Studies on some physical properties and structural characteristics of methyl methacrylate‐grafted silk fiber
Studies on some physical properties and structural characteristics of methyl methacrylate‐grafted silk fiber
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DOI：
10.1002/app.1988.070350411
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发表时间：
1988-03
影响因子：
3
通讯作者：
M. Tsukada
中科院分区：
文献类型：
--
作者：
M. Tsukada
采用X射线衍射、差示扫描量热分析、热重分析和扫描电镜研究了甲基丙烯酸甲酯接枝桑蚕丝纤维的结构特征和物理性能。接枝率大于30%的甲基丙烯酸甲酯（MMA）接枝丝纤维在320°C和390-410°C出现两个吸热峰，分别归因于填充在纤维中的丝素蛋白和MMA聚合物的热分解。这些DSC结果表明，MMA接枝的丝素蛋白分子与MMA聚合物之间的相容性较差。MMA接枝的丝纤维的重量降低，如在160°C下在热重分析热谱图上观察到的，这是由于水从样品中蒸发，接枝产率增加。MMA接枝后丝纤维的结晶结构没有发生变化。考虑到X-射线衍射图案和随着反应时间的增加的接枝产率，假设MMA聚合物的接枝链已经渗透到弱聚集体区域，而不是在丝素蛋白的结晶区域。
Structural characteristics and physical properties of methyl methacrylate-grafted silk fiber from Bombyx mori were studied by X-ray diffractometry, differential scanning calorimetry (DSC), thermogravimetry, and scanning electron microscopy. Methyl methacrylate (MMA)-grafted silk fiber with a grafting yield of more than 30% showed two endothermic peaks at 320°C and 390–410°C, which are attributed to the thermal decomposition of silk fibroin and MMA polymer filled in the fiber, respectively. These DSC results indicate that MMA-grafted silk fiber showed a poor compatibility in the relation between the silk fibroin molecules and MMA polymer. The weight of the MMA-grafted silk fiber decreased as observed at 160°C on the thermogravimetric thermograms due to the evaporation of water from the sample with increasing graft yield. The crystalline structure of MMA-grafted silk fiber remained unchanged regardless of MMA grafting. Taking into account the X-ray diffraction patterns and the increasing graft yield with reaction time, it is assumed that the graft chains of MMA polymer have penetrated into a weak aggregate region and not in the crystalline region of silk fibroin.