A systematic study on the reaction mechanisms for the microencapsulation of a volatile phase change material (PCM) via one-step in situ polymerisation
A systematic study on the reaction mechanisms for the microencapsulation of a volatile phase change material (PCM) via one-step in situ polymerisation
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一步原位聚合微胶囊化挥发性相变材料（PCM）反应机理的系统研究
DOI：
10.1016/j.ces.2022.117497
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发表时间：
2022
影响因子：
4.7
通讯作者：
Mustapha A
中科院分区：
文献类型：
--
作者：
Mustapha A
挥发性相变材料（PCM）的微胶囊化是非常具有挑战性的，以实现高负载量和优异的阻隔性能。我们以前的工作表明，在该过程中使用的乳化剂提供了独特的性能，以制定微胶囊。在目前的工作中，水胶体和合成乳化剂的分类，以解决封装过程中的反应机理。具有非常大的有效载荷（高达95.6重量%）的微胶囊生产具有优异的核心保留。讨论了乳化剂的作用，发现乳化剂上的官能团对微胶囊的质量有很大影响。界面张力和界面的流变学没有证明与乳化剂类型的显着相关性，虽然这些因素仍然发挥了一定的作用，在O/W乳液的稳定性。结果表明，间苯二酚是该过程中最稳定的苯二酚类化合物。氯化铵的替代品被开发出来，这表明碳酸铵和硝酸铵也可以成功地用于这一过程。然而，这项工作的主要发现在于证明羧基加快反应速率的程度，UF颗粒变得太大，以保持受控和稳定的沉积到O/W界面上，导致多孔微胶囊。具有羟基的乳化剂产生的UF颗粒太小而不能这样做。中间体反应用胺/酰胺基团或基团的组合显示。这项工作极大地拓宽了对乳化剂如何影响一步原位聚合过程的理解，这反过来又提供了一系列可用的乳化剂，可用于包封其他挥发性芯材内容物。
The microencapsulation of volatile phase change materials (PCMs) is very challenging to achieve high payload and excellent barrier properties. Our previous work indicates that the emulsifiers used in the process offer unique properties to the formulated microcapsules. In the present work, an assortment of hydrocolloid and synthetic emulsifiers were employed to tackle the reaction mechanisms of the encapsulation process. Microcapsules with exceptionally large payloads (up to ∼95.6 wt%) were produced with excellent core retention. The effects of emulsifiers were deliberated, in which it was found that the microcapsule quality is greatly affected by the functional groups located on the emulsifiers. Interfacial tension and interfacial dilatational rheology did not prove a significant correlation with the emulsifier type, although these factors still play a part in the stability of the O/W emulsion. It was conveyed that resorcinol is the most stable dihydroxybenzenes species in this process. Ammonium chloride alternatives were exploited, conveying that ammonium carbonate and ammonium nitrate can also be successfully used in this process. However, the chief finding of this work lies in the proof that carboxyl groups speed up the reaction rate to the extent that the UF particles become too large to maintain controlled and steady deposition onto the O/W interface, leading to porous microcapsules. The emulsifiers with hydroxyl groups created UF particles too small to do so. Intermediate reactions were displayed with amine/amide groups or a combination of groups. This work strongly broadens the understanding of how emulsifiers affect the one-step in situ polymerisation process, which, in turn, provides an array of available emulsifiers that can be used to encapsulate other volatile core material contents.
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影响因子：
4.6
作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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DOI：
10.1002/apmc.1975.050420108
发表时间：
1975
期刊：
Angewandte Makromolekulare Chemie
影响因子：
--
作者：
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通讯作者：
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影响因子：
3.3
作者：
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通讯作者：
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