on xylan-type hemicelluloses in ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([Amim]Cl) using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as an effective organic catalyst. Mild reaction condition (50 °C) was used to limit transesterification, and thus enhance the graft efficiency. The hydroxyl groups on xylan acted as initiators in the polymerization, and DBU, enhanced the nucleophilicity of the initiator and the propagating chain. Xylan-graft-poly(l-Lactide) (xylan-g-PLA) copolymer with a degree of substitution (DS) of 0.58 and a degree of polymerization (DP) of 5.51 was obtained. In addition, the structures of the xylan-g-PLA copolymers were characterized by GPC, FT-IR and NMR, confirming the success of the ROGP reaction. Thermal analysis revealed that the copolymers exhibited a single glass-transition temperature (T g), which decreased with increasing molar substitution (MS). Thus, modification resulted in the graft copolymers with thermoplastic behavior and tunable T g.Xueqin ZhangHuihui WangChuanfu LiuAiping ZhangJunli RenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xueqin Zhang Huihui Wang Chuanfu Liu Aiping Zhang Junli Ren Synthesis of Thermoplastic Xylan-Lactide Copolymer with Amidine-Mediated Organocatalyst in Ionic Liquid
description	Abstract Ring-opening graft polymerization (ROGP) of l-Lactide (l-LA) is a practical method of altering the physical and chemical properties of lignocellulose. Previous studies have mainly investigated cellulose and tin-based catalysts, particularly of tin(II) 2-ethylhexanoate (Sn(oct)2), at high temperatures and reported low graft efficiencies. In the present study, ROGP of l-LA was successfully achieved on xylan-type hemicelluloses in ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([Amim]Cl) using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as an effective organic catalyst. Mild reaction condition (50 °C) was used to limit transesterification, and thus enhance the graft efficiency. The hydroxyl groups on xylan acted as initiators in the polymerization, and DBU, enhanced the nucleophilicity of the initiator and the propagating chain. Xylan-graft-poly(l-Lactide) (xylan-g-PLA) copolymer with a degree of substitution (DS) of 0.58 and a degree of polymerization (DP) of 5.51 was obtained. In addition, the structures of the xylan-g-PLA copolymers were characterized by GPC, FT-IR and NMR, confirming the success of the ROGP reaction. Thermal analysis revealed that the copolymers exhibited a single glass-transition temperature (T g), which decreased with increasing molar substitution (MS). Thus, modification resulted in the graft copolymers with thermoplastic behavior and tunable T g.
format	article
author	Xueqin Zhang Huihui Wang Chuanfu Liu Aiping Zhang Junli Ren
author_facet	Xueqin Zhang Huihui Wang Chuanfu Liu Aiping Zhang Junli Ren
author_sort	Xueqin Zhang
title	Synthesis of Thermoplastic Xylan-Lactide Copolymer with Amidine-Mediated Organocatalyst in Ionic Liquid
title_short	Synthesis of Thermoplastic Xylan-Lactide Copolymer with Amidine-Mediated Organocatalyst in Ionic Liquid
title_full	Synthesis of Thermoplastic Xylan-Lactide Copolymer with Amidine-Mediated Organocatalyst in Ionic Liquid
title_fullStr	Synthesis of Thermoplastic Xylan-Lactide Copolymer with Amidine-Mediated Organocatalyst in Ionic Liquid
title_full_unstemmed	Synthesis of Thermoplastic Xylan-Lactide Copolymer with Amidine-Mediated Organocatalyst in Ionic Liquid
title_sort	synthesis of thermoplastic xylan-lactide copolymer with amidine-mediated organocatalyst in ionic liquid
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/2039b9b60f644219b49aef8a923062bd
work_keys_str_mv	AT xueqinzhang synthesisofthermoplasticxylanlactidecopolymerwithamidinemediatedorganocatalystinionicliquid AT huihuiwang synthesisofthermoplasticxylanlactidecopolymerwithamidinemediatedorganocatalystinionicliquid AT chuanfuliu synthesisofthermoplasticxylanlactidecopolymerwithamidinemediatedorganocatalystinionicliquid AT aipingzhang synthesisofthermoplasticxylanlactidecopolymerwithamidinemediatedorganocatalystinionicliquid AT junliren synthesisofthermoplasticxylanlactidecopolymerwithamidinemediatedorganocatalystinionicliquid
_version_	1718395628120178688

Synthesis of Thermoplastic Xylan-Lactide Copolymer with Amidine-Mediated Organocatalyst in Ionic Liquid

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