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the grafting yield
相关语句
  膜的接枝率
     Temperature was also a factor that affects the grafting yield.
     反应温度对接枝膜的接枝率也有影响 ,温度过高 (>70℃ )或过低 (<4 0℃ )都得不到较高的接枝率 ;
短句来源
     Results showed that the grafting yield heavily affected the gating characteristics.
     研究结果表明,开关膜的接枝率对膜的开关特性有十分重要的影响。
短句来源
     The results showed that the grafting yield heavily affected water flux,responsiveness coefficient and thermo-responsive gating factor of membrane pore size.
     结果表明 ,开关膜的接枝率对膜的过滤通量、温度感应开关系数和膜孔径感温变化倍数都有十分重要的影响 .
短句来源
     The results show that the grafting yield of PMAA heavily affects the water flux, the pH-responsiveness coefficient and the pH-responsive gating factor of membrane pore size.
     结果表明,开关膜的接枝率对膜的过滤通量、pH感应开关系数和膜孔径感应pH变化倍数都有重要的影响。
短句来源
  接枝率
     The grafting yield was in the range of 150% -250% when the volume fraction of the monomers was 20% -25% and the co-irradiation dose was 1.2-1.8 kGy/h.
     当单体体积分数为20%-25%,辐射剂量率为1.2~1.8 kGy/h时,接枝率 可以控制在150%~250%。
短句来源
     The results show that the grafting yield is higher and the mechanical strength is better when the dose rate is(0.5) kGy/h~(1.0) kGy/h,co-irradiation time was 5 h~8 h,and divinylbenzene content is 2%.
     结果表明,共辐照接枝反应中,当二乙烯苯含量2%,剂量率0.5 kG y/h~1.0 kG y/h,照射时间5 h~8 h时,接枝纤维的接枝率和力学强度较高。
短句来源
     Optimum technique conditions of carbon black modified are gained. It is indicated that when concentration of methylhydroxide carbon black is 0.22 g/mL,and Ce~(4+) concentration as a promoter is 16 mmol/L,as well as monomer concentration is(6.3 mol/L) and system acidity is 0.66 mol/L,and reaction temperature is maintained at 50 ℃,the grafting yield of the carbon black will be 6% approximately.
     得到碳黑改性的最佳工艺条件为:羟甲基化碳黑质量浓度0.22 g/mL、单体浓度6.3 mol/L、硝酸浓度0.66 mol/L、引发剂Ce4+离子浓度16 mmol/L、反应时间4 h、反应温度50℃,接枝率达6%.
短句来源
     Electron beam coirradiation induced graft polymerization has been carried out in air between methyl methacrylate (MMA) and anataseand rutileTiO2 nanoparticles, respectively. The results show that the grafting yield of ATiO2 (10.5%) is larger than that of RTiO2 (6.1%), owing to its high specific surface area.
     锐钛矿和金红石型纳米TiO2(A-TiO2和R-TiO2)分别与甲基丙烯酸甲酯(MMA)在空气中进行电子束共辐射接枝聚合,结果表明A-TiO2接枝率(10.5%)高于R-TiO2(6.1%),被认为是由于A-TiO2具有较高的比表面积造成的。
短句来源
     It was found that the grafting yield was increased with dose up to 40kGy, but decreased with dose rate from 50 to 500 Gy/min.
     但随剂量率的增加(50~500Gy/min),接枝率反而下降。
短句来源
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  “the grafting yield”译为未确定词的双语例句
     The effects of the reaction time and the solvent on the grafting yield were investigated. The grafted carbon black was characterized by FTIR spectrum,TG,TEM and dispersing stability test.
     研究了反应时间、反应溶剂、催化剂对反应的影响,并利用TG、FTIR、TEM、分散稳定性实验等手段考察了改性炭黑的有关性能。
短句来源
     In thiswork, the cuves of grafting yield as a function of absorbed dose showed that therewere about two regions of dose: lower than 5 kGy, the grafting yield of AA on sili-cone robber was enhanced by acid; the other region, dose growing up to about 13kGy, the opposite results were obtained.
     <5kGy时酸有敏化作用,在5—13kGy范围酸有相反的效果。
短句来源
     At lower concentration of monomer (10% ) the relationship between grafting, yield and total dose, dose rate,reaction time and reaction trmperature w4s measured. It was found that in the temperature range of 294 K to 323 K the grafting yield decreased With increasing of grafting reaction temperature.
     在较低剂量(2—3kGy)、较短反应时间(2—3h)、较低单体浓度(~10%)和较低反应温度.(294K左右)下,得到较好的接枝效果。
短句来源
     The effects of pre-irradiation dose, grafting temperature, monomer concentration and reaction time on the grafting yield were investigated, and the dynamic range of responsive grafted track pores were observed.
     考察了预辐照剂量、接枝温度、单体浓度和反应时间等因素对接枝的影响 ,以及膜孔开闭动态变化。
短句来源
     The grafting yield were studied with different experimental conditions of the mono-mer concentration, irradiation dose and reaction temperature.
     研究发现,接枝速率与辐照剂量、单体总浓度及反应温度密切相关。
短句来源
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  the grafting yield
The adhesive characteristics with the grafting yield were investigated using conventional acrylic bone cement based on poly(methyl methacrylate) [PMMA].
      
The effects of irradiation dose, reaction temperature and reaction time on the grafting yield were studied.
      
The grafting yield is much higher in homogeneous conditions.
      
In all cases, the polyethylene oxide (PEO) sequence of the dispersant was partly incorporated at the surface of the latex particles, but the grafting yield of polyethylene oxide chains was always limited and did not exceed 15%.
      
The modified fiber was characterized with IR, scanning electron microscopy (SEM), elemental analysis, XPS, contact angle measurement and the grafting yield.
      
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The photo-induced grafting copolymerization of N-vinyl-2-pyrrolidone (NVP) to segmented polyetherurethane (SPEU) was studied. The experiments in this work were performed at nitrogen atmosphere and room temperature by using UV light.The effects of concentration of N-VP and light sensitive agent DMT in the grafting solutions and irradiation time on the grafting yield in acid and basic mediums were investigated. The swelling behavior of modified films in water was followed and the surface structure of the...

The photo-induced grafting copolymerization of N-vinyl-2-pyrrolidone (NVP) to segmented polyetherurethane (SPEU) was studied. The experiments in this work were performed at nitrogen atmosphere and room temperature by using UV light.The effects of concentration of N-VP and light sensitive agent DMT in the grafting solutions and irradiation time on the grafting yield in acid and basic mediums were investigated. The swelling behavior of modified films in water was followed and the surface structure of the films was observed by scanning electron microscope.All the results showed that this kind of photo-induced grafting occured successfully in alkaline medium. The reason of the alkaline effect was discussed briefly.

本文研究了在碱性介质中,氮气氛下 N-乙烯基吡咯烷酮(N-VP)在嵌段聚醚聚氨酯(SPEU)膜上的接枝聚合。测定了接枝率与接枝液中 N-VP单体浓度、光照时间、催化剂浓度等条件的关系。测定了接枝后 SPEU 膜的吸水性,并用扫描电镜对膜表面进行了观察。对碱性介质中的接枝机理进行了初步探讨。

Photo-induced grafting polymerization of acrylamide (AAM) onto polyetherurethane (PEU) was studied with benzophenone (BP) as sensitizer under irradiation of 365 nm. The effects of irradiation time, concentrations of monomer and sensitizer on the grafting yield were investigated. The formatioin of graft copolymer was verified by its water absorption % and the scanning electron microscopy photographs. Some model compounds of PEU soft segment and hard segment were used to clarify the graft reaction mechanism,...

Photo-induced grafting polymerization of acrylamide (AAM) onto polyetherurethane (PEU) was studied with benzophenone (BP) as sensitizer under irradiation of 365 nm. The effects of irradiation time, concentrations of monomer and sensitizer on the grafting yield were investigated. The formatioin of graft copolymer was verified by its water absorption % and the scanning electron microscopy photographs. Some model compounds of PEU soft segment and hard segment were used to clarify the graft reaction mechanism, which was proposed to involve the hydrogen abstraction by excited triplet BP from a-carbon of the polyether segment and from nitrogen of the hard segment. The produced radicals then initiate the graft polymerization.

本文研究了以二苯酮为光敏剂,在365nm光照下丙烯酰胺在聚醚氨酯表面的接枝聚合。研究了光照时间、单体浓度、二苯酮浓度对接枝率的影响。对产物作吸水性测定和扫描电镜观察,均证实是接枝共聚物。通过模型化合物的研究,认为激发三线态的二苯酮提取了聚醚氨酯中聚醚软段叔碳原子的氢和氨酯基氮原子上的氢,使这些部位产生自由基,引发单体接枝聚合。

Sodium 6-sulfohexyl acrylate (SSHA) and acrylamide (AAM) were grafted onto segment polyether urethane (SPEU)films under UV light irradiation with benzophenone as photosensitizer. The effect of the structure of monomers and the reaction conditions on the grafting yield was obvious. The formation of graft copolymer was verified by solubility, water absorption and the scanning electron microscopy photographs of the grafted films. In order to clarify the grafting site, graft copolymerization of AAm onto...

Sodium 6-sulfohexyl acrylate (SSHA) and acrylamide (AAM) were grafted onto segment polyether urethane (SPEU)films under UV light irradiation with benzophenone as photosensitizer. The effect of the structure of monomers and the reaction conditions on the grafting yield was obvious. The formation of graft copolymer was verified by solubility, water absorption and the scanning electron microscopy photographs of the grafted films. In order to clarify the grafting site, graft copolymerization of AAm onto the model compounds of SPEU hard segment and soft segment was investigated. The chemical composition of the graft copolymer was examined by NMR, IR and elemental analysis. The experimental results showed that the grafting sites appear to be at nitrogen of amino group and α-carbon of ether linkage and ester group.

以二苯酮作光敏剂,在紫外光照射下,引发亲水性单体:丙烯酸己磺酸钠,丙烯酰胺接枝于聚醚氨酯膜上。单体结构与反应条件对接枝率均有影响。接枝后膜的溶解性、吸水率以及表面形态比接枝前有显著变化。以二苯酮作光敏剂将丙烯酰胺接枝于聚醚氨酯硬段与软段模型化合物的研究结果表明,氨基甲酸酯中氨基氮上的氢,酯基中以及醚键旁α碳上的氢均可被提取,成为接枝点。

 
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