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先驱
相关语句
  a precursor
    The TiO_2 sol is prepared through Sol-Gel method, Ti(OC_4H_9)4 is chosen as a precursor, and ethanol as impregnant,HCl as catalyzer.
    实验以钛酸丁酯为先驱体,乙醇为溶剂,盐酸为催化剂,以溶胶-凝胶法制备TiO_2溶胶。
短句来源
    Polycarbosilane (PCS) is used as a precursor to prepare SiC fibers and ceramic matrix composites. The structure and the properties of PCS directly affect the subsequent preparation as well as the quality of the final products.
    聚碳硅烷(PCS)先驱体是制备SiC纤维及陶瓷基复合材料的原料,它的组成、结构和性能直接影响后续制备工艺以及最终产品的质量。
短句来源
    Threedimensional carbon fiber reinforced silicon oxycarbide composites (3DB Cf/SiOC) were fabricated via precursor infiltration and pyrolysis using DVB/PSO as a precursor.
    以质量比为0.5的DVB/PSO体系为先驱体,采用先驱体转化法制备出三维Cf/Si-O-C复合材料。
短句来源
    Polycarbosilance(PC P) is a precursor for silicon carbide(SiC) fiber with good mechanical properties and low specific resistance.
    聚碳硅烷PC—P是制备力学性能优异的低电阻率碳化硅纤维的先驱体。
短句来源
  “先驱”译为未确定词的双语例句
    Fabrication of Ordered Porous Non-Oxide Ceramics Using Preceramic Polymer/Template Techniques
    先驱体高分子/模板技术制备有序多孔非氧化物陶瓷
短句来源
    SYNTHESIS OF PRECURSORS OF SiC FIBERS CONTAINING Ti
    含Ti的SiC纤维的先驱体的合成
短句来源
    SYNTHESIS OF PRECURSORS PTC-Ⅲ OF SiC FIBERS CONTAINING Ti
    含Ti的SiC纤维先驱体PTC—Ⅲ的合成
短句来源
    When volume percentage of C/CF perform bars made of 1k and 3k carbon fiber is 25% and 44.7%,the tensile strength of C/CF/Cu composite material is higher and reaches up to 595 MPa and 587 MPa,respectively,which is equivalent to more than three times of that of pure copper cast with 28.5 MPa squeeze pressure.
    当凝固成型压力为28.5MPa时,1k碳纤维丝的C/CF先驱丝体积分数为25%和3k碳纤维丝的C/CF先驱丝体积分数为44.7%的复合材料的抗拉强度达到较高值,分别为595MPa和587MPa,均为纯铜抗拉强度的3倍以上。
短句来源
    Higher volume percentage of carbon fibers in C/CF perform bars made of 3k carbon fiber affects interface strength of C/CF/Cu composite material,but 1k carbon fiber is more beneficial to that.
    3k丝制成的一次C/CF先驱丝内碳纤维丝的数量较多,影响复合材料的界面强度,而选用1k碳纤维丝比较有利。
短句来源
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  a precursor
Isolated endophyte (Neurospora crassa) producing camptothecin may become an easily accessible source for the production of a precursor anticancer drug molecule in the future at a large scale.
      
We have cloned the gene encoding a precursor of mistletoe (Viscum album) toxin MLIII.
      
Anabasine as a precursor for the synthesis of potential agonists of neuronal acetylcholine receptors
      
It is known that a precursor is formed ahead of the wave front when a shock wave interacts with a hot thin surface layer.
      
It was suggested that the uracil-N(3)-yl radical can be a precursor of strand breaks in poly(uridylic acid).
      
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By the reaction between polycarbosilane and tetrabutoxititanium,polytitanocarbosilane PTC-Ⅰ containing Ti(atom ratio Ti/Si=0.02—0.04)weresynthesized.The spinnability and the melting point of PTC-Ⅰ are changed regularly withincreasing the content of Ti.By the reaction between diphenylsilanediol andtetrabutoxititanium,a oligomer of polytitansiloxane was obtained.Polymer PTC-Ⅱ con-taining higher Ti content(atom ratio Ti/Si=0.10)was synthesized by the reaction be-tween polycarbosilane and polytitansiloxane.SiC fibers...

By the reaction between polycarbosilane and tetrabutoxititanium,polytitanocarbosilane PTC-Ⅰ containing Ti(atom ratio Ti/Si=0.02—0.04)weresynthesized.The spinnability and the melting point of PTC-Ⅰ are changed regularly withincreasing the content of Ti.By the reaction between diphenylsilanediol andtetrabutoxititanium,a oligomer of polytitansiloxane was obtained.Polymer PTC-Ⅱ con-taining higher Ti content(atom ratio Ti/Si=0.10)was synthesized by the reaction be-tween polycarbosilane and polytitansiloxane.SiC fibers containing Ti have been obtainedfrom PTC-Ⅰ and PTC-Ⅱ having good spinnability as their precursors.

通过聚碳硅烷与钛酸丁酯的反应,合成了含钛聚碳硅烷 PTC-Ⅰ(Ti/Si 原子比=0.02—0.04)。PTC-Ⅰ的可纺性与熔点随 Ti 含量增加而有规律地变化。由二苯基硅二醇与钛酸丁酯的反应,可制得低聚体的聚钛硅氧烷,将其与聚碳硅烷反应,可以合成具有更高 Ti 含量的聚合物PTC-Ⅱ(Ti/Si 原子比=0.10)。PTC-Ⅰ与 PTC-Ⅱ都具有良好的可纺性,以它们作为先驱体制得了含 Ti 的 SiC 纤维。

Polytitanocarbosilane(PTC),the precursors of SiC fibers containing Ti,was synthesized by the reaction between polycarbosilane(PC)and tetrabu-toxititanium(Ti(OBu)_4).The structure and properties of PTC dependdirectly on the molar ratio of Ti(OBu)_4/PC.The spinnability and themelting point of PTC change regularly with this ratio.It is attributed tothe formation of the crosslinked structure by —Ti—O— as bridge groupand the pendant structure by—Ti(OBu)_3 as side group.The relationbetween structure and properties...

Polytitanocarbosilane(PTC),the precursors of SiC fibers containing Ti,was synthesized by the reaction between polycarbosilane(PC)and tetrabu-toxititanium(Ti(OBu)_4).The structure and properties of PTC dependdirectly on the molar ratio of Ti(OBu)_4/PC.The spinnability and themelting point of PTC change regularly with this ratio.It is attributed tothe formation of the crosslinked structure by —Ti—O— as bridge groupand the pendant structure by—Ti(OBu)_3 as side group.The relationbetween structure and properties of PTC has been studied in this paper.SiC fiber containing Ti has been obtained from PTC-0.02 and PTC-0.04with good spinnability as their precursors.

通过聚碳硅烷与四丁氧基钛的反应。可以制得含钛碳化硅纤维的先驱体聚钛碳硅烷。反应物配比(Ti(OBu)_4)/PC 将直接影响产物的结构与性能。随这一比例的增加,聚钛碳硅烷的可纺性与熔点将有规律地变化。这可归因于以—Ti—O—为桥的交联结构和以—Ti(OBu)_3为侧基的悬挂结构的形成。本文研究了聚钛碳硅烷的结构与性能的关系,并以具有良好成丝性的PTC-0.02与PTC-0.04为先驱体,制得了含钛碳化硅纤维。

Polytitanocarbosilane(PTC),the precursor of SiC fiber containing Ti,has been synthesized directly from polysilane(PS)and titanium tetrabu-toxide(Ti(OBu)_4)without using any reaction promoter.In this reaction,PS was decomposed into polysilane of low molecular weight(LPS)containing Si—C skeleton and Si—H bonds.Then PTC was obtained by thereaction of Si—H bonds in LPS with Ti(OBu)_4 accompanied by theconversion of Si—Si skeleton in LPS into Si—C skeleton.In this paper,the synthesis process and structure of PTC-Ⅱ...

Polytitanocarbosilane(PTC),the precursor of SiC fiber containing Ti,has been synthesized directly from polysilane(PS)and titanium tetrabu-toxide(Ti(OBu)_4)without using any reaction promoter.In this reaction,PS was decomposed into polysilane of low molecular weight(LPS)containing Si—C skeleton and Si—H bonds.Then PTC was obtained by thereaction of Si—H bonds in LPS with Ti(OBu)_4 accompanied by theconversion of Si—Si skeleton in LPS into Si—C skeleton.In this paper,the synthesis process and structure of PTC-Ⅱ prepared by this newmethod,compared with PTC-Ⅰ obtained by old method,and the proper-ties of SiC fiber containing Ti using PTC-Ⅱ as the precursor wereexamined and discussed.

从聚硅烷(PS)与钛酸丁酯。(Ti(OBu)_4)出发,不采用任何反应促进剂直接合成了含钛碳化硅纤维的先驱体聚钛碳硅烷(PTC)。在这一反应中,PS 首先裂解成含Si—C 骨架与Si—H 键的低分子聚硅烷(LPS)。然后,由LPS 中的Si—H 键与Ti(OBu)_4的反应以及LPS 的Si—Si 骨架裂解转化为Si—C 骨架的反应制得了PTC.本文对这种新合成法所涉及的反应过程进行了研究,并比较了新旧两法得到的PTC—1与PTC—Ⅱ的结构异同,报告了以新法制得的PTC—Ⅱ为先驱体得到的含钛碳化硅纤维的优良性能。

 
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