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通过互穿聚合物网络策略制备具有可切换亲水性和疏水性的热敏木质纤维素水凝胶。

Fabrication of thermo-sensitive lignocellulose hydrogels with switchable hydrophilicity and hydrophobicity through an SIPN strategy.

作者信息

Xia Jianyu, Liu Zhulan, Chen Yan, Wang Zhiguo, Cao Yunfeng

机构信息

Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Jiangsu Co-innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University 159 Longpan Rd Nanjing 210037 China

出版信息

RSC Adv. 2019 Sep 18;9(51):29600-29608. doi: 10.1039/c9ra05575d.

DOI:10.1039/c9ra05575d
PMID:35531504
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9072013/
Abstract

Herein, thermo-sensitive lignocellulose hydrogels with varying lignin contents were fabricated with -isopropylacrylamide (NIPAAm) by a semi-interpenetrating polymer network (SIPN) strategy using a LiCl/DMSO solvent system. Soda lignin mixed with the lignocellulose/LiCl/DMSO solution was also used to prepare the composite hydrogels, and the influence of the existential state of lignin on the hydrogel properties was analyzed objectively. The SIPN hydrogels exhibited more favorable mechanical properties due to the physical entanglement of poly-NIPAAm and lignocellulose. The presence of externally added lignin in the composite hydrogels is beneficial for mechanical improvement. Both the mechanical properties and the morphologies of the SIPN hydrogels can be tuned by varying the existential state and content of lignin. Furthermore, the prepared SIPN hydrogels showed rapid conversion from being hydrophilic at 20 °C to being hydrophobic at 45 °C. All SIPN hydrogels exhibited obvious oil absorbency in an oil/water mixture at 45 °C. Moreover, the different lignin existential states in the hydrogels resulted in different lower critical solution temperatures (LCST). This study provides a feasible route to produce reinforced thermo-sensitive hydrogels and develops a method for tailoring the morphology and the absorption properties of hydrogels by controlling the existential state and content of lignin.

摘要

在此，采用半互穿聚合物网络（SIPN）策略，使用LiCl/DMSO溶剂体系，用N-异丙基丙烯酰胺（NIPAAm）制备了具有不同木质素含量的热敏性木质纤维素水凝胶。将苏打木质素与木质纤维素/LiCl/DMSO溶液混合，也用于制备复合水凝胶，并客观分析了木质素的存在状态对水凝胶性能的影响。由于聚NIPAAm与木质纤维素的物理缠结，SIPN水凝胶表现出更优异的力学性能。复合水凝胶中添加的木质素有利于力学性能的改善。通过改变木质素的存在状态和含量，可以调节SIPN水凝胶的力学性能和形态。此外，制备的SIPN水凝胶在20℃时从亲水性迅速转变为45℃时的疏水性。所有SIPN水凝胶在45℃的油/水混合物中均表现出明显的吸油性。此外，水凝胶中不同的木质素存在状态导致了不同的最低临界溶液温度（LCST）。本研究为制备增强型热敏水凝胶提供了一条可行的途径，并开发了一种通过控制木质素的存在状态和含量来调整水凝胶形态和吸收性能的方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/0f2602cf2f93/c9ra05575d-f10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/117fa40dbb14/c9ra05575d-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/5f2561d695c1/c9ra05575d-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/d244f49cfe2f/c9ra05575d-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/b86f6f192d5b/c9ra05575d-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/043dcffd61bc/c9ra05575d-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/cb8651efa477/c9ra05575d-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/213ee7a74b9e/c9ra05575d-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/7f6c5329eb15/c9ra05575d-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/1fccdb9d3cd7/c9ra05575d-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/0f2602cf2f93/c9ra05575d-f10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/117fa40dbb14/c9ra05575d-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/5f2561d695c1/c9ra05575d-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/d244f49cfe2f/c9ra05575d-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/b86f6f192d5b/c9ra05575d-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/043dcffd61bc/c9ra05575d-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/cb8651efa477/c9ra05575d-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/213ee7a74b9e/c9ra05575d-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/7f6c5329eb15/c9ra05575d-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/1fccdb9d3cd7/c9ra05575d-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1ba/9072013/0f2602cf2f93/c9ra05575d-f10.jpg

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