Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
J Am Chem Soc. 2017 Oct 25;139(42):14869-14872. doi: 10.1021/jacs.7b08627. Epub 2017 Oct 17.
Crystallinity is seldomly utilized as part of the microphase segregation process in ultralow-molecular-weight block copolymers. Here, we show the preparation of two types of discrete, semicrystalline block co-oligomers, comprising an amorphous oligodimethylsiloxane block and a crystalline oligo-l-lactic acid or oligomethylene block. The self-assembly of these discrete materials results in lamellar structures with unforeseen uniformity in the domain spacing. A systematic introduction of dispersity reveals the extreme sensitivity of the microphase segregation process toward chain length dispersity in the crystalline block.
结晶度很少被用作超高分子量嵌段共聚物微相分离过程的一部分。在这里，我们展示了两种离散的半结晶嵌段共低聚物的制备方法，它们由无定形的聚二甲基硅氧烷嵌段和结晶的聚 L-乳酸或聚亚甲基嵌段组成。这些离散材料的自组装导致层状结构，在畴间距上具有意想不到的均匀性。系统地引入分散度表明，微相分离过程对结晶嵌段中链长分散度的极端敏感性。
