The effect of polymerization temperature, stirring rate and electrolyte concentration on the relationship between polymerization conversion and time was examined and the internal relationship among the monomeric solubility, reaction of free radical and polymerization rate was discussed. 通过实验考察了聚合温度、搅拌速率、电解质浓度对聚合反应转化率~时间关系的影响,并讨论了单体水溶性、自由基水相反应和聚合速率等之间的内在联系。
The mechanism of the catalytic wave was considered that the disulfide bond was regenerated through oxidation reaction of reduction product& SH group by KIO 3 and its derived species with intermediate valence state ( including free radical IO-·, IO-· 2). 当KIO3存在时,在原电位处产生了LE的极谱催化波.该催化波是由于KIO3及其中间价态衍生质点(包括自由基IO-·,IO-·2)氧化LE还原产物巯基成双硫键所致。
Superoxide dismutase ( SOD) is a metal-containing enzyme which catalyzes the dismutation reaction of superoxide free radical anions and produces O 2 and H 2O 2. According to the metal it binds, SOD is classified Fe-SOD, Mn-SOD and Cu-Zn-SOD. 超氧化物歧化酶(SOD)是一种催化超氧化物阴离子自由基发生歧化反应,生成氧和过氧化氢的金属酶。按其结合的金属离子,区分为Fe-SOD,Mn-SOD和Cu、Zn-SOD三种。
The complete model explains the principle of mass transport, characteristics of heterogeneous reaction and the interaction of free radical ( co) polymerization and hydrolysis-condensation reaction in this system. 该模型反映了反应过程中的物质传递规律、非均相反应特点、自由基共聚合和水解缩合反应间的耦合关系。
The Reaction of Two Free Radical in Propylene 丙烯的两个游离基反应
[ Conclusions] In the course of acute brain ischemia injury the important cascade reaction, including disturbance of energy metabolism, acidosis and free radical injury has provided the pathologic and physiologic foundation for the mechanism study of toxin damaging brain collaterals. [结论]在急性脑缺血损伤过程中,能量代谢障碍、酸中毒、自由基损伤等级联反应重要环节,为毒损脑络机制提供了病生理学依据。
The presence of AM changes the cyclization reaction mechanism of the copolymers from a free radical cyclization reaction to an ionic one. AM的引入将聚合物的环化机理从自由基环化机理过渡为离子基环化机理。
All these are related to the catalytic reaction of α-carbon atom forming free radical, the relatively high content of planktonic algae in kerogens of carbonate rocks, and the weak adsorption of carbonate rock to organic matter and hydrocarbons. 这与α-碳原子形成自由基的催化反应、碳酸盐岩干酪根中浮游藻类含量相对较高以及碳酸盐对有机质及烃类的吸附作用弱有关。
The chemical reaction of hydroxyl radical is free radical reaction, whose reaction speed is very high. 羟基自由基参与的化学反应属于游离基反应,化学反应速度极快。
Conclusion The form of the alkene ozone oxide and its reaction course of ozone chain isomerization are likely to be the free radical ones. 结论烯烃臭氧化物的形成及其臭氧链异构的反应历程,属游离基型的可能性更大。
The reaction of thermolysis of dibenzyl and phenyl benzyl ether are first Order and can he explained by free radical mechanism. Experimental rate constants are well consistent with the results of thermochemical kinetics CalCulation. 二苯乙烷和苯基苄基醚的热解有一级反应特征,其反应机理为自由基过程,反应速度方程和速度常数的理论计算与实验结果完全一致;
Investigation on Reaction Mechanism of Transition Metal Elements Catalyzing Hydroxyl Free Radical 过渡金属元素催化羟自由基反应机理研究
Superoxide dismutase is a kind of iron enzyme that could catalyze the reaction of superoxide anion free radical, and create oxygen and catalyses. Every kind of living creature has superoxide dismutase. 超氧化物歧化酶是一种能够催化超氧化物阴离子自由基(O~-2)发生歧化反应,生成氧气和过氧化氢,从而清除O~-2的金属酶,它广泛的存在于生物体内。
Reaction of hydroxyl radical with acridine red resulted in decrease of fluorescence intensity and the production of free hydroxyl radical was indirectly determined. 羟自由基与吖啶红发生反应后,吖啶红的荧光强度减弱,测定其荧光强度的变化,可间接测定羟自由基的产生量。
According to carbonyl stress theory of aging, carbonyl-amine reaction as a common reaction of free radical oxidation and non-enzymatic glycosylation is an inevitable and irreversible core process during the slow aging procedure caused by oxidation and glycosylation. 羰基毒害衰老学说指出,羰-氨反应作为自由基氧化和非酶糖基化两大生化反应的兼有反应,是氧化和糖基化造成缓慢生物老化过程的不可避免且大部分不可修复的核心过程。
Study of oxidating mechanism and development of technology about the unsaturated lipoids(ⅱ)& characteristic properties of reaction and development of technology about lipoidic free radical 不饱和油脂氧化机理的研究与技术开发(Ⅱ)&油脂游离基的反应特点与技术开发
The experimental results show that the additive of little phenol or amine substance in the oil product can inhibit the chain reaction of the free radical. 在油品中加入少量酚类或胺类物质能终止自由基链反应;
In DMF tetraethyl ammonium bromide ( TEAB) media, the reduction of irisquinone was two successive single electron processes without the chemical reaction of the free radical semiquinone. 在DMF-四乙基溴化铵(TEAB)质子惰性介质中,马蔺子素连续两步单电子还原生成相应氢醌阴离子,无中间体半醌自由基的化学反应发生。
The mechanism of lithium polymer battery swollen was studied by means of gas chromatography mass spectrum ( GC-MS), VC ( 1,2-divinylene carbonate) was introduced to induce the chain reaction of the free radical to produce the polycarbonate lithium. 采用气相色谱与质谱联机的方法,对聚合物锂离子电池气胀现象的机理进行了研究,引入电解液添加剂VC(1,2-二亚乙烯基碳酸酯)进行自由基链式聚合反应,生成聚烷基碳酸锂化合物。
A new method is narrated in the paper about the synthesis of γ lactone resulted from one step reaction of manganate and olefin combining with carboxylic acid radical cluster. Furthermore, it proposes the mechanism on free radical reaction. 叙述了通过锰盐与烯烃和羧酸基团的反应,一步合成γ-内酯的新方法,并且提出自由基反应机理。
On the basis of these two models and the features of hydrolysis-condensation reaction for the functional groups in various phases in the heterogeneous system, a complete kinetic model of free radical seeded emulsion polymerization with the participation of hydrolysis-condensation reaction was established. 针对功能基团在乳液各相中水解缩合反应的特点,结合自由基种子乳液共聚合的动力学模型,建立了伴有水解缩合反应的自由基种子乳液聚合动力学模型。
A stable hydrographic copolymerizational emulsion is manufactured through the reaction in the same system of the free radical polymerization and the cationic catalysis condensation. 研制成功一种稳定的水性共聚乳液,它是在自由基型聚合和阳离子型催化缩聚的共同体系中反应制得的。
Therefore the reaction rate was faster. The analysis of product composition indicated that reaction followed free radical mechanism including initiation of free radical, its transfer, decomposition and termination. 通过对产物的分析,推断反应遵循自由基机理,反应过程包括自由基的产生、传递、分解和终结。
From the converting ratio, we can know the reaction of NVP-co-HEMA is a typical free radical copolymerization. NVP的共聚属于典型的自由基共聚合反应,其共聚过程中转化率与时间的关系符合自由基共聚的特征。
The result indicates that the reaction of low temperature plasma generates free radicals in the fiber matrix. The intensity of free radical is related with fiber matrix, fine structure, the kinds of plasma gases and the condition of treatment. 结果表明低温等离子体反应在纤维基质中生成自由基,自由基的强度与纤维基质、微观结构、等离子体气体种类以及处理条件有关。
In the first place, based on the domestic traditional industrial large-scale production formula and reaction conditions of adhesive type CR-244, the chloroprene free radical emulsion polymerization was performed by iodoform as the degenerative chain transfer agent to obtain the iodine atom-ended polychloroprene seed latex. 首先,用碘仿作为退化链转移剂,按照传统粘接型CR-244氯丁橡胶大生产配方及反应条件,进行了氯丁二烯的低温乳液聚合,得到一定分子量的聚氯丁二烯(PCP-I)种子乳液。
By establishing the reaction system of DPPH free radical, superoxide anion radical, hydroxyl radical and reducing power, antioxidant activity of Camellia Oleifera Polysaccharide with different doses in vitro was studied and compared with antioxidant activity of VC. 通过四种不同的体系(DPPH自由基、超氧阴离子自由基、羟自由基、还原能力)研究了油茶饼粕多糖的体外抗氧化活性,并与VC的抗氧化性进行了对照。
Antioxidants can prevent or control the above diseases by blocking the chain reaction of oxygen free radical. 而抗氧化物能够切断自由基链反应,抑制机体的自由基损伤,防治上述疾病。
Some scholars believe that the second messenger in the cochlea links to the AmAn ototoxicity, but some argue that glucose transport and its dysmetabolism leads to ototoxicity, or that the adverse reaction of free radical in the cochlea brings lipid peroxidation and finally results in ototoxicity. 有的学者认为耳蜗内的第二信使与AmAn耳毒性有关,也有人认为葡萄糖转运及其代谢障碍导致了耳毒性发生,或认为耳蜗内自由基毒性反应引起了脂质过氧化,最终导致耳毒性。
At last, the possible reaction process of · OH free radical degrading PAM is deduced. 3. 最后推导了·OH自由基降解PAM的可能反应历程。