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首页> 外文期刊>Journal of Applied Polymer Science >SYNTHESIS AND PROPERTIES OF POLY(ETHER ETHER KETONE KETONE)-POLY(ETHER SULFONE) BLOCK COPOLYMERS
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SYNTHESIS AND PROPERTIES OF POLY(ETHER ETHER KETONE KETONE)-POLY(ETHER SULFONE) BLOCK COPOLYMERS

机译：聚（醚酮酮）-聚（醚砜）嵌段共聚物的合成及性能

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摘要

Poly(ether ether ketone ketone)-poly(ether sulfone) (PEEKK/PES) block copolymers were prepared from the corresponding oligomers via a nucleophilic aromatic substitution reaction, and the <(M)over bar(n)> of the PEEKK segment was fixed at 12,000, while the <(M)over bar(n)>'s of the PES segment ranged from 250 to 12,680. The different properties of the copolymers were investigated by differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), ther mogravimetric analysis (TGA), and dynamic mechanical analysis (DMA). The results showed that the relationship between T-g and compositions of copolymers approximately followed the formula 1/T-g = W-1/T-g1 + W-2/T-g2. The PES content and the segment length of the copolymers had a significant influence on their melting points and crystallization behavior. The thermal properties and dynamic mechanical behavior of the copolymers were also studied. In the study of isothermal crystallization, the copolymers have the same nucleation mechanism and crystal growth as that of pure PEEKK. Owing to the introduction of the PES segment into the PEEKK main chain, it increases the free energy which forms the critical crystal nucleus and produces a resistant action to the whole crystallization process of the PEEKK segment. (C) 1996 John Wiley & Sons,Inc. [References: 19]
机译：通过亲核芳族取代反应由相应的低聚物制备聚醚醚酮酮-聚醚砜嵌段共聚物（PEEKK / PES），PEEKK链段的<（M）over bar（n）>为固定为12,000，而PES段的<（M）over bar（n）>在250至12,680之间。通过差示扫描量热法（DSC），广角X射线衍射（WAXD），热重分析（TGA）和动态力学分析（DMA）研究了共聚物的不同性能。结果表明，T-g与共聚物组成之间的关系近似遵循公式1 / T-g ＝ W-1 / T-g1 + W-2 / T-g2。共聚物的PES含量和链段长度对其熔点和结晶行为有重大影响。还研究了共聚物的热性能和动态力学行为。在等温结晶研究中，共聚物具有与纯PEEKK相同的成核机理和晶体生长。由于将PES链段引入PEEKK主链，它增加了形成关键晶体核的自由能，并对PEEKK链段的整个结晶过程产生了抵抗作用。 （C）1996年John Wiley＆Sons，Inc。 [参考：19]

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