MEASUREMENT OF NUMBER AVERAGE MOLECULAR WEIGHT OF STYRENE OLIGOMER BY 13C-NMR METHOD

• 来源期刊: 高分子科学（英文版）
• 年，卷（期）: 1999,（2）
• 页码范围: 135-140
• 页数: 6页
• 语种: 英文

摘要

13C-NMR 1H-decoupled spectra of styrene polymers were assigned by comparison with model compounds, then used in measurements of number average molecular weights. The higher limit of an exact determination of the end group signal is less than a molecular weight of 104. For polymer samples with Mn＜103, the results obtained from 13C-NMR spectra of saturated carbon region are in excellent agreement with the values determined by 1H-NMR, SEC, and VPO methods, while the results from 13C-NMR spectra of phenyl C-1 carbon region are somewhat higher than the values determined by other methods.