Controlling the structure and properties of semi-crystalline cellulose/silk-fibroin biocomposites by ionic liquid type and hydrogen peroxide concentration
Controlling the structure and properties of semi-crystalline cellulose/silk-fibroin biocomposites by ionic liquid type and hydrogen peroxide concentration
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DOI：
10.1016/j.carpta.2022.100193
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发表时间：
2022-02
影响因子：
5.5
通讯作者：
Stacy A. Love;Xiao Hu;David Salas-de la Cruz
中科院分区：
文献类型：
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作者：
Stacy A. Love;Xiao Hu;David Salas-de la Cruz
本研究报告了如何使用离子液体和各种混凝剂调节混合微晶纤维素/丝素生物复合材料的半结晶度。研究了共混1:1聚合物体系的形态和热性能随制备参数的变化规律。离子液体，1-乙基-3-甲基咪唑醋酸盐和1-乙基-3-甲基咪唑氯作为竞争溶剂类型，6种过氧化氢溶液（1-25%）加水作为不同的混凝剂。分析结果表明，溶剂阴离子类型（Ac−和Cl−）影响蛋白质二级结构的形成，溶剂阴离子类型和过氧化氢浓度改变再生材料的形态和热稳定性。溶解在1-乙基-3-甲基咪唑醋酸酯中的聚合物比溶解在1-乙基-3-甲基咪唑氯中的聚合物热稳定性差。此外，碳水化合物微晶尺寸与制造时过氧化氢浓度呈正相关，并且根据溶剂的阴离子类型计算出微晶尺寸的逐渐或阶梯过渡增加。
This work reports how to tune the semi-crystallinity of a blended microcrystalline cellulose/silk-fibroin biocomposite using ionic liquids and various coagulation agents. The morphological and thermal properties of a blended 1:1 polymeric system are studied as a function of polymer fabrication parameters. Ionic liquids, 1-ethyl-3-methylimidazolium acetate verses 1-ethyl-3-methylimidazolium chloride, are used as competing solvent types and six hydrogen peroxide solutions (1—25%) plus water are used as varying coagulation agents. Analysis of the results demonstrate that solvent anion type, Ac−verses Cl−, affects protein secondary structure formation, and that solvent anion type and the concentration of hydrogen peroxide changes morphology and thermal stability of the regenerated materials. Polymers dissolved in 1-ethyl-3-methylimidazolium acetate are less thermally stable than those dissolved in 1-ethyl-3-methylimidazolium chloride. Furthermore, carbohydrate microcrystal size is positively correlated to hydrogen peroxide concentration upon fabrication and is calculated to have either a gradual or step transition increase in microcrystal size depending upon the solvent's anion type.