Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA.
Soft Matter. 2023 Jun 21;19(24):4519-4525. doi: 10.1039/d3sm00151b.
The phase behavior of ternary blends composed of two homopolymers (A, B) and their corresponding diblock copolymer (A-B) has been widely studied, with emphasis on the volumetrically symmetric isopleth and the formation of bicontinuous microemulsions. However, almost all the previous studies employed linear polymers, and little is known about the impact of polymer architecture on the phase behavior of such ternary blends. Here, we report the self-assembly of three sets of ternary blends of polystyrene (PS) and poly[oligo(ethylene glycol) methyl ether methacrylate] (POEGMA), with different lengths of oligo(ethylene glycol) side chains . Small-angle X-ray scattering was used to probe the phase behavior at different compositions and temperatures. The order-to-disorder transition temperature was found to be impacted by the side chain length. It was also observed that longer side chains lead to poorer miscibility of homopolymers in the corresponding block, resulting in a more "dry-brush" like swelling behavior.
已经广泛研究了由两种均聚物（A、B）及其相应的嵌段共聚物（A-B）组成的三元共混物的相行为，重点是体积对称等压线和双连续微乳液的形成。然而，几乎所有以前的研究都使用线性聚合物，对聚合物结构对这种三元共混物相行为的影响知之甚少。在这里，我们报告了聚苯乙烯（PS）和聚[寡聚（乙二醇）甲基醚甲基丙烯酸酯]（POEGMA）的三组三元共混物的自组装，其具有不同长度的寡聚（乙二醇）侧链。小角 X 射线散射用于探测不同组成和温度下的相行为。发现侧链长度会影响有序到无序的转变温度。还观察到较长的侧链会导致均聚物在相应嵌段中的相容性变差，从而导致更类似于“干刷”的溶胀行为。
