环状氯化磷腈阻燃微胶囊制备研究

通过UV界面聚合法,制备了以环状氯化磷腈为囊芯,丙烯酸酯共聚物为囊壁的阻燃微胶囊。对产物微胶囊的性质进行了系统表征,具体包括粒径及其分布、化学结构、表面形态和热稳定。结果表明:包囊提高了环状氯化磷腈的热稳定性、阻燃性,且对环氧复合材料的力学性能影响甚微。     

原位聚合法制备聚磷酸铵微胶囊及其应用的研究进展

以聚磷酸铵微胶囊阻燃剂的包覆壳材料为重点,综述了聚磷酸铵微胶囊阻燃剂的无机材料包覆、有机材料包覆、双层或多层包覆以及纳米材料包覆,总结了国内外关于原位聚合法制备聚磷酸铵微胶囊的最新研究进展。介绍了聚磷酸铵微胶囊形成过程中,包覆壳材料与聚磷酸铵的原位聚合方法及机理。并且提出了聚磷酸铵阻燃剂在材料燃烧过程中存在的协同效应。最后,结合聚磷酸铵微胶囊阻燃剂在阻燃过程中存在的问题,展望了原位聚合在微胶囊阻燃领域中的未来发展方向。     

界面聚合法制备正二十烷微胶囊化相变储热材料

采用界面聚合的方法, 以甲苯鄄2,4-二异氰酸酯(TDI)和乙二胺(EDA)为反应单体, 非离子表面活性剂聚乙二醇壬基苯基醚(OP)为乳化剂, 合成了正二十烷为相变材料的聚脲包覆微胶囊. 结果表明, 二异氰酸酯和乙二胺按质量比1.9:1 进行反应. 以透射电镜和激光粒度分析仪分析微胶囊, 测得空心微胶囊直径约为0.2 μm, 含正二十烷微胶囊约为2-6 μm. 红外光谱分析证明, 壁材料聚脲是由TDI 及EDA 两种单体形成的. 正二十烷的包裹效率约为75%. 微胶囊的熔点接近囊芯二十烷的熔点, 而其储热量在壁材固定时随囊芯的量而变. 热重分析表明, 囊芯正二十烷、含正二十烷的微胶囊以及壁材料聚脲, 能够耐受的温度分别约为130 ℃、170 ℃及270 ℃.     

界面聚合及其应用进展

综述了界面聚合的发展过程及其在膜、微胶囊、纳米材料、聚酯等制备方面的应用进展.     

原位聚合法制备鱼藤酮微胶囊

原位聚合法制备;鱼藤酮微胶囊;鱼藤酮;原位聚合法;微胶囊;三聚氰胺甲醛树脂     

含磷萘基环氧的制备及其固化物的热分析

含磷萘基环氧的制备及其固化物的热分析;环氧;磷;改性;热性质;阻燃     

界面聚合法制备复合膜

本文对近年来国内外利用界面聚合法制备超薄复合膜的研究进行了综述。阐述了界面聚合成膜反应的原理,并从反应单体种类的角度进行分类,对目前由界面聚合法制备复合膜的研究现状进行了较详细的介绍和分析;对界面聚合法制备复合膜存在的问题以及研究前景进行了展望。     

界面聚合法制备复合膜中的改性研究

介绍了复合膜的结构及性能,阐述了界面聚合法的基本原理及用该法制备复合膜的优越性;同时重点综述了国内外对复合膜的性能如通量和截留率、耐氯性、热稳定性、耐溶剂性和抗污染性的研究现状及改进方法,并对界面聚合法制备复合膜存在的问题以及研究前景进行了展望。     

界面聚合法合成聚邻苯二胺及其表征

邻苯二胺电聚合膜己广泛用于生物活性物质固定、电催化、腐蚀防护和电色材料研究,近期也用于制备分子印迹型化学/生物传感器[1,2]。人们已经研究了聚邻苯二胺的结构特性、性能及应用前景[3,4,5]。目前聚合物基纳米复合材料的制备方法主要有:分子自组装法、微乳液聚合法、电化学     

蓄热调温石蜡相变微胶囊的制备及性能

采用界面聚合法,以甲苯2,4-二异氰酸酯和哌嗪为反应单体、30号相变石蜡为芯材,制得了一种智能纺织品用蓄热调温相变微胶囊。通过红外光谱、扫描电镜、差示扫描量热仪对微胶囊的化学组成、形貌和蓄热性能进行了表征,测试了其耐热和耐溶剂性。结果表明:所得微胶囊主要为球形,表面光滑,平均粒径为10.6μm,对w=0.40的NaOH溶液、w=0.60的H2SO4溶液、无水乙醇、丙酮稳定,能被甲苯、二甲基甲酰胺、乙醚破坏。相变潜热为118 J/g,石蜡在微胶囊中的质量分数为84%。     

Acrylamide Hydrogels Preparation via Free Radical Crosslinking Copolymerization: Kinetic Study and Morphological Investigation

The simultaneous gravimetric and dilatometric techniques have been used to study the kinetics of aqueous free radical crosslinking copolymerization of acrylamide (AAm) and N,N^'-methylenebisacrylamide (MBA) at different crosslinker ratios, and reaction temperatures. In this study, the gel properties were investigated using swelling measurements and microscopic techniques. Based on the data, it was proposed that the deviation point of the results of dilatometric technique from those of the gravimetric one can be a new criterion for gel point. The monomer conversion and the equilibrium swelling ratio of the hydrogels were measured as a function of the reaction time. Experimental data showed an inverse dependence of the critical gel point on crosslinker concentration. As the MBA/AAm ratio was decreased to 0.1?wt%, the product appearance changed. In addition, the effects of temperature on the reaction rate and critical gel point were studied. At higher temperatures, the equilibrium swelling ratio reached to its minimum value earlier. Besides, the hydrogel surface became smoother.     

近红外原位研究杂多酸引发的环氧-四氢呋喃阳离子聚合

用近红外光谱原位跟踪的方法, 研究了杂多酸催化的环氧树脂和四氢呋喃的阳离子聚合过程. 发现在低环氧树脂含量下, 环氧消耗速率在整个聚合过程中维持不变; 而在高环氧树脂含量下, 环氧消耗速率则随时间有所下降. 通过红外光谱在碳氢区域的分峰分析, 证明环氧树脂与四氢呋喃发生了共聚反应, 二维红外光谱的结果也确证了这一结果. 此外, 还探讨了环氧转化速率与环氧含量间的关系.     

近红外原位研究杂多酸引发的环氧-四氢呋南阳离子聚合

用近红外光谱原位跟踪的方法,研究了杂多酸催化的环氧树脂和四氢呋喃的阳离子聚合过程.发现在低环氧树脂含量下,环氧消耗速率在整个聚合过程中维持不变;而在高环氧树脂含量下,环氧消耗速率则随时间有所下降.通过红外光谱在碳氢区域的分峰分析,证明环氧树脂与四氢呋喃发生了共聚反应,二维红外光谱的结果也确证了这一结果.此外,还探讨了环氧转化速率与环氧含量间的关系.     

Preparation and Performance of Dual-functional Magnetic Phase-change Microcapsules

The fabrication of desired anti-magnetic materials for irradiation shielding remains a challenge to date. In this work, a new type of dual-functional magnetic shielding phase change microcapsules with paraffin as the core, melamine-formaldehyde (MF) resin as the shell and doped with magnetic particles in the shell were successfully prepared by in situ polymerization. The magnetic particles were dispersed in the shell layer by coating a hydrophilic emulsifier on the surface. These microcapsules were specifically applied to the field of magnetic shielding by the screen printing method. The effect of magnetic particles on the performance of phase-change microcapsules was examined by differential scanning calorimetry and thermogravimetric analyses. The magnetic type and magnetic strength of the microcapsules were studied by the vibrating sample magnetometer. Moreover, the effects of different magnetic particles (Fe₃O₄, CrO₂) on the performance of phase change microcapsules and the magnetic strength of microcapsules were compared. The results showed that these two kinds of magnetic particles can greatly improve the phase change latent heat, thermal stability, and thermal conductivity of the microcapsules. Finally, the great magnetic shielding role of these microcapsules was demonstrated in both static and pulsed magnetic fields through the screen printing of magnetic shielding ink on wallpaper. Incorporating 0.5 g Fe₃O₄ inside of microcapsules, specifically, the magnetic intensity was effectively reduced by ∼250 Oe within a short distance in the static field. We expect that these magnetic microcapsules hold great potential for the shielding of irradiations via the screen printing on various substrates.     

KMnO4引发魔芋粉-丙烯腈的接枝共聚反应

以KMnO4为引发剂进行魔芋粉与丙烯腈的接枝共聚反应。研究了魔芋粉预氧化时间、引发剂浓度、单体浓度、酸度、反应时间、反应温度和反应物加料方式等聚合条件对接枝效率的影响，并对接枝机理作了探讨。     

Synthesis of Epoxy Methacrylate Resin and Coatings Preparation by Cationic and Radical Photocrosslinking

This work involves the synthesis of hybrid oligomers based on the epoxy methacrylate resin. The EA resin was obtained by the modification of industrial-grade bisphenol A-based epoxy resin and methacrylic acid has been synthesized in order to develop multifunctional resins comprising both epoxide group and reactive, terminal unsaturation. Owing to the presence of both epoxy and double carbon–carbon pendant groups, the reaction product exhibits photocrosslinking via two distinct mechanisms: (i) cationic ring-opening polymerization and (ii) free radical polymerization. Monitoring of EA synthesis reactions over time using PAVs, MAAC and NV parameters, and the FT-IR method reveals that esterification reactions proceed faster at the start, exhibiting over 40% of conversion within the initial 60 min, which can be associated with a relatively high concentration of reactive sites and low viscosity of the reaction mixture at the initial reaction stage. With the further increase in the reaction time, the reaction rate tends to decrease. The control of the EA synthesis process can guide how to adjust reactions to obtain EAs with desired characteristics. Based on obtained values, one can state that the optimum synthesis time of about 4–5 h should be adopted to prepare EAs having both epoxy groups and unsaturated double bonds. The structure of the obtained EA was confirmed by FT-IR and NMR methods, as well as the determination of partial acid value and epoxy equivalent. Samples at various stages of synthesis were cured with UV radiation in order to study the kinetics of the process according to cationic and radical polymerization determined via photo-differential scanning calorimetry (photo-DSC) and real-time infrared spectroscopy (RT-IR) and then the properties of the cured coatings were tested. It turned out that the cationic polymerization was slower with a lower conversion of the photoreactive groups, as compared to the radical polymerization. All the obtained EA coatings were characterized by good properties of cured coatings and can be successfully used in the coating-forming sector.     

焦磷酸络锰三价离子引发淀粉-丙烯酰胺的接枝共聚合

将带有极性基团的乙烯类单体通过化学接枝到淀粉或纤维素之类的天然多糖上,可作为絮凝剂、脱除剂和粘接剂^[1～3],近来已发展为高吸水性材料和石油分离剂^[4]。用Ce⁴⁺引发乙烯类单体接枝到淀粉和纤维素类已有报道^[5]。Rayonier用Mn³⁺的焦磷酸盐络合物引发接枝乙烯类单体至纤维素及其衍生物上^[6];Cenita等用Mn³⁺引发MMA、AN接枝淀粉^[7]。本文以焦磷酸络锰离子(Mn³⁺)作引发剂、丙烯酰胺(AM)为单体、淀粉为接枝基体进行接枝共聚,这一工作目前在国内外尚未见报道。     

紫外光固化脂环族环氧丙烯酸酯涂料的制备及性能

通过丙烯酸（AA）与脂环族环氧树脂的开环反应合成了可紫外光（UV）固化的脂环族环氧丙烯酸酯树脂（CEA）。采用红外光谱（FT-IR）对树脂结构进行了表征,研究了反应温度、反应时间对产率的影响。用活性稀释剂与CEA制备了涂料预聚物,用转板黏度计测定了预聚物的黏度,采用差示扫描量热（DSC）仪、综合热分析仪和铅笔硬度计对树脂固化膜进行了分析。结果表明：当丙烯酸与环氧基团摩尔比为1.03,120°C下反应25.8 h时,反应转化率可达96.58%。CEA固化膜的玻璃化转变温度为64°C,初始分解温度为314°C,活性稀释剂的加入增强了固化膜的耐热性,固化膜铅笔硬度可达6H。     

紫外光还原法制备铂填充硅钛复合纳米管及其光催化性能

以SiO2包覆的TiO2纳米管(TiNT@@SiO2)为载体,以H2PtCl6为前驱体,采用紫外光还原法制备了Pt纳米粒子填充的TiNT@@SiO2材料(Pt-TiNT@@SiO2).并采用透射电镜、场发射扫描电镜、电子能谱和X射线衍射等手段对材料样品进行了表征,考察了制备时紫外光照时间和强度以及Pt填充量对其形貌的影...