摘要
通过硫酸水解降解法由棉纤制备了纳米微晶纤维素,并将纳米微晶纤维素与壳聚糖共混,制备了壳聚糖/纳米微晶纤维素复合膜.通过红外光谱、XRD、偏光显微及TEM的分析结果表明:所制得的纳米微晶纤维素具有与壳聚糖基本一致的化学组成和结晶结构,纳米微晶纤维素为长数百纳米、直径数十纳米的针状纤维,分散均匀.CS/NCC复合膜的FTIR及XRD分析结果表明,CS与NCC间存在着较强的相互作用,使CS的晶面间距减小、结晶程度增大,NCC的非晶弥散峰消失;通过POL观察发现,NCC在CS结晶过程中起到异相成核作用,使CS球晶尺寸减小,数量增加;拉伸性能测试表明,NCC的加入可显著提高CS/NCC复合膜的拉伸强度,当NCC质量分数为25%时,拉伸强度为41 MPa,比CS膜提高了86%.
Nanocrystal cellulose（NCC） was prepared from cotton fiber（CF） by sulfuric acid treatment, and nanocomposite films were prepared from chitosan（CS） as the matrix and NCC as the reinforcing phase. NCC was characterized by FTIR, XRD and EA, the result showed that NCC basically the same with CF in chemical composition and crystal structure. TEM analysis indicated that NCC was a kind of needle-like fiber with several hundred nanometers long and dozens of nanometers in diameter. Resulting film were characterized using FTIR , XRD and POL, the resulting indicated that favorable interactions between NCC and CS were evidenced and assumed to be partially responsible for a decrease of the crystallinity of the matrix.. Tensile property test indicated that tensile strength of nanocomposite filmes were remarkable enhanced, when content of NCC was 25wt%, tensile strength is 41Mpa, enhanced 86% compared to CS film. NCC is a good modifier candidate for CS in crystallization structure and mechanical properties.
出处
《材料研究与应用》
CAS
2008年第4期405-408,共4页
Materials Research and Application
