C60H18, C60H36 and C70H36 Fullerene Hydrides: Study by Methods of IR,NMR, XPS,EELS and Magnetochemistry

Abstract

Fullerene hydrides of C₆₀H₁₈, C₆₀H₃₆ and C₇₀H₃₆ are studied by using IR, ¹H and ¹³C NMR, X-ray photoelectron and electron energy loss spectroscopies, and magnetochemistry. The comparison of IR and solid state ¹H and ¹³C NMR data for C₆₀H₃₆ with the theoretical ones allows the suggestion that fullerene hydride has a T symmetric structure and contains 4 isolated benzenoid rings located at tetrahedral positions on the surface of a closed skeleton of the molecule. The EELS revealed that the transition from fullerene to the hydride is accompanied by the decrease of the density of valence electrons. Magnetization measurements showed C₆₀H₃₆ to be a ferromagnet. The hydrogenated fullerenes were prepared by transfer hydrogenation procedures involving 9,10-dihydroanthracene. The compositions of the hydrides are determined by field desorption mass-spectral analysis.     

基于MMA7455的抽油机加速度信息采集系统

文章提出一种基下MMA7455的抽油机加速度采集系统的设计,由于井场环境复杂,干扰信号较多,文章采用硬件滤波和算法滤波相结合的方式,较大程度地抑制井场的噪声干扰.测量的加速度再经过双重积分,得到位移,进而得到抽油机每次的冲程.     

基于ARM9的自由摆平板控制系统设计

介绍了自由摆平板控制系统的设计及实现。其硬件系统主要包括S3C2440嵌入式最小系统、步进电机驱动器、输入及显示、传感器系统4个部分。软件部分实现传感器数据采集、步进电机控制、控制算法实现及整体系统协调。通过对软硬件的整体调试使系统达到设计要求,性能优越。     

CC2420和MMA7260的无线传感器数据采集系统

简要介绍了ZigBee技术协议以及CC2420和MMA7260的性能和特点,设计了一种基于CC2420和MMA7260的无线传感器数据采集系统,给出了具体的软、硬件设计方法以及实际测试结果。该系统选用高灵敏度的三轴加速度传感器芯片MMA7260来采集机构的振动加速度信号,再通过支持ZigBee无线传输协议的CC2420把数据发送给接收装置。     

Modification in Surface Chemistry of the Polyetrafluoroethylene Through Chemical Graft Copolymerization for Potential Oil Contamination Control

In the present study, an attempt has been made to design an oleophobic surface through chemical graft copolymerization of methyl methacrylate (MMA) onto polytetrafluroethylene (PTFE) film. The PTFE films were grafted with MMA resulting in PTFE-g-MMA grafts using benzoyl peroxide (BPO) as initiator in aqueous media. Optimum conditions pertaining to maximum percentage of grafting were evaluated by varying time, temperature, initiator, and monomer concentration. The maximum graft yield 9.47% was obtained at [BPO] = 0.03 M, [MMA] = 10%V/V, [reaction temperature] = 50°C and [reaction time] = 120 min. Methyl iodide was used to measure the contact angle, which revealed the oleophobic nature of grafted PTFE-g-MMA film. Maximum contact angle 95.5° of PTFE-g-MMA film was observed at optimum grafting conditions. The surface morphology of PTFE-g-MMA films was studied by Field emission scanning electron microscopy (FE-SEM) and x-ray diffraction (XRD) analysis confirmed the change in structure of PTFE after MMA grafting.     

反相微乳液模板原位聚合制备和表征纳米AgCl/PMMA复合材料

用甲基丙烯酸甲酯（MMA）作油相，反相微乳液作为模板制备了纳米氯化银（AgCl）粒子，再进行原位聚合制备了纳米AgCl/PMMA复合材料。用电导法表征了微乳液的结构。分析了温度对微乳液稳定性的影响；TEM分析表明，纳米AgCl的尺寸小于100nm,SEM及红外分析表明纳米AgCl粒子是均匀地存在于PMMA基材中，MMA聚合完全；动态力学测试（DMTA）复合材料发现纳米AgCl粒子起到“交联剂”作用，使复合材料的储能模量上升。     

Water sorption and desorption in 2-hydroxyethylmethacrylate/methylmethacrylate copolymers

Cross-linked copolymers of 2-hydroxyethylmethacrylate/methylmethacrylate HEMA/MMA) with different HEMA contents have been prepared. Water sorption and desorption kinetics have been studied at a temperature of 37°C. The results indicate that the rate controlling step of sorption and desorption is the Fickian diffusion in the swollen polymer. The diffusion coefficient is a function of the water concentration and decreases to zero below a critical value of water content, which depends on the HEMA content.     

甲基丙烯酸甲酯/丙烯酸羟乙基酯/(SDS/W)微乳体系的研究

甲基丙烯酸甲酯 (MMA) /丙烯酸羟乙酯 (HEA) /十二烷基磺酸钠水溶液 (SDS/W )能够在很宽的浓度范围内形成稳定的微乳体系 ,且在不同条件下体系分别以W /O、O/W、双连续型微乳液存在。通过相图的测绘、电导率及粘度的测量和透射电子显微镜观察 ,对该体系进行了研究和表征。     

微波辐照下甲基丙烯酸甲酯（MMA）聚合的研究

本文研究在微波辐照下甲基丙烯酸甲脂（ＭＭＡ）在低转化阶段的聚合特征，实验给出在微波辐照下ＭＭＡ的聚合速率有显著的提高，回归分析给出了ＭＭＡ在微波辐照下的聚合模拟动力学方程。