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首页> 外文期刊>Journal of Applied Polymer Science >Effects of end groups on the thermal response of poly(N- isopropylacrylamide) microgels
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Effects of end groups on the thermal response of poly(N- isopropylacrylamide) microgels

机译：端基对聚（N-异丙基丙烯酰胺）微凝胶热响应的影响

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摘要

Poly(N-isopropylacrylamide) (PNIPAM) microgels were prepared through soap-free emulsion polymerization using 2, 2′- azobisobutyronitrile and potassium persulfate as initiator respectively. The thermal response of microgels was researched by measuring the transmittance and the hydrodynamic diameter of the microgels at different temperatures. The result shows that the different structure of the end groups of polymer that come from residues of initiator result in the different thermal response of PNIPAM microgels. The LCST (lower critical solution temperature) of AIBN-initiator microgels is 5°C lower than that of the KPS-initiator microgels, whereas the AIBN-initiated PNIPAM microgels have better thermal response sensitivity. The scanning electron microscope characterization shows that the morphology of AIBN-initiated PNIPAM microgels is more regular than that of KPS-initiated. Furthermore, the T _g of the microgels was measured by differential scanning calorimeter and the result indicates that the end groups influences the T_g of microgels severely. This work demonstrated that the hydrophobic end group coming from initiators can decreases the LCST of PNIPAM microgels and increases the thermal response sensitivity, which providing a newly simple but effective method to regulate the thermal response of PNIPAM microgels.
机译：通过无皂乳液聚合分别使用2，2'-偶氮二异丁腈和过硫酸钾作为引发剂，制备了聚（N-异丙基丙烯酰胺）（PNIPAM）微凝胶。通过测量不同温度下微凝胶的透射率和流体动力学直径，研究了微凝胶的热响应。结果表明，源自引发剂残基的聚合物端基结构不同，导致PNIPAM微凝胶的热响应也不同。 AIBN引发剂微凝胶的LCST（较低的临界溶液温度）比KPS引发剂微凝胶的LCST低5°C，而AIBN引发的PNIPAM微凝胶具有更好的热响应敏感性。扫描电子显微镜表征表明，AIBN引发的PNIPAM微凝胶的形态比KPS引发的更为规则。此外，通过差示扫描量热法测量了微凝胶的T_g，结果表明端基对微凝胶的T_g有严重影响。这项工作表明，来自引发剂的疏水端基可以降低PNIPAM微凝胶的LCST并增加热响应灵敏度，这为调节PNIPAM微凝胶的热响应提供了一种新的简单有效的方法。

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