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放热峰宽
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  exothermic peak width
     The results show that the incubation time is very small even at a low annealing temperature (743 K) and the exothermic peak width, reflecting the time for the actual crystallization process, increases greatly when annealing temperature decreases. This suggests a growth-controlled crystallization process.
     实验结果表明 ,晶化过程的孕育期很短 ,即使在 74 3K这样低的温度下也不过 0 .5 2min ,而放热峰宽 (反应整个晶化过程进行的时间 )却随退火温度的降低明显增大 ,这说明了结晶过程是一个晶核长大控制的过程 .
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  “放热峰宽”译为未确定词的双语例句
     For the same IA content in the feed AN/IA ratio,the high molecular weight P(AN- co -IA)copolymers have the lower start exothermal reaction temperature and wider DSC exothermal peak as compared to the convertional low molecular weight P(AN- co -IA) copolymers,and these phenomena are consistent with the result of IR studies.
     对于喂料AN IA配比中IA含量相同的P(AN co IA)共聚物 ,高分子量P(AN co IA)共聚物比常规低分子量的放热峰起始温度低 ,放热峰宽
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  相似匹配句对
     Peak temperature is 115℃, hardnessincreased to 70 in 40-50 min.
     放热曲线测得最高放热为115℃。
短句来源
     The max peaks at 320℃ and 440℃ in DTA are observed by exothermic decomposed reaction, respectively.
     在320℃、440℃分别有2个放热.
短句来源
     In addition,there also exist C=C vibra tion peak as the result of the de-hydrogen chloride reaction.
     C振动
短句来源
     JUNFENG COMPANY(pooled by CPGSC and GEO SPACE)
     俊公司
短句来源
     ②the first curing exothermal peak was at 150~240 ℃;
     ②在150~240℃范围内出现一个广、平缓的固化放热
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High molecular weight polyacrylonitrile(PAN)was obtained by the free-radical suspension copolymerization of itaconic acid(IA)and acrylonitrile(AN)which was carried out in DMSO/H 2O using azodiisobutyronitrile(AIBN)as initiator.Orthogonal design method was used to study the effect of polymerization parameters,such as the reaction temperature,monomer concentration,DMSO/H 2O ratio,initiator content and so on,on the conversion of polymerization.The reaction temperature is the most important factor determining...

High molecular weight polyacrylonitrile(PAN)was obtained by the free-radical suspension copolymerization of itaconic acid(IA)and acrylonitrile(AN)which was carried out in DMSO/H 2O using azodiisobutyronitrile(AIBN)as initiator.Orthogonal design method was used to study the effect of polymerization parameters,such as the reaction temperature,monomer concentration,DMSO/H 2O ratio,initiator content and so on,on the conversion of polymerization.The reaction temperature is the most important factor determining the conversion of copolymerization.The effect of DMSO/H 2O ratio on the conversion and viscosity-average molecular weight was specially introduced.The copolymerization reaction rate and the viscosity-average molecular weight of copolymers may decrease as the result of the high chain transfer constant of DMSO.For copolymerization of AN and IA,with the inclusion of good solvent DMSO,the solution degree of AN in DMSO/H -2O is higher than in water,as a result,the resulting copolymer pellets becomes porous.The structure and properties of PAN homopolymer and P(AN- co -IA) copolymer were also studied by using DSC, TG and IR measurements.It was shown that the conversion of polymerization could be increased by increasing reaction temperature,decreasing monomer concentration and decreasing the IA content in the feed AN/IA ratio.The results also demonstrated that the conversion of copolymerization of IA and AN decreased with the increase of DMSO content in the feed DMSO/H 2O ratio.For the same IA content in the feed AN/IA ratio,the high molecular weight P(AN- co -IA)copolymers have the lower start exothermal reaction temperature and wider DSC exothermal peak as compared to the convertional low molecular weight P(AN- co -IA) copolymers,and these phenomena are consistent with the result of IR studies.

采用丙烯腈 (AN)与衣康酸 (IA)为共聚单体 ,以偶氮二异丁腈为引发剂在混合介质二甲基亚砜 水(DMSO H2 O)中自由基沉淀共聚合 ,合成了高分子量的聚丙烯腈 .通过正交设计方法研究了聚合反应条件 ,如反应温度、单体浓度、混合介质DMSO H2 O配比等对聚合反应的转化率的影响 ,还重点探讨了混合介质DMSO H2 O配比对转化率和粘均分子量的影响 .采用DSC ,TG ,IR等手段研究了PAN均聚物及 (PAN co IA)的结构与性能 .研究结果表明 ,增加反应温度 ,降低单体浓度 ,降低喂料AN IA配比中IA的含量 ,均有利于提高聚合反应的转化率 .AN与IA共聚反应的转化率随着反应介质中DMSO含量的增加而降低 ,同时聚合物的粘均分子量也降低 .对于喂料AN IA配比中IA含量相同的P(AN co IA)共聚物 ,高分子量P(AN co IA)共聚物比常规低分子量的放热峰起始温度低 ,放热峰宽

This paper reports the investigation on the crystallization kinetics of Zr 60Al 15Ni 25 bulk glassy alloy under isothermal annealing by differential scanning calorimetry. The results show that the incubation time is very small even at a low annealing temperature (743 K) and the exothermic peak width, reflecting the time for the actual crystallization process, increases greatly when annealing temperature decreases. This suggests a growth-controlled crystallization process. The Avrami exponents indicate...

This paper reports the investigation on the crystallization kinetics of Zr 60Al 15Ni 25 bulk glassy alloy under isothermal annealing by differential scanning calorimetry. The results show that the incubation time is very small even at a low annealing temperature (743 K) and the exothermic peak width, reflecting the time for the actual crystallization process, increases greatly when annealing temperature decreases. This suggests a growth-controlled crystallization process. The Avrami exponents indicate that the crystallization mechanism changes at different annealing temperatures. The change of the crystallization mechanism is attributed to the great change of the mobility of atoms at different temperatures.

通过等温示差扫描量热法研究了Zr6 0 Al1 5Ni2 5大块非晶合金的晶化动力学 .实验结果表明 ,晶化过程的孕育期很短 ,即使在 74 3K这样低的温度下也不过 0 .5 2min ,而放热峰宽 (反应整个晶化过程进行的时间 )却随退火温度的降低明显增大 ,这说明了结晶过程是一个晶核长大控制的过程 .Avrami指数表明在不同的退火温度 ,该合金的晶化机制发生了变化 .晶化机制的变化是由于合金原子在不同温度下的扩散能力相差很大所致 .

This paper was mainly concentrated on the thermal properties of PAN precursors with different varieties and composition of co-monomers, which was characterized by the use of differential scanning calorimetry (DSC). Some domestic PAN precursors have only one exothermic peak as a result of having similar comonomers, but for that from Japan, there are two separated peaks, which makes the exothermic reaction temperature of PAN precursors wider, other than one sharply concentrated temperature zone, and a separated...

This paper was mainly concentrated on the thermal properties of PAN precursors with different varieties and composition of co-monomers, which was characterized by the use of differential scanning calorimetry (DSC). Some domestic PAN precursors have only one exothermic peak as a result of having similar comonomers, but for that from Japan, there are two separated peaks, which makes the exothermic reaction temperature of PAN precursors wider, other than one sharply concentrated temperature zone, and a separated peak will alleviate the exothermic reaction and result in reduced entropic relaxation of the molecules, maybe can avoid to some extent fusion and breaking of fibers owing to overheating resulted from sharp heat producing reaction. The process of spinning, dissolving,drawing,etc. Could hardly influence the shape of DSC exothermic peaks, but the type and quantities of comonomers are the most important effect. In addition, a adequate selection of comonomers and their optimum composition, e.g. AN/FAMS/IA=97/2.2/0.8 (w/w/w), could obtain similar one to the DSC peak of abroad PAN precursors for carbon fibers.

本文主要利用差示扫描量热分析(DSC)研究了聚丙烯腈的共聚物及其原丝的热性能,研究结果发现国产原丝具有相似的放热单峰,而日本某公司的原丝具有两个峰,分峰使聚丙烯腈原丝放热峰宽化,避免了在预氧化、碳化时放热集中产生熔化、断丝现象。聚丙烯腈原丝的纺丝、溶解、氨改性等加工过程不能明显改变其放热峰的形状,而共聚单体的种类和组成配比才是最重要的因素,通过适当的共聚单体选择、配比设计可以制得具有与日本原丝放热峰相似的聚丙烯腈聚合物或原丝。

 
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