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  “black”译为未确定词的双语例句
    Study on Technologies of Characterization and Grafting Polymers for Carbon Black Pigment
    色素炭黑的表征技术与接枝高分子技术的研究
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    Effect of Surface Roughness of Carbon Black on Reinforcement in Rubber
    炭黑表面粗糙度对橡胶补强作用的影响
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    MOLECULAR WEIGHT AND MOLECULAR WEIGHT DISTRIBUTION OF COMPOUNDED RUBBER FILLED WITH CARBON BLACK
    炭黑混炼胶的分子量和分子量分布
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    Fluorescence Analysis of Non-wood Fiber Lignin in Black Liquors and Red Liquors
    以荧光分析法测定非木材纤维原料木素含量控制蒸煮程度
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    Design of Black Liquor Combustion for 100t/d Wood Kraft Pulp Plant
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Effects of garlic and black grape extracts on the activity of adenosine deaminase from cancerous and noncancerous human urinary
      
A black-scholes formula for option pricing with dividends
      
We obtain a Black-Scholes formula for the arbitrage-free pricing of European Call options with constant coefficients when the underlying stock generates dividends.
      
The impact of different interference substrate materials for improving the color travel effect was studied, and the influence of white and black background on the hue and the color travel effect were studied.
      
Nutrient Dynamics of Fine Roots in the Mixed Plantation of Poplar and Black Locust
      
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The properties of cis-l,4-polybutadiene rubbers with different molecular weights which were obtained with titanium catalyst have been studied.The properties of raw cis-l,4-polybutadiene rubbers with different molecular weights are similar to each other with respect to (1) gel content, less than 1%, (2) cis-l,4-con-tent, 93-97%, and (3) glass temperature, -110 to -114℃ (Table 1A). However, the Mooney viscosity increases rapidly with [η] (Fig. 1). It is shown by stress-strain curves that all the cid-l,4-polybutadiene...

The properties of cis-l,4-polybutadiene rubbers with different molecular weights which were obtained with titanium catalyst have been studied.The properties of raw cis-l,4-polybutadiene rubbers with different molecular weights are similar to each other with respect to (1) gel content, less than 1%, (2) cis-l,4-con-tent, 93-97%, and (3) glass temperature, -110 to -114℃ (Table 1A). However, the Mooney viscosity increases rapidly with [η] (Fig. 1). It is shown by stress-strain curves that all the cid-l,4-polybutadiene samples under examination do not crystallize during stretching (Fig. 2).The behaviour of cis-l,4-polybutadiene in milling is very sensitive to temperature. Carbon black compoundings have been carried out on an open laboratory mill at cylinder temperatures of 25, 40, and 60 ℃, respectively. Smooth compounds from which vul-canizates with tensile strength over 200 kg/cm2 may be prepared can only be obtained at 25℃. When compounding is carried out at 40 or 60℃, cis-l,4-polybutadiene tends to crumble (Fig. 4), no smooth compound can be prepared, and the vulcanizate obtained loses tensile strength (Fig. 3).According to the following experimental results: (1) no gel formation, no significant degradation, and no change in microstructure can be observed when cis-l,4-poly-butadiene is masticated either at 25 ℃ or at 40 or 60 ℃ (Fig. 6 and Table 3); (2) the effect of temperature on milling is reversible (Table 4), it is presumed that the loss of tensile strength of the vulcanizate obtained from compound prepared at 40 or 60℃ is due to the difficulty of incorporation and dispersion of carbon black into the cis-1,4-polybutadiene rubber at a temperature above 40 ℃. This presumption is supported by the microscopic photographs of the cross-sections of the vulcanizates (Fig. 5).It is found that the tensile strength of the vulcanizate decreases rapidly as the modulus (M330%) exceeds 60 kg/cm2 (Fig. 8). However, with a suitable amount of sulphur to control the degree of cross-Hnking, vulcanizates of tensile strengths over 200 kg/cm2 can be obtained (Fig. 8 and Table 1B). The elastisity (Yerzley) and abrasive resistance of cis-l,4-polybutadiene vulcanizates are much better than those of natural rubber (Table IB).The effect of molecular weight of cis-l,4-polybutadiene on the mechanical properties of the vulcanizate has been investigated. It is found that vulcanizates of tensile strength around 200 kg/cm2 can be obtained within wide range of molecular weights ([η] 2.5 to 3.6), whereas elasticity increases with the [η] of the raw rubber (Fig. 9).

研究了用钛盐催化剂制备而具有不同分子量的顺-1,4-聚丁二烯的性貭。 各种具有不同分子量的顺-1,4-聚丁二烯生胶的性貭很相似:(1)凝胶含量低于1%,(2)玻璃化温度在—110至—114℃之间,(3)顺-1,4结构含量在93至97%(表1A)。但门尼粘度则随[η]值而激增(图1)。从生胶的应力-应变曲线可见各种顺-1,4-聚丁二烯样品在拉伸时并没有结晶现象(图2)。 顺-1,4-聚丁二烯在滚筒上的加工性能对配炼温度极敏感。在25℃,40℃和60℃滚筒温度下的加炭黑配炼试验中,发现唯有在25℃下配炼才得到光滑的混合物,由此可制得抗张强度超过200公斤/厘米~2的硫化物中,如果配炼系在40℃或60℃下进行,则顺-1,4-聚丁二烯趋向于破碎(图4),得不到光滑的混合物,由此而制得的硫化物丧失抗张强度(图3)。 根据下列试验结果:(1)将顺-1,4-聚丁二烯分别在25℃,40℃和60℃下进行素炼,在素炼过程中都不产生疑胶,无明显的降解(图6),又素炼后链节结构并无变化(表3);(2)温度对滚炼的影响是可逆的(表4)。我们认为,在40℃或60℃下配炼得到的硫化物之所以丧失抗张强度可能由于炭黑没有均匀分散。从合炭黑硫化...

研究了用钛盐催化剂制备而具有不同分子量的顺-1,4-聚丁二烯的性貭。 各种具有不同分子量的顺-1,4-聚丁二烯生胶的性貭很相似:(1)凝胶含量低于1%,(2)玻璃化温度在—110至—114℃之间,(3)顺-1,4结构含量在93至97%(表1A)。但门尼粘度则随[η]值而激增(图1)。从生胶的应力-应变曲线可见各种顺-1,4-聚丁二烯样品在拉伸时并没有结晶现象(图2)。 顺-1,4-聚丁二烯在滚筒上的加工性能对配炼温度极敏感。在25℃,40℃和60℃滚筒温度下的加炭黑配炼试验中,发现唯有在25℃下配炼才得到光滑的混合物,由此可制得抗张强度超过200公斤/厘米~2的硫化物中,如果配炼系在40℃或60℃下进行,则顺-1,4-聚丁二烯趋向于破碎(图4),得不到光滑的混合物,由此而制得的硫化物丧失抗张强度(图3)。 根据下列试验结果:(1)将顺-1,4-聚丁二烯分别在25℃,40℃和60℃下进行素炼,在素炼过程中都不产生疑胶,无明显的降解(图6),又素炼后链节结构并无变化(表3);(2)温度对滚炼的影响是可逆的(表4)。我们认为,在40℃或60℃下配炼得到的硫化物之所以丧失抗张强度可能由于炭黑没有均匀分散。从合炭黑硫化物断面的显微镜照片亦可看到在25℃下配炼的硫化物确不同于在40℃和60℃下配炼者(图5A)。 当含炭黑硫化物的定伸强度(M_(300%))超过60公斤/厘米~2

Nitrogen adsorption and macromolecular adsorption show that there are more micropores on the surface of the experimental carbon black. We have studied the effect of micropores of black on reinforcement in NR (Natural Rubber), BR (Butadiene Rubber) and SBR (Styrene-Butadiene Rubber) by measuring tensile resistance of black filled Vulcanizates. It has been found that under same conditions the bond strength between NR or BR and the experimental black was weaker. This phenomenon is probably...

Nitrogen adsorption and macromolecular adsorption show that there are more micropores on the surface of the experimental carbon black. We have studied the effect of micropores of black on reinforcement in NR (Natural Rubber), BR (Butadiene Rubber) and SBR (Styrene-Butadiene Rubber) by measuring tensile resistance of black filled Vulcanizates. It has been found that under same conditions the bond strength between NR or BR and the experimental black was weaker. This phenomenon is probably due to poreinduced cavity. The effect of roughness of black on tensile resistance of black filled SBR vulcanizate differs from that of NR and BR vulcanizates, because it has different relaxation characteristics.

用大分子吸附(OT吸附及CTAB吸附)和低温氮吸附测定的试验炭黑和普通高结构中超耐磨炉黑的比表面积和表面粗糙度表明,试验炭黑的表面粗糙度比较大,其表面11—15A细孔内的表面积比普通产品高10m~2/g。通过拉伸电阻率的测定发现,在天然胶和顺丁胶中含试验炭黑的硫化胶电阻率最低点处的伸长率比较低,炭黑与橡胶之间的结合比较弱。这可以用炭黑表面细孔诱导硫化胶内“空洞”产生和扩展以及炭黑聚集的观点来解释,从而认为炭黑表面粗糙度对橡胶的补强作用有直接影响。这可能是含试验炭黑的轮胎胎面(顺丁胶与天然胶之比为70/30)在实际里程试验中耐磨性大大低于普通高结构中超耐磨炭黑的原因。试验中观察到,丁苯胶中炭黑粗糙度对拉伸电阻率的影响不同于天然胶和顺丁胶,这是丁苯胶松弛特性不同造成的。

A comprechensive analysis has been made on the chemical composition of the black liquor of Eucalyptus citriodora chips in the sulfate and soda-anthraquinone cooking process. Relatons between the concentrations of two black liquors and the content of total solids, relations between the viscosity, temperature and concentration of the black liquors as well as the amounts of carbon, oxygen, hydrogen, nitrogen, sulfur, sodium, etc. and the calorific values in the solids of the black liquors...

A comprechensive analysis has been made on the chemical composition of the black liquor of Eucalyptus citriodora chips in the sulfate and soda-anthraquinone cooking process. Relatons between the concentrations of two black liquors and the content of total solids, relations between the viscosity, temperature and concentration of the black liquors as well as the amounts of carbon, oxygen, hydrogen, nitrogen, sulfur, sodium, etc. and the calorific values in the solids of the black liquors have been worked out. Data obtaidne from analysis results show that alkali recovery technique can be used inthe black liquor sulfate and soda anthraquinone cooking process.

对柠檬桉木硫酸盐法和烧碱—蒽醌法蒸煮黑液进行了化学成分全分析,测定了两种黑液浓度与总固形物含量之间的相互关系和黑液粘度与温度、浓度之间的相互关系,以及黑液固形物中碳、氢、氧、氮、硫、钠等元素含量和热值。从分析结果得到的数据看,柠檬桉木硫酸盐法和烧碱—蒽醌法蒸煮黑液可以采用传统的碱回收工艺。

 
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