磨盘碾磨制备PA6/PP/SBS共混物的结构与性能

采用磨盘形力化学反应器,在室温下制备了PA6/PP超细混合粉体,与SBS共混制得PA6/PP/SBS共混物,测定了材料的力学性能并用TEM研究了材料在不同加工温度下相结构的变化.结果表明,通过固相力化学粉碎制备的PA6/PP混合微粉,改善了PA6与PP和SBS的相容性,促进了PA6及PP的分散和与SBS的相界面结合.在微粉填充量为4%～8%(质量分数)时,材料的拉伸强度大幅度提高,扯断伸长率保持不变.加工温度变化引起材料相结构的变化对材料性能产生显著影响.在PP熔融温度下加工,PP粒子产生粘连形成链状结构,可提高材料的力学性能.     

Effects of coumarin substituents on the photophysical properties of newly synthesised phthalocyanine derivatives

In this study, synthesis of new ligands, 8-hydroxy-3-[p-(3′,4′-dicyanophenoxy)-phenyl]coumarin and 8-hexyloxy-3-[p-(3′,4′-dicyanophenoxy)-phenyl]coumarin, and their phthalocyanines, 2,9,16,23-tetrakis[8-hexyloxy-3-(4-oxyphenyl)coumarin]-metal-free and metallophthalocyanines {M[Pc(OBzCou)₄] (M = 2H, Zn(II), Co(II); Bz: benzene; Cou: coumarin)} were synthesised. The novel chromogenic compounds were characterised by elemental analysis: ¹H NMR, ¹³C NMR, MALDI-TOF, IR and UV–vis spectral data. The effect of coumarin substituents on the photophysical properties of metal-free (H₂Pc) and zinc phthalocyanines (ZnPc) derivatives has been examined. Spectrophotometric measurements revealed that coumarin-substituted ZnPc derivatives were in the unaggregated form, whereas those of H₂Pc species were in aggregated form. It means that substitution of coumarin derivative prevents the cluster formation in the presence of zinc ion in the centre of Pc.     

基于OBE理念的大学化学课程思政案例设计与实践

为更好地服务工程教育专业认证(以下简称工程认证),基于成果导向理念(OBE),重点挖掘工程认证标准涉及到的思政元素,从设计思路、教学目标、导入设计和教学过程等方面进行了大学化学课程思政案例设计与实践。并从过程性考核、专业学习成效、调查问卷和主观描述性反馈等方面对课程思政实施效果进行了评价,结果表明：在OBE理念下,课程思政建设有效地提升了学生的学习成绩、学习兴趣和综合素质,取得了良好的教学效果。     

The Determination of Timolol Maleate Using Silver/Tannic Acid/Titanium Oxide Nanocomposite as an Electrochemical Sensor in Real Samples

Herein, a portable and cost-effective electrochemical sbased on Silver/tannic acid/titanium dioxide/glassy carbon electrode (Ag/TA@ TiO₂/GCE) was fabricated to determine timolol(TM) assay. The Ag/TA@TiO₂/GCE offered an irreversible oxidation peak at +0.99 V, and exhibited an extraordinary electrochemical performance with a wide linear working ranges from 0.01–0.84 and 0.84–49.0 μM and a low detection limit of 5.2 nM. The detection of TM in the presence of interfering agents and real samples was also analyzed. The sensor‘s selectivity was studied by comparing the binding of TM, propranolol, nebivolol, and metoprolol. The developed electrochemical sensing platform could have promising potential for the determination of TM in clinical samples.     

5-烃基-2,3-二甲基吡嗪N-单氧化物的合成

一烃基或二烃基吡嗪的N-单氧化物可以进行氯化、乙酰氧基化等反应,它是重要的有机合成中间体.据报道二烃基吡嗪与30％过氧化氢在醋酸中进行N-氧化反应,当二烃基吡嗪:30％过氧化氢:醋酸的摩尔比为1:2:5、反应温度70～80℃、反应时间8h时,产物是N-单氧化物;当摩尔比为1:4:10、反应温度95℃、反应时间8～24h时,产物是N-二氧     

Cyclobutane-substituted diacetamido sulfides and 2,5-diacylthiophenes

A general and convenient route for the synthesis of 2,5-di[1-methyl-1-arylcyclobutane-3-yl]- thiophenes 4a–c and bis[1-methyl-1-arylcyclobutane-3-yl]-2-(2-oxyethtylamido)thiazole sulfides 7a–c is reported. The characterization of these compounds was obtained by elemental analyses, IR, ¹³C, and ¹H NMR techniques. © 2003 Wiley Periodicals, Inc. 15:26–31, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/.hc10207