超临界CO_2流体温度对羊毛纤维结构的影响  

Effect of temperature on the structure of wool fiber in supercritical CO_2

作　　者：余志金[1,2] 龙家杰[1,2] 毕潇平[1,2] 钱静[1,2] 蒋耀兴[1,2] 程安康 

机构地区：[1]现代丝绸国家工程实验室(苏州),江苏苏州215123 [2]苏州大学纺织与服装工程学院,江苏苏州215021 [3]吴江飞翔印染有限公司,江苏吴江215228

出　　处：《毛纺科技》2012年第2期7-11,共5页Wool Textile Journal

基　　金：国家自然科学基金项目(项目编号:NSFC21076133);江苏省自然科学基金项目(项目编号:BK2008163);江苏省第十一批科技创新与成果转化(重大科技支撑与自主创新)专项引导资金项目(项目编号:BE2008066);苏州大学纺织科学与工程江苏省高校优势学科一期建设项目

摘　　要：采用扫描电镜(SEM)、X-射线粉末衍射(WAXS)、红外光谱(FI-IR)和热重分析(TG-DTG)法,探讨了在超临界CO2流体介质中处理温度对羊毛纤维的表面形态、聚集态结构和化学结构的影响。结果表明,经不同温度的超临界CO2流体处理后,羊毛纤维外覆鳞片梢部出现明显破损,其可见高度、厚度和覆盖密度降低;纤维中α-螺旋、β-折叠结晶和纤维结晶度得到不同程度提高,同时超临界CO2流体对纤维晶体有膨化迹象;纤维大分子链段中间的氢键缔合作用得到增强,且随处理温度提高,纤维大分子链段构象由α-螺旋向β-折叠转变明显,纤维鳞片层中部分胱氨酸的二硫键有氧化或酸解断裂现象;羊毛纤维的热稳定性有所提高。The effects of temperature on the surface morphology,aggregation and chemical structures of wool fiber in supercritical CO2 fluid were investigated by scanning electron microscope（SEM）,X-ray powder diffraction（WAXS）,fourier transform infrared spectroscopy（FT-IR）,thermogravimetric analysis（TG-DTG） technology.The results indicated that with the temperature increasing in supercritical CO2 fluid,a notable etching effect or dilapidation at the tip of scale of wool fiber was observed with a decrease in height,thickness and covering density of wool scale,and an improvement of crystallization both in α-helix and β-sheet structures were obtained,which resulting in an increased crystal ratio of fiber,and a swelling effect on crystal was also observed due to the supercritical CO2 fluid.Furthermore,more powerful interactions of hydrogen bonds among the macromolecular chains were investigated accompanying with a significant transformation of α-helix to β-sheet structure,as well as an oxidation or acidic hydrolysis of disulfide bonds in cystine of scale with treatment temperature increasing.An enhanced thermal stability of wool fiber was also observed after a treatment in supercritical CO2 fluid.

关 键 词：超临界CO2 羊毛纤维 表面形态 聚集态结构 热稳定性 

分 类 号：TS195.6[轻工技术与工程—纺织化学与染整工程]