基于Pickering乳液法的微胶囊相变材料研究进展

文章介绍了微胶囊相变材料(MCPCM)的特点,重点综述了微胶囊相变材料的传统制备方法,介绍了新型Pickering乳液法的特点以及其制备微胶囊相变材料的发展前景,结合微胶囊应用领域,总结了微胶囊相变材料的现状及展望。     

Pickering乳液聚合技术在制备中空复合体中的应用

介绍了近年来应用Picketing乳液聚合技术制备中空复合体的研究,并对包括稳定剂表面性质、用量以及水油比等对此类乳液稳定性及复合体形貌的影响因素进行了讨论.     

纳米甲壳素基Pickering乳液辅助构筑相变微胶囊

相变微胶囊可以通过增加传热面积和防止泄漏来提高相变材料的热性能和机械性能。本文首先通过一种简单、高效的方法制备了纳米甲壳素,然后利用纳米甲壳素稳定石蜡制备Pickering乳液,最后通过乳液模板法得到相变微胶囊。文章着重研究了盐酸汽蒸甲壳素的时间,纳米甲壳素悬浮液的质量分数,核壳比等变量对微胶囊表面形貌和粒径的影响,实验结果表明,当汽蒸时间为5 h,纳米甲壳素悬浮液质量分数为0.5%,核壳比为3∶1时,所制得的相变微胶囊粒径为29.6μm,其熔融焓高达187.4 J/g,包覆率为71.6%。通过热重分析和加热/冷却循环测试对相变微胶囊的热稳定性和热循环性能进行表征,结果表明微胶囊具有良好的热循环稳定性。     

双重Pickering乳液法制备聚丙烯酰胺多孔微球及应用

采用亲水性气相二氧化硅N20和疏水性气相二氧化硅H30复配表面活性剂制备O/W/O型双重乳液,以此为模板,聚合中间相,挥发内相制备聚丙烯酰胺(PAM)多孔微球,并用于染料分子亚甲基蓝的吸附。结果表明：乳液显微镜照片显示水油比对双重乳液的形成有很大的影响,当水油比(O₁/W)/O₂为(1/2)/2时,可得到稳定的双重乳液;扫描电镜(SEM)照片显示PAM多孔微球基本呈球形,但粒径不均匀,球体表面粗糙,内部为空心结构;激光粒度仪(DLS)结果表明PAM微球平均粒径为356nm,多分散系数(PDI)为0.718,比表面积为230m²/g,粒径分布宽;在吸附温度35℃、吸附时间5min时对亚甲基蓝的吸附率为98.89%,最大吸附率超过99%,在吸附速率和吸附率上均优于传统PAM吸附剂,本研究为染料废水的处理提供了新方法。     

核壳结构丙烯酸酯微胶囊乳液的制备研究

以甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（BA）、甲基丙烯酸（MAA）为单体,以十二烷基硫酸钠（SDS）和脂肪醇聚氧乙烯醚硫酸钠为复配乳化剂,以过硫酸钾-亚硫酸氢钠为氧化还原引发剂,合成了核壳结构的丙烯酸酯微胶囊乳液。探讨了乳化剂的复配、氧化还原引发剂的比例和用量对微胶囊乳液粒度的影响。结果表明：上述条件下,能够制得平均粒径〈8μm的香味涂料用核壳结构的微胶囊乳液。     

凹凸棒石在Pickering乳液制备中的应用研究进展

凹凸棒石因具有独特的一维纳米棒状形貌、纳米孔道结构、天然的负电性和良好的水分散性等特点,在Pickering乳液的制备和应用方面受到广泛关注。在介绍凹凸棒石结构特点和理化性质的基础上,综述了凹凸棒石在Pickering乳液制备中的应用研究进展,以期为凹凸棒石及其它黏土矿物稳定Pickering乳液的机理研究及应用拓展提供较全面信息。     

双壳层石蜡微胶囊的制备及性能研究

以石蜡为芯材,廉价的聚脲和三聚氰胺甲醛树脂为壁材,采用原位聚合法和界面聚合法成功地制备了双壳层石蜡微胶囊.用差示扫描量热仪 (DSC) 和TG-DTA分析仪对石蜡微胶囊的性能进行了分析和表征,并讨论了乳化速度和搅拌速度对微胶囊性能的影响.实验结果表明,在乳化速度为9000 r·min-1,搅拌速度为300 r·min-1下,所制备的微胶囊包裹完全、表面光洁、平均粒径为4 μm,相变潜热高达180.5 J·g-1,耐热温度达200℃.考察了双壳层的聚合机理,分析结果表明最佳的乙二胺(EDA)与甲苯二异氰酸酯 (TDI) 摩尔比为1:1.1～1:1.3,三聚氰胺与甲醛摩尔比为1:1.5～1:1.8.     

蛋白质基微粒在Pickering乳液制备中的应用研究

概述了蛋白质基微粒稳定的Pickering乳液制备方法及应用。通过总结植物源和动物源蛋白质以及复合微粒稳定Pickering乳液的制备方法及应用,为蛋白质基微粒稳定的Pickering乳液在更多领域应用提供参考。最后,对蛋白质基微粒稳定的Pickering乳液的发展前景进行展望。     

Pickering乳液法制备硼亲和微球及其吸附木樨草素性能研究

研究采用纳米Al2 O3粒子稳定Pickering乳液,3-氨基苯硼酸作为功能单体,制备了具有硼亲和功能的Al2 O3@聚甲基丙烯酸甲酯(Al2 O3@MMA-BA)微球,并用于溶液中木樨草素(LTL)的吸附分离.用扫描电镜、傅里叶变换红外光谱、比表面分析和热重分析等方法探究Al2 O3@MMA-BA微球的理化性质.结...     

Pickering乳液在菊酯类农药水乳液中的应用

通过十六烷基三甲基溴化铵(CTAB)对纳米二氧化硅(Si O2)进行原位疏水化,将其作为乳化剂,以正庚烷作为油相,成功制备了氯菊酯农药水乳液。通过表观照片、分水率、显微镜、流变仪等表征手段测试了Pickering乳液的稳定性和流动性。对制备过程中乳化剂用量、油水比等进行优化,确定了油水比(体积比)为7∶3、CTAB浓度为0. 1 m M、Si O2浓度为0. 7%为乳液最佳制备工艺。所制备的农药水乳液具有良好的应用性能。     

Preparation of Cinnamon Oil‐Loaded Antibacterial Composite Microcapsules by In Situ Polymerization of Pickering Emulsion Templates

In this study, the cinnamon oil (CMO)‐loaded antibacterial composite microcapsules with silicon dioxide (SiO₂)/poly(melamine formaldehyde) (PMF) hybrid shells are effectively and facilely constructed by in situ polymerization of SiO₂ nanoparticle–stabilized Pickering emulsion templates. The morphological structure, composition, and thermal performance of the microcapsules are determined by scanning electronic microscopy, Fourier transform infrared spectroscopy, and thermal gravimetric analysis. In addition, in vitro CMO release and antimicrobial investigations of the microcapsules are also performed, respectively. The results demonstrate that the microcapsules own an approximately spherical shape with a core–shell structure. Moreover, the micro‐encapsulation of CMO clearly increases its thermal stability, and meanwhile results in obtaining microcapsules with the controlled CMO release and visibly long‐term antimicrobial effects. All the results show that in situ polymerization based on templating Pickering emulsions is an attractive method to construct antibacterial essential oil–loaded microcapsules, which can be served as promising antibacterial materials.     

One-step building of molecularly imprinted polymer microcapsules with multicore structure by Pickering emulsion polymerization

Novel molecularly imprinted polymer (MIP) microcapsules with multicore structure were prepared through one step Pickering emulsion polymerization combined with the polymerization driven phase separation. Bisphenol A (BPA) is found to play the part of heterogeneous nuclei besides template molecule, which offers opportunity for the building of the multicore structure inside of MIP microcapsules. The internal structure of MIP microcapsules could be regulated by choosing different kinds of template molecules. Rebinding experiments showed that the MIP with multicore structure possessed excellent binding properties toward BPA. The imprinting factor of MIP toward BPA is 1.96. The binding could reach equilibrium within 30 min. The fast rebinding kinetics was attributed to the unique multicore structure which reduced largely the mass transfer resistance of BPA in the MIP.     

Fabrication of Core/Shell Nanofibers with Desirable Mechanical and Antibacterial Properties by Pickering Emulsion Electrospinning

To endow nanofibers with the desirable antibacterial and mechanical properties, a facile strategy using Pickering emulsion (PE) electrospinning is proposed to prepare functional nanofibers with core/shell structure for the first time. The water‐in‐oil (W/O) Pickering emulsion stabilized by oleic acid (OA)‐coated magnetite iron oxide nanoparticles (OA‐MIONs) is comprised of aqueous vancomycin hydrochloride (Van) solution and poly(lactic acid) (PLA) solution. The core/shell structure of the electrospun Van/OA‐MIONs‐PLA nanofibers is confirmed by scanning electron microscopy and transmission electron microscopy observation. Sustained release of Van from the PE electrospun nanofiber membrane is achieved within the time of 600 h. Compared with the neat PLA electrospun nanofiber membrane, 57% increase of tensile strength and 36% elevation of elongation at break are achieved on PE electrospun nanofiber membrane. In addition, the PE electrospun nanofiber membrane demonstrates excellent antibacterial property stemming from the combinational antibacterial activities of OA‐MIONs and Van. The Van‐loaded PE electrospinning nanofibers with sustained antibacterial performance possess potential applications in tissue engineering and drug delivery.

     

微胶囊的制备方法研究进展

本文介绍了微胶囊的常用天然壁材和微胶囊的制备方法。天然壁材分为碳水化合物、蛋白质和脂类3大类,其中传统天然壁材有海藻酸钠、壳聚糖、明胶等,新型天然壁材包括脂质体、微生物细胞壁(酵母菌细胞壁)、多孔淀粉等。微胶囊的常规制备方法包括:复凝聚法、单凝聚法、界面聚合法、原位聚合法、锐孔-凝固浴法、喷雾干燥法等,微胶囊的新型制备方法有:分子包埋法、微通道乳化法、超临界流体快速膨胀法、酵母微胶囊法、层-层自组装法、模板法等。但是微胶囊技术还存在诸多不成熟之处,有些关键问题还有待解决。     

皮革涂料用丙烯酸酯核-壳乳液的研制

采用种子乳液聚合法，以交联型软性聚合物为核，交联型硬性高聚物为壳，合成了具有优异耐寒性及高温抗回粘性聚合物。讨论了乳化剂种类及应用、核／壳比等对聚合物性能的影响。     

微流控法以单乳为模板制备单分散中空微囊的研究

单分散中空微囊在化工、医药、生物技术等领域有着广阔的应用前景。本文采用微流控技术制备了含甲基丙烯酸β羟乙酯和甲基丙烯酸甲酯两种单体的单分散水包油（O／W）乳液,并以此为模板,在致孔剂的作用下,光引发聚合成功制备了单分散聚甲基丙烯酸β羟乙酯-甲基丙烯酸甲酯的中空微囊。用光学显微镜和扫描电子显微镜对微囊进行系统的表征,结果表明,微囊的粒径在40μm左右,尺寸分布较窄,具有良好的单分散性,微囊外表面光滑,内表面粗糙,囊壁较薄,为中空结构。本研究中提出的方法为单分散中空微囊的制备提供了一条新的途径。     

棕榈酸/二氧化硅相变微胶囊的制备及性能研究

采用乳液模板自组装法通过界面缩聚制备了以棕榈酸(PA)相变材料为核、二氧化硅(SiO2)为壳的相变微胶囊,研究了不同核/壳质量比对PA/SiO2相变微胶囊的表面形貌、微观结构、相变储能性能、热稳定性和热循环性能的影响规律。结果表明,随着核/壳质量比的增加,PA/SiO2相变微胶囊呈现更完整的核/壳结构和更均匀的球形外观,其最佳核/壳质量比为60/40;所形成的微胶囊的最高相变储热能力可达98. 78%;致密SiO2包覆层的形成能够有效阻止相变芯材融化后的泄露和流失,同时也提升了相变微胶囊的热稳定性能,该相变微胶囊在快速热冲击下仍保持良好的形态稳定性,并展示了良好的相变可逆性和相变耐久性,该相变微胶囊可广泛应用于工业及民用各领域的潜热储存和热管理。     

新型核-壳结构丙烯酸酯乳胶涂料

采用无皂种子乳液聚合合成出聚甲基丙烯酸甲酯（ＰＭＭＡ）为核,聚丙烯酸正丁酯（Ｐｎ－ＢＡ）为壳的复合乳液,并以此乳液为基材配制出性能优良的建筑外用乳胶涂料。研究了单体配比、增稠剂用量、ｐＨ值等因素对涂料性能的影响。