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首页> 外文期刊>Chemistry: A European journal >Swelling and shrinking of polyelectrolyte microcapsules in response to changes in temperature and ionic strength
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Swelling and shrinking of polyelectrolyte microcapsules in response to changes in temperature and ionic strength

机译：聚电解质微胶囊的溶胀和收缩响应温度和离子强度的变化

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摘要

Swelling and shrinking of polyelectrolyte microcapsules consisting of poly(styrene sulfonate, sodium salt) (PSS) and poly(diallyldimethyl ammonium) chloride (PDADMAC) multilayers have been observed in response to temperature and electrolyte exposure, respectively. Heat-induced capsule swelling and capsule wall volume reduction were observed by confocal laser scanning microscopy (CLSM) and scanning force microscopy (SFM). On the other hand, pronounced shrinking in diameter induced by exposure to an electrolyte was observed in parallel to increases in the thickness of the capsule wall. The estimated wall volume was reduced to two thirds of the control for the salt-exposed capsules and one half for the salt-exposed and simultaneously annealed capsules. This reduction in volume was supposedly mainly caused by the compression of the capsule wall due to the ionic screening from the electrolyte. The highly porous microstructure of the multilayers and loosely bound PSS/PDADMAC complex are thought to be responsible for the structure of the PSS/PDADMAC capsules being easily modulated upon annealing and salt-exposure.
机译：分别响应于温度和电解质暴露，已经观察到由聚（苯乙烯磺酸盐，钠盐）（PSS）和聚（二烯丙基二甲基铵）氯化物（PDADMAC）多层组成的聚电解质微胶囊的溶胀和收缩。通过共聚焦激光扫描显微镜（CLSM）和扫描力显微镜（SFM）观察到热诱导的囊肿和囊壁容积减少。另一方面，与胶囊壁的厚度增加并行地观察到由暴露于电解质引起的直径的显着收缩。对于暴露于盐的胶囊，估计的壁体积减小到对照的三分之二，对于暴露于盐并同时退火的胶囊，壁的体积减小到对照的三分之二。据推测，这种体积减小主要是由于从电解质中进行离子筛选而导致的囊壁压缩所致。多层的高度多孔的微观结构和松散结合的PSS / PDADMAC复合物被认为是PSS / PDADMAC胶囊的结构易于退火和盐分暴露的原因。

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