等离子体聚合制备气体分离膜研究概况

本文叙述了近年来等离子体聚合技术制备气体分离膜,主要是富氧膜的研究进展。着重介绍等离子体聚合制备复合膜的类型及结构、气体透过特性、等离子体反应参数对复合膜气体透过性的影响。     

D4等离子体聚合制备超薄抗磨损膜

在本工作中,利用射频等离子体成功地制备了具有致密、耐腐、绝缘性能的超薄抗磨损膜。用耐磨仪测其硬度,磨损转数已达10000转以上。膜的面电阻率达10~(12)Ω数量级。PPD_4膜耐强酸和几乎所有的有机溶剂。聚合过程主要是由D_4单体的开环和消除甲基基团产生自由基活性点进行的。开环反应对线性聚合物的生成有贡献,甲基消除反应对支化交联聚合物的生成有贡献。PPD_4膜的交联度可由放电功率来调节。     

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。     

等离子体聚合法

扼要介绍等离子体聚合的原理、设备和方法,对其应用也作了叙述。     

等离子体聚合法制备膜蒸馏用疏水微孔复合膜

本文以八氟环丁烷为单体,采用等离子体聚合法将亲水性硝酸纤维素微孔膜改性,制得疏水硝酸纤维素微孔复合膜。所得疏水微孔复合膜可用于膜蒸馏,并具有优良的膜蒸馏性能,其通量达到反渗透水平。利用扫描电镜、X-射线显微分析和XPS等分析手段研究了聚合条件对所得复合膜结构性能的影响.     

等离子体引发聚合的机理初探

等离子体引发聚合与常规自由基聚合存在许多不同之处。本文从等离子体引发聚合物一些现象,如较强的溶剂效应、极高的单体选择性、主成超高分子量聚合物等方面,系统介绍了等离子体引发聚合的机理研究成果,并提出了自己的看法。     

苯胺等离子体聚合及其聚合物结构与性能

应用外部电容耦合式等离子体聚合装置，研究了苯胺等离子体聚合规律，找到了最佳的聚合条件。通过红外光谱、Ｘ射线衍射、电子衍射和接触角测定等研究了聚合物结构与性能。电导率测定表明苯胺等离子体聚合物具有半导体性质。     

等离子体引发聚合

叙述了近下赤等离子体引发聚合反应的研究情况及其在表面改性与合成新型高分子材料等方面的应用。     

等离子体聚合和处理在聚合物改性中的应用

本文综述了等离子聚合和处理在聚合物改性中的应用，介绍并述评了其发展概况。并对高分子等离子体化学在分离膜、保护膜、电子材料、光学材料等领域中的最新应用进行了介绍。     

六甲基二硅胺烷的等离子体聚合

在室温和无添加气体条件下,完成了六甲基二硅胺烷较低功率密度的等寒子体聚合。研究了聚合膜的沉积规律和过程。给出了聚合物膜的结构和性质。得到经验式为 C_(1.42)H_(2.65)N_(0.2)O_(0.15)Si的新聚合物。     

Adhesion Enhancement and Characterization of Plasma Polymerized 1,2-Dichloroethane on Polypropylene Surface

Polypropylene (PP) films were modified in 1,2-dichloroethane (DCE) plasma. Surface energy measurement and rate of deposition showed two-step surface modification. First, incorporation of chloride ions on PP surface followed by deposition of cross-linked layer. DCE plasma modified PP films were subsequently compared with earlier reported work on carbontetrachloride (CCl₄) and chloroform (CHCl₃) plasma modification. Modified films were characterized using ATR-FTIR technique by monitoring the relative changes in intensities of C–H stretch vibrations. The nature of deposition on PP film was characterized using FTIR technique and solubility test. Peel strength measurements of DCE, CCl₄, and CHCl₃ plasma modified films showed improvement in bonding strength. Durability of plasma modified PP film was studied by calculating surface energy and peel strength of samples aged for two months.     

Preparation of Nanostructured Magnetic Films by the Plasma Jet Technique

Summary.  Magnetic films were prepared by the plasma jet technique from Fe, mumetal, and Fe/Hf or Fe/Ta nozzles. Two different plasma jet systems with different vacuum pumps were used to compare the quality of the produced films. The films prepared from a Fe nozzle in the two different equipments shows that oxygen in the residual atmosphere of the low vacuum reactor leads mainly to the formation of iron oxides. The Fe and mumetal films prepared in the high vacuum system contain only a very small amount of oxygen, as proved by chemical analysis and ferromagnetic resonance. The mumetal film, moreover, shows good soft magnetic properties and low magnetic damping. For the reactive plasma jet deposition of nanogranular Fe–Hf–O and Fe–Ta–O films, the low vacuum system was used. The films with higher oxygen content exhibit tunneling-type conductivity. In some films, superparamagnetic behaviour and spin-dependent tunneling magnetoresistance were observed. Received October 5, 2001. Accepted November 22, 2001     

原位聚合沉积聚苯胺薄膜及其电致变色性能

采用原位聚合的方法,以水溶性高分子聚乙烯吡咯烷酮(PVP)为空间稳定剂,直接在玻璃基体表面聚合沉积导电聚苯胺(PANI)薄膜。用扫描电镜(SEM)、紫外可见光谱(UV-Vis)、四探针电导率测试仪和热重分析仪(TG)对聚苯胺膜结构及性能进行了表征。采用循环伏安法测试了薄膜的电致变色性。结果表明:盐酸掺杂聚苯胺薄膜呈翠绿色,薄膜厚115 nm,表面电导率为4.6×10-3S/cm。电致变色实验中聚苯胺电极电位在-6~ 6 V循环变化时,薄膜颜色在黄绿和蓝绿间可逆变化。电致变色前后聚苯胺薄膜的紫外可见吸收光谱表明,随着电极电位的降低,极化子峰发生红移,说明聚苯胺分子链中醌式结构单元被还原,聚苯胺薄膜质子化程度提高。     

Plasma Polymerized Membranes for Isfet's

Abstract

A new type of membrane for ion sensitive field effect transistors (ISFET's) made by plasma polymerization has been proposed for electrode material. Tetrafluoroethylene, chlorobenzene, acetonitrile pure and doped with iodine served as monomers. Some structural features of the plasma polymer membranes are analyzed by ESCA- and IR- methods. Ion sensitivity and long term stability of the membrane are examined.     

正丁胺的等离子体聚合膜性质及氢离子响应功能研究

以正丁胺为单体，采用等离子体聚合法，在盖玻片与玻璃碳及一些金属基片上得到附着性和稳定性均良好的聚合膜，红外光谱，元素分析结果和膜性质研究表明，该聚合具膜具有高度支化，交联的结构，具有良好的耐热和耐腐蚀性，以该膜为敏感材料制成的电位型化学传感器在强酸性溶液中对Ｈ＾＋离子具有超能斯特响应，且稳定性和重现性较好。     

医用聚氯乙烯膜的等离子体表面改性

用两种不同气氛的辉光放电等离子体工艺对医用软质聚氯乙烯（ＰＶＣ）膜进行了表面改性研究。结果表明，聚合性气氛的等离子体改性效果明显优于非聚合性气氛。平整致密的聚合膜对ＰＶＣ增塑剂——邻苯二甲酸二辛酯的迁移和扩散起了阻挡作用，也使膜表面亲水性和表面张力极性成份增大，液固相界面张力减小，生物相容性得以改善。     

Preparation and Refractive Index of Nano BST Thin Films

"Radio frequency magnetron sputtering technique is used to deposit Ba0:65Sr0:35TiO3 (BST) thin films on fused quartz substrates. In order to prepare the high quality BST thin films, the crystallization and microstructure of the films were characterized by X-ray diffraction, field emission scanning electron microscopy and atom force microstructure. The more intense characteristic diffraction peaks and better crystallization can be observed in BST thin films deposited at 600 oC and subsequently annealed at 700 oC. The refractive index of the films is determined from the measured transmission spectra. The dependences of the refractive index on the deposition parameters of BST thin films are different. The refractive index of the films increases with the substrate temperature. At lower sputtering pressure, the refractive index increases from 1.797 to 2.179 with the pressure increase. However, when the pressure increases up to 3.9 Pa, the refractive index instead reduces to 1.860. The oxygen to argon ratio also plays an important effect on the refractive index of the films. It has been found that the refractive index increases with the ratio of oxygen to argon increasing. The refractive index of BST thin films is strongly dependent on the annealing temperature, which also increases as the annealing temperature ascends. In one word, the refractive index of BST thin films is finally affected by the films microstructure and texture."     

SnOx Thin Film Gas Sensors Prepared by Plasma Deposition from Tetrabutyltin

Amorphous ultrafine tin-containing organic thin films have been prepared by means of radio frequency (RF) glow-discharge plasma polymerization of tetrabutyltin (TBT). After being annealed, the films turned into ultrafine SnOx thin films, which possessed high gas sensitivity. The influences of the thermal annealing process on the film's composition, microstructure, and gas sensitivity to such reductive gases as EtOH, H ₂ , CH ₄ , and CO were investigated, and the effects of doping silver into the film on its gas sensitivity were also discussed in detail. By doping with Ag, the sensitivity and selectivity of the film obviously increased, the optimum operating temperature decreased, and the film color apparently changed. Based on these facts, the catalysis mechanism of doped Ag is addressed.