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polymerization     
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  聚合
     The Study on Polyolefin Nano-composites and New Type Catalysts for Olefin Polymerization
     聚烯烃纳米复合材料及新型烯烃聚合催化剂的研究
短句来源
     Synthesis of Novel Non-Bridged Metallocene Catalysts and Study on Olefin Polymerization
     新型非桥联茂金属催化剂的合成及其烯烃聚合研究
短句来源
     Syndiotactic Polymerization of Styrene with Homogeneous Metallocene Catalysts
     均相茂金属体系催化苯乙烯间规聚合过程研究
短句来源
     Study on Preparation, Characterization and Properties of Polyazomethine/nylon-6 Composites by In-situ Polymerization
     聚甲亚胺/尼龙6原位聚合复合材料制备、表征与性能研究
短句来源
     Complex-catalyzed Polymerization of Water-soluble Monomers
     水溶性单体的络合催化聚合
短句来源
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  聚合反应
     Study on Hetero-Phase Grafting Polymerization of Vinyl Acetate (VAC), Maleic Anhydride (MAH) and VAC/MAH Binary Monomer System
     醋酸乙烯酯(VAC)、马来酸酐(MAH)及VAC/MAH体系非均相接枝聚合反应的研究
短句来源
     Study on Transparent Composite Material of Polystyrene by the Core-Shell Emulsion and Suspension In-Situ Polymerization
     乳液——悬浮原位聚合反应制备透明聚苯乙烯复合材料的研究
短句来源
     Three-Stage Polymerization Model for Free Radical Polymerization and Experimental Studies on the Polymerization of Potassium Acrylate
     自由基本体聚合反应的三段聚合模型与丙烯酸盐聚合实验研究
短句来源
     Studies on Synthesis, Characterization and Catalysis for Olefin Polymerization of Novel Metallocene Catalysts
     新型茂金属催化剂的合成、表征及催化烯烃聚合反应研究
短句来源
     STUDIES ON CYCLOPOLYMERIZATION--TEMPERATURE EFFECT ON THE POLYMERIZATION MECHANISM OF METHACRYLIC ANHYDRIDE
     环化聚合的研究——聚合温度对甲基丙烯酸酐聚合反应机构的影响
短句来源
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  聚合的
     Supported Metallocene Catalysts and Their Performance in Catalytic Propylene Polymerization
     负载化茂金属催化剂及催化丙烯聚合的研究
短句来源
     Studies on Olefin Polymerization Catalyzed by Metallocene/Cocatalyst (Containing Boron Compound) Catalytic System
     茂金属/含硼化合物催化体系催化烯烃聚合的研究
短句来源
     The Effects of Intracellular Ca~(2+) and Some Kinases on the Activation of NADPH Oxidase and Actin Polymerization in fMLP-induced HL-60 Cells
     FMLP刺激的HL-60中[Ca~(2+)]i和某些激酶对NADPH氧化酶激活和肌动蛋白聚合的作用
短句来源
     Fourier Transform Infrared Spectroscopic Study of Polymerization of Dental Composite Resins
     牙用复合树脂聚合的傅立叶变换红外光谱研究
短句来源
     STRUCTURE AND FUNCTION OF CHLOROPLAST MEMBRANES Ⅷ. EFFECT OF MAGNESIUM IONS ON THE POLYMERIZATION OF CHLOROPHYLL-PROTEIN COMPLEXES OF CHLOROPLAST MEMBRANES
     叶绿体膜的结构与功能 Ⅷ.镁离子对叶绿体类囊体膜的叶绿素-蛋白复合体聚合的影响
短句来源
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  共聚
     GRAFT POLYMERIZATION OF ACRYLONITRILE AND AMPS ONTO STARCH INITIATED BY [Mn(H_2P_2O_7)_3]~(3-)
     [Mn(H_2P_2O_7)_3]~(3-)引发淀粉与丙烯腈和AMPS接枝共聚
短句来源
     GRAFT POLYMERIZATION OF OLEFIN ONTO STARCH USING CS_2/H_2O_2 AS INITIATOR
     淀粉在CS_2/H_2O_2体系中与烯烃接枝共聚
短句来源
     Research on MgCl_2/SiO_2 Complex Support Catalyst Used in Propylene Polymerization and Multistage Polymerization
     MgCl_2/SiO_2复合载体催化剂用于丙烯均聚及多相共聚的研究
短句来源
     The AN-MA-IA ternary copolymerization in HNO_3 solvent system with (NH_4)_2S_2O_8CH_3COCH_2COCH_3-Fe(NO_3)_3 redox system used as initiator is studied in this paper. On the basis of reaction kinetics experiments, the polymerization mechanism is analysed in detail.
     对于硝酸(HNO_3)溶剂中以过硫酸铵—乙酰基丙酮—硝酸高铁[(NH_4)_2S_2O_8—CH_3COCH_2COCH_3-Fe(NO_3)_3]氧化还原体系为引发剂的丙烯腈—丙烯酸甲脂—甲叉丁二酸[AN-MA-IA]的三元共聚反应进行了研究。
短句来源
     Then the SBS-Br was used as a macroinitiator to initiate the graft polymerization of MMA in the presence of CuX/bpy,X was Cl or Br(-Br∶CuX∶bpy=1∶1∶3).
     然后以此SBS-Br为大分子引发剂在CuX/bpy(X=Cl,Br;-Br∶CuX∶bpy=1∶1∶3)存在下引发MMA进行接枝共聚
短句来源
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  polymerization
A training set consisting of 23 compounds was selected to generate these hypotheses, and their activities were evaluated for haem polymerization inhibition and against chloroquine-sensitive (3D7) as well as chloroquine-resistant (K1) strains of p.
      
Hyperbranched poly(aryl ether ketone)s were prepared by polymerization of hydroquinone (A2) and 1,3,5-tris[4-(4-fluorobenzoyl)phenoxy]benzene (B3).
      
Design and synthesis of structurally well-defined functional polypropylenes via transition metal-mediated olefin polymerization
      
This paper summarizes our recent effort to access structurally well-defined functional polypropylenes via transition metal-mediated olefin polymerization.
      
(2) Simultaneous in-situ polymerization of monomers and self-assembly of the polymers.
      
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The molecular weight distribution in two samples of polycaprolactam was deter- mined by fractional precipitation of the polymer from a 1% solution in formic acid (85%) at 25℃, using water as precipitant. The number average molecular weights were deter- mined by titrating carboxyl end-groups of the polymer in benzyl alcohol at 175℃ by 0.05 N KOH in methanol-benzyl alcohol. The differential number distribution curve for both samples shows a very sharp peak and a group of low polymers of wide molecular weight distribution....

The molecular weight distribution in two samples of polycaprolactam was deter- mined by fractional precipitation of the polymer from a 1% solution in formic acid (85%) at 25℃, using water as precipitant. The number average molecular weights were deter- mined by titrating carboxyl end-groups of the polymer in benzyl alcohol at 175℃ by 0.05 N KOH in methanol-benzyl alcohol. The differential number distribution curve for both samples shows a very sharp peak and a group of low polymers of wide molecular weight distribution. Consequently, a single determination of (?) of the polymer can not reveal the actual state of polymerization of the polymer sample. The very sharp peak in the number distribution curve obtained is not in accord with Flory's theory, and the curve is much sharper than a Poisson distribution proposed by Korschak and others, or the distribution function, considering step reaction mechanism alone.

(1)用1%聚已內醯胺在85%甲酸溶液裏加水分級沉澱的方法,测定了兩個聚己內醯胺試樣的分子量分佈曲線。結果都顯示有一極爲狹窄的高峯,和一羣分佈極寬的分子量較低的部分。所以單就試樣的數均分子量,是不足以了解聚合物的聚合情况的。 (2)介紹了聚己內醯胺的羧基滴定的方法。 (3)為了更好地了解己內醯胺的聚合機構,聚合條件和加熱時間對聚合物分子量分佈的影響,值得作進一步的研究。

A method of the determination of the precipitability of polycaprolactam was established, using phenol-alcohol-water (volume ratio 2∶1∶1) as the solvent and acetone as the precipitant. 0.2 g of the polymer was dissolved in 10 ml of the solvent at 20℃ and titrated with acetone until turbidity began to appear. The calculated precipitabilifies gave a linear function with the reciprocal of the molecular weights obtained from carboxyl group titration method. The values of the constants in the Schulz equation γ =...

A method of the determination of the precipitability of polycaprolactam was established, using phenol-alcohol-water (volume ratio 2∶1∶1) as the solvent and acetone as the precipitant. 0.2 g of the polymer was dissolved in 10 ml of the solvent at 20℃ and titrated with acetone until turbidity began to appear. The calculated precipitabilifies gave a linear function with the reciprocal of the molecular weights obtained from carboxyl group titration method. The values of the constants in the Schulz equation γ = α + β / M were α = 21.1, β = 30,100. They could ,be applied to evaluate the molecular weight of polycaprolactam when the degree of polymerization was not very high ((?), 2000-5400).

關於聚己內醯胺沉澱度的测定,作者建立了以苯酚-乙醇-水(2∶1∶1)為溶劑、丙酮為沉澱劑的方法。將0.2克聚己內醯胺溶於10毫升溶劑,在20°以丙酮滴定至初現混濁。低聚合度的聚合物((?)在2000-5400間),其沉澱度與自羧基滴定測得的數均分子量(?)倒數成直線關係,按Schulz方程γ=α+β/M計算得出α=21.1,β=30100。這些數值不適用於較高分子量的聚合物。

A sample of butadiene-styrene copolymer obtained from emulsion polymerization at 50℃ with 80% conversion has been doubly fractionated into fractions by adding successive amounts of methanol at 25℃ into a 1% solution of the polymer in benzene. From the weight and intrinsic viscosity of each fraction obtained, an integral weight distribution curve was drawn according to the method of Schulz and Dinlinger. The differential distribution curve exhibits a rather sharp maximum around the molecular weight of 50,000,...

A sample of butadiene-styrene copolymer obtained from emulsion polymerization at 50℃ with 80% conversion has been doubly fractionated into fractions by adding successive amounts of methanol at 25℃ into a 1% solution of the polymer in benzene. From the weight and intrinsic viscosity of each fraction obtained, an integral weight distribution curve was drawn according to the method of Schulz and Dinlinger. The differential distribution curve exhibits a rather sharp maximum around the molecular weight of 50,000, in agreement with many published results including one obtained from ultracentrifuge data. The fractions with [η]>3, i.e., M>500,000 took a couple of weeks to go into solution, indicating an appreciable degree of branching or slight cross-linking of the macromolecules. The viscosity data of the fractions in toluene at 30℃ show that the values of k' snd β of the equations Inη_r/C = [η] - [β] [η]~2C η_(sρ)/C = [η] + k' [η]~2C are constant, k'=0.36, being independent of molecular weight and k' + β = 1/2 for fractions with [η]>3. For fractions with [η]>3, k'>0.36, in conformity with the findings of Cragg and others that k' increases rapidly with the presence of branching or cross-linking. Besides, we found that for these fractions, k'+β>1/2, which relationship can also be used for the detection of branching in butadiene-styrene copolymer.

本文報告測定本所合成研究室用乳液聚合在50°時所製備的丁苯橡膠分子量分佈的結果。我們在1%苯溶液中,加入甲醇作沉澱劑經分級沉澱後,用粘度法測定各級份的分子量。所得分子量分佈曲線,在分子量等於50,000處有一個明顯的高峯,與前人的結果相符合。特性粘數[η]>3的級份,從它們的溶解度和在甲苯溶液中的粘度數據,我們認為有顯著的支鏈和交聯的存在,約佔試樣的25%。甲苯溶液的粘度數據指示在[η]<3時,k′=0.36,與分子量無關,而且k′+β=1/2;當[η]>3時,k′值顯著地增大,而且k′+β>1/2。 這些差異的大小,我們認為可以看作丁苯橡膠分子支鏈或交聯程度的一種量度。 從本實驗所得的丁苯橡膠的分子量分佈曲線,我們建議同時用■和■來做橡膠的品質指示。

 
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