论文标题
嵌入金属氧化物纳米颗粒的热重复二嵌段共聚物的结构和性能
Structure and Properties of Thermoresponsive Diblock Copolymers Embedded with Metal Oxide Nanoparticles
论文作者
论文摘要
纳米结构的聚合物 - 金属氧化物复合材料是当前非常重要的研究领域，因为它在传感器，光学元件，催化剂和药物输送中的重点应用。特别是使用热响应聚合物在聚合物模板的设计和构建方面具有更多的灵活性和可能性。在本研究中，由两种聚苯乙烯 - 块状聚合物（N-异丙基丙烯酰胺）（PS-B-PNIPAM）Diblock共聚物（DBC）组成的杂交金属氧化物/DBC膜的结构和磁性特性分别作为主要的聚合物结构域，并将其作为主要的聚合物域，并研究了Iroxiid。热响应性PNIPAM在32°C下的水溶液中具有较低的临界溶液温度（LCST），这可以使PS和PNIPAM在PS-B-PNIPAM二嵌段共聚物（DBC）结构中具有可控的体积比。因此，设计和建造了一个温度和湿度控制电池，用于精确调整PS-B-PNIPAM DBC的块结构，该结构通过位于原位的小角度X射线散射（SAXS）和擦伤的小角度X射线X射线散射（GISAXS）测量进行了研究。使用超导量子干扰装置（squid）磁力计研究了热处理杂化铁氧化铁/pS-b-PNIPAM DBC膜的超顺磁行为。
Nanostructured polymer-metal oxide composites are a current research area of great importance due to its highlight applications in sensors, optics, catalysts and drug delivery. Particularly the use of thermoresponsive polymers gives more flexibilities and possibilities in the design and construction of polymer templates. In the present investigation, the structure and magnetic properties of hybrid metal oxide/DBC films composed of two kinds of polystyrene-block-poly (N-isopropylacrylamide)(PS-b-PNIPAM) diblock copolymers (DBCs) with PS and PNIPAM as the major polymer domains respectively, and iron oxide were investigated. The thermoresponsive PNIPAM has a lower critical solution temperature (LCST) in aqueous solution at 32°C, which enables the controllable volume ratio of PS and PNIPAM in the structure of PS-b-PNIPAM diblock copolymers (DBCs). Thus, a temperature and humidity controlling cell was designed and built for precisely tuning the block structure of PS-b-PNIPAM DBCs, which was investigated by in-situ small-angle X-ray scattering (SAXS) and grazing-incidence small-angle X-ray scattering (GISAXS) measurements. The superparamagnetic behavior of the heat-treated hybrid iron oxide/PS-b-PNIPAM DBC films was investigated using a superconducting quantum interference device (SQUID) magnetometer.
