Ladelta Viko, Zapsas George, Abou-Hamad Edy, Gnanou Yves, Hadjichristidis Nikos
Polymer Synthesis Laboratory, KAUST Catalysis Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.
Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.
Angew Chem Int Ed Engl. 2019 Nov 4;58(45):16267-16274. doi: 10.1002/anie.201908688. Epub 2019 Sep 18.
Multicrystalline block polymers having three or more crystalline segments are essential materials for the advancement of physics in the field of crystallinity. The challenging synthesis of multicrystalline polymers has resulted in only a limited number of tricrystalline terpolymers having been reported to date. We report, for the first time, the synthesis of polyethylene-b-poly(ethylene oxide)-b-poly(ϵ-caprolactone)-b-poly(l-lactide) (PE-b-PEO-b-PCL-b-PLLA), a tetracrystalline tetrablock quarterpolymer, by combining polyhomologation, ring-opening polymerization, and an organic/metal "catalyst switch" strategy. H NMR spectroscopy and gel-permeation chromatography confirmed the formation of the tetrablock quarterpolymer, while differential scanning calorimetry, X-ray diffraction, and wide-line separation solid-state NMR spectroscopy revealed the existence of four different crystalline domains.
具有三个或更多结晶链段的多晶嵌段聚合物是结晶度领域物理学进步的关键材料。多晶聚合物具有挑战性的合成方法导致迄今为止仅有数量有限的三晶三元共聚物被报道。我们首次报告了通过结合多聚同系化、开环聚合和有机/金属“催化剂切换”策略合成了聚乙烯-b-聚环氧乙烷-b-聚己内酯-b-聚丙交酯（PE-b-PEO-b-PCL-b-PLLA），一种四晶四嵌段四聚物。核磁共振氢谱和凝胶渗透色谱法证实了四嵌段四聚物的形成，而差示扫描量热法、X射线衍射和宽线分离固态核磁共振光谱揭示了四种不同结晶域的存在。
