摘要
研究了正丁基锂(n-BuLi)及聚丁二烯基锂(PBLi)在环已烷溶剂中的紫外光谱,以及极性添加剂1,2-甲氧基乙烷(DME)的加入对其紫外光谱的影响。结果表明:当DME加至n-BuLi环已烷溶液中时,在λ_(max)=310(?)处出现新的吸收峰,且随DME用量增加,峰强度增大;当DME加至PBLi的环已烷溶液中时,则发现吸收峰发生位移,由原来λ(?)=260nm左右移至λ(?)=280nm左右。此外,还发现吸收峰波长与活性种浓度和单体浓度有关。
The UV spectra of n-BuLi and polybutadienyllithium (PBLi) in cyclohexane and the offects of dimethoxyetnane (DME) used as polar additive on them were studied in detail. The experimental results showed that when DME was added into the solution of n-BuLi in cyclohexane, a new absorption peak appeared at λ_(max)=310nm and its strength increased with increasing the amount of DME added; on the other hand, when DME was added into the solution of PBLi in cyclohexane, the absorption replacement would take place: theλ_(max) changed from about 260 nm to about 280 nm. Besides, it was also found that the wave length was related to the monomer concentration as well as to the concentration of active species.
关键词
丁二烯
阴离子聚合
聚丁二烯基锂
butadiene, anionic polymerization,UV-spectrometry, n-BuLi, polybutadienyllithium.
