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具有高机械强度的层状细菌纤维素/聚（N-异丙基丙烯酰胺）复合水凝胶的快速单轴驱动

Rapid uniaxial actuation of layered bacterial cellulose/poly(-isopropylacrylamide) composite hydrogel with high mechanical strength.

作者信息

Wang Qidong, Asoh Taka-Aki, Uyama Hiroshi

机构信息

Department of Applied Chemistry, Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan

出版信息

RSC Adv. 2018 Apr 3;8(23):12608-12613. doi: 10.1039/c8ra01639a.

DOI:10.1039/c8ra01639a
PMID:35541224
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9079606/
Abstract

This study deals with the unique morphology and properties of methylene diphenyl diisocyanate (MDI)-modified bacterial cellulose/poly(-isopropylacrylamide) (BC/PNIPAAm) composite hydrogel prepared by polymerization method. The influence of the molar ratio of MDI/glucose unit of BC on the properties of the resulting hydrogel was investigated. Scanning electron microscopic analysis revealed that after the MDI modification the BC/PNIPAAm hydrogel could preserve the unique layered (known as anisotropic) structure. The mechanical property evaluated by stress-strain test was significantly enhanced when compared to that of neat PNIPAAm hydrogel, due to the presence of the BC matrix as well as the MDI modification. Based on the deswelling behaviors, the BC/PNIPAAm hydrogel exhibited improved and controlled responsive rate when compared with neat PNIPAAm hydrogel. Furthermore, the anisotropic thermo-sensitive property was proved by temperature-responsive test with the fact that the composite hydrogel could only deswell and swell in the axial perpendicular to the layers. Along with desired recyclability, the present composite hydrogel may have an application as artificial muscles.

摘要

本研究探讨了通过聚合方法制备的亚甲基二苯基二异氰酸酯（MDI）改性细菌纤维素/聚（N-异丙基丙烯酰胺）（BC/PNIPAAm）复合水凝胶的独特形态和性能。研究了BC的MDI/葡萄糖单元摩尔比对所得水凝胶性能的影响。扫描电子显微镜分析表明，MDI改性后，BC/PNIPAAm水凝胶能够保留独特的层状（即各向异性）结构。与纯PNIPAAm水凝胶相比，通过应力-应变测试评估的机械性能显著增强，这归因于BC基质的存在以及MDI改性。基于去溶胀行为，与纯PNIPAAm水凝胶相比，BC/PNIPAAm水凝胶表现出改善的和可控的响应速率。此外，通过温度响应测试证明了各向异性热敏性能，即复合水凝胶仅在垂直于层的轴向上发生去溶胀和溶胀。除了具有所需的可回收性外，本复合水凝胶可能具有作为人造肌肉的应用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/3fa262bfe08a/c8ra01639a-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/3b4ca20140e3/c8ra01639a-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/2f6c9f57abd7/c8ra01639a-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/3f22201e8033/c8ra01639a-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/8d85e5afe6ab/c8ra01639a-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/3ddea426f7a6/c8ra01639a-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/3fa262bfe08a/c8ra01639a-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/3b4ca20140e3/c8ra01639a-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/2f6c9f57abd7/c8ra01639a-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/3f22201e8033/c8ra01639a-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/8d85e5afe6ab/c8ra01639a-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/3ddea426f7a6/c8ra01639a-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab4a/9079606/3fa262bfe08a/c8ra01639a-f6.jpg

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