Photoreactivity and Enhanced Mechanical Properties and Water Stability in Polysaccharide-Based Films Using Vanadium Ion Coordination
Photoreactivity and Enhanced Mechanical Properties and Water Stability in Polysaccharide-Based Films Using Vanadium Ion Coordination
复制标题
DOI：
10.1021/acsapm.1c01371
复制
发表时间：
2022-01
影响因子：
5
通讯作者：
Carina Haddad;E. Edirisinghe;Hope M. Brown;Alexis D. Ostrowski
中科院分区：
文献类型：
--
作者：
Carina Haddad;E. Edirisinghe;Hope M. Brown;Alexis D. Ostrowski
已经采用不同的策略来改善软多糖基材料的物理化学和机械性能。这些策略中的一些包括共价交联或化学改性以及聚合物的共混。在另一种方法中，我们使用钒离子配位来产生动态共价键并获得具有增强性能的膜。我们使用果胶和壳聚糖（两种天然存在的多糖）制备生物基薄膜，并添加甘油作为增塑剂以增加材料的柔韧性和弹性。我们通过在V（V）溶液中浸泡将钒离子引入到薄膜中。通过FT-IR表征膜以检查膜内部的不同相互作用。扫描电子显微镜显示，在含V（V）的薄膜中，层合片的分离距离为0.16 μm，而在不含V（V）的薄膜中，层合片的分离距离为0.75 μm。流变学研究表明，V（V）配位膜具有更好的机械性能（更高的储能模量）和水稳定性比没有钒的膜。在用蓝光照射时，漫反射光谱和颜色分析显示膜的颜色随着照射从黄色到蓝色的变化，与V（V）到V（IV）的光化学还原一致。在光照射期间观察到模量的小变化，而在扫描电子显微镜中在膜内没有观察到显著的结构变化。这些结果表明，有可能通过多糖的官能团与金属离子的配位来产生稳健且水稳定的多糖基材料。
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.