双键

FUZZY法用于化合物的双键位置及活性预测

A fuzzy method for prediction of double bond position and activity

双环和多环化合物中双键~（13）cNMR化学位移计算

The calculation of double bond ~ ( 13 ) C NMR chemical shift in bicyclic and polycyclic compounds

“蜡是一种复杂的混合物，但其内部也存在聚乙烯中的基本键——碳碳双键，”她解释道，“而蜡螟蠕虫进化出了一种方法或系统来破坏这种键。”

＂ Wax is a complex mixture , but the basic bond in polyethylene , the carbon-carbon bond , is there as well , ＂ she explains , ＂ The wax worm evolved a method or system to break this bond ．＂

辅酶NAD（P）H模型还原碳-碳双键化合物反应机理研究

On the Mechanism of Reduction of Ethylenic Compounds by NADH Models

胺草磷分子中的磷原子形成四个四面体向的化学键，其中P&S键含有相当高的双键成分，这意味着磷原子的3d轨函参与成键。

It implies that the empty 3d-orbital of the phosphorus atom should be involved in the chemical bond formation .

在这种情况下，我们在，A，与，B，之间有一个双键，而在这种情况下，双键在，B，与，C，之间。

In this case we have a double bond between a and b , and in this case we have it between b and c.

用FTIR证实了剩余双键。

The double bond residue was obtained by the use of FTIR .

同样在B环上具有邻位羟基的条件下，C环的2,3位为双键结构时，清除自由基的作用增强；

And C ring with C2-C3 double bond could enhance its effect in scavenging free radical on condition that B ring had the adjacent hydroxyl .

与二烯烃橡胶相比，EPDM的双键很少。

Compared with diolefine rubber , EPDM has less double bond .

碳-碳双键修饰纳米SiO2及其摩擦学性能

Surface-modification of Silica Nanoparticles by Carbon-carbon Double Bonds and Its Tribological Properties

以Ni及Co催化体系聚合的试样，支化点可能位于顺-1,4主链双键的α-次甲基上；

For samples polymerized from Ni and Co catalysts systems the branching point is on the a-methylene group of the Cis-1,4 double bond .

分子筛催化cis-2-丁烯的双键异构反应机理的DFT研究

DFT Study on the Double Bond Rearrangement Mechanism of cis-2-Butene Catalyzed by 3T Cluster Model of Zeolite

合成了苯乙烯与丁二烯及含CC双键硅烷的嵌段共聚偶联剂。

A series of ternary copolymers of styrene , butadiene and silane coupling agent containing CC bond were synthesized .

本合成工作的关键为9,15环丙基的形成及在重建GA骨架时A环中双键的重排反应。

The key reactions included the formation of 9,15-cyclopropyl function and double bond migration in the A ring to reestablish the GA skeleton .

C（60）是高度共轭的笼状结构的碳素体，分子结构中六边形环间的共价碳碳双键是富电子区，反应性能与烯烃有类似性，主要表现为双键加成。

C_ ( 60 ) is one kind of fullerene with high conjugated cage-types structure . Its covalence between two hexagons has high reactivity , which behaves as addition reaction of double bond .

PPV中双键顺反异构过程及衍生的物理性质变化

Cis-trans Isomerization of Vinylenes in PPVs and the Subsequent Change of Physical Properties

合成了主链重复结构单元中含不饱和双键的聚磷酸酯，利用FT-IR及NMR对其进行了表征。

Unsaturated polyphosphoester ( UPPE ) containing unsaturated olefinic bonds in repeat units was synthesized and characterized by FT-IR and NMR .

通过溴化法对PDA中总残余双键进行测定，对分析过程中反应温度、时间和pH值进行了研究。

Residue double bonds in PDA were determined by bromating method , and the effect of reaction temperature , time and pH value were explored .

在相同反应温度下，SBS中丁二烯段不同结构的双键的反应活性递减顺序为：顺－1，4，反－1，4，1，2－结构。

The decreasing order of reactivity for double bonds at the same reactive temperature was as follows : cis-1,4 , trans-1,4,1,2-unit .

采用layerbylayer（LBL）的方法，将基板依次在具有光敏双键的季铵盐水溶液和聚乙烯基苯磺酸钠水溶液中浸泡，石英基板表面形成了自组装多层沉积膜。

By using layer-by-layer method , photosensitive self-assembled multilayer film on quartz substrate was prepared in aqueous solution of cationic amphiphile and poly ( sodium 4-styrenesulfonate ) .

共轭亚油酸（conjugatedlinoleicacid，CLA）是一组位置和几何异构体的十八碳共轭二烯酸的统称。其双键位于7,9；

Conjugated linoleic acids ( CLA ) refer to a collection of positional and geometric isomers of octadecadienoic acid with conjugated double bonds .

单不饱和脂肪酸（MUFA）是脂肪酸的一种，其碳链上只有一个双键。

Monounsaturated fatty acid ( MUFA ) is a sort of fatty acids , including a double bond in its carbon chain .

将含有C1末端双键的膦酸二烷基酯直接用于WittigHorner反应。

C 1 double bond phosphonate is used in Wittig-Horner reaction directly .

利用SBS中丁二烯软段中的双键进行环氧化反应，引入环氧基团进行化学改性。

The double bonds of the butadiene soft matrix in SBS were epoxidized in order to incorprate the epoxy groups and modify chemically .

用FTIR跟踪监测环氧丙烯酸酯胶粘剂光固化过程并研究了光引发剂体系中辐射时间与双键转化率的关系。

The paper used FTIR to monitor the curing progress and studied the effects of photoinitiators on the relationship of exposure time and conversion .

但一旦你有了双键，我们有π键，也有sigma键。

But once you have a double bond here , we have our pi bond , as well as our sigma bond .

产物的NMR分析证明所合成产物分子中降冰片烯环上双键未参与聚合反应。

NMR characterization of the synthesized products shows that the double bond in the norbornene rig of the product polymers is not affected by the ATRP conducted .

共轭亚油酸（conjugatedlinoleicacid，CLA）是含有共轭双键的不饱和脂肪酸，有多种几何异构体和位置异构体。

Conjugated linoleic acid ( CLA ) which is unsaturated fatty acid includes conjugated double bonds and has many kinds of geometrical isomers and positional isomers .

综述氰酸酯树脂（CE）的种类及热固性树脂、热塑性树脂、橡胶弹性体、含不饱和双键化合物等对CE树脂的改性。

The type of cyanate ester resin ( CE ) and its modification by thermosetting , thermoplastics , rubber elastomer and unsaturated compound with double bond are reviewed .

两个环外PS双键处于含磷杂环的同一侧，表明2b分子是一个cis结构。

The two PS double bonds are located in the same side of hetero ring , indicating clearly that 2b is a cis isomer .