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首页> 外文期刊>Journal of Applied Polymer Science >Cellulose crystallite sizes in diploid and tetraploid native cotton
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Cellulose crystallite sizes in diploid and tetraploid native cotton

机译：二倍体和四倍体原生棉中的纤维素微晶尺寸

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Cellulose crystallite sizes in directions perpendicular to (101), (10(1) over bar), and (002) planes, have been estimated from X-ray powder diffraction patterns. The diffraction peaks were resolved using the FIT X-ray diffraction data analysis program (written by SOCABIM, Siemens DIFFRAC AT Software System, Siemens, Germany). The complete data for all the three equatorial planes was analyzed for 2 theta, d values, full width at half-maximum (FWHM), and the normalized area under the three diffraction peaks, for seven cotton cultivars grown at four different locations in India in different crop years. The mean crystallite sizes were determined using the Scherrer equation. The reference standard included degummed and purified ramie fibers for relative crystallinity estimation in cotton cultivars. It has been observed that, though the computed crystallite sizes corresponding to (101), (10(1) over bar), and (002) planes vary within individual varieties with location and year of growth, the combined average crystallite size corresponding to (101) and (10(1) over bar) planes taken together for individual varieties from all locations and crop years is close to the combined average crystallite size corresponding to the (002) planes, irrespective of the species of cotton. The values of the average relative crystallinity with respect to highly oriented degummed and purified ramie fibers of individual varieties from all locations and crop years do not significantly vary between varieties and species of cotton. It is visualized that variations in crystallite sizes arise as a result of the differences in the amount of cellulose synthesized within fibers of individual varieties and their disposition within the matrix of their developing fibers. (C) 1998 John Wiley & Sons, Inc. [References: 38]
机译：已经根据X射线粉末衍射图谱估计了与（101）平面，（bar上的10（1）平面）和（002）平面垂直的方向的纤维素微晶尺寸。使用FIT X射线衍射数据分析程序（由SOCABIM，西门子DIFFRAC AT软件系统，西门子，德国编写）解析衍射峰。分析了印度三个不同地点生长的七个棉花品种的两个赤道平面的完整数据，包括2个θ，d值，半峰全宽（FWHM）和三个衍射峰下的归一化面积。不同的作物年份。平均晶体尺寸使用Scherrer方程确定。参考标准包括脱胶和纯化的麻纤维，用于评估棉花品种的相对结晶度。已经观察到，尽管计算出的与（101），（10（1）bar以上）和（002）平面相对应的微晶尺寸在单个品种中随位置和生长年份的不同而变化，但组合的平均微晶尺寸对应于（来自所有位置和作物年份的单个品种的101）和（bar上方的10（1）平面）相近，与（002）平面相对应的组合平均微晶尺寸接近，而与棉花的种类无关。在各个品种和不同棉花年间，各个品种的高度定向脱胶和纯化的麻纤维的平均相对结晶度值均无显着差异。可以看出，由于单个品种的纤维内合成的纤维素量的不同以及它们在其发育中的纤维的基质中的分布，导致微晶尺寸的变化。 （C）1998 John Wiley＆Sons，Inc. [参考：38]

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