基于柱芳烃、环对苯撑等大环主体的白光发射体系在超分子化学领域占据着重要作用。我们设计了一种基于二四苯乙烯–咔唑和N-萘二酸酐的D-π-A型客体分子(TCPN),通过主客体相互作用将其与柱[5]芳烃(P5)、[10]环对苯撑([10]CPP)和[12]环对苯撑([12]CPP)进行自组装,可以构建多组分超分子动态白光发射体系。在该体系中,发射黄色荧光的TCPN和P5的混合物与绿色荧光的[10]CPP以及蓝色荧光的[12]CPP按照特定比例进行组合。这种独特的组合方式不仅可以实现从单色荧光到白光发射的高效转换,还赋予了整个体系优异的动态可调荧光发射特性。Supramolecular systems based on macrocyclic hosts such as pillar[n]arenes and cycloparaphenylenes play an important role in the field of supramolecular chemistry for their white-light emission. We designed a D-π-A type guest molecule (TCPN) based on 1,4-bis(anthracen-9-yl)benzene and N-naphthalic anhydride. Through host-guest interactions, we assembled it with pillar[5]arene (P5), [10]cycloparaphenylene ([10]CPP), and [12]cycloparaphenylene ([12]CPP) to construct a multicomponent supramolecular dynamic white-light-emitting system. In this system, the mixture of TCPN and P5, which emits yellow fluorescence, combined with [10]CPP that emits green fluorescence and [12]CPP that emits blue fluorescence in a specific proportion, can achieve efficient conversion from monochromatic fluorescence to white light emission based on the condition of solvent evaporation, demonstrating excellent dynamically tunable fluorescent emission characteristics.
合成酯类基础油三羟甲基丙烷油酸酯(TMPTO)具有优异的润滑性能和多种优异特质,广泛应用于环保液压油、发动机油等抗燃液压油中。为提高TMPTO在复杂工况下的润滑性能,并实现添加工艺简便、成本低廉、合成方法绿色,本研究利用酯化反应合成了两种常用的润滑油添加剂1,6-己二异氰酸酯(HDI)和丙烯酸-2-羟乙酯(HEA)的半封端产物(HDI-HEA),通过化学接枝在石墨烯及其衍生物的表面,制备出了多种功能化改性石墨烯添加剂,其中功能化改性石墨烯(G-HDI-HEA)可作为TMPTO的最佳润滑油添加剂。通过FTIR、XRD、SEM、TEM、Raman、XPS等表征分析证实HDI-HEA成功接枝到石墨烯表面。为了验证不同G-HDI-HEA含量的改良基础润滑油(G-HDI-HEA/TMPTO)的润滑性能,通过四球摩擦试验机测试磨斑直径、摩擦系数确定G-HDI-HEA对TMPTO摩擦性能的影响。结果表明:先合成HDI-HEA后接枝石墨烯的方法可以避免HDI上两个NCO同时连接一个或多个石墨烯,提高石墨烯的扩散性能的同时也减少了石墨烯的团聚。由于采用的一锅串联法无需催化剂,可以减少大量成本和复杂的后处理。当G-HDI-HEA的含量为0.01%时,G-HDI-HEA/TMPTO的磨斑直径减小约27%,最大润滑系数降低10%。Synthetic ester base oil trimethylolpropane oleate (TMPTO) has excellent lubrication performance and various outstanding characteristics, and is widely used in environmentally friendly hydraulic oils, engine oils, and other fire-resistant hydraulic oils. To improve the lubrication performance of TMPTO base oil under complex working conditions, and to achieve simple addition process, low cost, and green synthesis method. This work utilized a catalyst free esterification reaction to connect two commonly used lubricant additives, 1,6-hexanedioic acid (HDI) and 2-hydroxyethyl acrylate (HEA), into a half sealed end product (HDI-HEA), which was grafted onto the surface of graphene and its derivatives to prepare various fun
