以Al和Zr的金属盐为前驱物、正硅酸乙酯为硅源,通过直接水热法制备了不同n(Si)/n(M)(M=Al、Zr或Al-Zr)的催化剂M-SBA-15.通过X射线衍射、N2吸附-脱附、吡啶红外光谱等手段对制备样品进行了表征,并将其用于催化苯酚、甲醛的羟烷基化反应中合成双酚F.结果表明:Al和Zr原子成功掺杂到SBA-15的骨架中,并且在M-SBA-15上同时存在Brønsted酸和Lewis酸位点;当n(Si)/n(M)为20时,催化效果最好,双酚F的收率达到82.4%,此外,可以通过调控原料中的n(Al)/n(Zr),调节4,4'-,2,4'-,2,2'-双酚F含量;最后,提出了M-SBA-15催化合成双酚F的可能反应机理.

以水性羟丙树脂和改性水玻璃为成膜基料,搭配多种颜填料与助剂制备了一款性能优异的水性金属防腐涂料,重点探讨了成膜物质、防锈填料、颜料体积浓度(P V C)和涂膜厚度对涂层性能的影响.研究结果表明:当水玻璃与羟丙树脂的质量比为1︰4,云母氧化铁与复合防锈颜料E的质量比为1︰1且占填料总用量的50％～60％,颜料体积浓度(P V C)达到30％～35％,涂层厚度约为150μm时,所制复合水性金属防腐涂料具备最佳综合性能.

作为现代职业教育体系中的重要办学模式,现代学徒制是深化产教融合和促进校企合作的有效途径,得到了全国各级教育部门和职业院校的高度重视.学院精准聚焦湖南省涂料产业对技能人才的迫切需求,以精细化工专业先行试点,探索现代学徒制,通过深入剖析在具体实践过程中存在的企业热情不高、学生兴趣不浓、管理制度缺失、师资力量薄弱、课程体系落后等系列问题,找准问题的症结和成因,进而有针对性地提出了有效的对策和改进措施,以期为其他高职院校实施现代学徒制提供有价值的参考和借鉴.

将硅烷偶联剂KH560 作为改性介质,采用化学接枝法在KH560 与玻璃鳞片(GF)的质量比分别为1∶1、3∶1 和5∶1的条件下合成了KH560/GF、3KH560/GF和 5KH560/GF三种表面改性玻璃鳞片.红外光谱和扫描电镜的测试结果表明KH560 发生水解缩合并与玻璃鳞片表面的活性羟基共价键合,硅烷低聚物沉积到玻璃鳞片表面形成包覆层.再以改性玻璃鳞片为防腐填料,搭配环氧乳液、颜填料和各类助剂研制了一款性能优异的双组分水性环氧防腐涂料,探讨了水性环氧树脂种类、树脂与固化剂的质量比、改性玻璃鳞片种类及其用量对漆膜性能的影响.实验结果表明:当选用环氧乳液2060和固化剂725且其质量比为5∶1,3KH560/GF在防锈体系中的质量分数为60％时,所制涂层综合性能最佳,耐中性盐雾时间可达720 h.

作为我国现代职业教育体系建设的研究热点,现代学徒制是职业院校精准对接区域产业发展需求,通过校企双元主体育人,高效推进人才培养供给侧改革的重要举措.我校以精细化工专业先行试点,主动对接湖南省涂料产业.总结分析本专业现代学徒制实践中存在的关键问题,探索实施"一体两翼,三环四岗,五共六融"现代学徒制人才培养模式,挖掘出一条培育高素质涂料行业技能人才的新路径,能为其他高职院校开展现代学徒制提供可以借鉴的实践思路和经验做法.

制定科学化、标准化的专业教学标准,是高等职业教育人才培养质量的保证.文章分析了校企供需现状,梳理了高分子材料智能制造技术专业的职业岗位能力,构建行、校、企多方联动的对接职业能力标准和课证融通及湖湘特色融合的"三层两贯穿"模块化课程体系,推进职业能力培养层层递进.以国家职业教育标准为蓝本,深入落实产教融合,深度对接服务区域经济发展,建设基于职业能力的湖湘特色高分子材料智能制造技术专业教学标准,为专业教学的实施提供科学依据.

以湿法制得的斜方晶型三氧化二锑(Sb2O3)为原料,采用真空加热法制备了立方晶型的三氧化二锑.采用X射线衍射分析(XRD)和扫描电镜(SEM)对产物进行了表征,研究了体系压强、加热温度、加热时间对三氧化二锑晶型与粒度的影响.结果表明:当加热温度升高时,三氧化二锑由斜方晶型逐渐转变为立方晶型;但当加热温度升高至450℃时,已经全部转变为立方晶型的三氧化二锑中,部分立方晶型又开始转变为斜方晶型;随着加热温度的升高,样品团聚程度增加,样品的平均粒度逐渐增大.随着体系压强的下降和加热时间的延长,三氧化二锑由斜方晶型逐渐转变成立方晶型.但体系压强的下降,会增大样品团聚程度以及样品的平均粒度;加热时间延长,样品的平均粒度也逐渐增大.

通过分子设计将二氨基马来腈配合物、双噻吩咔唑引入到聚合物分子主链上,构成一种新型的含过渡金属配合物的新型聚合物,通过核磁共振氢谱、傅里叶变换红外光谱、热重分析、紫外吸收和荧光发射光谱、循环伏安测试研究了新型聚合金属配合物的化学结构、光学性能.结果表明,以二氨基马来腈配合物为受体材料,双噻吩咔唑为给体材料的新型聚合金属配合物所制备的光伏器件得到光电转换效率(PCE)分别为2.14％、1.65％,同时表现出良好的耐热性能.

以1,10-菲洛林为起始原料,通过溴亲电取代反应、席夫碱反应、配位化学反应制得电子受体-配合物L1、L2;辛基咔唑与噻吩通过Witting反应得到含长烷基链的共轭给电子大单体;通过Yamamoto coupling反应制得具有推-拉分子结构的聚合金属配合物P1(Zn)、P2(Co),其结构经GPC、FT-IR、1H-NMR等表征.将目标聚合金属配合物作为染料应用于染料敏化太阳能电池(DSSCs),并研究了光伏性能.结果显示:在模拟太阳光光源(光强为100 mW/cm2)下,P1(Zn)、P2(Co)的光电转换效率(PCE)分别为1.97％和1.84％,同时测得P1(Zn)、P2(Co)的热分解温度(Td)均超过300℃,热稳定性高.因此,这类含过渡金属(Zn、Co)的聚合物金属配合物作为新型染料应用于DSSCs具有巨大的潜力.

Herein, this paper perhaps reports for the first time that a series of glass fiber reinforced poly(butylene succinate) composites (GRPBS) using the flame-retardant system composed of aluminum hypophosphite (AHP) and melamine cyanurate (MC) are fabricated by melt blending method. When the composite is loaded of 20 wt% AHP/MC with mass ratio about 2:1, it achieves UL-94 V-0 rating with the value of limited oxygen index (LOI) significantly increasing to 30%. Meanwhile, the thermo-gravimetric analysis also well proves that the composite can produce more char residues because of the addition of AHP, however, its thermal stability would slightly decreases. In addition, the results obtained from micro-scale combustion calorimetry testing reveal that total heat release and peak of heat release rate for GRPBS composites combined with AHP and MC both significantly reduce, and the similar results are easily found in cone calorimeter testing. Additionally, the residues after LOI testing are further investigated by Fourier transform infrared spectrometry and scanning electron microscopy, which definitely confirm the formation of the compact char layer with crater-like structure. Mechanism analysis indicates the significant enhancement of flame-retardant efficiency principally benefits from the cooperative work dominated by AHP and MC.

化工类专业实践教学环节是责任关怀的起点,在校期间系统培养学生的安全知识与技能,增强责任关怀意识,具有重要意义.文章阐述了化工类专业实践教学现状,探索了将责任关怀理念融入实践教学体系的构建策略,并从实践教学项目重构、责任关怀课程开设、教师责任关怀施教能力提升、强化实训基地建设与管理等方面探讨了融责任关怀理念的实践教学改革举措.

采用碱性水解法从皮革废屑中提取胶原蛋白(HC),以丙烯酰胺(AM)、2-甲基丙烯酰氧乙基三甲基氯化铵(DMC)为改性单体,设计合成了HC-g-PAM、HC-g-PDMC和HC-g-P(DMC+AM)三种胶原基絮凝剂.利用核磁共振仪、扫描电镜以及电位分析仪对接枝产物的结构与性能进行表征,以甲基橙(MO)溶液模拟印染废水作为目标污染物,探究合成参数与絮凝条件对脱色性能的影响.结果表明:胶原基絮凝剂具有疏松、粗糙和多孔化的蜂窝状表面结构,正电荷密度显著增强;絮凝剂最佳投放量为40～60 mg/L,降低pH、减小NaCl浓度及控制废水温度在20℃左右有利于提高絮凝效果,HC-g-P(DMC+AM)的絮凝能力最强,其对MO溶液的脱色率最高可达91.3％.

银离子由于其双重特殊性而成为超分子识别领域的重要研究对象.传统的银离子检测方法耗时长、费用高.因此,开发具有高度识别选择和灵敏性的银离子荧光探针分子是至关重要的.本文从分子结构的角度,综述了基于荧光素、罗丹明、四苯乙烯、六氮杂苯并菲等共轭性基团而设计的银离子荧光探针,为银离子荧光探针的设计提供了结构的参考.

为了开发新的银离子(Ag+)荧光探针,实现高选择、高灵敏、可重复的银离子检测,通过在六氮杂苯并菲分子骨架外围对称性地引入六个呋喃基团,成功合成了一种结构新颖的化合物1,利用紫外-可见吸收光谱和荧光光谱分析、核磁滴定和Job's实验等证实了化合物1能够在氯仿溶液中选择性地与银离子形成络合物(量比n(Ag+):n(化合物1)为3:2)并产生荧光淬灭现象,进而实现对银离子的高灵敏性识别(检测限可达3.35×10-6 mol·L-1),结果表明,六氮杂苯并菲呋喃衍生物分子的构筑将有利于新型银离子传感器的开发,并在环境检测等领域具有潜在应用价值.

以丙烯酸(AA)为小单体,甲基烯丙基聚氧乙烯醚(TPEG)为大单体,过硫酸铵(APS)为引发剂,在氮气气氛下发生自由基聚合反应,生成梳状线性TPEG-AA共聚物,共聚物以乙二醇(EG)为交联剂,硫酸为引发剂,对合成的TPEG-AA进行热交联,通过严格对聚羧酸合成条件进行控制,对交联荆浓度进行了研究,发现在140℃的下,EG用量为共聚物单体质量的11％时获得最优的共聚交联聚羧酸减水剂,通过实验得出,交联共聚型聚羧酸减水剂的最佳制备工艺参数为:TPEG∶AA∶EG=1∶3.2∶0.11.通过红外光谱仪对合成的交联共聚醚类聚羧酸减水剂进行定性分析,该减水剂具有良好的减水荆分散性能.

以过碘酸钠为氧化聚合诱导剂,在微酸性条件下(pH=5.0)合成了聚多巴胺修饰的分子筛载体.采用环己烷-水双溶剂法,制备了聚多巴胺修饰的SBA-15负载钌催化剂,并对催化剂进行了表征.实验结果表明,聚多巴胺能显著提高催化剂的亲水性,修饰后的催化剂在苯部分加氢反应中表现出高环己烯选择性;采用该催化剂,苯转化率为63.2％时,环己烯收率可达51.8％;聚多巴胺的引入不会影响SBA-15长程有序的介孔结构,催化剂具有适中的比表面积和良好的钌分散度.

Polydopamine-modified MCM-41 was prepared by sodium periodate-induced polymerization. Ru-La supported on MCM-41 and polydopamine-modified MCM-41 catalysts were prepared by double solvent impregnation method and tested for benzene hydrogenation to cyclohexene. Polydopamine-modified MCM-41 supported Ru-La catalyst exhibits much higher hydrophilicity and more moderate catalytic activity than unmodified MCM-41 supported Ru-La catalyst. The higher hydrophilicity, more moderate catalytic activity, and long-range order of mesoporous structure are beneficial for improving cyclohexene selectivity on account of the promotion of the desorption and the inhibition of the adsorption of cyclohexene. 47.0% of cyclohexene yield was obtained over Ru-La supported on polydopamine-modified MCM-41 in benzene hydrogenation.

Hydrophilic polyethylene glycol (PEG) modified MCM-41 and supported ruthenium catalyst were prepared, characterized and tested for benzene hydrogenation to cyclohexene. Ruthenium supported on PEG modified MCM-41 exhibits much better catalytic property than the unmodified catalyst. A cyclohexene yield of 55.4% was obtained at 68.5% of benzene conversion over ruthenium supported on MCM-41 modified with 5 wt% of PEG (by weight of MCM-41). It has been found that the introduction of PEG could effectively improve the hydrophilicity of MCM-41. The superior cyclohexene selectivity is mainly attributed to the hydrophilic modification of PEG to MCM-41, as well as the moderate catalytic activity, long-range order of mesoporous structure and good ruthenium dispersity of the catalyst.

A series of novel cationic flocculants are designed and synthesized successfully by grafting two monomers onto the collagen backbone, namely acrylamide (AM) and 2-methacryloyloxyethyltrimethyl ammonium chloride (DMC). Apparently, these effective grafting modifications are well demonstrated by adopting FTIR and H-1 NMR measurements, which could be used to estimate grafting ratios of corresponding monomers approximately. Additionally, significant improvements in positive charge densities and amorphous aggregation structures are also definitely confirmed by Zeta and XRD measurements, respectively. Moreover, thermogravimetric analysis clearly proves the formation of cationic branched chain architectures, whose maximum thermal degradation temperature would significantly decrease with the introduction of AM. In addition, much more porous and rougher surface structures could be visibly observed after successful grafting modifications. Furthermore, when the feeding weight ratio between collagen and DMC is controlled at 1:3, or the equal amounts of AM and DMC are introduced meanwhile the mass ratio between collagen and mixed monomers (DMC+AM) is fixed at 1:4, the samples acquired could both perform the best in decolorizing the model wastewater containing methyl orange (MO) dyes in their groups, and hereby, a corresponding flocculation mechanism is also proposed based on the structural analysis of the formed flocs. (C) 2017 Wiley Periodicals, Inc.

以端硅烷聚醚聚合物、填料、脱水剂和催化剂等为原料,制备出了单组分湿固化密封胶,探讨了催化体系对胶性能的影响.试验结果表明,相比传统的二月桂酸二丁基锡(DBTL),高活性有机锡催化剂(TEG0KAT 226)具有更好的催化效果.其与硅烷低聚物(Dynasylan 1146)组成的催化体系能有效地加快胶的表干和固化过程,制备的密封胶具有较好的力学性能和粘接强度.当TEG0KAT 226添加量为1.2份,Dynasylan 1146添加量为2份时,密封胶表干时间为28 min,固化后胶的拉伸强度为1.65 MPa,拉伸剪切强度为1.55 MPa,具有良好的贮存稳定性.