Structural characteristics of silk fibers treated with epoxides
Structural characteristics of silk fibers treated with epoxides
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环氧化物处理的丝纤维的结构特性
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
H. Shiozaki
中科院分区：
文献类型：
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作者：
M. Tsukada;M. Nagura;H. Ishikawa;H. Shiozaki
通过折射率测定、差示扫描量热法、热机械分析和强伸性测定，阐明了环氧改性丝素纤维的结构特征。使用的四种环氧化物是缩水甘油（G）、乙二醇二缩水甘油醚（E）、甲苯基缩水甘油醚（T）和间苯二酚二缩水甘油醚（R）。丝纤维的各向同性折射率在T或R的作用下增大。的吸热峰的位置归因于热分解和位置的起始收缩的每一个用环氧化物处理的样品转移到更高的温度，表明更多的热稳定性。然而，从X-射线衍射分析评价的样品的分子取向和结晶度的值保持不变，无论环氧化物处理。这些实验结果已被解释在相邻的丝素蛋白分子之间的交联和连接到丝素蛋白的侧链的环氧化物分子的羟基之间的氢键。
Structural characteristics of the silk fibroin fiber-modified with epoxide treatment were elucidated by refractive index measurement, differential scanning calorimetry, and thermomechanical analysis and on the basis of strength–elongation measurements. The four epoxides used were glycidol (G), ethylene glycol diglycidyl ether (E), tolyl glycidyl ether (T), and resorcinol diglycidyl ether (R). The values of the isotropic refractive index of the silk fiber increased by the action of T or R. The position of the endothermic peak attributed to the thermal decomposition and the position of the onset of the contraction of each of the samples treated with epoxides shifted to higher temperature, suggesting the more thermal stability. However, the values of the molecular orientation and the crystallinity of the specimen evaluated from X-ray diffraction analysis remained unchanged regardless of the epoxide treatment. These experimental results have been interpreted in terms of the cross-links between the adjacent silk fibroin molecules and of the hydrogen bonds between the hydroxyl groups of the epoxide molecules attached to the side chains of the silk fibroin.