Multicompartment Micelles From π-Shaped ABC Block Copolymers

Dissipative particle dynamics simulations were performed on the morphology and structure of multicompartmerit micelles formed from n-shaped ABC block copolymers in water. The influences of chain architectures were studied in a systematic way, and a rich variety of morphologies were observed, such as spherical, wormlike, X-shaped, Y-shaped, ribbon-like, layered rod-like, layered disk-like, as well as network morphologies. The simulations show that the distance between the two grafts plays an important role in control of the morphology. Since n-shaped ABC block copolymers can be reduced to linear ABC and star ABC block copolymers, they are good model copolymers for studying the self-assembly of complex block copolymers into micelles. The knowledge obtained in this work as well as the new morphologies identified provide useful information for future rational design and synthesis of novel multicompartment micelles.     

遥爪型液体共聚物的研究——端乙烯基四氢呋喃-环氧丙烷液体共聚醚与苯乙烯或甲基丙烯酸甲酯共聚体系

<正> 多相高聚物体系是目前广为研究的重要课题。其互容性是研究设计多相高聚物材料的基础。互容性概念源于小分子体系,由于高聚物体系有其特殊性,所以在高聚物互容性研究中,发现完全分子尺度互容的高聚物较少。分子互容性的表征以小角中子散射和低频介电松弛最为有效。但通常用玻璃化转变T_g衡量互溶性。不同测定T_g的方法可得到不同的互容结果。     

新型三官能团脂环族环氧化合物的合成、表征及其阳离子引发光固化活性研究

以双环戊二烯等为原料合成一种新型三官能团液体脂环族环氧树脂. 通过红外光谱、 核磁共振氢谱及质谱等对其中间体及环氧树脂的结构进行了表征. 所得脂环族环氧树脂采用阳离子引发 剂二甲苯基碘鎓六氟磷酸盐引发进行紫外光固化, 对其光固化活性进行了研究, 同时讨论了氧化剂过氧化苯甲酰对该光固化体系的增感作用. 研究结果表明, 新合成的脂环族环氧树脂采用二甲苯基碘鎓六氟磷酸盐引发可以进行光固化, 过氧化苯甲酰明显地加快了其光固化速度, 固化膜具有较好的热稳定性.     

高分子担载水杨醛希夫碱钴配合物催化分子氧氧化环己烯性能研究

合成了聚苯乙烯担载的酪氨酸水杨醛希夫碱钴配合物，并研究了该高分子金属配合物对分子氧氧化环己烯的催化性能．探讨了反应温度、添加剂及反应时间对环己烯转化率和产物选择性的影响．结果表明，70℃时，以微量醋酸为添加剂，在催化剂的催化作用下，以常压氧气氧化环己烯，得到烯丙基位的氧化产物环己烯醇、环己烯酮和中间产物环己烯过氧化氢．催化剂经五次循环使用仍具有较高的催化活性．环己烯在该高分子配合物作用下的催化氧化遵循一个自由基反应历程，与经典的Haber-Weiss历程相一致．     

微乳液电动色谱测定油-水分配系数的改进方法研究

通过考察微乳液电动色谱(MEEKC)中化合物浓度和高电场对其迁移行为的影响, 探讨了化合物分配于微乳后改变微乳内相性质的原因, 以及电泳高电场致使微乳液性质变化的机理. 在此基础上建立了一种测定化合物油-水分配系数的改进型MEEKC方法. 将此改进方法应用于烷基苯化合物之油-水分配系数的测定, 其测定值与文献参考值平均相差0.07个对数单位, 准确度较现行MEEKC方法有了明显提高.     

^31P NMR Studies on the Ligand Dissociation of Trinuclear Molybde-num Cluster Compounds

A series of carboxylate-substituted trinudear molybdenum dus-ter compounds formulated as Mo3S4(DTP)3(RCO2)(L), where RffiH, CH3, C2H5, CH2Cl, CCl3, R^1C6H4(R^1 is the group on the benzene ring of aromatic carboxylate ), L=pyridine,CH3CN, DMF, have been synthesized by the ligand substitu-tion reaction. The dissociation of the loosely-coordinated ligand L from the cluster core was studied by ^31p NMR. The dissocia-tion process of L is related to the solvent, temperature, and acidity of carboxylate groups, so as to affect the solution struc-ture and reactive properties of the duster. The long-distance in-teraction between ligands RCO2 and L is transported by Mo3S4 core.     

溶胶凝胶法制备取向性氧化铝超滤陶瓷膜

用金属醇盐的溶胶-凝胶法在多孔α-Al_2O_3衬底上制备了孔径均一的γ-Al_2O_3超滤膜.经X射线衍射仪、扫描与透射电子显微镜以及静态氮吸附等手段对膜的结构、形貌与孔径大小分布等进行了表征.实验发现顶层膜取向生长,膜厚受浸取时间、溶胶浓度、粘度和实验温度等因素影响.典型条件下可在20mm×20mm衬底上制备孔径均一、大小为3.8～4.8nm和厚度2μm左右的无裂纹、无孔洞等表面缺陷的多孔γ-Al_2O_3陶瓷膜.     

强绿荧光铽－异丁酰基吡唑啉酮配合物的合成、荧光性能及LB膜

强绿荧光铽－异丁酰基吡唑啉酮配合物的合成、荧光性能及ＬＢ膜李琴，周德建，姚光庆，黄春辉Ｓ．ＵｍｅｔａｎｉＭ，Ｍａｔｓｕｉ（北京大学稀土材料化学及应用国家重点实验室，北京，１００８７１）（日本京都大学化学研究所）关键词铽，１－苯基－３－甲基－４－异丁酰...     

三正丁基膦参与的二苯联硒与吖啶及环氧化合物的开环反应

Aziridines and epoxides were reacted with diphenyl diselenide in the presence of a stoichiometric amount of （n-Bu）3P, respectively, giving β-amino- or β-hydroxy selenides in moderate to excellent yields under mild conditions. In the reactions the （n-Bu）3P might act as a reductant though it was a nucleophilic catalyst in other similar ring-opening reactions.     

1-乙基-4-氧-7-甲基-1,8-萘啶-3-羧酸的合成

乙基氧甲基萘啶羧酸;缩合反应;成环反应;乙基化反应;水解反应;光谱特征