用ATRP法构筑核壳型梯度极性的多羟基多臂星状超支化聚合物及聚合物刷——双层聚合物刷的合成与表征

设计并通过原子转移自由基聚合方法 (ATRP)合成了核壳型多羟基多臂星状超支化聚合物刷 .以 2 溴异丁基酰溴封端的超支化聚 (3 乙基 3 羟甲基氧杂环丁烷 ) (HP Br)作为大分子引发剂 ,采用Cu(I)Br和N ,N ,N′ ,N′ ,N″ 五甲基二乙基三胺 (PMDETA)催化体系 ,在丁酮与丙醇的混和溶液中 ,通过甲基丙烯酸羟乙酯(HEMA)的ATRP溶液聚合 ,得到了一系列含有大量羟基的多臂星状超支化聚合物刷 (HP g PHEMA) ,并考察了其羟基的活性 ,发现羟基还可以与苯甲酰氯发生反应 .产物的结构和热性能用1 H NMR、FTIR、GPC、TGA、DSC等进行了表征和测试 .     

吡啶酰胺在Cd(Ⅱ)存在下的醇解反应及结构表征

X-射线晶体结构分析表明,在90℃的水热条件下,N-(8-喹啉基)吡啶-3-酰胺在Cd²⁺的存在下发生醇解。醇解产物为8-氨基喹啉(HL₁)和吡啶-3-羧乙酯(HL₂),它们与Cd(Ⅱ)配位形成四方锥型化合物。该配合物为单斜晶系,空间群P2₁/c,a=18.1089(1)?,b=8.9986(1)?,c=19.3070(2)?,β=113.085(1     

单分散亲水两性离子交换树脂的制备及其在生物大分子分离中的应用

采用分散聚合与溶胀聚合相结合的方法及高分子溶液致孔技术, 成功地制备了粒径为5.0 μm大孔和超大孔结构的单分散亲水性交联聚甲基丙烯酸环氧丙酯树脂, 并进行了结构表征. 将该树脂经胺化后再与1,3-丙磺酸内酯反应, 得到一种新型的两性离子交换(强阳-强阴型)高效液相色谱填料. 研究了该填料对标准蛋白分离性能及流动相中有机溶剂、 流速和pH值对蛋白保留的影响. 实验结果表明, 在流速为3 mL/min时, 采用线性梯度洗脱, 在4.0 min内可同时快速基线分离3种酸性和2种碱性蛋白.     

在位分散聚合聚甲基丙烯酸甲酯/二氧化硅纳米复合材料研究

应用在位分散聚合方法制备了分散相粒径介于１３０ｎｍ左右的聚甲基丙烯酸甲酯／二氧化硅ＰＭＭＡ／ＳｉＯ２纳米复合材料，并利用ＳＥＭ，ＤＭＡ，ＴＧＡ等手段研究了该体系的性能．结果表明，经表面处理的ＳｉＯ２无机填料在复合材料基体中分散均匀，界面粘结好．ＳｉＯ２填充粒子的用量对基体的热稳定性，动态力学行为，光学行为以及拉伸强度，弹性模量，断裂伸长率等力学性能都有较大影响     

Facile cyclic ammonium salt with the smallest size for high performance electric double layer capacitors

A novel cyclic ammonium salt, N,N-dimethylpyrrolidinium tetrafluoroborate (P₁₁-BF₄), was successfully synthesized for the first time. The smallest cyclic structure of P₁₁-BF₄ induced high solubility and conductivity in PC, which can easier enter the micropores of activated carbon and occupy more surface area during charge/discharge process.     

Preparation and characterization of C16 monolithic columns for capillary electrochromatography

A series of methacrylamide-based C16 monolithic columns were prepared and characterized to determine how their porous structural properties and chromatographic behavior are affected by the percentages of functional monomer, base monomer, and cross-linker in the polymerization solution. Baseline separation of 6 neutral compounds can be readily obtained in an optimized column. Furthermore, the effects of organic additive in the mobile phase, operating voltages, and temperature on retention behaviors and separation efficiencies were also studied. The separation mechanism is also discussed. High column efficiency and good reproducibility indicate that the monolithic columns hold considerable promise.     

超声条件下溶胶-凝胶法制备CaSiO_3∶(Pb,Mn)发光材料的研究

采用溶胶-凝胶法并辅以超声技术制备了CaSiO3∶(Pb,Mn)发光材料,对合成物运用荧光光谱、DTA-TG、XRD、FTIR、TEM等手段进行了表征。研究了制备时的物料配比、超声时间及焙烧温度对样品发光强度的影响,找到了最佳的合成条件。结果表明,所得样品其荧光强度约为高温固相法样品的2倍,平均粒径则降低约300 nm。     

Toward breast cancer resistance protein (BCRP) inhibitors: design, synthesis of a series of new simplified fumitremorgin C analogues

In this study, we report the design and synthesis of a series of new simplified fumitremorgin C analogues. The preliminary biological study indicated some of these simplified fumitremorgin C might be developed into breast cancer resistance inhibitors.     

Recent Advances in Rare‐Earth Polypnictides

The polypnictide complexes of rare earth cations have drawn the attention of the scientific community for their uncommon bonding modes and potential applications. Herein, we present a systematic and comprehensive summary on recent advances in the field of rare earth polypnictides, focusing on their synthesis, structures, and reactivities. The structural stabilizing effects imposed by the electropositive rare earth cations as well as the reducing capability of rare earth precursors in the synthesis of these polypnictide complexes are described in this review. We also disscuss in detail the bonding interactions and coordination modes between rare earth cations and polypnictide clusters as well as the similarities and the peculiarity of some structures.     

胺、醇、醚类化合物电离能的自相关拓扑研究

原子的染色序数 fi 定义为 :fi=gi·xi,式中 gi 为原子i在分子中的序数 ,xi 为其染色系数 .基于fi 建立改进的原子序数自相关拓扑指数mF ,其中的1F对烷烃及其衍生物具有良好的结构选择性 .使用第一电离能 (Ip)与0 F ,1F的数量关系模型对 32种脂肪族胺、醇、醚进行估算、预测 ,结果令人满意