使用大豆蛋白与纳米纤维素制备复合材料,研究了乙二醇添加剂对两组分相容性的影响; 通过红外光谱分析和热分析,阐明了乙二醇提高复合体系中两组分相容性的机理。研究表明:对于纯大豆蛋白,热压导致羟基与蛋白质上的酰胺Ⅰ带的红外吸收峰分别由3 420 cm-1和1 641 cm-1红移至3 272 cm-1和1 626 cm-1,说明乙二醇与大豆蛋白酰胺键之间形成了氢键相互作用; 纳米纤维素的加入增强了氢键缔合,使酰胺Ⅰ带发生进一步微弱红移; 热分析研究发现,纳米纤维素的加入提高了乙二醇/水的气化温度,表明它们参与了氢键的形成过程; 同时认为,乙二醇以氢键的形式连接了大豆蛋白与纳米纤维素,从而提高了两组分之间的相容性。
Abstract
This study mainly focused on the composites of the soy protein and nanocellulose, especially on the effect of ethylene glycol as an additive on the compatibility of the composites. By using infrared spectra and thermal analysis, the mechanism of the improved compatibility by ethylene glycol was analyzed. The results revealed that the hydrogen bonding formed between hydroxyl on ethylene glycol and amide Ⅰ on soy protein, indicated by the red shift of hydroxyl and amide Ⅰ from 3 420 cm-1 and 1 641 cm-1 to 3 272 cm-1 and 1 626 cm-1 after hot pressing, respectively. Further more, slight red-shifted amide Ⅰ indicated an enhanced hydrogen bonding after addition of nanocellulose. The thermal analysis revealed that boiling points of water and ethlylene glycol were elevated in presence of nanocellulose, and it also indicated that the small molecules helped the formation of hydrogen bonding. Finally, a mechanism was proposed that the ethylene glycol acts as a“bridge” between the soy protein and nanocellulose by hydrogen bonding, which makes the two components compatible with each other.
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基金
收稿日期:2015-04-17 修回日期:2015-06-26
基金项目:国家自然科学基金项目(31400515); 江苏省“青蓝工程”(科技创新团队)项目; 江苏高校优势学科建设工程资助项目(PAPD)
第一作者:陈敏智,讲师,博士。*通信作者:周晓燕,教授。E-mail:zhouxiaoyan@njfu.edu.cn。
引文格式:陈敏智,陈燕,周晓燕. 乙二醇提高大豆蛋白/纳米纤维素复合材料相容性的研究[J]. 南京林业大学学报:自然科学版,2015,39(6):143-147.
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