精细化工实验课程教学改革与实践:可陶瓷化阻燃EVA复合材料的制备与性能研究*

结合科研课题及实验教学经验,设计了题为“可陶瓷化阻燃EVA复合材料的制备与性能研究”的精细化工实验课教学项目。该实验以乙烯-醋酸乙烯酯共聚物(EVA)为基材,以叶腊石粉(PL)和磷酸盐玻璃粉(GD)为陶瓷化填料(CF),以有机蒙脱土(OMMT)为抗熔滴剂,以三聚氰胺氰尿酸盐(MCA)为阻燃剂,制备可陶瓷化阻燃EVA复合材料。实验优化了影响阻燃效果、陶瓷强度和复合材料力学性能的因素,确定了合适的配方组成等内容。本精细化工实验课结合了科研内容,能激发学生主动参与实验设计并自主探索科学的兴趣,有利于培养学生的创新能力和解决实际问题的能力。     

高效液相色谱法同时测定氧化型染发产品中33种染发剂

建立了高效液相色谱同时测定氧化型染发产品中33种禁限用染发剂含量的分析方法。采用Waters Atlantis^® T3 MV Kit色谱柱（250 mm×4.6 mm，5 μm），以磷酸盐缓冲液-乙腈为流动相，梯度洗脱，流速为1.0 mL/min，柱温为25℃；采用二极管阵列检测器（DAD），检测波长为235及280 nm，进样量为5 μL。结果表明，各成分在线性范围内线性关系良好，相关系数均高于0.999，各成分精密度实验相对标准偏差（RSDs）均小于2%；四氨基嘧啶硫酸盐和2，4-二氨基苯氧基乙醇盐酸盐在12 h内稳定性实验RSDs小于5%，其余31种成分在24 h内稳定性实验RSDs均小于5%；各成分在3个浓度水平下的加标回收率为77.6%~116.3%。该方法简便、快速、准确，适用于氧化型染发产品中多种染发剂的检测。     

正常组织和胰腺癌组织中差异表达蛋白的鉴定

采用双向凝胶电泳和生物质谱技术, 对12对胰腺癌组织和癌旁组织样品、3个胰腺良性疾病样品、3个正常胰腺组织样品的蛋白质进行了分离和鉴定, 获得了重复性较好的双向凝胶电泳图谱; 鉴定了胰腺癌和癌旁组织的差异表达蛋白质, 发现了30个差异表达蛋白质; 应用MALDI-TOF-MS/MS技术对差异表达蛋白质进行鉴定, 共有24个蛋白质得到鉴定, 其中15个蛋白质在胰腺癌组织中表达上调, 9个蛋白质表达下调. 这些蛋白质与胰腺癌的发生相关, 可能成为胰腺癌的分子标志物和药物治疗的靶蛋白.     

Detection and Theoretical Study of Fukui Function of Nitroaromatics by Carbazole-Based Iridium（Ⅲ）Phosphorescent Probe北大核心CSCD

A room temperature phosphorescent Ir（Ⅲ）complex Ir（ppyCz）3 is synthesized by a two-step synthesis method with a carbazole modified organic ligand. The high-efficiency luminescent detection strategy of six familiar nitroaromatics including 1,3-dinitrobenzene,etc. is developed using Ir（ppyCz）3 as the luminescent probe. The highest detection efficiency of 1,3-dinitrobenzene by Ir（ppyCz）3 is demonstrated with the quenching content KSV of（26. 38±1. 05）L/mmol,and minimum detection limit of 2. 50×10−6 mmol/L. Density functional theory calculations and spectral overlap experiments show that the detection mechanism of Ir（ppyCz）3 for the six nitroaromatics is assigned to electron transfer. The sequence of the orbital weighted Fukui function for the six nitroaromatics dovetails with the corresponding detection efficiency sequence of nitroaromatics by Ir（ppyCz）3. © 2022, Science Press (China). All rights reserved.     

THE SIZE OF FARSIGHTED STABLE COALITIONS IN A GAME OF POLLUTION ABATEMENT

Abstract The game theoretical analysis of international environmental problems has received increasing attention in recent years. Major issues are as follows. Under which conditions will an international environmental agreement (IEA) be signed? Will the agreement be stable? Game theory has given different answers to these questions; in particular, it is possible to show that if countries are myopic then only small stable coalitions occur, but if they are farsighted then both large and small stable coalitions exist. This paper studies the size of a farsighted stable IEA by considering a quadratic cost function in a pollution abatement model. Following Rubio and Ulph [2006] , we consider both the case of non‐negative emissions as well as the case of unrestricted ones.     

木粉/聚乙烯复合材料的等离子体表面处理——等离子体处理时间对复合材料表面特性的影响

为改善木粉/聚乙烯复合材料的表面粘接性,实现木粉/聚乙烯复合材料的无缝连接,利用低温等离子体处理技术,对木粉/聚乙烯复合材料进行了表面处理.采用接触角测试、傅立叶变换红外光谱分析(FTIR)以及X射线光电子能谱分析(XPS)研究了等离子体处理前后复合材料表面性能的变化.试验结果表明,经等离子体处理后,复合材料表面的接触角减小,表面润湿性得以改善;FTIR分析结果表明,经等离子体处理后,复合材料表面有—OH、—C=O和—O—C=O基团生成;XPS分析表明,经等离子体处理后,复合材料表面含氧基团的含量增加,在较短的时间内表面氧元素含量增加会达到平衡,且生成大量的—O—C=O基团。     

SBSVP的环氧化改性及其增韧环氧树脂的研究

以吡啶基官能化的SBS(SBSVP)为基料,利用甲酸和过氧化氢对SBSVP进行环氧化改性,合成了环氧化SBSVP(ESBSVP),并对其增韧环氧树脂进行了研究。研究结果表明:随着ESBSVP的加入,环氧树脂/二乙烯三胺固化物的弯曲强度降低,抗冲击强度先升高而后降低,ESBSVP含量3%时抗冲击强度最大,与未改性环氧树脂相比提高了85%。SEM结果表明,经ESBSVP改性的环氧树脂体系断面呈现出明显的韧性断裂特征。DMA分析表明,加入ESBSVP后,环氧树脂体系在改善韧性的同时,玻璃化转变温度略有增加。     

The treatment of the spin coupling in the bonding of NO to the Ni-doped MgO (100) surface

The results are reported of density functional theory (DFT) and explicitly correlated wave-function (CASSCF and CASPT2) calculations on the bonding of NO with the Ni-doped MgO(100) surface. The surface is represented by means of a cluster of ions embedded in point charges. A comparison is made between unrestricted (spin polarized) and spin restricted approaches. While the geometry of the surface complex is described in quite an accurate way by a spin unrestricted DFT approach, e.g., using the B3LYP functional, the spin distribution does not correspond to that of the real physical situation. In fact, the spin polarized DFT treatment shows three unpaired electrons, two with spin up and one with spin down, while EPR experiments show clearly the existence of a single spin localized on an Ni 3d shell. A spin restricted B3LYP treatment, on the other hand, gives a correct spin distribution and geometry but fails in reproducing the adsorption energy. Other exchange-correlation functionals behave in a similar or even worse way. The CASPT2 results, by contrast, are in substantial agreement with the experiment, showing the importance of treating on the same footing the spin and electron correlation as well as the multi-configuration character of the wavefunction.     

Tailor and Control of Acidic Strength in Ordered Mesoporous Aluminosilicates by Using Preformed Zeolite Precursors

The acidic strength of ordered mesoporous aluminosilicates of MAS-2, MAS-3, MAS-7 and MAS-9 and microporous crystals of Y, L, beta, and ZSM-5 zeolites was systemically investigated by temperature-programmed desorption of ammonia (NH3-TPD). Due to the use of preformed zeolite precursors of Y, L, beta and ZSM-5, the ordered mesoporous aluminosilicates with distinguished acidic strength were obtained, being dependent on the type of preformed zeolite precursors. Therefore, the acidic strength of these mesoporous aluminosilicates could be tailored and controlled.