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71.
Xiaohui He Yiwang Chen Yongming Liu Shuxian Yu Sanguo Hong Qing Wu 《Journal of polymer science. Part A, Polymer chemistry》2007,45(20):4733-4743
Norbornene polymerizations proceeded in toluene with bis(β‐ketoamino)nickel(II) {Ni[CH3C(O)CHC(NR)CH3]2 [R = phenyl ( 1 ) or naphthyl ( 2 )]} complexes as the catalyst precursors and the organo‐Lewis compound tris(pentafluorophenyl)borane [B(C6F5)3] as a unique cocatalyst. The polymerization conditions, such as the cocatalyst/catalyst ratio (B/Ni), catalyst concentration, monomer/catalyst ratio (norbornene/Ni), polymerization temperature, and polymerization time, were studied in detail. Both bis(β‐ketoamino)nickel(II)/B(C6F5)3 catalytic systems showed noticeably high conversions and activities. The polymerization activities were up to 3.64 × 107 g of polymer/mol of Ni h for complex 1 /(B(C6F5)3 and 3.80 × 107 g of polymer/mol of Ni h for complex 2 /B(C6F5)3, and very high conversions of 90–95% were maintained; both polymerizations provided high‐molecular‐weight polynorbornenes with molecular weight distributions (weight‐average molecular weight/number‐average molecular weight) of 2.5–3.0. The achieved polynorbornenes were confirmed to be vinyl‐addition and atactic polymers through the analysis of Fourier transform infrared, 1H NMR, and 13C NMR spectra, and the thermogravimetric analysis results showed that the polynorbornenes exhibited good thermal stability (decomposition temperature > 410 °C). © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4733–4743, 2007 相似文献
72.
用络合共沉淀法制备了Cu Cr和Cu Cr Zr低温液相合成甲醇催化剂,其比表面积分别达到了77. 9和113. 2m2 /g.在5. 5MPa、383和423K的条件下,用间歇式反应釜考察了催化剂的活性和选择性,并用化学分析的方法测定了反应后溶液中钠化合物含量的变化.结果表明, Cu Cr Zr的活性明显高于Cu Cr,其甲醇的选择性则略有下降;同时,由反应后的钠化合物分析发现, Cu Cr Zr催化体系在423K反应后,溶液中甲酸钠的浓度降低,导致催化体系失活的甲醇钠转化为甲酸钠的反应被彻底抑制. 相似文献
73.
74.
Determination of bisphenol A and naphthols in river water samples by capillary zone electrophoresis after cloud point extraction 总被引:4,自引:0,他引:4
As a first attempt, cloud point extraction (CPE) was developed to preconcentrate bisphenol A (BPA), α-naphthol and β-naphthol prior to performing capillary zone electrophoresis (CZE) analysis. The parameters influencing the CPE efficiency, such as Triton X-114 concentrations, pH value, extraction time and temperature were systematically evaluated.After diluting with acetonitrile, the surfactant-rich phase of CPE can be injected directly into the CE instrument. The CZE baseline separation was achieved with running buffer (pH 9.5) composed of 50 mM sodium tetraborate in 30% (v/v) methanol, and an applied voltage of 25 kV. Under the optimized CPE and CZE conditions, an preconcentration factor of 50 times could be obtained and the limit of quantification for the three analytes were found to be 1.67 μg L−1, 0.80 μg L−1 and 0.67 μg L−1 for BPA, α-naphthol and β-naphthol, respectively. The proposed methods have shown to be a green, rapid and effective approach for determination of three analytes present in river water samples. 相似文献
75.
76.
Mo Hengliang Chen Yongmei Tang Yang Li Tianyu Zhuang Shuxian Wang Linan Yang Xiaojin Wan Pingyu 《Journal of Solid State Electrochemistry》2019,23(5):1571-1579
Journal of Solid State Electrochemistry - Two layers of α-PbO2- and CeO2-doped β-PbO2 were anodically deposited on Ni foam substrate successively, and the prepared... 相似文献
77.
Lu Xiaolei Wang Shuxian Ye Zhengmao Li Chuanhai Cheng Xin 《Journal of Thermal Analysis and Calorimetry》2020,139(2):1007-1016
Journal of Thermal Analysis and Calorimetry - Ettringite (AFt) is a very important hydration product of hardened cement pastes in the early stage. The effect of ethanol-diisopropanolamine (EDIPA)... 相似文献
78.
79.
制备了壳聚糖-g-N-羧甲基-二(2-苯并咪唑)-1,2-乙二醇(CTS-g-N-CBBIE),将其与纯化的纳米金溶胶(NGS)共混得到CTS-g-N-CBBIE-NGS复合物。 以此复合物作为固酶载体固定云芝漆酶,固酶量大(31.10 mg/g),固酶比活力高(1.43 U/mg);此固酶复合物修饰的玻碳电极在无氧磷酸盐-柠檬酸盐缓冲溶液(pH=5.0)中可以实现无中介酶-电极直接电子迁移(一对准可逆氧化还原峰式电位576 mV(vs.Ag/AgCl)对应于漆酶活性中心T1位的氧化还原),电子迁移速率常数为228.3 s-1。 当氧气浓度较小时,这种固酶修饰电极对氧气还原具有一定的生物电催化性能(空气饱和缓冲溶液中氧还原峰电位约为320 mV(vs.Ag/AgCl))。 当氧气浓度增高后,氧还原反应受到抑制;但这种漆酶修饰电极对pH较为敏感,且稳定性和重复使用性欠佳。 相似文献
80.
采用第一性原理,研究三方及六方相FAPbI3(FA=HC(NH2)2+)钙钛矿的结构及光电特性.结果表明,FAPbI3钙钛矿由三方到六方的形变能够扭转PbI3骨架,改变Pb-I键合特性,进而改变其禁带宽度值.两种晶体均属于直接带隙半导体,三方相FAPbI3的直接带隙点位于布里渊区Z(0,0,0.5)对称点,具有较为理想的约1.50 eV的禁带宽度;六方相FAPbI3的直接带隙点位于Γ(0,0,0)对称点,具有约2.50 eV的禁带宽度.FA离子不直接参与电子跃迁过程,仅仅充当电荷供体为PbI3骨架提供超过0.7 e的电荷.相比于六方相晶体,三方相FAPbI3具有更小的载流子有效质量,吸收光谱发生了显著的红移,并且其吸收特性优于六方相FAPbI3和四方相MAPbI3(MA=CH3NH3+)钙钛矿.六方相FAPbI3比三方相晶系更稳定,FA和PbI3骨架之间的结合作用力强于MA和PbI3骨架之间的作用力. 相似文献