Preparation of marine derived bionanofiers and their optically transparent high performance nanocomposites

以干燥的蟹壳为原料，去除蛋白质和矿物质后，在非干燥的n酸条件下进行简单的研磨处理，制得甲壳素纳米纤维。通过FE-SEM和声学观察得到的纳米纤维具有约10-20 nm的均匀宽度和较大的长径比，这两个发现都类似于虾纳米纤维的软管。此外，还证实了纳米纤维是从蟹壳的甲壳素/蛋白质/矿物复合材料中提取出来的。通过元素分析、红外光谱和X-射线衍射谱的分析证实，N-乙酰基没有被去除，甲壳素的晶体结构保持不变。甲壳素纳米纤维由于具有延展的晶体结构的增强作用，大大提高了所有丙烯酸树脂的杨氏模数和拉伸强度，并降低了其热膨胀。

Chitin nanofibers were prepared from dried crab shells by a simple grinding treatment in a never-dried state under n acidic condition after the removal of proteins and minerals. The obtained nanofibers were observed by FE-SEM and ound to have a uniform width of approximately 10-20 nm and high aspect ratio; both these findings were similar to hose for nanofibers from prawns. Furthermore, it was confirmed that the nanofibers were extracted from the aturalchitin/protein/mineral composites of crab shell in their original state. That is, the N-acetyl group was not emoved and the chitin crystal structure was maintained, as confirmed by elemental analysis data, FT-IR spectra, and X-ray diffraction profiles.Optically transparent chitin nanofiber composites were fabricated with acrylic resins. Chitin nanofibers rastically increased the Young's moduli and the tensile strengths, and decreased the thermal expansion of all acrylic resins due to the reinforcement effect of chitin nanofibers having an extended crystal structure.