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首页> 外文期刊>Applied Spectroscopy: Society for Applied Spectroscopy >Characterizing the Structure and Phase Transformation of Poly(ethylene Oxide)-Urea Complexes Using Terahertz Time-Domain Spectroscopy
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Characterizing the Structure and Phase Transformation of Poly(ethylene Oxide)-Urea Complexes Using Terahertz Time-Domain Spectroscopy

机译:用太赫兹时域光谱表征聚(环氧乙烷) - 脲复合物的结构和相变性

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摘要

Terahertz time-domain spectroscopy (THz-TDS) was employed to characterize the structure and phase transformation of poly(ethylene oxide) (PEO)-urea complexes. While the THz responses of - and -form complexes are both originated from hydrogen bonding interactions, they possess different THz absorption bands. The -form PEO-urea complex shows two bands at 1.12 and 1.24THz, which are vibration modes due to the hydrogen bonding among urea and between PEO and urea, respectively; the -form PEO-urea complex shows a band at 1.48THz, which is a vibration mode due to the hydrogen bonding among urea. A polarized THz-TDS study demonstrates that the urea-urea hydrogen bonding direction rotates 90 degrees during the transformation process. This study reveals the great potential of THz-TDS for investigating polymer-small molecule complexes.
机译:使用Terahertz时域光谱(THz-TDS)来表征聚(环氧乙烷)(PEO) - 脲复合物的结构和相变。 虽然 - 和-Form复合物的THz响应源自氢键相互作用,但它们具有不同的THz吸收带。 --Form Peo-urea复合物在1.12和1.24Thz下显示两个带,这是由于尿素之间的氢键和PEO和尿素之间的振动模式; --Form PEO-UREA复合物在1.48 ZHz下表示带有uREA之间的氢键的振动模式。 偏振的THz-TDS研究表明,在变换过程中尿素尿素氢键方向旋转90度。 本研究揭示了THz-TDS用于研究聚合物 - 小分子复合物的巨大潜力。

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