Resins with narrow molecular-weight distribution can have lower die swell, but this doesn't necessarily mean less buildup.
具有窄分子量分布的树脂会有低的出口膨胀，但这不意味着它一定有较少的口模积料。
And by improving the craftwork of precipitation of PCS, the narrow molecular weight distribution of PCS was got.
并改进了逐步沉淀分级工艺，对PCS进行沉淀分级，得到了窄分布的分级样品。
The controlling methods of polymeric dispersant with low polymerization degree and narrow molecular weight distribution were introduced.
介绍了低聚合度、窄分子量分布的聚合物分散剂的控制方法。
Various fractions of tannins with different polarities and relatively narrow molecular weight distribution were obtained by extractions using ether and ethyl acetate sequently .
通过乙醚和乙酸乙酯萃取可得到极性不同的组分。分析表明，各级分的分子量分布范围不同，且相对较窄。
Liaohe FCCDO is a better raw material to produce needle coke because it has a high content of aromatics, low content of asphalt and narrow distribution of molecular weight.
辽河催化裂化澄清油中芳烃含量高、沥青质含量低、分子量分布窄，是生产针状焦的优质原料，但其所含的灰分对澄清油的加工利用有着较大影响。
The water insoluble precipitate (acetic acid lignin, AcL) had a low weight-average molecular weight range from 341 to 253 (Mw) and a narrow molecular weight distribution from 1.1 to 1.2.
水不溶沉淀物（乙酰化木质素）的重均分子量分布在341到253之间，分散性系数分布在1.1到1.2这一窄范围内。
Styrene-acrylic resin, a typical one among all alkali-soluble resins, has the criteria of low molecular weight, narrow molecular weight distribution, high acid value and low Tg.
在碱溶性树脂中，以低分子量、窄分子量分布、高酸值、较低玻璃化温度的苯乙烯—丙烯酸共聚树脂（简称苯丙树脂）最具代表性。
The polyoxyethylene alkyl phenyl ether obtained by calcium oxide catalyst had perfect quality with narrow molecular weight distribution, high cloud point, good appearance and low by - product PEG.
乙氧基化制得的烷基酚聚氧乙烯醚产品分子量分布窄，浊度高，外观色泽好，副产物聚乙二醇（PEG）低。
The graft copolymer of cationic starch and APAM with narrow molecular weight distribution was prepared and used for dry-strengthening agent.
用阳离子淀粉接枝窄相对分子质量阴离子聚丙烯酰胺制备干增强剂。
The half-metallocene of the elements V, Nb and Ta in VB group could be used in the polymerization of olefin to prepare polymer with rather narrow molecular weight distribution (1.05).
VB族元素钒、铌、钽的单茂金属化合物作为烯烃催化剂可得到分子量分布相当窄（1.05）的聚烯烃；
The aqueous solution properties of poly-dimethyldiallylammonium chloride (PDMDAAC) with different molecular weight(intrinsic viscosity) and narrow distribution were studied in this paper.
本文研究了有系列相对分子质量均聚物PDMDAAC的水溶液性质。
It was found that loop reactor could narrow the molecular weight distribution, increase the content of carbonate in product molecules and improve catalyst efficiency.
研究发现，环流反应器能够使产品分子量分布变窄，提高产品中碳酸酯基团含量及催化剂的催化效率。
According to the present invention, an olefin (co) polymer with a narrow molecular weight distribution is obtained.
根据本发明，得到具有窄分子量分布的烯烃(共)聚合物。
Molecular weight distribution is relatively narrow and the molecular weight is relatively small;
且树皮木质素磺酸盐的分子质量分布相对比较均一，分子量较小；
The molecular weight distribution of polycaprolactones gained were narrow.
聚合产物的分子量分布较窄；
The polymer molecular weight is high, the molecular weight distribution is narrow, and the polymerization method is green and environmental-protection.
本发明具有制得的聚合物分子量高、分子量分布窄，聚合方法绿色环保的优点。
The polymer molecular weight is high, the molecular weight distribution is narrow, and the polymerization method is green and environmental-protection.
本发明具有制得的聚合物分子量高、分子量分布窄，聚合方法绿色环保的优点。
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