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Study of the dynamic structure of microphase separation by X-ray small angle scattering using the CCD type X-ray detector

利用CCD型X射线探测器研究X射线小角散射微相分离的动态结构

基本信息

批准号：
12450004
负责人：
AMEMIYA Yoshiyuki
金额：
$ 1.15万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

The orientation of lamellar structure in block copolymers behaves differently under oscillatory shear with different conditions. For example, the lamellar structure of polystyrene-polyisoprene di-block copolymer is orientated in either perpendicular or parallel or transverse under oscillatory shear, depending on its frequency and its amplitude and temperature. The orientation behavior is also dependent on time course of the oscillatory shear. If the underlying mechanism of this behavior is clarified, this behavior is tailored so that new mechanical properties can be designed. Therefore, it is important to investigate the relation of nano-scale structure (molecular structure) and oscillatory shear condition (frequency, temperature, strain ).In this study, we have developed a high-sensitivity CCD X-ray detector which enables us to record time-resolved small-angle X-ray scattering patterns with a sub-second time resolution. Next, we have developed a shearing machine which may let an X-ray beam pass through with different three orthogonal directions while applying oscillatory shear to polymer sample. With the above apparatus combined, we have successfully observed the orientation behavior of the lamellar structure in block copolymer of polystyrene and polyisoprene under oscillatory shear with time-resolved small angle X-ray scattering technique using synchrotron radiation.

嵌段共聚物中层状结构的取向在不同条件下的振荡剪切下表现不同。例如，聚苯乙烯-聚异戊二烯二嵌段共聚物的层状结构在振荡剪切下以垂直或平行或横向取向，具体取决于其频率及其振幅和温度。取向行为还取决于振荡剪切的时间进程。如果阐明了这种行为的根本机制，则可以定制这种行为，以便设计新的机械性能。因此，研究纳米级结构（分子结构）与振荡剪切条件（频率、温度、应变）之间的关系非常重要。在这项研究中，我们开发了一种高灵敏度CCD X射线探测器，使我们能够以亚秒级时间分辨率记录时间分辨的小角度X射线散射图案。接下来，我们开发了一种剪切机，它可以让X射线束通过不同的三个正交方向，同时对聚合物样品施加振荡剪切。结合上述装置，我们利用同步辐射的时间分辨小角X射线散射技术，成功地观察到了聚苯乙烯和聚异戊二烯嵌段共聚物中层状结构在振荡剪切作用下的取向行为。