STRUCTURE DETERMINATION OF POLYMERIC MATERIALS BY PYROLYSIS GAS CHROMATOGRAPHY

摘要

A pyrolysis gas chromatography method has been developed to investigate the microstructure of emulsion polymers, The number-average sequence length, which reflects the monomer arrangement in the polymer, was calculated using the proper formulas that incorporate the pure trimer peak intensities and hybrid trimer peak intensities. In this study, styrene and n-butyl acrylate copolymer systems were used to measure ''the degree of structure'' (i.e., the number-average sequence length for styrene and n-butyl acrylate repeat units) and compared to a homogeneous nonstructured (or random) copolymer, The number-average sequence length information was further extended to calculate the composition, For the emulsion polymers examined in this study, the composition elucidated from the number-average sequence length matched the preparation recipe and/or what was measured by C-13 NMR.