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mdi     
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  异氰酸酯
     e. KPB1 and KPB3,were made in laboratorywith 3% MDI. Densities for KPB1 were 0.55,0.70 and 0.85g/cm~3,and 0.85g/cm~3 for KPB3.Three sur-face-to-core ratios for KPB3 were set as 3:7,1:1,and 2:1,respectively.
     采用异氰酸酯(MDI,3%)试制了单层(密度:0.55、0.70、0.85g/cm~3)和三层洋麻秆刨花板(密度:0.85g/cm~3;表芯比:3∶7、1∶1、2∶1),分别根据ASTM D1037和ANSI A208.1标准测试和评价了板的性能。
短句来源
     Bi-component (BPAN-1A-NT/M20S) thin films were prepared by spin-coating from the solution of BPAN-1A-NT mixed with certain amount of a cross linking agent M20S (MDI based isocyanate).
     将BPAN 1A NT与适当量的异氰酸酯交联剂M2 0S混合 ,得到了双组分非线性光学聚合物体系BPAN 1A NT M2 0S .
短句来源
     The production and market demand of isocyanate MDI are introduced in this paper as well as its synthesizing methods.
     介绍了异氰酸酯(MDI)的生产及其市场情况,综述了MDI的合成方法,通过分析和比较这些合成方法,得出了今后合成MDI的主要方法应是非光气法.
短句来源
     By means of Micro-FTTR, Cross Polarization and Magic Angle Spinning 13C Nuclear Magnetic Resonance(CP/MAS 13C-NMR) and adhesive interface model, three different adhesives were mixed with cellulose separately and hot pressed. The results show that the active groups (桸H2, 桟H2OH, 桸=C=O) of UF, PF and MDI reacted with -OH group of C3, C6 in cellulose.
     利用显微-FTIR、CP/MAS~(13)C-NMR分析技术和麦秆胶接界面模型对三种不同胶粘剂与纤维素混合热压前后的变化表明:脲醛树脂、酚醛树脂利异氰酸酯树脂中的活性基团(—NH_2、—CH_2OH、—N=C=O)可以与纤维素C3、C6上的—OH发生化学反应。
短句来源
     ISOCYANATE MDI PRODUCING ADD MARKET SURVEY
     异氰酸酯MDI制造及市场概况
短句来源
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  多文档界面
     With the development of java programming language, java-based MDI desktop applications are increasingly popular.
     随着Java编程语言的发展,基于Java的多文档界面桌面应用程序日益普及。
短句来源
     Design and implementation of java MDI class library
     Java多文档界面类库的设计和实现
短句来源
     A set of software using Multiple Document Interface(MDI) running under Microsoft Win98 / Win2000 is developed.
     同时编制了运行于Win98/Win2000平台的图形化多文档界面的采集应用软件。
短句来源
     Based on the Client/Server mode and by use of the multi-document interface (MDI) style, the optimal operation model can solve the runoff forecast and generation scheduling problems for large-scale hydropower systems.
     该系统基于客户/服务器 (C/S)模式,使用多文档界面(MDI)风格,模型系统可成功解决大规模水电系统的径流预报和发电调度问题。
短句来源
     Design and Implementation of MDI Text Editor
     多文档界面文本编辑器的设计与实现
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  “mdi”译为未确定词的双语例句
     Results:MDI was 92.027±8.48,87.844±7.89 and 83.821±8.693 for Group A,B and C respectively.
     结果:12个月时A、B、C组患儿的MDI分别为92.027±8.48、87.844±7.89和83.821±8.693;
短句来源
     Comparing the Bayley scale of asymptomatic group (MDI110.89±11.21; PDI112.44 ± 19.26) with the control group(MDI108.50± 17.05; PDI107.00± 10.84), there is no difference.
     感染组婴儿发育智商(MDI110.89±11.21;PDI112.44±19.26)与对照组(MDI108.50±17.05;PDI107.00±10.84)比较差别没有统计学意义。
短句来源
     2. To integrate MDI and Web Services.
     2.MDI与Web Services的集成。
短句来源
     At the optimal process ing conditions of molding temperature 100 ℃,extruding temperature 100 ℃ and m ould chamber length 10 mm, bending strength of PDLLA/MD and PDLLA/HA/MDI composi tes is 51.3 MPa and 55.4 MPa, respectively and their bending modulus is 1 830.9 MPa and 2068.5 MPa, respectively.
     在模压温度100℃,挤出温度100℃、口模长度10mm的最佳成型工艺条件下,PDLLA/MDI和PDLLA/HA/MDI复合材料的弯曲强度分别为51.3MPa和55.4MPa,弯曲模量分别为1830.9MPa和2068.5MPa。
短句来源
     The results indicate that when n(MDI)∶n(polyether diol)=1.42∶1,the reaction temperature is 82 ℃,the prepolymerization time is 1 h,the chain-extending reaction time is 2 h,and the value of R is between 1.02~1.07, a kind of PU coating with water pressure resistance of 20.4 kPa and moisture permeability of 4533 g/(m2·d) is obtained.
     结果表明,n(MDI)∶n(聚醚二醇)=1.42∶1,反应温度82℃,预聚反应时间1h,扩链反应时间2h,R值为1.02~1.07时,制得的涂层剂耐静水压值达到20.4kPa,透湿量达到4533g/(m2·d)。
短句来源
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  mdi
In this paper, the quadratic program problem and minimum discrimination information (MDI) problem with a set of quadratic inequality constraints and entropy constraints of density are considered.
      
The liquid crystal polyurethanes were prepared by 1,4-bis(p-hydroxyalkoxybenzoate)phenylene with MDI (p-methylene diphenylenediisocyanate) and 2,4-TDI(2,4-toluenediisocyanate), respectively.
      
Adhesive application method in MDI-UF particleboard manufacture
      
In this study, we investigated the use of an emulsifiable diphenylmethane-4, 4'-diisocyanate (MDI) - urea formaldehyde (UF) mixture adhesive in particleboard manufacture, in order to decrease F-emission to below 9 mg per 100 g board.
      
We paid close attention to the effect of NH4Cl on MDI-UF curing and the method of adhesive application by differential scanning calorimetric (DSC) analysis and compared mechanical properties.
      
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The mechanism of solution polycondensation of MDI with TMA was preliminarily studied with model compound, by means of Semi-quantitative analysis of infra-red spectroscopy and viscosity. It is found that the polycondensation is an irreversible reaction and its important characteristic is that amido and imido groups are formed at the same time. The viscosity of the solution increases with the increasing of MDI in excess and eventually gelation takes place. All the solvents which contain active hydrogen...

The mechanism of solution polycondensation of MDI with TMA was preliminarily studied with model compound, by means of Semi-quantitative analysis of infra-red spectroscopy and viscosity. It is found that the polycondensation is an irreversible reaction and its important characteristic is that amido and imido groups are formed at the same time. The viscosity of the solution increases with the increasing of MDI in excess and eventually gelation takes place. All the solvents which contain active hydrogen or unshared electrons are not suitable for this reaction due to the possibility of addition reaction with MDI. When the water content of the solvent used is over 0.16%, the polycondensation reaction can not normally proceed. Because of the absence of labile polyamide-acid and only CO2 evolving during the polycondensation, the storage stability of the condensation solution shows good.The high temperature treatment of the polycondensate induces the further completion of imidezation and changing of the structure of molecular aggregation, and thus causes the molecular weight to increase continuously. The addition of a certain amount of epoxide resin of low molecular weight into the polyconsation system not only reduces the fabrication temperature of the PAI about 80℃, but also improves both the property of film formed and its storage stability.

本工作用有关模型化合物、红外分析和ln η_r/C初步研究了MDI与TMA溶液缩聚反应机理,发现反应是一个单向缩聚反应,它的重要特征是酰胺与酰亚胺基团同时形成。在反应中随着MDI的过量溶液粘度随之增加以致成为胶冻,凡带活泼氢或含未共事电子的溶剂因可能与MDI加成而不适用,当溶剂的水份>0.16%时,缩聚反应不能正常进行,由于反应中不产生易降解的聚酰胺酸,仅选出CO_2,故缩聚液的贮存稳定性较好,缩聚产物的高温热处理起着继续增长分子量,补充酰亚胺化和改变序态结构的作用。在缩聚体系里加入适量的低分子环氧树脂可使PAI的成型温度约降低80℃。

Grafting polymerization of acrylamide (AAM) onto polyether urethane (PEU) was investigated in aqueous solution by using eerie ammonium nitrate (CAN) as-initiator. The grafted polymers were synthesized as follows: (i) a variety of PBU from poly (oxytetramethylene) glycol (PTMG), 4,4'-diphenylmethane diisocyanate (MDI), and ethyleneamine (E) or butandiol (B) as extender under different reaction conditions were used to cast into films; (ii) grafting of PAAM onto PEU film by using CAN and (iii) the grafted...

Grafting polymerization of acrylamide (AAM) onto polyether urethane (PEU) was investigated in aqueous solution by using eerie ammonium nitrate (CAN) as-initiator. The grafted polymers were synthesized as follows: (i) a variety of PBU from poly (oxytetramethylene) glycol (PTMG), 4,4'-diphenylmethane diisocyanate (MDI), and ethyleneamine (E) or butandiol (B) as extender under different reaction conditions were used to cast into films; (ii) grafting of PAAM onto PEU film by using CAN and (iii) the grafted PEU substrate was then extracted with boiling distilled water, to remove the residues of AAM and PAAM homopolymer. The PEU films of varying thicknesses with either B or E as extender could be easily grafted by AAM. The grafting polymerization was verified from the fact that the grafted substrates become opaque and possessing higher percentage of water absorption than the original one, and from the scanning electron microscopy photographs with salient micrograph showing grafts of macrochain on the surface of film, In addition, the factors that influence the grafting copolymerization were studied, and the mechanism of grafting polymerization has been proposed.

由聚四亚甲基醚二醇、4,4′-二苯基甲烷二异氰酸酯与乙二胺或丁二醇扩链剂合成的聚醚氨酯薄膜,可顺利地在室温下用硝酸铈铵引发接枝丙烯酰胺共聚合反应,这可以从反应后的薄膜由起始时是透明的而变为不透明,也可以从接枝后的薄膜比基膜有较大的吸水率,以及从扫描电子显微镜观察到薄膜表面上有凸起图象的高分子链所证实,由于先发生接枝共聚合而后才是均聚反应,因而保证了接枝后的薄膜几乎不附着聚丙烯酰胺。

A new method of graft copolymerization of acrylamide (AAM) on poly(etherure-thane) (PEU) which was prepared from poly(oxytetramethylene) glycol (PTMG), 4,4'-diphenylmethane diisocyanate (MDI) and ethylene diamine (E) or butanediol (B) extender was investigated. Hydroperoxide group was first introduced onto the surface of poly(ether-urethane) through photo-oxidation in the presence of hydrogen peroxide, then it was reacted with ferrous ion or N, N-dimethyl toluidine (DMT) to initiate AAM graft copolymerization...

A new method of graft copolymerization of acrylamide (AAM) on poly(etherure-thane) (PEU) which was prepared from poly(oxytetramethylene) glycol (PTMG), 4,4'-diphenylmethane diisocyanate (MDI) and ethylene diamine (E) or butanediol (B) extender was investigated. Hydroperoxide group was first introduced onto the surface of poly(ether-urethane) through photo-oxidation in the presence of hydrogen peroxide, then it was reacted with ferrous ion or N, N-dimethyl toluidine (DMT) to initiate AAM graft copolymerization on PEU surface. The graft reaction could be carried o,ut at low temperature with high speed. The grafted PEU film became opaque and its water absorption increased. The formation of graft copolymer has been verified by its water absorption % and the scanning electron microscopy photographs. Some model compounds of PEU soft segment and hard segment were synthesized in order to clarify the graft reaction mechanism. The results of oxidation and graft copolymerization of model compounds showed that this graft copolymerization possesses higher selectivity, and it takes place predominately in polyether segment because the ether linkage in soft segment is very sensitive to oxidation and can form hydro-peroxide easily. Thus, the grafting site appears to be at o-carbon of the ether linkage.

本文研究了在聚醚氨酯表面上进行接枝共聚合的新方法。首先在聚醚氨酯薄膜上通过过氧化氢光氧化引入过氧化氢基,然后在还原剂亚铁盐或N,N-二甲基对甲苯胺的作用下引发丙烯酰胺接枝共聚合,反应具有低温快速的特点。产物经吸水性实验及扫描电子显微镜观察均证实了是一接枝共聚物。通过模型化合物的研究证明,接枝反应具有较高的选择性,接枝共聚占优势地发生在聚醚软段上,接枝地点很可能就在醚键旁的α-碳原子上。

 
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