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首页> 外文期刊>Macromolecules >Synthesis and properties of polyetherketone-block-polybenzobisthiazole-block-polyetherketone ABA triblock copolymers
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Synthesis and properties of polyetherketone-block-polybenzobisthiazole-block-polyetherketone ABA triblock copolymers

机译：聚醚酮嵌段-聚苯并双噻唑嵌段-聚醚酮ABA三嵌段共聚物的合成及性能

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摘要

As an approach to rigid-rod molecular composites, a series of PEK-b-PBZT-b-PEK ABA triblock copolymers were synthesized. Three different types of polyetherketones (PEKs) as coil A-block units and the carboxylic acid-terminated polybenzobisthiazoles (PBZTs) with two different molecular weights as rigid-rod B-block units were utilized to afford the targeted ABA triblock copolymers. The resulting triblock copolymers were insoluble in common polar aprotic solvents such as N-methylpyrrolidinone, dimethylformamide, dimethylacetamide, and dimethyl sulfoxide but showed greatly improved solubility in strong acids such as trifluoroacetic acid, methanesulfonic acid (MSA), trifluoromethanesulfonic acid, and sulfuric acid. Good quality films could be cast from solutions. Alternatively, we could also process these copolymers by the compression molding technique. The block copolymer samples were simply heated above the transition temperatures of the coil components and pressed into articles with desired shapes. The wide-angle X-ray diffraction study of the selected solution-cast film exhibited a long-range ordering, which is indicative of microphase separation. This was further confirmed by the results from small-angle X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. In addition, the UV-vis absorption behavior of the copolymer solutions implied that the ground state conformations of PBZT in MSA were greatly dependent on the amorphous or the semicrystalline nature of the PEK unit, which has little or no effect on the emission properties.
机译：作为制备刚性棒状分子复合材料的一种方法，合成了一系列PEK-b-PBZT-b-PEK ABA三嵌段共聚物。利用三种不同类型的聚醚酮（PEK）作为线圈A嵌段单元，以及具有两种不同分子量的羧酸封端的聚苯并双噻唑（PBZTs）作为刚性棒B嵌段单元，以提供目标ABA三嵌段共聚物。所得三嵌段共聚物不溶于常见的极性非质子溶剂，例如N-甲基吡咯烷酮，二甲基甲酰胺，二甲基乙酰胺和二甲基亚砜，但在强酸如三氟乙酸，甲磺酸（MSA），三氟甲磺酸和硫酸中的溶解度大大提高。可以从解决方案中投射高质量的电影。或者，我们也可以通过压缩成型技术加工这些共聚物。只需将嵌段共聚物样品加热到线圈组件的转变温度以上，然后压制成所需形状的物品即可。所选溶液流延膜的广角X射线衍射研究显示出长程有序，这表明微相分离。小角度X射线衍射，扫描电子显微镜和透射电子显微镜的结果进一步证实了这一点。此外，共聚物溶液的紫外可见吸收行为表明​​，MSA中PBZT的基态构型很大程度上取决于PEK单元的非晶或半结晶性质，这对发射性能几乎没有影响。

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