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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Pressure-Induced Polymerization of Acrylic Acid: A Raman Spectroscopic Study
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Pressure-Induced Polymerization of Acrylic Acid: A Raman Spectroscopic Study

机译：压力诱导的丙烯酸聚合：拉曼光谱研究

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摘要

We report here the first in-situ Raman spectroscopic study of pressure-induced structural and polymeric transformations of acrylic acid. Two crystalline phases (I and II) were observed upon compression to ~0.3 and ~2.7 GPa. Phase I can be characterized with a single s-cis molecular conformation with possibly a similar structure to the low-temperature phase, while phase n suggests significantly enhanced molecular interactions toward polymerization and structural disordering. Beyond ~8 GPa, spectroscopic features indicate the onset of polymerization. The high-pressure polymeric phase together with the pressure-quenched materials was examined and compared with two commercial acrylic acid polymers using Raman spectroscopy. The characteristics of polymeric acrylic acid and their transformation mechanisms as well as the implications of hydrogen-bonding interactions are discussed.
机译：我们在这里报告了压力引起的丙烯酸的结构和聚合物转变的第一个原位拉曼光谱研究。压缩至〜0.3 GPa和〜2.7 GPa时观察到两个结晶相（I和II）。 I相的特征可能是单个s-顺式分子构象，其结构可能与低温相相似，而n相则表明分子对聚合和结构紊乱的相互作用大大增强。超过〜8 GPa，光谱特征表明聚合反应开始。检查了高压聚合物相和压力淬灭的材料，并使用拉曼光谱法将其与两种商用丙烯酸聚合物进行了比较。讨论了聚合丙烯酸的特性及其转化机理以及氢键相互作用的含义。

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