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- The results showed that the CMC value of the products was decreasing as the degree of substitution was getting higher. 结果表明,临界胶束浓度(CMC值)随着取代度的提高而降低,较高取代度的淀粉样品具有良好的表面活性。
- Degree of substitution(DS) of carboxymethylinulin was analysed by spectrophotometric titration. 用光度滴定法测定了羧甲基菊粉的取代度。
- The influence of reaction conditions on the degree of substitution of acetylated starche was investigated. 以玉米淀粉为原料,醋酸酐为酯化剂,甲烷磺酸为催化剂,制备高取代度淀粉醋酸酯。
- The results showed that the water reducing ratio of sulfonated starch is increased with the degree of substitution(DS). 以氯磺酸为磺化试剂,半干法制备了磺化淀粉,并对其用作水泥减水剂的性能进行了系统的研究。
- Spectrophotometry and potentiometric titration are common methods to detect the degree of substitution of starch phos-phate ester. 分光光度计法和电位滴定法是测定淀粉磷酸酯取代度的常用方法。
- The relationship between the technological parameters and the degree of substitution of starch phosphate and caramel color was discussed. 同时，探讨了淀粉磷酸酯的取代度和焦糖色素的色率与操作参数之间的关系。
- The effect of HPS was better than that of octadecyl acrylate.The higher the degree of substitution, the higher the salt tolerance. 用羟丙基淀粉代替原淀粉的共聚产物对提高耐盐性效果更明显，取代度越高耐盐性能越好；
- Sodium carboxymethly starches(CMS)with high degree of substitution(DS) was synthesized from starch and chloroacetic acid in this paper. 以淀粉、氯乙酸为原料,异丙醇为溶剂合成羧甲基淀粉醚(CMS)。
- With the determined parameters of synthesis, we can obtain CMS with high degree of substitution of 1.10 in one step carboxymethylation process. 在所确定的最佳反应条件下，能制备取代度为1．10的羧甲基淀粉醚。
- In order to improve the serviceability of modified starch in sizing wool warp yarns, a series of starch carbamate with different degree of substitution were prepared. 摘要为提高变性淀粉浆料在毛纱上浆中的应用性能，制备了一系列具有不同取代度的氨基甲酸酯淀粉。
- A series of phthaloyl chitosans (PCS) with different degree of substitution of amic acid were synthesized from completely deacetylated chitosan at room temperature. 室温条件下从完全脱乙酰化壳聚糖出发合成了不同酰胺酸取代度的邻苯二甲酰化壳聚糖 ,并以此为标样 ,标样的取代度由X射线光电子能谱 (XPS)确定。
- In this paper, we used cationic starch with high degree of substitution as the flocculant, and the flocculation was satisfied when we put the starch into living sewage. 本文采用实验室研制的高取代度阳离子淀粉作为絮凝剂对造纸白水进行处理,获得良好的效果。
- RESULTS: The chemical structures of the synthesized compounds were confirmed by 1H NMR spectroscopy and the degree of substitution ranged from 0.30 to 0.43. 结果：合成的化合物的化学结构被1H核磁共振光谱学确认了，这种替代物的度数从0.;30到0
- Carboxymethyl starch with degree of substitution(DS)0 6 has been made from corn starch,chloroacetic acid and sodium hydroxide,and with ethyl alcohol as solvent. 用玉米淀粉、氯乙酸和氢氧化钠为原料，在乙醇溶剂中反应制备了取代度为0．6的羧甲基淀粉。
- In this paper,the prepararations for cationic etherity agent and the synthetic method for this guar gum with high degree of substitution have been researched. 研究了阳离子醚化剂的合成条件及高取代度阳离子胍胶的制备方法,制备条件温和,无环境污染,可工业化生产。
- She shows a high degree of skill in her work. 她在工作中表现出高度的技巧。
- The influences of reaction temperature, reaction time, acylating agent dosage and the concentration of cellulose on degree of substitution of the products were investigated. 探讨反应温度、反应时间、酰化剂用量以及纤维素浓度对反应产物取代度的影响。
- The chemical structure of the acetate starch was characterized by using IR spectrum.The degree of substitution (DS) and the content of acetyl of the products were determined. 用红外光谱仪对醋酸酯淀粉进行了初步表征，并用酸碱滴定法测试了其取代度和乙酰基含量；
- A private car gives a much greater degree of comfort and mobility. 私人小汽车能给人很大的舒服和机动性。
- Acetylated starches with high degree of substitution were synthesized from cornstarch with acetic anhydride as esterifying agent and methanesulphonic acid as catalyst. 以玉米淀粉为原料,丁二酸酐为酯化剂,以水为媒介,氢氧化钠为催化剂对低取代度淀粉丁二酸酯的制备工艺进行了研究。
