支化度

研究了反应温度对合成的PCS的SiH键含量、支化度、SiSi键含量、分子量及其分布、软化点及产率的影响。

The influence of reaction temperature on the Si H bond content , degree of branching , Si Si bond content , molecular weight and distribution , softening point and yield of the PCS was investigated .

SIS和（SI）nR的（？）分别为（1530）×10~4和（1540）×10~4，后者的支化度为3；

The Mn of SIS and ( SI ) nR were ( 15-30 ) × 104 and ( 15-40 ) × 104 , respectively , and the degree of branching of the latter was 3 ;

用减差红外光谱分峰法测定EVA共聚物的总支化度及支化度分布

Determination of degree of branching and its distribution in EVA by FTIR

首先利用图论方法引进描写分子支化度的αN指数，该指数能分辨仅有微小结构差异的饱和链烃分子，给出支化结构的合理描述。

Using the molecular graph theory , α _N index , which is able to describe the molecular branching , has been proposed .

LDPE分子量及其分布和支化度的测定

Determination of molecular weight , molecular weight distribution and branching degree of LDPE

双检测器GPC研究顺丁橡胶长链支化度

Study on long chain branching in cis-polybutadienes by GPC with double detector combination

产物聚乙烯支化度为17%，13cNMR分析结果表明，含有甲基、丁基和长支链。

13 C NMR analysis reveals there are methyl , butyl and long branches at polyethylene backbone .

其结构用IR表征，相对分子质量及其分布和支化度用GPC测定。

The structure of PVAc was characterized by IR and the relative molecular weight and relative molecular weight distribution were determinated by GPC .

将PEAs膜于50℃NaOH溶液（pH值为11）中降解，随聚合物支化度的增加，降解加快。

As the branching degree of PEAs rises , the degradation of PEAs in the NaOH solution with pH 11 at temperature of 50 ℃ is accelerated .

热压合成后制得的超高分子质量PCS的Si&H含量和支化度有所降低；

Average molecule weight of the as-synthesized PCS was 6 400 to 8 500.Both its ' degree of branching and the content of Si & H decreased .

通过比较PE-b-PEO样品及其均聚物的结晶温度和熔融温度，发现PE链段支化度较高的PE-b-PEO具有更低的PE段结晶温度和熔融温度。

In the PE-b-PEO block copolymers , the PE blocks with more branches have lower crystallization and melting temperatures .

将POE作为接枝机体树脂，利用其支化度比较高、容易形成接枝点来获得较高的接枝率；

In the grafting reaction , the high graft yield is gained when POE is the grafting polymer , by using its structural properties such as higher branched degree and bigger side-chain .

建立了以凝胶渗透色谱（GPC）数据与稀溶液特性粘度数据相结合，测定顺丁橡胶长链支化度的方法。用GPC-[η]法测定氯丁胶的长链支化度

The method for determining long-chain branching of cis-polybutadiene by using a combination of intrinsic viscosity [ η ] - GPC data was discussed . Determination of Long-Chain Branching in Polychloroprene by Gel Permeation Chromatography-Intrinsic Viscosity Method

路径数p1、拓扑指数xz，s1和s2等参量，是表征单烯烃分子大小、支化度、形状和碳双键位置等结构特征的重要参量。

Number of path p 1 , the topological indexes x z , s 1 and s 2 can be used to characterize the size , branching and shape of mono olefins , and site of twofold bond in mono olefin .

该理论可定量描述支化度的多分散效应，并首次描述了聚合物链拓扑结构对超额Helmholtz自由能的贡献。

The theory is able to describe the polydisperse effect of degree of branching quantitatively . The topological contributions of the polymer chains to the Helmholtz free energy take into account the effect of triple connections that are absent in previous DFT theory .

同时采用GPC、FTIR和DSC对级分的摩尔质量、支化度和结晶性能进行了测定和分析，结果表明溶液分级能够将HDPE分成窄摩尔质量分布且具有特定结晶度的级分。

The molecular weight , the content of short chain branching and crystallinity for each fraction were characterized by GPC , FTIR and DSC , respectively . The results confirmed that HDPE could be effectively fractionated into three different fractions with relatively narrow molecular weight distribution and defined crystallinity .

密炼实验结果表明：一定量的均苯四甲酸二酐（PMDA）能够增加R-PET扩链/支化度，从而熔体流动速率减小，结晶温度和熔融温度降低。

Batch mixer experimental results showed that a certain amount of PMDA could increase the chain extension / branching degree of R-PET , which led to the decrease in melt flow rate , crystallization temperature and melting temperature .

实验结果表明，光氧化后聚乙烯的支化度和结晶度都有所增大，亚乙烯基双键浓度逐渐降低，末端乙烯基双键浓度由于NorrishⅡ型反应增强而增大。

The results show that both the branching degree and crystallinity of polyethylenes increase after photo-oxidization . The concentration of vinylidene decreases gradually with the prolongation of irradiation time , while that of end-vinyl increases due to Norrish ⅱ reaction .

超支化聚合物支化度估算方法的修正

Modification of the Estimation Method of Branch Degree of Hyperbranched Polymers

边支化度指数与环烷烃沸点的相关性

Relativity of Edge Branch Index with the Boiling Points of Cycloalkanes

ESO-丙交酯星形聚合物支化度的测定及其缓释性能研究

Study of Degree of Branching and Drug-Releasing Performance for ESO-Lactide Star Polymer

环氧大豆油与丙交酯星形共聚物支化度的表征

Characterization of Degree of Branching for Star-Shaped Polymer of ESO and Lactide

超支化聚醚的支化度对玻璃化转变温度的影响

Effect of Degree of Branching on Glass Transition Temperature for Hyperbranched Polyether

聚乙酸乙烯酯的溶液性质及长链支化度乙二醇-乙醚乙酸酯，[俗]醋酸溶纤剂

SOLUTION PROPERTIES AND LONG CHAIN BRANCHING OF POLYVINYL ACETATE ethylene glycol monoethyl ether acetate

用凝胶渗透色谱测定聚合物中的支化度

Determination of branching in polymers by gel-permeation chromatography

聚合物支化度随分子量的增加而略有增加。

The degree of branching had a slight increase with increase of the molecular weight .

顺丁橡胶长链支化度的表征

Characterization of long-chain branching degree of cis-polybutadiene

用氢核磁共振测得其支化度均小于0.106，用尿素络合法测得正构烷烃含量均大于39.2%。

The normal paraffin contents were more than 39 . 2 % by urea adduction method .

这些超支化聚合物有较好的热稳定性，其分解温度随着支化度的上升而升高。

These highly branched polymers possessed good thermal stability and their decompostion temperatures increased with the increase of branching degrees .

详细分析和讨论了聚合温度和单体浓度对聚合物支化度和支化种类的影响。

The influence of reaction temperature and monomer concentraion on branching degree and branch type were also discussed in detail .