数均分子量

糯玉米淀粉的粘均分子量和数均分子量分别为1.07×10~6、1.84×10~7g/mol，糯玉米支链淀粉的分支度远大于玉米支链淀粉。

The viscosity-average molecular weight and number-average molecular weight of waxy corn starch are 1.07 × 10 ~ 6 and 1.84 × 10 ~ 7 g / mol respectively . The branching degree of the amylopectin of the waxy corn starch is bigger than the corn starch .

VPO法测定EO－THF共聚醚数均分子量的研究

Study on Determination of number-average molecular weight for eo-thf COPOLYETHERS

粗产品数均分子量（Mn）为3420，分子量分布窄。

The average molecular weight ( Mn ) of crude product was 3420 and its molecular weight distribution was narrow .

GPC分析表明共聚物的数均分子量为8.7万。

GPC analysis dis-played that the molecular weight of the copolymer was 87000 .

考察了聚合条件对共聚物数均分子量和醋酸乙酯（VA）质量分数的影响。

Effects of polymerization conditions on the copolymer molecular weight and VA weight content were studied .

GPC测得共聚物的数均分子量为4934，多分散指数是1.978，具有较窄的分子量分布。

The data of GPC indicate that the number-average molecular is 4934 and the polydispersity is 1.978 with a narrow molecular distribution .

当PEG的质量比相同（以10%为例），而数均分子量降低时，结晶度在不断减小。

The crystallinity of copolyesters gradually lowered with the decrease of the molecular weight of PEG when the weight percent of PEG was identical ( such as10 % ) .

用FT-IR、1H-NMR表征了其分子结构，测定了树脂产物的环氧值E和数均分子量及相对分子质量分布；

The structure of epoxy resins were characterized by FT IR and 1H NMR spectra . The epoxy value ( E ), molecular weight distributions of the resins were measured .

分析表明：PCS的数均分子量为400，活性较强，陶瓷化产率为70%左右，在1200℃基本转化为微晶态的-βSiC。

The average molecular weight of active PCS is 400 ( M_n ) . The ceramic yield is approximately 70 % , and PCS was translated into β - SiC crystal at 1200 ℃ .

GPC估计其数均分子量为6×10~4.扭辫分析表明，该聚合物的玻璃化转变温度与粘流温度分别为0℃和130℃，硫化温度为210℃。

The Mn of this polymer estimated by GPC is 6 × 104 and the glass transition and viscous flow temperatures determinated by TBA are 0 ℃ and 130 ℃ respectively .

结果表明，MPEGNH2引发NCA开环聚合得到的是嵌段共聚物，通过1HNMR谱得到共聚物组成及数均分子量；

The results showed that products of NCA ring opening polymerization initiated by MPEG-NH 2 were block copolymers . Their block contents and number-average molecular weights were calculated from 1H-NMR .

在非临界区PBT在溶剂中处于溶胀状态，其数均分子量Mn下降缓慢，解聚程度低；

In the sub-critical region , the degradation reaction primarily occurs on the surface of PBT , which mainly shows as a swelling process , the degree of PBT degradation is low and its numerical average molecular weight Mn decreases slowly .

GPC结果表明，作为光引发剂的Iniferter聚苯乙烯的数均分子量（Mn），体重平均分子量（Mw）和使用分子量分布进行了计算，分别是9201340，和1.46。

GPC results show that the number average molecular weight ( Mn ), weight average molecular weight ( Mw ) and polydispersity of the polystyrene iniferter using as photoinitiator were calculated 920,1340 , and 1.46 , respectively .

非离子型表面活性剂数均分子量的测定

Determination of uniform molecular weight of non - ironic surfactant

乙酰丙酮法测定甲壳胺寡糖数均分子量

Determination of number average molecular mass of chitosan - oligosaccharide by acetylacetone method

腐殖酸的数均分子量测定

The determination of number-average molecular weight of humic acids

醇酸树脂数均分子量与反应程度的关系

Relational Expression of Average Molecular Weight of Alkyd Resin with Degree of Reaction

GB/T6596-1986膜渗透压法测定聚苯乙烯标准样品的数均分子量

Determination of number-average molecular weight of polystyrene standards by membrane osmometry osmotic pressure

与聚合物特性粘度关联，建立其氯仿溶液中特性粘度与数均分子量的关系：〔η〕＝7.77×10－6M0.926n。

Combined with , relationship between and number average molecular weight was established .

乳液聚合产物的分子量与单体转化率呈线形关系，产物的数均分子量比理论分子量大，随着转化率的增加，分子量分布会变宽。

The molecular weight of the polymer product showed a linear relationship with the monomer conversion .

温度升高，聚合反应的转化率增加，但产物的数均分子量及分子量分布无明显变化；

The number-average molecular weight and molecular weight distribution of the polymer were not sensitive to temperature .

黄原胶的数均分子量研究

A Study on Number Average Molecular Weight of Xanthan should be the new synonym of it . The Yellow Paint

最后，比较了理论计算与实际测量的数均分子量与时间的关系。

Finally the relationship of number-average molecular mass to time have been compared by using theoretical calculated and practical measured values .

结果表明核磁共振内标法求聚氧丙烯甘油醚类化合物数均分子量快速，方便，准确。

The results show that It is a high speed , convenient and accurate method as compared with end-group analytical method .

不同聚酯合成的乳液的数均分子量大小次序为：CMA-44-600>T1136>CMA-1044>MX-785>CMA-44。

And the molecular weight of WPU from different molecular weight of polyester as CMA-44-600 > T1136 > CMA-1044 > MX-785 > CMA-44 .

采用乙酰丙酮与氨基端反应的生色原理，将乙酰丙酮法应用于甲壳胺寡糖数均分子量的测定。

To determine the number average molecular mass of chitosan-oligosaccharide by u-sing the acetylacetone 's method based on the color-producing reaction with amino terminal .

环氧丙烷开环聚合反应的工程研究（Ⅱ）间歇和半连续操作时聚醚的数均分子量和双键度

Investigation of ring opening polymerization of propylene oxide (ⅱ) average molecular weight and degree of unsaturation of polyols under batch and semicontinuous operating conditions

所得聚合物的数均分子量随单体转化率的增加而线性增长，而且分子量呈单峰分布。

The number averaged molecular weights of the obtained polymers increased linearly with monomer conversion , and molecular weight distributions were unimodal throughout the reaction .

反应过程中有明显的活性聚合特征，其转化率-时间曲线和数均分子量-转化率曲线呈现较好的线性关系。

The process of reaction has an obvious characteristic of living polymerization , and the convertion-time plots and the molecular weight-convertion plots are well linear correlated .

实验结果表明，提高干燥温度，如从室温提高到55℃，由于发生部分α链降解，明胶数均分子量下降；

The results indicate that if the drying temperature increases to 55 ℃ from the room temperature , a part of α components decomposes , the Mn decreases .