长支链

长支链结构增大了分子折叠链自由能，在结晶形成过程中，分子链更不容易折叠回到片晶中排列，因而长支化结构促进了γ晶的形成。

LCB structure increases the chain folding energy and makes molecular chain fold back more hardly , so it will facilitate the formation of γ crystal .

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 .

研究结果表明，将长支链引入线性PP中会显著改变PP流变行为，导致PP熔体显示出更长的松弛行为。

The results showed that the long branch chain could change the rheological behavior of the samples evidently and result in a longer relaxation process .

~（13）C-NMR研究聚丁二烯长支链支化

Study of long-chain branching in polybutadiene by ~ ( 13 ) c-nmr spectrometry

通过辐照法制备了长支链型高熔体强度聚丙烯（LCB-HMSPP），采用高级流变扩展系统（ARES）表征了其熔体黏弹性，采用毛细管流变仪研究了其在高剪切速率下的流变行为。

High-melt-strength polypropylene with long chain branching ( LCB-HMSPP ) was prepared via irradiation .

发现13cNMR谱和DRI指数在一定程度上一致反映了mPEs的长支链结构；

The results showed that to some extent , 13C NMR spectra were in accord with the values of DRI for characterizing the long branching level in mPEs .

实验结果显示，随枝化链含量上升，LCBPP结晶行为对流场的响应变得更加敏感，长支链的引入加速了PP成核动力学。

The results showed that the LCB PP samples became more and more sensitive to the flow fields with the content of the branched component increasing ; moreover , long branched chains also accelerated the nucleation kinetic of polymer samples .

但当mPEs中存在的少量长支链时，mPEs的流变性能受其影响很大，导致了DRI指数与13cNMR谱结果差异，以至影响了DRI指数的应用范围。

However , fewer long branching level had great effect on the rheological behavior of mPEs so as to result in differences between 13C NMR spectra and the values of DRI .

与PHB/CAB共混物相比，由于PEG长支链的引入，PHB/CAB-g-PEG共混体系具有更好的相容性，因此韧性明显提高，拉伸时呈现出韧性断裂的特征。

Unlike PHB / CAB blends , PHB / CAB-g-PEG blends were miscible system because of the introduction of PEG long side chain . So the toughness of these blends was much better than PHB / CABblends and showed obvious characteristic of tenacity fracture .

13C核磁共振谱分析结果表明，催化剂体系Ⅰ制备的聚乙烯产物的支链全部为长支链（支链碳原子数大于等于6），而催化剂体系Ⅱ制备的聚乙烯则含有长支链和侧甲基；

~ ( 13 ) C NMR indicated that branched chain polyethylene with long chain branch es ( carbon number more than 6 ) was only synthesized on Cat ⅰ, while polyethylene with methyl pendants and long chain branch was prepared over Cat ⅱ .

辐照改性制备长支链型高熔体强度聚丙烯（LCB-HMSPP）流变行为及挤出发泡的研究

Research on High-Melt-Strength Polypropylene with Long-Chain-Branching Structure ( LCB-HMSPP ) Prepared by ~( 60 ) Co - γ Irradiation : Rheological Properties and Applications in Extrusion Foaming

长支链结构对等规聚丙烯结晶行为的影响

Effect of long chain branched structure for isotactic polypropylene on crystallization behaviors

天然纤维素蒸汽闪爆改性对其长支链酯合成影响

Effect of Steam Explosion on Synthesizing Long Chain Cellulose Ester

长支链型高熔体强度聚丙烯流变性能的研究&剪切流变

Rheological Behavior of High-melt-strength Polypropylene with Long-chain-branching Structure-Shear Rheology

长支链聚丙烯的制备与表征

Synthesis and Characterization of Long Chain Branched Polypropylene

研究表明：成功合成了具有长支链和梳型结构特点的两性聚丙烯酰胺。

The study showed that the as prepared PAM had long branched chain and comb structure .

但是对于梳形聚合物与不对称星形聚合物来说，在一定范围内单凭线性粘弹性是难以进行区分的，这表明线性流变学在表征长支链聚合物时是存在局限的。

However , it is difficult to distinguish the asymmetric star and comb polymers only by the linear viscoelasticity .

在苯乙烯存在下只需较低的引发剂用量，经历一定的反应时间就有长支链形成。

It was also found that long chain branches can be formed at rather low initiator feed in the presence of styrene .

随着温度的升高聚乙烯产物支化度和甲基支链含量都迅速增加，长支链含量则显著下降。

Branching degree of the polyethylenes and the content of methyl branch rise quickly with reaction temperature , but the content of long branches drops remarkably .

而由Ni+Mo催化体系聚合的试样，可能为1,2-乙烯基的双键打开接长支链。

For samples polymerized from Ni + Mo catalysts systems , branching point is formed through the opening of the double bond of 1,2 vinyl group .

反应温度、引发剂用量、单体用量以及反应时间等因素对长支链的形成也有影响。

The formation of long chain branches was affected by factors such as reaction temperature , feed ratio of initiator , styrene feed and reaction time .

茂金属聚乙烯的分子链长支化结构对其流变特性有重要影响，长支链可以使熔体弹性和剪切变稀效应明显增强。

The molecular long chain branch structure of metallocene polyethylene has great effects on it 's rheological behavior , long chain branch can significantly enhance melt elasticity and shear thinning .

双烷基过氧化物在短支链助交联剂的配合下，使乙丙二元共聚丙烯和长支链的乙-辛烯共聚物产生网状交联结构。

Crosslinked network structure of COPP and POES with long branched chain was formed by the combination effect of double alkyl peroxide and auxiliary crosslinking agent with short branched chain .

分析了聚合物的结构因素包括熔体流动速率、长支链、共聚单体和相对分子质量分布以及测试条件包括温度、挤出速率和拉伸长度对熔体强度的影响。

Some factors affecting melt strength are analysed such as polymer structure factors including melt index , long chain branching , comonomer type and molecular weight distribution and measuring conditions incorporating temperature , extrusion rate and draw distance .

产物具备长支链聚合物的一般特征，流变行为得到了大大改善，如低频剪切储存模量增加、损耗角变小、复数粘度增大、剪切变稀程度降低等。

The products possessed the general characteristics of long chain-branched polymer and the rheological behavior has been obviously improved , such as higher value of stored module at low frequency , distinct decrease of loss angle , significant increase of complex viscosities and shear thinning less sensitive .

选用局部坐标系和球铰的转角描述了动平台的位置，分析了运动副转角、杆长、支链干涉等因素对并联机器人工作空间的影响。

By adopting the partial coordinates system and the turning angle of globe hinge the position of moving platform was described , and the influence on working space of parallel robot affected by factors of turning angle of motion pair , rod length and interference of branch chain etc.

双突变还降低了短（聚合度（DP）5-6）和长（DP12-23）支链淀粉链的含量、增加了中长型（DP7-11）支链淀粉的含量。

The double mutation also reduced short ( degree of polymerization ( DP ) 5 – 6 ) and long ( DP12 – 23 ) amylopectin chain contents in the grain and increased the medium long types ( DP7 – 11 ) .

氨基磺酸系减水剂的长主链、多支链、多极性基团的分子结构特点决定其在水泥颗粒表面的吸附特性。

The adsorption characteristic on the surface of cement particals can be attributed to the molecule structure of ASPF .

对于配比为80／20的线形聚丙烯／长链支化聚丙烯共混物，由于长支链的存在，降温速率越慢，结晶温度越高。

For the blend that the mass rate of linear polypropylene / long chain branching polypropylene is 80:20 , its crystallization temperature goes up with a reduction in cooling rate because of the presence of long chain branding polypropylene .