天然橡胶分子链侧链结构的表征

Structural Characterization of Natural Rubber Molecular Side Chain

使用氮标记法以及凝胶渗透色谱仪、凯氏定氮仪、傅里叶红外光谱仪、核磁共振波谱仪等手段,分析和表征了天然橡胶分子链侧链中环氧基、醛基、羧基、羟基和分子链中的3,4-聚合结构。结果表明:在天然橡胶分子链侧链中,环氧基含量为0.63%,羟基含量为0.04%,醛基含量为0.11%,羧基含量为0.01%。根据上述结果,构建了天然橡胶分子链侧的链结构模型。

The branch Side-chains of the natural rubber molecular chain are investigated in this the- sis. The instruments such as by means of Gel Permeation Chromatograph （GPC）, Kjeldahl Auto Analyz- er, Fourier Transform Infrared Spectrometer（FTIR） and Nuclear Magnetic Resonance（NMR） Spectrome- ter etc. in terms of the epoxide group, hydroxyl, aldehyde group, and carboxyl group, as well as the 3,4- polymeric structures of the chain are used to detect the variety and content of branch. The experimental results show that the contents of epoxide group is 0.63%, hydroxyl is 0.04%, aldehyde groups is 0.11%, carboxyl groups is 0.01%. Based on these results, a model of molecular chain has been built is estab- lished for the natural rubbe.