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首页> 外文会议>International conference on polymer-solvent complexes and intercalates >Reorganization of the Structures, Morphologies, and Conformations of Polymers by Coalescence from Their Crystalline Inclusion Compounds Formed with Cyclodextrins
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Reorganization of the Structures, Morphologies, and Conformations of Polymers by Coalescence from Their Crystalline Inclusion Compounds Formed with Cyclodextrins

机译：通过与环糊精形成的结晶包容化合物的聚结的结构，形态和聚合物的构象重组

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We and several other research groups have recently reported the ability of cyclodextrins (CDs) to act as hosts in the formation of inclusion compounds (ICs) with guest polymers. Polymer-CD-ICs are crystalline materials formed by the close packing of host CD stacks, which results in a continuous channel of ～5-10A in diameter running down the interior of the CD stacks. The guest polymers are confined to the narrow, continuous CD channels, and so are necessarily highly extended and segregated from neighboring polymer chains by the walls of the CD stacks. We have shown that coalescence of guest polymers from their CD-IC crystals can result in a significant reorganization of the structures, morphologies, and even conformations that are normally observed in their bulk samples. For example, when poly(ethylene terephthalate) (PET) is coalesced from its γ-CD-IC, we find that in the non-crystalline regions of the sample the PET chains are adopting highly extended kink conformations, which result in their facile recrystallization from the melt and prevent quenching of the coalesced PET to achieve an amorphous sample during rapid cooling from above T_m. We have also created well-mixed blends of normally incompatible polymers by coalescing them from CD-ICs containing both polymers, where they are necessarily spatially proximal. Finally we have found the unique morphologies created by the coalescence of homopolymers, block copolymers, and homopolymer pairs from their CD-ICs are generally stable to heat treatment for substantial periods above their T_m's and/or T_g's, and so may be thermoplastically processed without loss of the unique morphologies achieved through coalescence from their CD-IC crystals.
机译：我们和其他几个研究组最近报告了环糊精（CDS）作为宿主在与客人聚合物形成包容化合物（ICS）的能力。聚合物 - CD-IC是由宿主CD堆叠的紧密填充形成的晶体材料，这导致连续通道直径〜5-10A的直径沿着CD堆叠的内部运行。客人聚合物被限制在窄，连续的CD通道上，因此必须通过CD叠层的壁从相邻聚合物链中高度延伸和隔离。我们已经表明，来自其CD-IC晶体的客体聚合物的聚合物可导致结构，形态，甚至在其散装样品中通常观察到的构象的重大重组。例如，当聚（对苯二甲酸乙二醇酯）（PET）从其γ-CD-IC结合时，发现在样品的非晶区域中，宠物链正在采用高度延长的扭结构象，这导致它们的共聚重结晶从熔体和防止聚结剂的淬火，在从高于T_M的快速冷却过程中达到无定形样品。我们还通过将它们从包含两个聚合物的CD-IC结合的CD-IC结合来创造了通常不相容的聚合物的混合混合物。它们必须在空间上近端。最后，我们发现了由均聚物，嵌段共聚物的聚结产生的独特形态，并且来自其CD-IC的均聚物对通常是稳定的，在其T_M和/或T_G的大量时期的热处理通常是稳定的，因此可以在没有损失的情况下热塑性加工通过从CD-IC晶体聚结实现的独特形态。

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