TiO2/聚丙烯酸丁酯纳米复合薄膜的制备及结构表征

利用微乳液原位聚合法在普通玻璃表面上制备了TiO2/聚丙烯酸丁酯纳米复合膜.采用傅立叶变换红外光谱、高分辨透射电子显微镜和X射线光电子能谱对膜的结构进行了表征.结果表明， TiO2以纳米线的形式弥散在聚丙烯酸丁酯的高分子网络中，并且所制备的TiO2纳米线具有板钛矿相结构.     

气体分离用PI/TiO2纳米复合膜的制备

聚酰亚胺/TiO2;量子尺寸效应;气体分离器;气体分离用PI/TiO2纳米复合膜的制备     

纳米TiO2/丝素复合膜的制备

探讨了纳米TiO2在丝素溶液中的分散条件,在此基础上制备了纳米TiO2/丝素复合膜,并用原子力显微镜(AFM)和扫描电子能谱(EDS)对复合膜进行了表征。实验结果表明,制膜方法较为合理。当以有机物A为分散剂,纳米TiO2含量为1/1000时,其以粒径50 nm左右均匀地分散于复合膜中。     

纳米TiO2/聚苯胺复合膜电极的制备及其电化学性能

采用1mol·L-1硫酸作为介质,扫描速度为100mV*s-1,扫描电位为-0.2V～0.8V,用循环伏安法在纳米二氧化钛(Nano-TiO2)膜电极上实现了苯胺(Aniline)的电化学聚合,并对制得的Nano-TiO2/聚苯胺复合膜的电化学性质进行了研究.结果表明在峰电位(Ep)为0.28V处有一个明显的氧化峰,在Ep为 0.54V,0.08V,-0.06V处分别有一个还原峰,经长时间扫描,氧化峰电流可达到50mA·cm-2,具有工业应用价值.同时实验也表明,复合膜的生成、Ip的大小受溶液浓度、扫描速度以及扫描电位的影响.     

掺铁TiO2纳米微粒的制备及光催化性能

铁掺杂;苯酚降解;掺铁TiO2纳米微粒的制备及光催化性能     

油酸/PSt/TiO2复合纳米微球的制备

种子聚合;摩擦学性能;油酸/PSt/TiO2复合纳米微球的制备     

银沉积纳米TiO2光催化剂的制备及活性

银沉积纳米TiO2光催化剂的制备及活性;纳米TiO2; 银沉积; 光催化; 甲基橙     

微波加热反应制备纳米TiO2混晶及其光催化性能

微波加热反应制备纳米TiO2混晶及其光催化性能;纳米二氧化钛;混晶;微波加热;光催化性能     

H2O2络合凝胶法制备纳米TiO2/SiO2复合催化剂及其光催化性能

采用H2O2络合凝胶法获得钛的络合物[TiO(H2O2)]2 水溶胶,并与SiO2水溶胶包覆复合,制备了纳米TiO2/SiO2复合半导体催化剂,其结构经XRD和BET表征。以含阳离子艳红染料模拟废水降解为模型反应,考察了复合催化剂的光催化性能。实验结果表明:经650℃焙烧后的复合催化剂中TiO2粒径为9.8 nm,光催化活性最好,SiO2的最佳掺杂量为25%。     

纳米Ni/TiO2粉体的制备及其光催化性能

以四氯化钛为主要原料,通过溶胶法合成了纳米TiO2和Ni/TiO2粉体。研究发现掺杂镍,能够有效延缓锐钛矿型TiO2向金红石型TiO2转变,提高Ni/TiO2粉体的催化活性;在500℃焙烧的Ni/TiO2催化剂,能较好催化溴甲酚绿染料在紫外光下降解。     

Evidence of Branching in Poly(butyl acrylate) Produced in Pulsed‐Laser Polymerization Experiments

Branched poly(butyl acrylate) was obtained from pulsed‐laser polymerizations carried out in bulk and in solution between −16 and 60 °C. The predominantly short branches are formed by backbiting. The Arrhenius temperature dependence of the backbiting rate is calculated, and the activation energy of this process was found to be remarkably higher than that of propagation. Branching thus increases with temperature leading to broader SEC traces and difficulties in the accurate determination of k_p.

Arrhenius plot of k_fp2 versus 1/T determined experimentally.     

Structural Control in Poly(butyl acrylate)-Silica Hybrids by Modifying Polymer-Silica Interactions

Porous organic-inorganic hybrids of poly(n-butyl acrylate) (PBA) and silica were synthesized with different polymer contents via sol-gel process. With the aim of controlling interfacial properties in hybrids, the bonding agent 3-methacryloxypropyl-trimethoxysilane (MPTS) was copolymerized with n-butyl acrylate (BA) at different proportions. Copolymers P(BA-co-MPTS) and hybrids obtained were characterized by infrared spectroscopy and thermogravimetric analysis. Nitrogen sorption analyses of hybrids determined that the increase in polymer content leads to the formation of non-porous hybrids only if bonding agent content is sufficiently large. Otherwise, hybrids with large pore volumes and sizes, nearly reaching macropore range, are obtained even for polymer content as high as 45% in the absence or low content of MPTS. Scanning electron microscopy images showed that the addition of bonding agent changes the aspect of hybrid surface from rough, with loosely bound particles with a few hundreds nanometers, to relatively smooth, with particles typically smaller than 100 nm. These results were explained considering that a more homogeneous medium provided by the presence of MPTS may lead to easier condensation of PBA-silica particles due to the smaller polymeric domains. This idea is supported by the fact that, after polymer degradation, smaller uniform-sized pores arise for hybrids with larger bonding agent contents.     

单分散聚丙烯酸丁酯-二氧化硅核壳粒子的制备

近年来,有机-无机核壳材料因其具有可调的光、电、磁等特性而备受关注．无机物外壳可以增强粒子的热力学稳定性、机械强度和抗拉性能．高分子乳胶粒内核具有弹性,且易成膜,外部包覆无机物的乳胶粒可结合两者特性并产生协同效应．     

Emulsion polymerization of butyl acrylate: Spin trapping and EPR study

The propagating radical in the emulsion polymerization reaction of butyl acrylate was detected by Electron Paramagnetic Resonance (EPR) spectroscopy using two spin-trapping agents, 2-methyl-2-nitrosopropane (MNP) and α-(4-pyridyl 1-oxide)-N-tert-butylnitrone (PyOBN). Through analysis of hyperfine structure of the spectra obtainedfrom the trapped radicals, the propagating radical is inferred to be the well known acrylate radical, ? [CH₂? CH(COOC₄H₉)]_n? CH₂? CH(COOC₄H₉)? . © 1994 John Wiley & Sons, Inc.     

Synthesis by Emulsion Polymerization of Poly(butyl acrylate-co-silver acrylate) Ionomers and Evaluation of their Possible Applications

The synthesis by emulsion polymerization and the characterization by a battery of techniques of poly(butyl acrylate-co-silver acrylate) [poly(BuAc-co-AgAc)] ionomers are reported here. Reaction rates were fast and conversions around 90% were obtained in less than one hour, regardless of the initial ratio of butyl acrylate and silver acrylate employed (BuAc/AgAc = 90/10, 80/20, 70/30). Particle size was in the range of 176 to 200 nm, depending on the BuAc/AgAc ratio. Ionomers’ formation was corroborated by infrared spectroscopy and inferred by differential scanning calorimetry (DSC). DSC disclosed that the poly(BuAc-co-AgAc) has two glass transition temperatures: one at ca. ?49°C due to relaxation of the ionomer backbone domains rich in BuAc and another ca. 35°C due to the relaxation of the backbone domains where the AgAc-units content was higher. Young moduli increased as the copolymers became richer in AgAc. Antibacterial tests against Escherichia coli with the 90/10 (BuAc/AgAc) ionomer revealed that the bacteria population diminishes from 5 log CFU/mL to less than 0.3 MPN/mL after one hour of contact with the ionomers. Also, we demonstrated that the ionomers are excellent compatibilizers for making semiconductive films of n-dodecylbenzene sulfonic acid-doped polyaniline (PANIDBSA)-poly(BuAc-co-AgAc) and poly(n-butyl methacrylate) (PBMA) blends. The electrical conductivity of the blend films, which were homogeneous, rose as the AgAc content in the films increased.     

Novel C60‐Anchored Two‐Armed Poly(tert‐butyl acrylate): Synthesis and Characterization

Summary: A multistep synthetic procedure for preparing novel C₆₀‐anchored two‐armed poly(tert‐butyl acrylate) was developed. First, two‐armed poly(tert‐butyl acrylate) bearing a malonate ester core with well‐controlled molecular weight was synthesized through atom transfer radical polymerization. The effective Bingel reaction between C₆₀ and the well‐defined polymer was then carried out to yield C₆₀‐anchored polymer. GPC, ¹H NMR, and UV‐vis spectroscopy indicated that the C₆₀‐anchored polymer was a monosubstituted and ‘closed’ 6,6‐ring‐bridged methanofullerene derivative.

Schematic of a novel C₆₀‐anchored two‐armed polymer.     

Synthesis,Characterization and Application of Amphiphilic Copolymer Poly(vinyl alcohol)-g-Poly(butyl acrylate)

An amphiphilic graft copolymer poly(vinyl alcohol)-g-poly(butyl acrylate) (PVA-g-PBA) was synthesized by grafting butyl acrylate (BA) onto poly(vinyl alcohol) (PVA) with potassium persulfate (KPS) as free radical initiator in N₂ atmosphere and aqueous medium. The formation of graft copolymer was confirmed by means of infrared spectroscopy (IR). The influences of initiator, monomer concentration and reaction time on the percentage of monomer conversion(C _M), graft degree(Gd) and graft efficiency(Ge) have been discussed in detail. PVA-g-PBA was used as compatibilizer in blends of chlorinated polyethylene (CPE)/ poly(acrylic acid-co-acrylamide)[P(AA-AM)], and the compatibility between CPE and P(AA-AM) was also investigated.     

Graft copolymerization of butyl acrylate and 2‐ethyl hexyl acrylate from labile chlorines of poly(vinyl chloride) by atom transfer radical polymerization

Trace amounts of labile chlorines present in poly(vinyl chloride) (PVC) were found to act as initiation sites for the preparation of graft copolymers of PVC by copper‐mediated atom transfer radical polymerization (ATRP). High grafting yields were attained during the graft copolymerizations of n‐butyl acrylate (161.8%) and 2‐ethyl hexyl acrylate (51.2%) in 7.5 h. In both cases, the grafting proceeded with first‐order kinetics with respect to the monomer concentrations, this being typical for ATRP. Gel permeation chromatography traces of the resulting products did not exhibit additional peaks attributable to the formation of free homopolymers. The presented procedure offers an efficient means of preparing self‐plasticized PVC structures. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 3457–3462, 2003     

仿贝壳结构的自组装纳米复合薄膜的制备、表征及摩擦学性能研究

利用超分子自组装方法在普通玻璃表面制备了仿贝壳有机-无机复合纳米薄膜 。采用X射线衍射仪、傅立叶红外光谱仪、X射线光电子能谱仪及透射电子显微镜等 对薄膜结构进行了表征。用动-静摩擦系数测定仪初步考察了其摩擦行为。结果表 明,这种薄膜具有机-无机有序交替的层状纳米复合结构,其聚合前的层间距为4. 20 nm, 聚合后的层间距为3.91 nm。聚合后的仿贝壳自组装纳米复合薄膜具有良好 的减摩性能。