Three noncyclic acetal-linked cleavable surfactants were prepared based on the optimum condition by condensation of para formaldehyde with polyethers O-9, O-15, O-20. The yield was 88.6%, 81%, 75%, respectively and the structure was determined by NMR.

  • 采用最佳工艺条件合成了O-9、O-15、O-20缩甲醛三种分子量较大的缩醛型聚醚,产率分别为88.6%、81.9%、75%。
  • 来源:互联网摘选更新时间:2025-01-20 17:52:23

  • 重点词汇
  • determinedadj.决心;决定;坚定的;
  • andconj. 和,与;而且;于是,然后;因此;
  • withprep. 具有;和;用;有;以;跟;同;带有;使用;和…在一起;借;与…对立;关于;包括;因为;由于;与…方向一致;由…持有;为…工作;虽然;作为…的成员,为…所雇用;具有,有,带有;在…身上,在…身边;由于,因;在…那里,在…看来
  • theart.这个;指已提到或易领会到的人或事物;指独一无二的、正常的或不言而喻的人或事物;用以泛指;与形容词连用,指事物或统称的人;用于姓氏的复数形式前,指家庭或夫妇;(指特定用途的事物)足够,恰好;每,一;当前的,本,此;(重读,表示所指的为知名或重要的人或事物)
  • were be的过去时复数和第二人称单数形式;有时代替 was,用于条件从句、动词 wish 之后等;
  • based on基于;以……为基础
  • conditionn.状况;环境,处境;条件,条款;健康状况;疾病;
  • threenum.三;三个;第三(章,页等);
  • cleavableadj.劈得开的;
  • byprep. 在…旁边;表示方式;由于;经过;到…之前;
  • condensationn.凝结的水珠;(气体)冷凝;简缩(书);
  • yieldv.产生;屈服,让步;放弃;让路;
  • 相关例句
1、

Synthesis, characterization and near-Infrared luminescence of rare earth complexes with a noncyclic crown-type Schiff base

开链冠醚Schiff碱-稀土配合物的合成、表征及近红外发光光谱研究

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2、

Frontier orbital energies on noncyclic conjugated systems

非环共轭体系的前线轨道能量

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3、

Synthesis of noncyclic crown ethers with 1 phenyl 3 benzoyl thiocarbamide as terminal groups(ⅱ)

含有1-苯基-3-苯甲酰基硫脲端基的开链冠醚的合成(Ⅱ)

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4、

It is the same today that it always was and will never change.

它始终不渝,过去如此,现在如此,将来也永远不变.

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5、

It is the same today that it always was, and it will never change.

它始终不渝,过去如此,现在仍然如此, 将来也永远不变.

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6、

That said, we have always tried to keep the placement based in realism within the environment.

总言之, 我们将始终不渝的把真实的建筑融于环境.

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7、

His loyalty to his faith deserves our respects.

他对自己的信念始终不渝,令人敬佩.

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8、

We are committed to pursuing a win-win strategy of opening-up.

我们始终不渝奉行互利共赢的开放战略.

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9、

ZCIG will never change the faith of pursuing excellence and creating classics.

ZCIG人始终不渝追求卓越,创造经典.

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10、

We are all but kids at heart aren't we?

我们都怀抱著赤子之心不是 吗 ?

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11、

He is the most ridiculous bookstore owner, all day long disheveled, a bookstore is Lalilata.

他是世界上最荒唐的书店店主, 成天衣冠不整, 书店里也是邋里邋遢.

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12、

Just look at yourself; you're a complete mess.

看你这身上下, 邋里邋遢!

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13、

I wouldn't want to be that old. An old man is a nasty thing.

我可不想活到这么老. 老年人,邋里邋遢,讨人嫌.

词典精选例句

14、

Yes this solemn teaching building, spacious and clean, bright and clean classrooms ladder?

是这庄重的教学楼 、 宽敞整洁 、 窗明几净的阶梯教室?

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15、

Mine build and looked bright and clean office building, watching the apartment spotless, we are charmed.

矿区建设好了,望着窗明几净的办公楼, 望着一尘不染的公寓, 我们神往.

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16、

Every classroom in our school is bright and clean and takes on a new look.

学校里每间教室都窗明几净,焕然一新.

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17、

The diner was small, but bright and clean . Brand-new, built to resemble a converted railroad car.

这间餐厅虽小, 但窗明几净, 是新盖好的,故意搞得像是一节改造的火车车厢.

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18、

Even after her death, the effect remained and became even firmer as time goes by.

甚至在她逝去后, 影响历久弥坚,十亿个掌声依然如故.

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19、

Thirty years later, the focus has changed but the urgency remains the same.

30年以后, 关注点变化了但是环境保护的紧迫性依然如故.

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20、

The ivy leaf was still there.

那片常青藤叶子依然如故.

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