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非均相磺化法制备磺化聚砜超滤膜材料 总被引:3,自引:1,他引:3
本文采用非均相磺化反应方法,制备了低磺化度的磺化聚砜。它可以满足制备较低截留分子量超滤膜的要求。与均相磺化方法相比此法操作简便,溶剂易于回收再用,可供工业生产磺化聚砜超滤膜材料使用。 相似文献
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聚砜超滤膜的制备及结构性能研究 总被引:1,自引:0,他引:1
实验以低分子量的PEG作为添加剂制备聚砜超滤膜,通过不同低分子量和不同含量的PEG加入,改变了膜结构性能。制膜液由聚砜(PSf)/二甲基乙酰胺(DMAc)/聚乙二醇(PEG)组成。通过水通量、截留率和电镜图来评价添加剂对膜的性能结构影响。 相似文献
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上海医药工业研究院用聚砜材料试制出内壁中空纤维超滤膜,分子量截留值为5万,净水通量大于100升/25℃米~2·时。同时,研制成膜面积0.07、0.8、4.0米~2的LF型内压式聚砜中空纤维超滤组件。 相似文献
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5-溴水杨醛改性壳聚糖的制备及吸附性能 总被引:4,自引:0,他引:4
制备了两种不同形态的改性壳聚糖希夫碱:微粒化的壳聚糖希夫碱(P-CTSS),未微粒化的壳聚糖希夫碱(CTSS),并研究了它们分别对Cu^2+,Pb^2+,Cd^2+及Zn^2+的吸附性能,考察了pH值、时间等因素对吸附性能的影响。结果表明,P-CTSS较CTSS易于粉碎,且吸附性能较好。CTSS对Cu^2+,Pb^2+,Cd^2+及Zn^2+的吸附容量分别为:15.21、10.35、12.13、9.28mg/g,而P-CTS对Cu^2+,Pb^2+,Cd^2+及Zn^2+的吸附容量分别为:37.46、15.84、16.34、13.67mg/g,P-CTSS对Cu^2+的吸附率在2.5h内达到84.5%左右,具有一定的选择性吸附。 相似文献
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M.G. Vizcarra-Mendoza R.S. Ruiz-Martinez C. Martinez-Vera A. Iruegas-Evaristo J.M. Carrillo-Guerreno 《Drying Technology》2013,31(9-10):1843-1853
ABSTRACT This work is divided into two distinct parts: i) a study of the cleaning of pollen by encrainment with air and determination of the parameters that permit efficient levels of separation; and ii) a consideration of the drying of pollen by fluidization and an assessment of its effect on product quality. The pollen utilized consisted of fresh material, collected from traps in beehives, and characterized in terms of organic and inorganic materials. The physical properties of each of these materials, as well as their respective hydrodynamic behaviour when fuidized, were determined. Based on a statistical experiment design, it was found that superficial air velocity and pollen inventory in the dryer are major factors that affect cleaning. Results also show that the drying of pollen by fluidization is controlled by transport within the particles and, therefore, temperature was the major factor affecting drying rate and the one which determined product quality. 相似文献
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以Y2O3、Y(C2H3O2)3和Bi2O3为原料,采用高温固相反应合成铋酸钇(YBiO3)。借助热重-差热、X射线衍射、SEM等分析手段,探讨了不同原料、煅烧温度、保温时间、预烧等因素对铋酸钇合成的影响。结果表明:高温固相反应能够合成高纯度的铋酸钇;与Y(C2H3O2)3相比,Y2O3是合成YBiO3的较佳原料,其合成YBiO3的最低温度是766℃左右,YBiO3的开始分解温度是917℃左右;合成YBiO3的较佳工艺为两磨两烧,在800℃预烧90min,其较佳工艺参数为煅烧温度为900℃,保温时间120min。 相似文献
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M.G. Vizcarra-Mendoza R.S. Ruiz-Martinez C. Martinez-Vera A. Iruegas-Evaristo J.M. Carrillo-Guerreno 《Drying Technology》1998,16(9):1843-1853
This work is divided into two distinct parts: i) a study of the cleaning of pollen by encrainment with air and determination of the parameters that permit efficient levels of separation; and ii) a consideration of the drying of pollen by fluidization and an assessment of its effect on product quality. The pollen utilized consisted of fresh material, collected from traps in beehives, and characterized in terms of organic and inorganic materials. The physical properties of each of these materials, as well as their respective hydrodynamic behaviour when fuidized, were determined.
Based on a statistical experiment design, it was found that superficial air velocity and pollen inventory in the dryer are major factors that affect cleaning. Results also show that the drying of pollen by fluidization is controlled by transport within the particles and, therefore, temperature was the major factor affecting drying rate and the one which determined product quality. 相似文献
Based on a statistical experiment design, it was found that superficial air velocity and pollen inventory in the dryer are major factors that affect cleaning. Results also show that the drying of pollen by fluidization is controlled by transport within the particles and, therefore, temperature was the major factor affecting drying rate and the one which determined product quality. 相似文献
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RFI工艺制备复合材料板材研究 总被引:1,自引:1,他引:1
利用自制的环氧树脂膜,采用RFI工艺制备了薄平板、曲面板、加筋板、厚平板,初步确定了成型工艺参数并对板材的性能进行了研究。结果表明,自制的环氧树脂膜可用于RFI工艺制备薄平板、曲面板,树脂浸润性良好,纤维体积含量达到了44.8%,力学性能优良;加筋板与厚平板有贫胶现象。 相似文献
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以溶菌酶为模拟体系对体积排阻色谱法进行蛋白质折叠过程实验研究 .圆二色性光谱法分析结果证实了复性溶菌酶与天然溶菌酶的二级结构一致性 ;复性溶菌酶与天然溶菌酶色谱保留体积的差异揭示出折叠过程中无活性蛋白质聚集体的存在及其向复性蛋白质转化的机制 ;不同初始浓度的复性实验证实了蛋白质聚集体的存在及其与变性蛋白质初始浓度的关系 ;采用短色谱柱的折叠分离实验结果表明蛋白质折叠是一个快速过程 ;不同尿素浓度下的折叠分离实验结果表明尿素在SEC法中具有非常重要的作用 .与稀释复性法的对比实验表明 :体积排阻色谱法具有稀释倍数小、复性产品活性收率高、复性蛋白质浓度高等优点 . 相似文献