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汉语拼音：shuāng jiàn

在化合物分子中两个原子间以共用两对电子而构成的键。通常用两条短线＝”表示。如乙烯(ch2＝ch2)、丙酮(﹉3ccch3o)等分子中的键。[hj]

• Polymerizable quaternary ammonium surfactants are easy to modify the materials through the polymerization reactions.

  因其具有可聚合双键结构，使其易于通过聚合反应对材料进行修饰。

• The organic group further comprises at least one activating group on at least one carbon atom of the C-C single bond or double bond.

  所述有机基团进一步包括至少一个在所述C-C单键或双键的至少一个碳原子上的活性基团。

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

  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。

• Then a hexacyclic-ring system formed as a result of molecular recombination, based on which further dehydrogenation occurred.

  然后经过重排又转变成了一个具有碳碳双键的六员环体系，并在此基础上进一步发生脱氢反应。

• Depending upon reaction conditions, the product may be a polyketone formed by addition polymerization of the ketene double bond.

  随着反应条件的不同，产物可以是由烯酮的双键加成聚合得到的聚酮。

• The invention relates to visible light crosslinking polymer emulsion containing unsaturated double bond and a method for making the same.

  本发明涉及一种可见光交联含不饱和双键的聚合物乳液及其制备方法。

• Therefore, we can clearly see that imine double bond is ond kind of important antibacterial functional group of these compounds.

  因此，可以明确亚胺双键是该类化合物的重要抑菌官能团之一。

• The heat-resistance is improved by the addition of initiator to control the content of double bond.

  通过加入适量的引发剂控制体系的双键含量，可有效提高SBS的耐热性。

• The block copolymer reacted with acryloyl chloride to obtain amphiphilic block copolymers with unsaturated double bonds at the terminal.

  该嵌段共聚物再与丙烯酰氯反应得到末端带有不饱和双键的两亲性嵌段共聚物。