3-丙烯酰胺基-9-乙基咔唑/碘鎓盐体系敏化甲基丙烯酸甲酯光聚合

研究了 3_丙烯酰胺基_9_乙基咔唑 (AAECZ) /氯化二苯基碘钅翁盐 (DPIOC)组成的光敏引发体系引发的甲基丙烯酸甲酯 (MMA)光聚合 ,并研究了各因素对聚合速率的影响 ,得到了聚合动力学方程 ;讨论了温度对聚合反应的影响 ,并探讨了引发机理     

3-芳甲酰基香豆素类化合物光引发聚合的研究

<正> 近年来,3-芳甲酰基香豆素类化合物,作为有效的用于高分子光引发交联的光敏剂和光共引发剂已受到重视,Williams等曾对这类化合物在高分子薄膜中的聚合能力进行了研究,认为其作为光敏剂效果甚佳。本文研究了光敏剂(scn.1)-三乙胺(TEA)体系引发甲基丙烯酸甲酯(MMA)的光聚合,通过与二苯酮(BP)-TEA体系比较,指出了前者具有更高的引发效率,并从光引发聚合体系中光敏剂的激发态性质揭示了这一过程     

N-甲基-N-(2-甲基丙烯酰氧乙基)-对-甲苯胺对甲基丙烯酸甲酯聚合的影响

<正> 我们曾报道可聚合的芳叔胺N-甲基-N-(2-甲基丙烯酰氧乙基)苯胺(MEMA)与有机过氧化物如过氧化二苯甲酰(BPO)、过氧化二月桂酰(LPO)组成氧化还原引发体系用于甲基丙烯酸甲酯的聚合。虽然文献报道了N-甲基-N-(2-甲基丙烯酰氧乙基)-对-甲苯胺(MEMT)的合成,但没有研究它对甲基丙烯酸甲酯自由基聚合的影响。本文研究了MEMT对BPO或LPO引发MMA聚合的影响,从聚合动力学研究表明BPO/MEMT组成氧化还原引发体系。其引发机理与BPO/MEMA很相似。     

哌嗪-二氧化硫电荷转移复合物引发的甲基丙烯酸甲酯光聚合

本文研究了哌嗪 (PPZ)与二氧化硫 (SO2 )电荷转移复合物 (CTC)的制备及其作为光引发剂引发甲基丙烯酸甲酯 (MMA)的聚合 ,发现PPZ/SO2 摩尔比对聚合速率影响甚大 .当PPZ/SO2 为 1∶2时 ,形成了具有潜在引发能力的复合物 (Ⅰ ) .Ⅰ引发MMA光聚合的动力学关系式为Rp =Kp [Ⅰ ] 0 .34[MMA] 1.0 6 ,表观活化能为 2 3 7kJ/mol.并对引发机理进行了探讨     

有机过氧化氢物与芳叔胺体系引发甲基丙烯酸甲酯聚合的研究

以有机过氧化氢物叔丁基过氧化氢(TBH)或异丙苯过氧化氢(CHP)与芳叔胺N,N-二甲基苯胺(DMA)或其衍生物组成的体系引发甲基丙烯酸甲酯(MMA)聚合。研究有机过氧化氢物与芳叔胺结构对聚合的影响,测定了TBH-胺与CHP-胺体系引发MMA聚合的总活化能分别为50-57KJ/mol与39-62KJ/mol,并对CHP-DMT(N,N-二甲基对甲苯胺)引发MMA聚合动力学以及有关引发聚合机理进行了研究。     

香豆素染料与羟基苯基碘鎓盐光敏引发体系的研究

本文通过吸收光谱、荧光猝灭、光聚合方法对羟基苯基碘盐(HTIB)的光敏引发体系进行了研究,发现具有给电子性的光敏剂香豆素1可以将引发剂羟基苯基碘盐的光响应移到长波区,而引发聚合效率与溶剂的性质有很大的关系.在一般极性溶剂中如DMSO中能有效地引发甲基丙烯酸甲酯(MMA)光聚合,而在电子受体性质的极性溶剂如乙腈中,光聚合反应受阻,这归结于香豆素1与羟基苯基碘盐形成络合物,使得光反应后生成不具活性的产物.该结果对研究其它单苯基碘盐的光敏体系提供了有价值的信息.     

可见光敏引发聚合甲基丙烯酸甲酯的动力学研究

本论文用膨胀计法进行了甲基丙烯酸甲酯在氯仿溶液中可见光光敏引发聚合动力学的研究。此光敏引发体系由光敏剂1,3,3-三甲基-2-[5-(1,3,3-三甲基-2-吲哚叉)-1,3-戊二烯]吲哚碘盐(简称NK-529),引发剂邻氯代六芳基双咪唑(简称o-Cl-HABI),氢给体3-巯基-4-甲基-4氢-1,2,4-三氮唑(简称MTA)组成。研究结果表明,此光敏聚合体系的光聚合速率与各组分的动力学方程如下:R_p=K(NK-529)^0.51(HABI)^0.41(MTA)^0.36(MMA)^1.0.     

双咪唑光敏体系紫外光引发聚合甲基丙烯酸甲酯动力学和应用研究

用光敏剂4,4′ 二(N,N′ 二甲基-氨基)苯甲酮(简称米氏酮,MK)、引发剂邻氯代六芳基双咪唑(o-Cl-HABI)和氢给体助引发剂十二烷基硫醇(SH)组成光敏引发体系。研究了在高压汞灯照射下,甲基丙烯酸甲酯(MMA)光聚合速率和该敏化体系每一个组分,包括MK、o-Cl-HABI、SH和MMA的关系,还研究了该体系在PS版材上的应用,并获得了很好的效果。     

含胺基功能性单体的聚合研究 Ⅴ.4-N,N-二甲胺基苯乙烯的合成及其作为氧化还原引发体系组分的研究

<正> 前文我们报告了含有芳香叔胺基的丙烯酸酯、甲基丙烯酸-4-N,N-二甲氨基苄酯(DMABMA)在过氧化二月桂酰(LPO)引发下的聚合动力学。从所得的聚合速度方程式及低的聚合活化能,认为DMABMA与LPO形成氧化还原体系而使DMABMA聚合,在本文第Ⅳ报中报道了DMABMA不仅能引发甲基丙烯酸甲酯的聚合,还参与聚甲基丙烯酸甲酯的链中,因此称这种既能参与引发聚合反应,又参与聚合物链中的引发“引发剂单体(initiatomer)”。这种含有可聚合胺引发体系的优点是,用于丙烯酸酯类医用     

含氧光敏引发体系的研究——Ⅵ.二苯酮/三乙胺体系引发光聚合过程中的再次引发效应

过去,作者曾发表了多种光敏引发体系引发烯类单体光聚合的工作,在研究2,2-二甲氧基苯乙酮在氧存在下引发甲基丙烯酸甲酯光聚合时,结合在聚合物链端的引发剂碎片具有光化学活性,在光聚合反应中产生高分子自由基,发生再次聚合,出现高分子量     

Ethanol loading in an inductively coupled plasma

Changes to the fundamental and analytical parameters of a plasma have been investigated when ethanol has been added to aqueous or organic solutions. Excitation temperature, electron number density, and intensity of the H(alpha) line increased when ethanol has been added to aqueous solutions, while an electron density decrease and signal reduction have been found when ethanol has been added to xylene. The sensitivity has been improved for all ethanol concentrations when water has been the solvent, but the reverse has been found for xylene solutions.     

对络合返滴定过程的理论探讨

推导了络合返滴定曲线方程 ,绘制了络合返滴定曲线和计算了pN突跃。并利用双曲正弦函数的性质 ,提出了内含最大敏锐指数的络合返滴定误差计算公式 ,从而获得了计算络合返滴定pN突跃范围的公式。     

Ionization probability of the hydrogen atom suddenly released from confinement

The problem of the stability of a confined atom when it is extracted from the confining cavity has been investigated, modeled by a spherical hard wall potential. The ionization probability when the atom is released from confinement has been obtained. The dependence of the ionization probability on the confinement radius and on the quantum numbers of the initial confined state has been studied. The probability density function of the ionization energy of the ejected electron has been obtained for the different cases considered. The oscillatory structure of this distribution function, with a principal maximum located in the neighborhood of the energy of the initial state and minima very close to zero has been elucidated. The sudden approximation has been applied and the analytic continuation method has been used to calculate the different stationary states.     

Action of trypsin on a nucleoprotein from sturgeon gonads

A nucleoprotein has been isolated from the gonads of the Caspian sturgeon and its composition has been determined. It has been shown that it contains 55% of DNA, 2% of RNA, 36% of protamines, and about 7% of nonprotamine proteins of nonbasic nature. The nucleoprotein has been hydrolyzed with trypsin, and the amino acid compositions of some hydrolysis products have been studied. On the basis of the results obtained, the hypothesis has been put forward of a possible linkage of the DNA with the basic proteins. It has been shown that protamines react with the DNA through the basic amino acid residues located at various regions of their molecules.     

Polymers from 12-hydroxymethyltetrahydroabietic acid and its vinyl and acrylate esters

12-Hydroxymethyltetrahydroabietic acid has been homopolymerized by melt condensation and homopolyester has been obtained. Vinyl 12-hydroxymethyltetrahydroabietate has been prepared from 12-hydroxymethyltetrahydroabietic acid by vinyl interchange procedure with vinyl acetate, and has been homopolymerized, copolymerized with vinyl chloride, vinyl acetate, and terpolymerized with styrene and acrylonitrile. The acrylate ester of 12-hydroxymethyltetrahydroabietic acid also has been prepared from 12-hydroxymethyltetrahydroabietic acid and acrylyl chloride. The acrylate thus obtained has been homopolymerized and copolymerized with vinyl chloride and vinyl acetate. Polymers thus obtained have been characterized.     

Ethanol loading in an inductively coupled plasma

Changes to the fundamental and analytical parameters of a plasma have been investigated when ethanol has been added to aqueous or organic solutions. Excitation temperature, electron number density, and intensity of the H line increased when ethanol has been added to aqueous solutions, while an electron density decrease and signal reduction have been found when ethanol has been added to xylene. The sensitivity has been improved for all ethanol concentrations when water has been the solvent, but the reverse has been found for xylene solutions.     

Jahn-Teller畸变后D2h C60--的电子结构和光谱

用INDO系列方法对C60自由基负离子进行了几何构型优化,得到D2h对称性的构型,表明C60--确实发生了Jahn-Teller畸变,导致单键变短,双键变长,形成15种键,9种不等同碳原子,其额外负电荷主要分布在赤道附近。以此构型为基础,计算了C60--的电子光谱,与实验值吻合,在对光谱进行理论指认的同时讨论了光谱红移的原因。     

Viscoelastic response of elastomers in large deformations

A simple nonlinear theory of viscoelasticity has been developed for application to elastomers. The interpretation of nonlinear viscoelastic responses based on Gibbs-DiMarzio theory has been identified at a molecular level and hence structural understanding has been established. The introduced model is applied to strain imposed conditions. From this, a relaxation process has been revealed for the resultant stress, where a dependence of relaxation time on the state of strain has been established.     

Effect of the intercalated cation on the properties of poly(o-methylaniline)/maghnite clay nanocomposites

A detailed study about the synthesis, characterization and properties of poly(o-methylaniline)(PoMea)/maghnite nanocomposites has been performed. Changes in the characteristics of the nanocomposites, depending on the intercalated cation between the clay layers before the synthesis, have been observed. Intercalated morphology has been detected by TEM in nanocomposites containing copper-treated maghnite (Magh-Cu), while when maghnite treated with strong acids was used (Magh-H); an exfoliated material has been obtained. Also, remarkable differences in the properties of the polymers have been observed by TG-MS and FTIR, suggesting that the polymer produced with Magh-H has a higher degree of branching. The electrochemical behavior of the polymers extracted from the nanocomposites has been studied by cyclic voltammetry. Good electrochemical response has been observed for PoMea grown into Magh-Cu but not for the one polymerized into Magh-H.     

贵金属Au冷却过程中结构及能量变化的分子动力学计算机模拟

通过分子动力学方法,研究了不同冷速下贵金属Au在温度2000～300K的冷却过程中微观结构的变化特点。结果发现,冷却速度对Au的微观结构产生重要影响。采用偶关联函数和键对分析技术对原子局域团簇结构进行分析,并考察了冷却过程中原子势能随温度的变化,比较了Au的微观结构转变与能量变化的对应关系,从能量转化的角度对冷却过程中Au的结构变化进行了说明。