天然生漆/丙烯酸树脂IPN涂料的制备与性能

研究了直接由天然生漆(raw lacquer,RL)和多羟基丙烯酸树脂(multihydroxyl polyacrylate resin,MPAR)制备IPN(interpenetrating polymer network)涂料的方法,以及生漆的预聚合对涂料成膜的作用,并对共混物涂膜的物理机械性能、抗溶剂性能、抗紫外线性能等进行了测试表征。结果表明,天然生漆/丙烯酸树脂互穿网络共混能使RL与MPAR相互交联、缠结,其涂膜兼具有天然生漆和丙烯酸树脂的优良性能。     

高固体分羟基丙烯酸树脂的合成

采用溶液聚合法合成了高固体分低粘度的羟基丙烯酸树脂(HAR),详细讨论了引发剂、链转移剂、反应温度、溶剂等对HAR粘度的影响。由HAR和六次甲基二异氰酸酯反应制备了性能优异的高固体分双组分丙烯酸聚氨酯涂料。     

水性丙烯酸酯聚氨酯涂料的研究

合成了含羟基的丙烯酸酯树脂,并与甲苯二异氰酸酯反应制备预聚体Ⅰ,Ⅰ与扩链剂二羟甲基丙酸反应得到含羧基的预聚体Ⅱ,最后用1,4-丁二醇交联,制得水性丙烯酸酯聚氨酯涂料,讨论了合成过程中影响乳液稳定性和涂膜性能的因素。测试结果表明：涂膜的强度、光泽、硬度等性能均优于传统的同类树脂。     

涂料用可交联聚丙烯酸酯乳液的研究进展

对涂料用可交联丙烯酸乳液的制备方法,组成、结构与乳液及涂膜性能的相互关系和各种乳液体系的交联机理作了较详细的综述。     

涂料用可交联聚丙烯酸酯浮液的研究进展

对涂料用可交联丙烯酸乳液的制备方法,组成,结构与乳液及涂膜性能的相互关系和各种乳液体系的交联机理作了较详细的综述。     

水脱型UV防护油墨的制备及性能研究

通过将环氧树脂E44、丙烯酸、2-丙烯酰胺-2-甲基丙磺酸反应,合成了一种改性环氧丙烯酸树脂。将改性的环氧丙烯酸树脂作为主体树脂,复配活性单体、引发剂、助剂、填充料等进行混合、分散、研磨,制备得到热水脱膜UV防护油墨。将该树脂与其他丙烯酸树脂进行性能对比,并进一步探究不同活性单体、膜层厚度与光固化能量对防护油墨的性能影响。实验表明,该树脂具有较好的热水脱膜性能,当采用活性单体二乙二醇二甲基丙烯酸酯,膜层厚度为30?m及固化能量为1 500 mJ/cm2时,防护油墨综合性能最佳。     

氟硅协同改性丙烯酸树脂的合成与防污性能研究

以甲基丙烯酸十二氟庚酯(FMA)、甲基丙烯酸聚二甲基硅氧烷基酯(SMA)、甲基丙烯酸甲酯、丙烯酸正丁酯、甲基丙烯酸正丁酯和丙烯酸乙酯为共聚单体,通过溶液聚合反应合成出侧链含有机氟、有机硅的丙烯酸树脂.通过核磁共振氢谱(1H-NMR)、核磁共振氟谱(19F-NMR)、红外光谱(FTIR)对聚合物的结构进行了表征.通过扫描电镜(SEM)、接触角测试和生物评价等方法,探讨了FMA、SMA含量对树脂涂膜性能的影响.结果表明氟硅改性的丙烯酸树脂比单独含氟或含硅改性的丙烯酸树脂具有更低的表面能,而且氟硅改性的丙烯酸树脂涂膜比商业化的聚硅氧烷涂膜具有更好的防污性能.     

粘度法研究氯化聚丙烯和涂料树脂间的相容性

用稀溶液粘度法研究了氯化聚丙烯与石油树脂、丙烯酸树脂和醇酸树脂间的相容性,并用α判据对相容性结果进行判别。结果显示,石油树脂/氯化聚丙烯的共混体系是相容的;丙烯酸树脂/氯化聚丙烯的共混体系是不相容的。而醇酸树脂与氯化聚丙烯的相容性情况复杂,由二者的组成决定。当m(醇酸树脂)∶m(氯化聚丙烯)1∶1时,体系是相容的;当m(醇酸树脂)∶m(氯化聚丙烯)1∶1时,体系是不相容的。通过共溶剂法和涂膜宏观特性对上述体系的相容性进行测定,所得结果与α判据的结果相符合,印证了稀溶液粘度法研究溶液中高分子间的相互作用来预测涂料树脂的相容性具有一定可行性。     

超支化树脂改性UV固化粉末涂料

本文将超支化树脂(HBP)与UV固化粉末涂料相结合,研究了超支化树脂对该涂料的树脂体系玻璃化温度、流变性能及涂膜各项物理性能的影响.结果表明:添加改性与未改性超支化树脂都能降低树脂体系的玻璃化温度,改性超支化树脂不影响体系的流变性能及涂膜性能,未改性超支化树脂可以降低体系粘度但使涂膜性能变差.     

基于傅里叶变换红外光谱和气相色谱-质谱的未知涂料成分分析

采用傅里叶变换红外光谱法（FT－IR）和气相色谱－质谱法（GC－MS）定性分析了未知涂料的主要化学组成。将涂料恒温烘干成膜,剪裁成条状和碎片状,经乙腈、甲醇超声提取,四氢呋喃溶解后,分别取条状涂膜及其四氢呋喃不溶物进行FT－IR分析,结合吸收峰特征、谱库检索定性。结果表明,涂料成膜物质主要是丙烯酸酯。将涂料样品及其乙腈和甲醇提取液,分别进行GC－MS分析并结合保留指数、谱库及文献筛查定性。结果表明,涂料溶剂由2-乙基己醇、邻二甲苯、间二甲苯、苯乙酮等组成;可能的助剂成分主要包括1-甲基萘、棕榈酸甲酯、α-甲基苯乙烯、2,4-二叔丁基苯酚、2,4-二甲基-6-叔丁基苯酚、油酸酰胺等;甲基丙烯酸正丁酯、丙烯酸异辛酯是未知涂料中的聚合单体。     

Preparation and surface modification of PVDF-carbon felt composite bipolar plates for vanadium flow battery

The performance of vanadium flow batteries(VFBs) is closely related to the materials used in the bipolar plates. Carbon-based composite bipolar plates are particularly suitable for VFB applications. However,most original preparation methods cannot simultaneously achieve good electrical conductivity and mechanical performance. In this paper, we propose a novel approach to fabricating bipolar plates with carbon plastic materials, including four steps, namely coating a poly(vinylidene fluoride)(PVDF) solution onto carbon felt, solvent evaporation, hot-pressing, and surface modification. The resulting bipolar plates showed high conductivity, good mechanical strength, and corrosion resistance. Surface modification by coating with carbon nanotubes(CNTs) removed the PVDF-rich layer from the surface of the carbon fibers.The high surface area of the CNT withdrew PVDF resin from the carbon fiber surface, and promoted the formation of a conductive network. The flexibility and battery charge-discharge cycle measurements showed that the composite bipolar plates can meet requirements for VFB applications.     

Controlled crystallization of poly(vinylidene fluoride) chains from mixed solvents composed of its good solvent and nonsolvent

Poly(vinylidene fluoride) (PVDF) chains with the same expanded state were obtained by dissolving PVDF resin in good solvent. Then, the crystallization of PVDF chains from mixed solvents composed of its good solvent and nonsolvent was investigated. N,N‐dimethylformamide (DMF) and ethanol were used as good solvent and nonsolvent of PVDF, respectively. The crystalline phases of PVDF were characterized by Fourier transform infrared (FTIR) spectroscopy and wide angle X‐ray diffraction (WAXD). For the crystallization of PVDF chains from mixed solvents, low ethanol content favored the formation of β phase, while high ethanol content resulted predominantly in the α phase. Different crystallization morphology was observed from the scanning electron microscopy (SEM) images. The obvious spherulite morphology disappeared with the increase in ethanol content in mixed solvent. According to thermal analyses, the crystallized PVDF from mixed solvents with high ethanol content had lower onset melting temperatures than that from low ethanol content. Smaller lamellar thickness calculated from WAXD data reasoned the low onset melting temperatures. The above results indicated that the crystallization of PVDF chains from mixed solvent was a “controlled” process by ethanol content. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 575–581, 2010     

聚偏氟乙烯薄膜压电性的研究

本文研究了聚偏氟乙烯的压电性。聚偏氟乙烯薄膜是用DMA溶剂浇铸而成,然后进行单轴拉伸,并采用热驻极的方法使薄膜成极。实验结果表明,压电活性依赖于拉伸比、极化电场、极化温度和极化时间。此外,还研究了聚偏氟乙烯压电薄膜的稳定性和某些使用特性。     

Monitoring of Vapor-Induced Phase Separation during Spin Coating of PVDF by Optical Scattering

Solutions of poly(vinylidene fluoride) (PVDF) and dimethyl sulfoxide (DMSO) were spin cast under varying relative humidity environments. To elucidate film formation mechanisms, in situ optical scattering was used to monitor the physical processes occurring during spin coating. SEM micrographs and optical scattering taken together show that vapor-induced phase separation (VIPS) is a process that controls morphology during spin coating. Time periods were identified in the optical scattering patterns allowing for real time identification of phase separation for greater process control.     

热处理对聚偏氟乙烯-酰胺类溶剂所制薄膜结晶行为的影响

使用红外光谱和偏光显微镜对PVDF(聚偏氟乙烯)-DMF(N,N-二甲基甲酰胺)和PVDF-DMAc(N,N-二甲基乙酰胺)体系结晶行为的研究表明,PVDF薄膜的结晶受制备溶剂,后期热处理温度和膜厚度等因素的影响;升高温度,β相含量减小;当温度低于90℃时,PVDF-DMF体系的F(β)值较DMAc体系大,在90~160℃之间则相反,且两种体系的F(β)值分别在约90℃和80℃发生“突变”;同时,结晶还明显受到薄膜厚度的影响,厚度大,结晶较完善.     

PVDF亲水复合膜的制备及表征

聚偏氟乙烯(PVDF)膜材料存在强疏水性的缺陷,亲水化改性是解决该问题的主要途径。以PVDF为基膜材料、聚乙烯醇(PVA)为共混材料、N,N-二甲基乙酰胺(DMAc)为溶剂,采用相转化法制备PVDF/PVA复合膜。考察了复合膜的PVDF/PVA共混比、固含量、低分子化合物添加剂、聚合物添加剂等非溶剂添加剂对复合膜接触角的影响。结果表明,当PVDF/PVA共混比为7/3,固含量为13%时,制备的复合膜接触角为22.92°;当添加剂为无水氯化锂、纳米二氧化硅、聚乙烯吡咯烷酮(PVP)时,复合膜接触角分别从53.12°、30.51°和41.89°都降低到了0°,亲水性提高,其中纳米二氧化硅作为添加剂时复合膜亲水性最好;当添加剂为丙三醇、PMMA、PEG时,复合膜接触角都增大,亲水性变差。     

Improved controlled relative humidity dynamic mechanical analysis of artists’ acrylic emulsion paints

After improvements were made to a modified Polymer Labs MkIII DMTA instrument to facilitate repeatable controlled humidity (RH) experiments using isothermal and thermal scanning conditions, the viscoelastic properties of titanium white pigmented artists’ acrylic emulsion films were measured in tensile mode. The effects of temperature, relative humidity and accelerated ageing regimes on two brands of titanium white paints were explored. These paints are highly responsive to changes in temperature and relative humidity, formulation differences affect properties slightly, and while light ageing had a negligible effect, thermal ageing resulted in decreased storage modulus and increased film density.     

甲基丙烯酸二甲胺乙酯对光固化阴极电泳漆性能的影响

通过自由基共聚合得到丙烯酸树脂,然后用甲基丙烯酸异氰酸乙酯(MOI)对其改性,合成了既带有N,N-二甲胺基,又带有乙烯基的紫外光固化阴极电泳漆基体树脂。研究了甲基丙烯酸二甲胺乙酯(DMAE-MA)用量对改性丙烯酸树脂水分散体和漆膜性能的影响规律。结果表明,树脂分子链上引入DMAEMA后,其水分散性有较大改善,随DMAEMA用量增加,水分散体的粒径减小、粘度略有增加、稳定性增强,电泳沉积量和漆膜厚度增加,电泳沉积漆膜的初期含水率增加。综合考虑水分散体和漆膜的性能,丙烯酸树脂中DMAEMA质量分数以0．144左右为宜。     

Incorporation of Reactive Corrosion Inhibitor in Waterborne Acrylic Polyurethane Coatings and Evaluation of its Corrosion Performance

Hydroxyl-epoxy phosphate (HEP) as a reactive corrosion inhibitor was innovatively synthesized by the reaction of bisphenol A epoxy resin with phosphoric acid. HEP was mixed with hydroxyl acrylate resin, and crosslinked with waterborne isocyanate curing agent, which was used to form waterborne HEP/acrylic polyurethane composite (HEP-APU) coatings on Q235 steel surfaces. Electrochemical impedance spectroscopy and polarization curves were applied to analyze the corrosion behavior of the HEP-APU coatings in 3.5wt% NaCl solutions. The results indicated that the HEP-APU coatings show a superior passivation property and efficient corrosion protection of Q235 steel. The waterborne acrylic polyurethane coating containing 0.5wt% HEP exhibited the best corrosion performance among all the coating specimens. The improved flash-rust resistance can be attributed to the introduction of the phosphate group which could form phosphate film on the steel substrate.