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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Novel microgel-particle colloids: the detailed characterisation of the layer structure and chain topology of silica : poly(NIPAM) core-shell particles
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Novel microgel-particle colloids: the detailed characterisation of the layer structure and chain topology of silica : poly(NIPAM) core-shell particles

机译:新型微凝胶颗粒胶体:二氧化硅的层结构和链拓扑的详细表征:聚(NIPAM)核-壳颗粒

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摘要

A monodisperse core-shell microgel has been synthesised in which silica provides the core (average diameter 1367 Angstrom), and poly(NIPAM) the cross linked shell. Transmission Electron Microscopy and Photon Correlation Spectroscopy (PCS) measurements have confirmed the existence of a thick polymer layer. PCS measurements have shown that the hydrodynamic thickness of the layer is similar to 2450 Angstrom at 25 degrees C, collapsing to 600 Angstrom when heated to 70 degrees C. Small-angle neutron scattering (SANS) experiments on the core-shell microgels show a high volume fraction near the surface and suggest an exponential volume fraction profile. PCS and SANS measurements have also been used to measure the de-swelling of the layer with change in temperature and the results are compared with classical microgel particles. (C) 2000 Elsevier Science Ltd. All rights reserved. [References: 21]
机译:已经合成了单分散的核-壳微凝胶,其中二氧化硅提供了核(平均直径为1367埃),聚(NIPAM)为交联的壳。透射电子显微镜和光子相关光谱法(PCS)测量已确认存在厚的聚合物层。 PCS测量表明,该层的流体力学厚度在25摄氏度时类似于2450埃,在加热至70摄氏度时会塌陷至600埃。核-壳微凝胶上的小角中子散射(SANS)实验表明,靠近表面的体积分数,并显示出指数体积分数分布。 PCS和SANS测量也已用于测量随温度变化而产生的溶胀现象,并将结果与​​经典的微凝胶颗粒进行了比较。 (C)2000 Elsevier ScienceLtd。保留所有权利。 [参考:21]

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