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Preparation and evaluation of thermo sensitive microcapsules using double tube nozzle

机译：双管喷嘴热敏微胶囊的制备与评价

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Thermo-responsive microcapsule consisted of N-isopropyl acrylamide (NIPAAm) and alginate was prepared using double tube nozzle. In this method, NIPAAm and alginate were used as thermo-responsive polymer and structural support polymer, respectively. In the experiment, the solution which contained NIPAAm monomer, cross-linking agent and sodium alginate was pumped out from outer tube, and cocoa suspension as marker was pumped out from inner tube of the double tube nozzle to form droplets of double layered structure. The formed droplets were then dropped into consolidation solution which contained polymerization initiator, promoter and CaCl2. In the solution, at first gellation and consolidation of the alginate in the outer layer of the droplet occurred due to the calcium cation cross-linking of the alginate molecules and it formed structural support matrix of the capsule. Then, NIPAAm monomers were polymerized within the alginate gell layer, and thermo-responsive microcapsules were obtained.In the experiment, the effect of the flow rate of the solution from the outer tube (Fout) and that from the inner tube (Fin) on the size and shell thickness of the capsules was examined. The result showed that the size of the capsule increased and the shell thickness decreased with the increase of the flow rate ratio (Fin/ Fout) and they are not dependent on the absolute value of the flow rates in the range used in this study (15-60 mL/h). However, when the flow rate ratio (Fin/Fout) exceeded 0.45, formation of the capsule became difficult. Temperature- responsive volume change of the capsules was also measured. The result showed that the capsule started to shrink when the temperature increased, and it swollen when the temperature decreased. The temperature responsive volume change was reversible and the swelling ratio changed from 15-40 % depending on the conditions that if the NIPAAm polymer in the capsules or beads were crosslinked or not.
机译：使用双管喷嘴制备由N-异丙基（NIPAAM）和藻酸盐组成的热响应微胶囊。在该方法中，分别用作热响应聚合物和结构支撑聚合物的NIPAAM和藻酸盐。在实验中，将含有NIPAAM单体，交联剂和藻酸钠的溶液从外管泵出，并且从双管喷嘴的内管中泵出作为标记的可可悬浮液，以形成双层结构的液滴。然后将形成的液滴滴入含有聚合引发剂，启动子和CaCl 2的固结溶液中。在溶液中，在液滴的外层中，在液滴的外层中的第一次胶凝并固结由于藻酸盐分子的钙阳离子交联并且形成胶囊的结构支撑基质。然后，将Nipaam单体在藻酸盐胶层中聚合，获得热响应微胶囊。在实验中，溶液流速从外管（FOUT）的流速与内管（翅片）的影响检查胶囊的尺寸和外壳厚度。结果表明，胶囊的尺寸增加，壳体厚度随着流速比（鳍/换档）的增加而降低，它们不依赖于本研究中使用的范围内流量的绝对值（15 -60 ml / h）。然而，当流量比（鳍/换档）超过0.45时，胶囊的形成变得困难。还测量胶囊的温度响应体积变化。结果表明，当温度升高时，胶囊开始收缩，并且当温度降低时它肿胀。温度响应体积变化是可逆的，溶胀比率从15-40％变化，这取决于如果胶囊或珠子中的NIPAAM聚合物与之交联。

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