摘要
为弄清聚芳醚酮单体在硫酸中变色（红）现象，通过１３ＣＮＭＲ研究了它们在ＣＤＣｌ３、ＣＤＣｌ３＋ＤＭＳＯ－ｄ６和Ｈ２ＳＯ４的１３Ｃ谱化学位移及氟端基偶合情况．研究表明：这些单体溶于硫酸时，羰基碳弛豫时间缩短化学位移增加，而与羰基相连的季碳弛豫时间减小化学位移也减少．据此，首次提出硫酸使这些单体极化的机理为正极性磺酸基使羰基发生电子离城，变温１３Ｃ谱对此进行了验证．
To clarify the reason for the red solution of poly(aryl ether ketone), monomers in H2SO4, this paper had studied their chemical shifts and florine-ended dipolarity in solvents of CDCl3, CDCl3+DMSO-d6 and H2SO4, results showed that, when the monomers in H2SO4, their carbonyl carbon relaxation time was shortened and their chemical shifts increased, While the chemical shift of the quarternary carbon attached to carbonyl group was reduced and relaxation time shortened. Based on the above, the polarization mechanism of H2SO4 on these monomers is presented for the first time,that is, the sulfo group made electrons in carbonyl group delocalized, which was further proved by 13C NMR under variation temperature.
出处
《波谱学杂志》
CAS
CSCD
1996年第2期137-144,共8页
Chinese Journal of Magnetic Resonance
基金
国家"863"重大项目课题
关键词
聚芳醚酮单体
NMR
极化
驰豫
Monomers of poly(aryl ether ketone)_s, ￣(13)C NMR, Polarization, Relaxation
