摘要
以羧甲基壳聚糖(carboxymethyl chitosan,CMC)、氯化钙和碳酸钠为原料,采用超声波辅助低温共沉淀法,在反应温度为0℃、CMC添加量为5%(质量分数)和反应时间为12 s条件下,快速制得形貌独特、孔径集中于0.6~8.0 nm的分级多孔六边形球霰石型碳酸钙板块,并用颗粒附着结晶机理解释了其形成过程。在共混制备碳酸钙/壳聚糖复合膜中,六边形球霰石板块的表观粒度大、容易分散,而且其分级孔隙结构便于壳聚糖的快速渗入,从而提升了壳聚糖与碳酸钙之间的界面相容性,使壳聚糖/碳酸钙复合膜展现出优异的力学性能:当分级多孔六边形球霰石板块的添加量达6%(质量分数)时,壳聚糖/碳酸钙复合膜的抗拉强度高达44.2 MPa,断裂伸长率为11.4%。该研究为探索碳酸钙的生物矿化机理和高性能复合膜的制备提供了新的思路。
The unique micron-sized hierarchical porous hexagonal vaterite plate with pore diameter concentrated at 0.6~8.0 nm was rapidly prepared under the conditions of reaction temperature 0℃,carboxymethyl chitosan dosage 5%(mass fraction)and ultrasonic time only 12 s by low-temperature co-precipitation method with the aid of ultrasound,using carboxymethyl chitosan(CMC),calcium chloride and sodium carbonate as raw materials.Its formation process was explained by the crystallization mechanism of particle attachment.In the preparing process of chitosan/calcium carbonate composite membrane by blend method,the apparent particle size up to the micrometer-scale can conducive to promoting the homogeneous dispersion of hexagonal vaterite plate in the chitosan solution.Especially,such a hierarchical pore structure of hexagonal vaterite plate is convenient for the rapid infiltration of chitosan molecules,thus improving the interface compatibility between chitosan matrix and calcium carbonate.The obtained chitosan/calcium carbonate composite membrane present excellent mechanical properties:the tensile strength reached 44.2 MPa and the tensile elongation at break was 11.4%,when the amount of hierarchical porous hexagonal vaterite plate was 6%(mass fraction).The research results provided a way for exploring the biomineralization mechanism of biological calcium carbonate and the preparation of high-performance composite membrane.
作者
雷宇
唐琴
陈先勇
LEI Yu;TANG Qin;CHEN Xianyong(School of Chemistry and Environmental Engineering,Hubei Minzu University,Enshi 445000,China;Hubei Key Laboratory of Biological Resources Protection and Utilization,Enshi 445000,China)
出处
《湖北民族大学学报（自然科学版）》
CAS
2023年第1期19-26,50,共9页
Journal of Hubei Minzu University:Natural Science Edition
基金
国家自然科学基金项目(21661012)
生物资源保护与利用湖北省重点实验室项目(PT012215)。
关键词
低温共沉淀法
分级多孔结构
六边形球霰石板块
碳酸钙
复合膜
low-temperature co-precipitation method
hierarchical porous structure
hexagonal vaterite plate
calcium carbonate
composite membrane
