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首页> 外文期刊>Journal of Applied Polymer Science >Effect of the Agitation Rate on the Generation of Low-Crystallinity Cellulose from Phosphoric Acid
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Effect of the Agitation Rate on the Generation of Low-Crystallinity Cellulose from Phosphoric Acid

机译：搅拌速率对磷酸生成低结晶度纤维素的影响

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Changes in the basic powder properties of low-crystallinity powder cellulose (LCPC) as a function of the agitation rate used during its generation from phos-phoric acid were investigated.We reacted cotton linter with phosphoric acid (85% w/v) at room temperature for an hour and then at 50 deg C for 3 h to produce the LCPC solution.The latter was slowly added to water (ca.10 times the volume of phosphoric acid used) at a constant agitation rate of 700,2000, or 4000 rpm.LCPC powder thus formed was collected by filtration,washed with water and acetone,and dried at 30 deg C.Scanning electron micrographs showed the three products to be highly aggregated in structure.The crystallinities of LCPC prepared at 700,2000,and 4000 rpm were 39,31,and 24%,respectively.The crystalline component of LCPC produced at 700 and 2000 rpm contained both cellulose II (major component) and cellulose I (minor component),whereas LCPC generated at 4000 rpm belonged to the cellulose II crystal lattice.The porosity and true,bulk,and tap densities of LCPC made at 4000 rpm were 88.55% and 1.435,0.138,and 0.164 g/cc,respectively.The corresponding values for LCPC made at 700 and 2000 rpm were 60.30% and 1.452,0.541,and 0.576g/cc and 54.49% and 1.465,0.583,and 0.667 g/cc,respectively.Avicel PH-101,in contrast,had a degree of crys-tallinity of 89% and a true density value of 1.577 g/cc.The porosity,bulk density,and tap density values were intermediate to those of LCPC made at 4000 rpm and 700 or 2000 rpm.
机译：研究了低结晶度粉末纤维素（LCPC）的基本粉末性质随磷酸生成过程中使用的搅拌速率的变化。我们在室温下使棉绒与磷酸（85％w / v）反应加热一小时，然后在50摄氏度下加热3小时，制得LCPC溶液，以700,2000或4000的恒定搅拌速率将其缓慢添加到水中（约为所用磷酸体积的10倍）过滤收集由此形成的LCPC粉末，用水和丙酮洗涤，并在30摄氏度下干燥。扫描电子显微镜照片显示三种产物在结构上高度聚集.LCPC的结晶度分别为700、2000和4000 rpm分别为39、31和24％。以700和2000 rpm产生的LCPC的结晶成分同时包含纤维素II（主要成分）和纤维素I（次要成分），而以4000 rpm产生的LCPC属于纤维素II晶格孔隙率在4000 rpm下制造的LCPC的真实，散装和分接密度分别为88.55％和1.435、0.138和0.164 g / cc。在700和2000 rpm下制造的LCPC的对应值分别为60.30％和1.452、0.541和分别为0.576g / cc和54.49％，1.465、0.583和0.667 g / cc。相比之下，Avicel PH-101的哭泣度为89％，真实密度值为1.577 g / cc。孔隙率，堆积密度和振实密度值是在4000 rpm和700或2000 rpm下制备的LCPC的中间值。

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