Kietzke Thomas, Neher Dieter, Kumke Michael, Ghazy Omayma, Ziener Ulrich, Landfester Katharina
Institute of Physics, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany.
Small. 2007 Jun;3(6):1041-8. doi: 10.1002/smll.200600606.
Polymer blends in nanoparticles have been studied by transmission electron microscopy (TEM) and photoluminescence (PL) spectroscopy. The TEM studies show that blend particles formed from two immiscible polymers by the miniemulsion process exhibit biphasic morphologies. The fact that no core-shell type but Janus-like structures were found indicates that the surface free energies between both polymers and the solution-water interface (including the surfactant molecules) are similar; therefore, the blend morphology and composition of the individual phases are mainly determined by the interaction between the two polymer components. Both the TEM studies and the PL experiments provide strong evidence that phase separation in these particles strictly follows the Flory-Huggins theory. This highlights the applicability of the nanoparticle approach to fabricate blend systems with well-controllable properties and to study structure-property relationships under well-defined conditions.
通过透射电子显微镜（TEM）和光致发光（PL）光谱对纳米颗粒中的聚合物共混物进行了研究。TEM研究表明，通过微乳液法由两种不相容聚合物形成的共混颗粒呈现双相形态。未发现核壳型结构而发现类Janus结构这一事实表明，两种聚合物与溶液-水界面（包括表面活性剂分子）之间的表面自由能相似；因此，共混物的形态和各相的组成主要由两种聚合物组分之间的相互作用决定。TEM研究和PL实验均提供了有力证据，证明这些颗粒中的相分离严格遵循弗洛里-哈金斯理论。这突出了纳米颗粒方法在制备具有可控性能的共混体系以及在明确条件下研究结构-性能关系方面的适用性。
