核磁共振波谱在高分子化学中的应用1.未知聚合物样品的剖析由未知样品的核磁共振波谱与标准谱相比较是很容易确定聚合物结构的。当聚合物中含有添加剂(如增塑剂、硫化剂、硫化促进剂等)时,可使用部分弛豫福里哀变换法(PRFT)将高分子和低分子峰分开(高分子峰向上,低分子峰向下)。聚合物中含有残留的单体和溶剂时,也可用此法分开。2.聚合物序列结构的测定聚合物中单体的连接方式(如头-头连接和头-尾连接等)不同,在核磁共振波谱中有明显的反映。一般碳氢聚合物,在~1H核磁共振谱中,不同序列结构的谱峰常有重叠,计算有一定困难,需用电子计算机模拟曲 Nuclear Magnetic Resonance Spectroscopy in Polymer Chemistry 1. Analysis of unknown polymer samples The NMR spectra of unknown samples compared with the standard spectra are very easy to determine the polymer structure. When the polymer contains additives (such as plasticizers, vulcanizing agents, vulcanization accelerators, etc.), the partial relaxation of Forresse’s transformation (PRFT) can be used to separate high and low molecular peaks (high molecular weight peaks and low molecular weight Peak down). Polymers contain residual monomers and solvents can also be separated by this method. 2. Determination of the polymer sequence structure Monomer in the polymer connections (such as head-head connection and head-tail connections, etc.), in the nuclear magnetic resonance spectroscopy are clearly reflected. General hydrocarbon polymer, ~ 1H nuclear magnetic resonance spectrum, the different sequence structure of the peaks often overlap, there are some difficulties in the calculation, the need to use computer simulations