Structure identification of residual group of the initiator of GAP with low polymerization degree and its residual chlorine analysis

To determine the residual chlorine content in the industrial grade glycidyl azide polymer (GAP) with unknown part structure, the GAP without chlorine(GAP-P) was prepared by sufficient azido reaction of industrial GAP with low polymerization degree(GAP-R). The fine structural analyses of GAP-R and GAP-P were performed by electrospray ionization-quadrupole-time of flight mass spectra (ESI-Q-TOF-MS), quantitative ¹³C nuclear magnetic resonance spectra (quantitative ¹³C NMR) and Fourier transform infrared spectra (FT-IR). The analytical methods of the residual group of the initiator, the residual chlorine content, chlorine atom position, the average polymerization degree and the number average molecular weight of GAP-R were determined. The results show that the residual groups of the initiators of GAP-R are the propylidene groups, and the residual chlorine atoms are on the internal structural units, the chlorine content is 3.39%, the average degree of polymerization is 3.70 and the number average molecular weight is 439.57g/mol.