Chitosan/organic rectorite nanocomposites rapidly synthesized by microwave irradiation: effects of chitosan molecular weight
Chitosan/organic rectorite nanocomposites rapidly synthesized by microwave irradiation: effects of chitosan molecular weight
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DOI：
10.1039/c5ra13939b
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发表时间：
2015-10
期刊：
影响因子：
3.9
通讯作者：
H. Siqi;Zhiming Yu;Chusheng Qi;Zhang Yang
中科院分区：
文献类型：
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作者：
H. Siqi;Zhiming Yu;Chusheng Qi;Zhang Yang
将高分子量壳聚糖（CSH）和低分子量壳聚糖（CSL）插入有机累托石（OREC）中，通过微波辐照75 min制备壳聚糖/有机累托石纳米复合材料（CSHOR和CSLOR），其效率远高于传统加热48 h的方法。采用XRD、FT-IR、zeta电位等分析手段对复合材料的结构和插层机理进行了表征，并探讨了壳聚糖（CS）分子量对复合材料形貌、结晶行为、热稳定性和抗菌性能的影响。结果表明：(1)CSH和CSL成功嵌入到硅酸盐层中形成嵌入纳米复合材料，层间距可分别增大到5.14 nm和6.40 nm；(2) CS和OREC通过氢键和静电相互作用结合在一起。(3)与CSH和CSL相比，CSHOR和CSLOR的热稳定性和抗菌性能均有显著提高。(4)随着CS分子量的减小，OREC层间距离的增加，纳米复合材料的形态和结晶发生变化，抗菌活性增强，但不影响热稳定性。
Chitosans with high and low molecular weight (CSH and CSL) were intercalated into organic rectorite (OREC) to prepare chitosan/organic rectorite nanocomposites (CSHOR and CSLOR) via a microwave irradiation method for 75 min, which was found to be much more efficient than the conventional 48 h heating method. The structure and intercalation mechanism of the nanocomposites were investigated by XRD, FT-IR, and zeta potential analysis, and the effects of chitosan (CS) molecular weight on the morphology, crystallization behavior, thermal stability, and antibacterial properties of the nanocomposites were explored. The results indicated that: (1) CSH and CSL were inserted successfully into the silicate layers to form the intercalated nanocomposites, and interlayer spacing could be increased to 5.14 nm and 6.40 nm, respectively. (2) CS and OREC were joined together through hydrogen bonding and electrostatic interaction. (3) Compared to CSH and CSL, the thermal stability and antibacterial properties of both CSHOR and CSLOR were significantly improved. (4) With decreasing CS molecular weight the interlayer distance of OREC increased, which resulted in morphological and crystallization changes to the nanocomposites and enhanced antibacterial activity without impacting thermal stability.