摘要
聚芳醚酮在硫酸溶液中产生极化的主要因素包括质子化作用，硫酸的各种作用表明：聚合物分子结构中酮基含量或分子链刚性度增加时，硫酸的极化作用也增加，表现为UV谱红移，最大吸收峰显著增强及测得粘度与实际植偏差增大．由此，首次提出粘度法测定分子量时应考虑分子刚性等的影响．而用19FNMR法对合成的大量聚芳醚酮化合物分子量的定量研究表明，此法可由测得的端基氟含量，进而得到高聚物的数均分子量，无需校正．
Protonation is one of the major factors for poly(aryl ether ketone)s (PAEDs) molecules polarizedin H2SO4. Results from UV and calculation show that degree of polarization of PAEKs by H2SO4increases with the ketone content or molecular chain regidity in polymer chains. This has been furtherproved by the experimental results, such as, larger λmax (UV), more intense absorption at λmax andgreater deviatiou between experimental and practical viscosity values in concentrated H2SO4 than inother solvents. Based on these, we firstly suggested that the molecular rigidity is an important factor tobe considered in measuring the PAEK. molecularweights. While, 19F NMR is adopted to quantitativelymeasure the molecular weight of many synthesized oligomers aud polymers, which gives a number -average molecular weights without any correction.
出处
《波谱学杂志》
CAS
CSCD
北大核心
1997年第2期153-160,共8页
Chinese Journal of Magnetic Resonance
基金
国家"863"重大项目
中科院化学所高分子物理联合开放实验室资助
关键词
聚芳醚酮
质子化
分子链刚性
分子结构
NMR
Poly(aryl ether ketone)s, Protonation, Molecular weight, Structure and Rigidity
