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：利用偏振选择性反应诱导各向异性相分离聚合物共混物，并建立聚合物共混物形态控制的新方法。第一个目的是通过使用线偏振光选择性诱导聚合物共混物组分之间的化学反应来实现。通过这样做，浓度波动的空间对称性被破坏，导致各向异性相分离。为了阐明这种对称性破坏过程对反应共混物形态的影响，我们研究了两种典型的聚合物共混物。实验中使用了交联和非交联反应，以方便实验，使用了众所周知的较低临界溶液温度的聚苯乙烯（P5 和聚（乙烯基甲基醚）（PVME）的混合物。本研究项目仅使用了 PS 成分，通过使用花烯 (PSA) 或二苯乙烯 PS/P 进行标记。 VME 共混物通过蒽的光二聚作用或 PSS 链上标记的二苯乙烯部分的光异构化而导致 PSA 链之间的交联反应器失稳。通过用线性辐射 PSA/PVME 和 PSS/PVME 两种共混物获得以下结果。偏振紫外光：[1] 照射后，发生各向异性相分离，产生定向的片状形态几乎垂直于线偏振光的方向（E），对于光交联体系，沿着垂直于（E）的方向相分离进行得更快，而沿着平行于（E）的方向则相分离进展最快。 [2] 所有辐照共混物在不同的偏振方向上表现出不同的临界点。通过将这些动力学数据与获得的结果进行比较，相分离沿不同的方向进行。用非偏振光照射，发现在一定照射下出现的形态是不同不稳定性沿不同方向传播的干涉过程的结果。