钒
材料科学
化学工程
扫描电子显微镜
动态力学分析
聚合物
辐照
共价键
多糖
壳聚糖
化学
复合材料
有机化学
核物理学
冶金
工程类
物理
作者
Carina Haddad,E. A. Kalani D. Edirisinghe,Hope M. Brown,Alexis D. Ostrowski
出处
期刊:ACS applied polymer materials
[American Chemical Society]
日期:2022-01-14
卷期号:4 (2): 859-867
被引量:3
标识
DOI:10.1021/acsapm.1c01371
摘要
Different strategies have been employed to improve the physicochemical and mechanical properties of soft polysaccharide-based materials. Some of these strategies include covalent cross-linking or chemical modification and blending of polymers. In an alternative approach, we used vanadium ion coordination to create dynamic covalent bonds and obtain films with enhanced properties. We prepared bio-based films using pectin and chitosan, two naturally occurring polysaccharides, with glycerol added as a plasticizer to increase the flexibility and elasticity of the material. We incorporated the vanadium ion into the films via soaking in V(V) solutions. Films were characterized through FT-IR to examine the different interactions inside the films. Scanning electron microscopy showed laminated sheets separated by ∼0.16 μm in the V(V)-containing films as compared to ∼0.75 μm in the films without V(V). Rheological studies showed that V(V)-coordinated films possessed better mechanical properties (higher storage modulus) and water stability than films without vanadium. Upon irradiation with blue light, diffuse reflectance spectroscopy and color analysis showed the changes in the color of the film with irradiation from yellow to blue, consistent with the photochemical reduction of V(V) to V(IV). A small change in modulus was observed during light irradiation without significant structural changes observed within the film in scanning electron microscopy. These results show that it is possible to create robust and water-stable polysaccharide-based materials through coordination of the functional groups of polysaccharides with metal ions.
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