POE-g-MAH及其在增韧尼龙6中的应用

利用熔融接枝法制备了马来酸酐接枝乙烯-辛烯共聚物（POE-g—MAH），探讨了各个因素对POE-g—MAH接枝率和熔体流动速率（MFR）的影响，并得出了最佳配方、最佳工艺条件。将POE与接枝产物POE-g—MAH同时作为弹性体改性PA6时，体系的缺口冲击强度较纯尼龙提高近9倍，而其他力学性能改变不大。     

Synthesis of water-soluble single-walled carbon nanotubes by RAFT polymerization

Water-soluble single-walled carbon nanotubes (SWNTs) were synthesized by grafting poly(acrylamide) (PAM) from the surface of SWNT via reversible addition-fragmentation chain transfer (RAFT) polymerization. The RAFT agents were covalently attached to the SWNTs by functionalizing SWNTs with in situ generated diazonium compounds. The product was characterized by means of FT-IR, Raman, ¹H NMR, TGA and TEM. The results showed that PAM chains had successfully grafted from SWNT by RAFT polymerization. The amount of PAM grown from SWNT increased with the polymerization time. The acrylamide conversion increased linearly with the polymerization time, indicating the “living” characteristics of the RAFT polymerization. TEM was utilized to image PAM-g-SWNT, showing relatively uniform polymer coatings present on the surface of individual, debundled nanotubes.     

再结晶法制备高纯超细Al2O3粉的研究

本文介绍了用一种再结晶技术制造高炖、超细Al_2O_3粉体的新方法。 将硫酸铝铵溶液(AA)滴入碳酸氢铵溶液(AHC),经过反应合成一种新的含铝化合物,碳酸氢铝铵(AACH),然后在高温下煅烧,生成超细Al_2O_3粉体。另外还采用了X射线,红外光谱,DTA,以及TEM等手段,研究了反应温度、浓度、PH值和老化条件等对生成物AACH和Al_2O_3的影响。     

Y-TZP/Al_2O_3超细粉末的研究

用共沉淀法制备了3mol％Y_2O_3-ZrO_2-20Wt％Al_2O_3超细粉末。利用热分析、X射线、粒度分析仪、透射电镜和扫描电镜等研究了粉末的性能。实验结果表明:制备的粉末组分均匀,颗粒粒度为10nm,粒度分布窄,团聚体尺寸小,烧结活性高。粉末的相组成为t-ZrO_2。烧结体显微结构致密细晶,具有优异的力学性能。     

Formation of metal fog during molten salt electrolysis observed in a see-through cell

Visual observations of several molten salt electrolysis processes were made in a two-compartment, see-through quartz cell. The electrolyses of aluminium, magnesium, lead, zinc, sodium and potassium were studied. The colour of the melt in the anode compartment was pale yellow for fluoride-chloride melts and red for chloride melts, caused by the presence of dispersed anode gases during electrolysis. In the cathode compartment, streamers of metal fog were formed. The colours of the metal fog were purple for aluminium, grey for magnesium, lead and zinc, blue for sodium and green for potassium.The metal fog tended to sink to the bottom of the cell, which indicated that it had a higher density than that of the melt. The metal fog also penetrated into the anode compartment, probable due to convection and diffusion in the melt. The most probable explanation of the nature of the metal fog is that it consisted ofdispersed metal particles. This chemically unstable phase dissolved easily in the melt and was oxidized quickly by the anode gases.     

DSC and TMDSC study of melting behaviour of poly(butylene succinate) and poly(ethylene succinate)

The subsequent melting behaviour of poly(butylene succinate) (PBSU) and poly(ethylene succinate) (PES) was investigated using DSC and temperature modulated DSC (TMDSC) after they finished nonisothermal crystallization from the melt. PBSU exhibited two melting endotherms in the DSC traces upon heating to the melt, which was ascribed to the melting and recrystallization mechanism. However, one melting endotherm with one shoulder and one crystallization exotherm just prior to the melting endotherm were found for PES. The crystallization exotherm was ascribed to the recrystallization of the melt of the crystallites with low thermal stability, and the shoulder was considered to be the melting endotherm of the crystallites with high thermal stability. The final melting endotherm was ascribed to the melting of the crystallites formed through the reorganization of the crystallites with high thermal stability during the DSC heating process. TMDSC experiments gave the direct evidences to support the proposed models to explain the melting behaviour of PBSU and PES crystallized nonisothermally from the melt.     

浸渍法改性活性炭脱硫(H2S)研究

针对普通脱硫剂的硫容较小的问题，我们利用浸渍液对活性炭进行改性试验。结果表明，用7％的碳酸钠(Na2CO3)溶液作为浸渍液对活性炭改性制得的脱硫剂比普通纯活性炭脱硫剂的硫容提高近30％。试验还考查了浸渍液种类、浸渍液浓度、温度对脱硫效率的影响。     

开发利用校友资源 有效促进大学生就业

校友资源是高校的一种特殊资源和宝贵财富,具有丰富性、潜在性、可持续性和经济性等特性。提出了高校合理开发和充分利用校友资源,有效促进大学生就业的对策。     

Additive-aided electrochemical deposition of bismuth telluride in a basic electrolyte

A new basic electrolyte with two cationic plating additives,polydiaminourea and polyaminosulfone,was investigated for the electrochemical deposition of the bismuth telluride film on a nickel-plated copper foil.Tellurium starts to deposit at a higher potential(-0.35 V) than bismuth(-0.5 V) in this electrolyte.The tellurium-to-bismuth ratio increases while the deposition potential declines from-1 to-1.25 V, indicating a kinetically quicker bismuth deposition at higher potentials.The as-deposited film featu...     

高校图书馆管理模式探讨

提高高校图书馆的管理效益和水平,必须使高校图书馆的管理观念从科学管理转为信息资源管理;管理模式的体制、结构、服务内容、操作以及人员知识结构必须适当改变,以适应信息资源的要求。