Trilayered Morphology of an ABC Triple Crystalline Triblock Terpolymer
Trilayered Morphology of an ABC Triple Crystalline Triblock Terpolymer
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DOI：
10.1021/acs.macromol.7b01576
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发表时间：
2017-09
期刊：
影响因子：
5.5
通讯作者：
Jordana K. Palacios;A. Tercjak;Guoming Liu;Dujing Wang;Junpeng Zhao;N. Hadjichristidis;A. Müller
中科院分区：
文献类型：
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作者：
Jordana K. Palacios;A. Tercjak;Guoming Liu;Dujing Wang;Junpeng Zhao;N. Hadjichristidis;A. Müller
三晶三嵌段共聚物是一类具有显著半晶超结构的材料。在这项工作中，我们首次报道了由聚环氧乙烷(PEO)、聚己内酯(PCL)和聚L-丙交酯(PLLA)组成的三嵌段共聚物在球晶内自组装的交替三层片层形态。比较了PEO-b-PCL-b-PLLA三嵌段共聚物与类似的PCL-b-PLLA两嵌段共聚物的形态。二块和三块在熔体中形成单一相。两种结晶方案被用来产生特殊的结晶形态。在这两种情况下，首先诱导聚乳酸嵌段的等温结晶(在81℃，高于PCL和PEO嵌段的熔点)，然后PLLA球晶形成模板，然后冷却其他两个嵌段可以在PLLA片层间空间内结晶。WAXS分析证实了材料的双晶性和三晶性。层状结构..。
Triple crystalline triblock terpolymers are materials with remarkable semicrystalline superstructures. In this work, we report for first time the alternating triple lamellar morphology that self-assembles inside spherulites of a triblock terpolymer composed of poly(ethylene oxide) (PEO), poly(e-caprolactone) (PCL), and poly(l-lactide) (PLLA). The morphology of the PEO-b-PCL-b-PLLA triblock terpolymer is compared to an analogous PCL-b-PLLA diblock copolymer. Both diblock and triblock form a single phase in the melt. Two crystallization protocols were employed to create particular crystalline morphologies. In both cases, the isothermal crystallization of the PLA block is induced first (at 81 °C, a temperature above the melting points of both PCL and PEO blocks) and PLLA spherulites form a template, whereupon cooling the other two blocks can crystallize within the PLLA interlamellar spaces. WAXS analysis demonstrated the double crystalline and triple crystalline nature of the materials. The lamellar structur...