吡咯等离子体聚合及聚合物结构的研究

本文应用外部电容耦合式聚合装置,研究了吡咯等离子体聚合规律,找到了较好的聚合条件。通过元素分析、红外光谱等研究了聚合物的结构,电导率测定表明等离子体聚吡咯具有半导体性质。     

间接等离子体聚合制备聚吡咯薄膜

通过吡咯在氩辉光放电气流下游区域的间接等离子体聚合作用制备了聚吡咯薄膜。研究了聚合膜的沉积速率，用ＦＴＩＲ、ＸＰＳ、ＳＥＭ、ＸＲＤ、ＴＥＤ等手段表征了聚合膜的结构和形态。结果表明，聚合膜完整地保留了吡咯单体的共轭结构，显示出较高的导电性，化学掺杂碘以后膜的室温电导率为１０－７～１０－６Ｓ／ｃｍ。     

α-蒎烯等离子体聚合及其聚合物结构研究

本文应用外部电容耦合式聚合装置,研究了α—蒎烯等离子体聚合规律。通过元素分析,裂解色谱-质谱、红外光谱和接触角测定等方法测定了聚合物的结构和性能。     

应用裂解色谱-质谱法研究乙烯等离子体聚合物结构

应用裂解色谱—质谱(PGC—MS)法研究化学法和等离子体法聚合得到的聚乙烯的裂解行为。比较了两种聚合物的结构差异。探讨了等离子体聚合条件对聚合物结构的影响及其聚合反应机理。     

丙醛的等离子体聚合以及聚合物的结构与性质初探

应用外部电容耦合式等离子体聚合方法,制得了丙醛聚合物,研究了不同的等离子体条件对丙醛的聚合行为的影响。通过元素分析、红外光谱分析、色谱-质谱联合分析、X-射线衍射、润湿性测定等手段研完发现,聚合物为无定形交联结构,表面能为41—45达因/厘米。     

气相色谱-电感耦合等离子体质谱

从接口设计、色谱和质谱技术的应用和实际应用等方面对气相色谱－电感耦合等离子体质谱的进展进行了介绍。     

三氟氯乙烯等离子体聚合气相冷凝物分析

应用等离子体聚合方法可以制备用化学方法难以得到的具有优异性能的聚合物,因此近年来引起国内外学者的重视,并对其聚合机理进行了探讨。但由于等离子体聚合反应的复杂性,至今尚未提出统一的反应机理。其争论的主要问题集中于反应活性中心是自由基还是离子,聚合反应是在气相还是在表面进行。对等离子体聚合过程中的气体产物分析与鉴定,将能对上述问题提供重要的依据。本文报导用色谱(GC),色谱-质谱联用(GC-MS)和顺磁共振(ESR)等方法分离和鉴定     

GC—MS方法测定等离子体引发丙烯酸酯聚合引发活性种

在等离子体引发的液态丙烯酸酯类单体聚合体系中加入大量链转移剂乙硫醇,得到了端基带有引发活性种的低聚物,利用气相色谱-质谱的多离子检测手段,测定了活性种的结构,结果表明:引发活性种是单体在等离子体区裂解生成的酯基碎片[-C—O—R].进而解释了丙烯酸酯类单体可以由等离子体引发聚合,而苯乙烯不能引发聚合的问题.     

高效液相色谱-电感耦合等离子体质谱联用技术在水质分析中的应用

对高效液相色谱-电感耦合等离子体质谱联用技术在水质分析中的应用作了评述,对高效液相色谱-电感耦合等离子体质谱联用技术的发展前景作了展望.引用文献48篇.     

六氟丙烯等离子体聚合机理研究

<正> 在以前的工作中,我们曾应用色谱-质谱(GC-MS)及顺磁共振(ESR)等方法研究了四氟乙烯和三氟氯乙烯等离子体聚合过程中气体冷凝物的组成及结构,提出自由基引发聚合反应机理。本文用类似方法研究六氟丙烯(HFP)等离子体气体冷凝物的组成与结构和冷凝物的ESR信号及其从低温到高温的变化规律,证实了自由基的稳定性并提出气相聚合反应机理。     

Simultaneous determination of pirprofen and its metabolite, the pyrrole derivative, in plasma by high-performance liquid chromatography

A method for the simultaneous determination of pirprofen and its metabolite, the pyrrole derivative, in human plasma is described. The two compounds and the butyric acid analogue of the pyrrole derivative used as internal standard are extracted from plasma with chloroform, then back-extracted into an alkaline buffer. After addition of acid, the aqueous phase is assayed by high-performance liquid chromatography using a fixed-wavelength ultraviolet detector at 254 nm. The limit of quantitation is 0.1 micrograms/ml (0.396 mumol/l for pirprofen and 0.400 mumol/l for the pyrrole derivative).     

Effect of argon plasma treatment on surface-enhanced Raman spectroscopy of polypyrrole deposited on electrochemically roughened gold substrates

In this work, polypyrrole (PPy) films were electrodeposited on electrochemically roughened gold substrates modified by argon plasma treatment. First, a gold substrate was roughened by a triangular-wave oxidation-reduction cycle (ORC) in an aqueous solution containing 0.1 N HCl. Then the roughened gold substrate was further treated by argon plasma. Encouragingly, the surface-enhanced Raman scattering (SERS) spectroscopy of polypyrrole electrodeposited on this roughened gold substrate modified by argon plasma treatment exhibits a higher intensity by 8-fold, as compared with the SERS of PPy electrodeposited on an unmodified roughened gold substrate. Meanwhile, the electropolymerization for pyrrole monomers occurring on the modified roughened gold substrate is easier. Also, the nucleation and growth of electropolymerization of pyrrole monomers on the modified and unmodified gold substrates are different.     

Pyrrole thin films deposited on paper by pulsed RF plasma

Attempts were made to plasma deposit an oriented π-conjugated polymer of pyrrole (Py) on paper surfaces in order to produce electrically conductive layers. The N/C atomic ratio of 0.13–0.24 was observed for all treatment conditions. This implies the nature of the deposition formed on the paper surface via pulsed plasma is different from that of pyrrole monomer. An increase in conductivity of all pyrrole-plasma treated papers was observed. The 50 W RF-power with 5 min plasma exposed paper sample shows 8.15 × 10⁻⁹ S·cm⁻¹ conductivity. The conductivity measurements indicated a plasma-enhanced ring-opening reaction mechanism of pyrrole.      

Stereospecific high-performance liquid chromatographic assay of pirprofen enantiomers in rat plasma and urine.

A stereospecific high-performance liquid chromatographic method was developed for the assay of pirprofen enantiomers in rat plasma and urine. Following addition of internal standard (ketoprofen) and acidifier (L-ascorbic acid) to biological fluids, pirprofen was extracted into an isopropanol-isooctane (5:95) mixture. Diastereomers of pirprofen enantiomers, which were formed using L-leucinamide, were separated on a reversed-phase column with ultraviolet detection at 275 nm using 0.06 M KH2PO4-acetonitrile-triethylamine (64:36:0.1) as mobile phase. The limit of quantitation was 0.1 microgram/ml for each enantiomer, based on 100 microliters of rat plasma. No spontaneous oxidation of pirprofen to its pyrrole metabolite occurred during sample preparation and analysis. In three female rats which were dosed with 10 mg/kg racemic pirprofen orally, plasma concentrations of the enantiomers could be followed for 24 h. Pirprofen enantiomers in plasma were virtually unconjugated, and negligible concentrations of pyrrole metabolites were observed. Less than 10% of the total dose was recovered in urine as intact drug and its glucuroconjugates. The assay was found suitable for the study of the pharmacokinetics of pirprofen enantiomers in the rat.     

The Influence of the Conditioning Procedure on Potentiometric Characteristics of Solid Contact Calcium‐Selective Electrodes in Nanomolar Concentration Solutions

A solid contact calcium‐selective electrode with a poly(pyrrole) intermediate layer doped with the calcium ion‐complexing ligand Tiron was successfully constructed and examined towards the possibility of lowering the detection limit. Two calcium ionophores, ETH 1001 and ETH 129, were compared. A variety of different shapes of potentiometric responses can be obtained in a controlled manner by applying an appropriate conditioning procedure. The lifetime of the investigated electrodes was longer than 1 year. The modified poly(pyrrole) solid contact electrode was compared with the coated wire type. An inductively coupled plasma mass spectrometry with laser ablation analysis (LA ICP MS) was used to confirm the transmembrane ion fluxes.     

Preparation of polymeric composite nanomembranes with conductivity asymmetry

Structure and electrotransport properties of poly(ethylene terephthalate) track membranes modified in pyrrole plasma were studied. Physicochemical aspects of the conductivity asymmetry arising from the contact of two layers with functional groups of different nature and from changes in the pore geometry are discussed.     

Synthesis by plasma and characterization of bilayer aniline–pyrrole thin films doped with iodine

The synthesis by plasma and characterization of aniline–pyrrole bilayer polymers doped in situ with iodine were studied. The objective was to study the electrical conductivity of thin films composed of alternating layers of different polymers. The results indicated that the plasma technique is capable of forming chemically bonded layered polymers with several possible combinations. The electric conductivity was studied during heating–cooling cycles so the dependence of the bilayer polymers on temperature could be observed. The behavior was related with the Arrhenius model, with average activation energies of 0.4 ± 0.1 eV in the heating steps and 0.5 ± 0.1 eV in the cooling steps. The difference in both steps shows the influence of the aniline in the bilayer polymer network because polyaniline presents changes in the structure during heating processes. The bilayer aniline–pyrrole polymers had greater electric conductivity at room temperature than that shown by the separate homopolymers. © 2002 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 40: 1850–1856, 2002     

Plasma Polymers Applied to Chemical Sensing

The paper describes attempts to apply plasma polymers to the development of chemical sensors. The plasma polymers were used as membranes to coat conventional conducting polymer sensors, as stand-alone chemiresistive sensors and as absorbent coatings on quartz crystal microbalances. The plasma polymers were derived from combinations of pyrrole and three silicon containing monomers. In the chemiresistive sensors, conductivity was induced in the polymer matrix by doping with iodine. The paper describes the experimental polymerization conditions, the physical characteristics of the polymers, and the application of the different polymers to sensing common volatile analytes.     

Kinetics of DC Discharge Plasma Polymerization of Hexamethyldisiloxane and Pyrrole

This paper investigates DC plasma polymerization kinetics by combining plasma parameters with film deposition rate in different conditions. The monomers hexamethyldisiloxane (HMDSO) and pyrrole were used. Both single and double Langmuir probes were used to measure the plasma parameters in pulsed power and continuous discharges. In order to avoid probe tip contamination, the probe was heated. Plasma density and electron temperature are reported. The electron current wave form is obtained in pulse power conditions. From the data, a plasma polymerization model is proposed. The conclusion is that the monomer molecules and free radicals adsorbed on the substrate surface react with activated sites produced by high energy ions bombarding the film, resulting in polymerization at the film surface.     

The solvent‐free synthesis of polysubstituted pyrroles by a reusable copper Schiff base complex immobilized on silica coated Fe3O4, and DNA binding study of one resulting derivative as a potential anticancer drug

We demonstrate herein the synthesis of a new copper Schiff base complex immobilized on silica‐coated Fe₃O₄ nanoparticles. The structure and composition of this magnetic nanocatalyst were analyzed using Fourier transform infrared (FT‐IR), X‐ray powder diffraction (XRD), vibrating sample magnetometry (VSM), scanning electron microscopy (SEM), energy dispersive X‐ray (EDX) and inductively coupled plasma atomic emission spectroscopy (ICP‐AES). This nanocomposite was found to be an efficient nanocatalyst for the synthesis of polysubstituted pyrrole derivatives and the products were isolated with high turnover number (TON) and high to excellent yields. Among the new synthesized polysubstituted pyrrole derivatives, we explored the first computational and experimental binding study of methyl 1‐benzyl‐4‐(furan‐2‐yl)‐2‐methyl‐1H‐pyrrole‐3‐carboxylate (SP‐10) with calf thymus deoxyribonucleic acid (ct‐DNA), suggesting their application as potential anticancer activity. In addition, the binding modes of SP‐10 with DNA and human serum albumin (HSA) were verified by molecular docking technique.