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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical properties of silk fibroin-microcrystalline cellulose composite films
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Mechanical properties of silk fibroin-microcrystalline cellulose composite films

机译：丝素蛋白-微晶纤维素复合膜的力学性能

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Silk fibroin-microcrystalline cellulose (cellulose whisker) composite films with varied compositions were prepared by casting mixed aqueous solution/suspensions of the two components. Silk fibroin was dissolved in 10M LiSCN followed by dialysis; a cellulose whisker suspension was prepared by sulfuric acid hydrolysis of tunicate cellulose. Macroscopically homogeneous films were obtained at all mixing ratios. While the Young's modulus of the composite films showed a linear, additive dependence on the mixing ratio, the tensile strength and ultimate strain showed a maximum at a 70-80% cellulose content, reaching five times those of fibroin-alone or cellulose-alone films. At the same mixing ratio, infrared spectra of the composite films showed a shift of the amide I peak from 1654 to 1625 cm(-1), indicating the conformational change of fibroin from a random coil to a P structure (silk 11) at the whisker-matrix interface. This change seems to be induced by contact of fibroin molecules with a highly ordered surface of cellulose whisker. (C) 2002 Wiley Periodicals, Inc. [References: 22]
机译：通过流延两种组分的混合水溶液/悬浮液来制备具有不同组成的丝素蛋白-微晶纤维素（纤维素晶须）复合膜。将丝素蛋白溶解在10M LiSCN中，然后进行透析;纤维素晶须悬浮液是通过硫酸水解被覆纤维素制备的。在所有混合比下均获得了宏观均匀的薄膜。虽然复合膜的杨氏模量显示出线性，加性取决于混合比，但拉伸强度和极限应变在纤维素含量为70-80％时显示出最大值，是单独使用纤维蛋白或单独使用纤维素的膜的五倍。在相同的混合比下，复合膜的红外光谱显示酰胺I峰从1654移至1625 cm（-1），表明纤维蛋白的构象从无规卷曲变为P结构（第11丝）。晶须矩阵接口。这种变化似乎是由纤维蛋白分子与纤维素晶须的高度有序表面接触引起的。 （C）2002 Wiley Periodicals，Inc. [参考：22]

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