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1)  high degree of substitution
高取代度
1.
Synthesis and characterization of starch acetate of high degree of substitution;
高取代度淀粉醋酸酯的合成及表征
2.
Study on preparation of starch acetate with high degree of substitution by microwave with the high amylose
高直链淀粉微波制备高取代度醋酸酯淀粉的研究
3.
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,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。
2)  high molar substitution
高取代度
1.
The reological properties of hydroxypropyl tapioca starch solution with high molar substitution as well as the effect of hydroxypropylation extent on them have been studied in this work.
研究了高取代度羟丙基木薯淀粉溶液(分子取代度MS=1。
2.
The effect of concentration, temperature and pH value on the rheological properties of hydroxypropyl tapioca starch with high molar substitution have been investigated in this work.
研究了浓度、温度和pH值对高取代度羟丙基木薯淀粉溶液流变特性的影响。
3.
Rheological properties of hydroxypropylated corn starch with high molar substitution and its affecting factors were studied.
研究了高取代度羟丙基玉米淀粉溶液的流变学性质及其影响因素。
3)  high substitution
高取代度
1.
In our experiments,a quarterndry amine cationic starch ether with high substitution degree was made from corn starch and 3-chloro-2-hydroxypropyl-trimethyl-ammonium chloride(CHPTMA) by pre-dry process.
用玉米淀粉与3—氯—2—羟丙基三甲基氯化铵(CHPTMA)为原料,通过预干燥干法制得高取代度季铵型阳离子淀粉醚,经洗涤抽滤制得不含氯离子的高取代度阳离子淀粉(C-2阳离子淀粉)代替普通阳离子淀粉应用在精制牛皮纸的生产中。
2.
This paper deals with the preparation of the ca ti onic starch on the degree of high substitution through the half dry way.
通过半干法制备高取代度阳离子淀粉。
4)  high degree substitution
高取代度
1.
The preparation techniques of high degree substitution cationic starch at home and abroad were summarized,which were wet process,dry process,and semi-dry process.
综述了国内外高取代度阳离子淀粉的制备方法,包括湿法、干法、半干法的合成工艺,以及高取代度阳离子淀粉在造纸、纺织、废水处理等方面的应用研究进展,指出阳离子淀粉正越来越广泛地用于实验室研究,其在蛋白质分析、药物载体、石油采收方面的应用在逐步发展中,阳离子淀粉的应用得到了进一步的推广。
5)  degree of substitution
高取代度
1.
Study on the production technique of the water-soluble starch pHospHates with high degree of substitution
高取代度水溶性农用磷酸酯淀粉生产工艺的研究
2.
The effects of the amounts of sodium hydroxide,reaction medium,reaction temperature,reaction time on the degree of substitution(DS)and reaction efficiency(RE)were investigated.
20的高取代度羧甲基玉米淀粉(CMCS)。
6)  preparation/high degree of substitution
制备/高取代度
补充资料:取代度
分子式:
CAS号:

性质:常用DS表示。纤维素醚是纤维素分子莲上的羟基为醚基取代的产物,平均每个失水葡萄糖单元上被反应试剂取代的羟基数目,称为取代度。由于纤维素分子链中每个失水葡萄糖单元上只有3个羟基能被取代,所以取代度只能小于或等于3。当纤维素醚形成侧向分歧的醚时,平均每个失水葡萄糖单元上所结合的取代醚基总量用摩尔取代度(molar degree of substitution, MS)表示。MS的大小与侧链形成的程度有关,理论上MS值可以是无限的。对纤维素烷基、羧烷基和酰基衍生物,DS和MS是相同的;对纤维素羟烷基衍生物,当一个羟烷基被引入纤维素分子链时,就形成一个附加的羟基,这个羟基本身又可被羟烷基化,因而,在纤维素分子链上可形成相当长的侧链,所以通常,MS大于DS,MS大小视侧链形成的程度而定。

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