Travasso Rui D M, Kuksenok Olga, Balazs Anna C
Langmuir. 2005 Nov 22;21(24):10912-5. doi: 10.1021/la052511a.
Computer simulations reveal how photoinduced chemical reactions in polymeric mixtures can be exploited to create long-range order in materials with features that range from the submicron to the nanoscale. The process is initiated by shining a spatially uniform light on a photosensitive AB binary blend, which thereby undergoes both a reversible chemical reaction and a phase separation. When a well-collimated, higher intensity light is rastered over the sample, the system forms defect-free, spatially periodic structures. If a nonreactive homopolymer C is added to the system, this component localizes in regions that are irradiated with a higher intensity light, and one can effectively "write" a pattern of C onto the AB film. Rastering over the ternary blend with the collimated light now leads to hierarchically ordered patterns of A, B, and C. Because our approach involves homopolymers, it significantly expands the range of materials that can be fashioned into a periodic pattern. The findings point to a facile process for manufacturing high-quality polymeric components in an efficient manner.
计算机模拟揭示了如何利用聚合物混合物中的光致化学反应，在具有从亚微米到纳米尺度特征的材料中创造长程有序结构。该过程通过将空间均匀的光照射在光敏AB二元共混物上启动，从而使其经历可逆化学反应和相分离。当一束准直的高强度光在样品上扫描时，系统会形成无缺陷的空间周期性结构。如果向系统中添加非反应性均聚物C，该组分就会定位在高强度光照射的区域，这样就可以有效地将C的图案“写入”AB薄膜中。现在用准直光在三元共混物上扫描会产生A、B和C的分层有序图案。由于我们的方法涉及均聚物，它显著扩展了可制成周期性图案的材料范围。这些发现指出了一种以高效方式制造高质量聚合物部件的简便方法。
