Dynamics and Morphology of Anisotropic Phase Separation of Polymar Blends Cross-linked by Unearly Polarized light.

早期偏振光交联的 Polymar 共混物各向异性相分离的动力学和形态。

基本信息

批准号：
09650998
负责人：
MIYATA Takaaki
金额：
$ 2.18万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

This research project has two purposes : inducing anisotropic phase separation polymer blends by taking advantages of polarization-selective reactions and establishing novel method for morphology control of polymer blends. The first purpose was attained by using linear polarized light to selectively induce chemical reactions between component of binary polymer blends. By doing so, the spatial symmetry of concentration fluctuations is broken, leading to anisotropic phase separation. In order to elucidate the consequence of this symmetry breaking process on the resulting morphology of the reacting blends, two typical reactions, i.e. cross-linking and non-cross-linking , were utilized in the experiments. To facilitate the experiments, mixtures of polystyrene (P5 and poly(vinyl methyl ether) (PVME) which have a well-known lower critical solution temperature (LCST), were used in this research project. Only the PS component was chemically modified for the purpose by labeling with either anth … More racene (PSA) or tram-stilbene (PSS). PS/P VME blends were destabilized by either the cross-linking reactor between PSA chains via photodimerization of anthracene or the photoisomerization of the stilbene moieties labeled on the PSS chains. The following results were obtained b irradiating the two blends PSA/PVME and PSS/PVME with linearly polarized uv light :[1] Upon irradiation, anisotropic phase separation takes place, giving lamella-like morphologies orienting almost perpendicular to the direction (E) of the linearly polarize light, For the photo-cross-linking systems, the phase separation proceeds faster along the direction perpendicular to (E), whereas it evolves fastest along the direction parallel I (E) for the photoisomerizing system.[2] All the irradiated blends exhibit different critical points at different orientation with respect to the polarization (E). The phase separation proceeds with different rates along different orientations. By comparing these kinetic data with the results obtained b irradiation with unpolarized light, it was found that the morphology emerging at a certain irradiation is the consequence of an interference process of different instabilities propagating along different orientations. Less

该研究项目有两个目的：通过利用极化选择性反应并建立对聚合物混合物形态控制的新方法来诱导各向异性相分离聚合物混合物。第一个目的是通过使用线性极化光选择性地诱导二元聚合物混合物组成之间的化学反应来附着的。通过这样做，浓度波动的空间对称性被损坏，导致各向异性相分离。为了阐明这种对称破坏过程对反应混合物的形态的后果，在实验中使用了两个典型的反应，即交联和非交联反应。为了促进实验，在该研究项目中使用了具有众所周知的较低临界溶液温度（LCST）的聚苯乙烯（p5和乙烯基甲基乙醚）（p5和乙烯基甲基乙醚）（PVME），仅在PS成分中进行化学修改，以通过使用ANTH（PSA）或TRAM-Stilbene（PSS）（PSS）（PSS）（PSS）来进行化学修改，以实现该目的。 PSA链之间的交联反应器通过蒽的光二聚化或在PSS链上标记的Silbene部分的光异构化。定向几乎垂直于线性极化光的方向，对于光线链接系统，沿垂直于（e）的方向更快地进行了相位，而它沿着（e）的方向沿方向i（e）的方向最快地进化，以使光相位化的系统与隔离式的隔离式相差不同。[2]相位分离以不同的方向进行不同的速率进行。通过将这些动力学数据与获得的结果与非极化光所获得的结果进行比较，发现在某种辐射下出现的形态是沿不同方向传播不同不稳定性的干扰过程的结果。较少的