嵌段共聚物傅里叶变换拉曼光谱

用傅里叶变换拉曼光谱(FT-Paman)研究了聚环氧乙烷-聚环氧丙烷-聚环氧乙烷(PEO-PPO-PEO)嵌段共聚物的无水样品,发现某些谱带对PEO0-PPO-PEO嵌段共聚物的结构和构象变化敏感,其中某些峰的相对强度的PPO/PEO比率和共聚物的构象有关,研究表明PluronicF68和F88具有一些反式构象的螺旋结构,PluronicP103(P123)是无规则结构,其它的嵌段共聚物处于二者之间.

Structure of Triblock Copolymers by Fourier Transform Raman Spectroscopy

Fourier transform Raman (FT Raman) spectra of poly(ethylene oxide) poly(propylene oxide) poly(ethyl oxide) (PEO PPO PEO) triblock copolymers as pure samples have examined. The qualitative feature in Raman spectra of these copolymer has been presented. The Raman spectra of PEO PPO PEO block copolymer are very sensitive to the structural and conformational changes. It shows that the relative intensities of several peaks in Raman spectra are dependent on the PPO/PEO ratios and the conformation of the copolymers. From Raman spectra, pluronic F88 and F68 assume helical structures. Other block copolymers exhibit that the disordered structure increases with increasing PPO/PEO ratio.