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微胶囊化相变材料的制备与评价方法 总被引:1,自引:1,他引:1
微胶囊化相变材料(MCPCM)是将微胶囊技术应用于相变材料而形成的新型复合材料,具有广阔的应用前景,现已成为相变材料应用研究领域的热点。该文综述了MCPCM的4种主要制备方法——原位聚合法、界面聚合法、凝聚法和喷雾干燥法的原理及国内外研究情况。总结了MCPCM的评价方法,将文献中常见的评价指标分成了两类,即"与制备有关的评价指标"和"与应用有关的评价指标",并介绍了相应的表征手段。指出了MCPCM在选材、制备及评价等方面存在的问题和今后的研究方向。 相似文献
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《玻璃钢/复合材料》2020,(4)
相变材料的渗透性和低导热性能限制了相变材料的热控使用。本文基于航天器热控领域需求,开展了以原位聚合法制备正十八烷相变微胶囊产品的优化技术研究,归纳总结了低温相变微胶囊材料导热增强改进的方法,展示了相变微胶囊复合材料已在航天热控领域的多方面应用,提出了相变微胶囊材料今后的研究方向。 相似文献
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微胶囊相变材料(MCPCM)利用微胶囊技术将相变材料包覆实现功能化,避免其泄漏及团聚问题,拓展了其应用范围,因而具有很大的应用前景。本文从制备方法出发,首先介绍了MCPCM的芯材和壳材,详细阐述了喷雾干燥法、溶胶-凝胶法、复凝聚法、界面聚合法、原位聚合法、悬浮聚合法和微乳液聚合法的原理及方法。围绕上述方法,文中阐述了MCPCM的微观形貌,并分析了粒径分布、包覆率、芯壳比对MCPCM储热和热稳定性等性能的影响。同时,概括了MCPCM在建筑节能、蓄热调温纺织、军事航空、能源利用等领域中的应用。最后,对微胶囊相变材料的研究方向进行了展望。 相似文献
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以三聚氰胺?甲醛树脂为胶囊壁材、固液复配石蜡为胶囊芯材,采用原位聚合法制备了用于自内冷溶液除湿的相变材料微胶囊,研究了单一或不同类型乳化剂复配、乳化剂用量对相变材料微胶囊粒径、微观形貌及热性能的影响. 结果表明,非离子乳化剂NP-10与阴离子乳化剂SDBS复配所制微胶囊相变潜热较低,非离子乳化剂Span80和Tween80按质量比1:1复配、乳化剂占芯材质量的60%、乳化转速为1000 r/min时,所制微胶囊综合性能最佳,表面光滑致密,分散性良好,粒径均一,平均粒径为0.45 ?m,相变潜热为52.48 J/g,囊芯含量为58.44%,相变温度适用于以LiCl溶液为除湿剂的自内冷溶液除湿系统. 相似文献
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乙二醇双硬脂酸酯/PMMA核壳储能微胶囊制备 总被引:1,自引:0,他引:1
以BPO-DMA为氧化还原引发剂,在室温下悬浮聚合法制备了核壳结构的乙二醇双硬脂酸酯(EGDS)- PMMA相变材料微胶囊。采用扫描电镜(SEM)、红外光谱仪(FTIR)、差示扫描量热仪(DSC)和热重分析仪(TG)表征了核壳结构微胶囊的形貌、化学结构及热性能。结果表明,当BPO加入量为1%,DMA为0.2% 时,所得微胶囊成均匀球形,粒径分布在1~5 μm范围;微胶囊相变潜热随芯壳比的增加而增大,最大相变潜热达85.34 J/g,芯材含量达64.6%,且相变材料的热稳定性显著增强。 相似文献
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The polyacrylonitrile‐methyl acrylate (AN/MA mole ratio 100/0–70/30) copolymers and copolymers (AN/MA mole ratio 85/15) containing up to 40 wt % of microencapsulated n‐octadecane (MicroPCMs) are synthesized in water. The MicroPCMs were incorporated at the step of polymerization. The effect of the MA mole ratio and MicroPCMs content on structures and properties of the copolymers were studied by using Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H NMR), scanning electronic microscope (SEM), differential scanning calorimetry (DSC), thermogravimetry analysis (TG), gel permeation chromatography (GPC), and X‐ray diffraction (XRD). The feeding ratio agreed well with the composition of the AN/MA copolymers. The copolymers are synthesized in the presence of MicroPCMs. The melting point moves to lower temperature (206°C), while the decomposition temperature moves to higher temperature (309°C) with increasing of the MA mole ratio and microcapsules content. The number–average molecular weight of the copolymer is ~30,000. The crystallinity of the copolymer decreases with increasing of the MA mole ratio and microcapsules content. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2776–2781, 2007 相似文献
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叙述了有机-无机杂化复合材料溶胶-凝胶法、原位聚合法、共混法等制备方法。介绍了基于膜内层叠原理的有机-无机杂化复合材料制备新方法,该方法可以避免无机基团分布不均匀、无机基团难可控取向的缺点,将在有机-无机复合材料制备中发挥重要的作用。 相似文献
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An in‐situ polymerization process prepared a series of melamine formaldehyde (MF) microcapsules containing phase change material (PCM) as core material. The phase change temperature of this PCM was 24°C and its phase transition heat was 225.5 J/g. The microencapsulated phase change materials (MicroPCMs) were bedded in indoor‐wall materials to store and release heat energy, which would economize heat energy and make the in‐door condition comfortable. We investigated the structural formation mechanism by microscope and scanning electron microscopy (SEM). The superficial morphology measurements indicated the optimal shell material dropping rate 0.5 mL min?1, double‐shell, and temperature elevating speed 2°C/10 min. The results obtained in the present investigation were reasonably understood on the basis of getting determinate rigidity and compacted shell. Also, the observed results were used to control the mass of shell material to get desired thickness of shell. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 2006 相似文献
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Wang Huimin Mei Minghua Jiang Yongcai Li Qingshan Zhang Xiaohong Wu Shikang 《Polymer International》2002,51(1):7-11
The preparation of polymer/montmorillonite intercalation composite materials was studied by two kinds of photo‐polymerization reaction (photo‐acid generation and photo‐radical generation). Small‐angle X‐ray diffraction was used for the structural characterization of montmorillonite contained in the products. Results indicated that, after chemical modification of montmorillonite, the monomer (methyl methacrylate) and the prepolymer (m‐cresol/HMMM) were able to intercalate into the layers of clay and to polymerize ‘in situ’, thus producing photo‐polymerized composite materials. The advantages and shortcomings of the method of photo‐polymerization for the preparation of these composite materials are discussed. © 2001 Society of Chemical Industry 相似文献