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A rapid technique for measuring copolymer composition as a function of molecular weight using gel permeation chromatography and infrared detection |
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| Authors: | Francis M. Mirabella Edward M. Barrall Julian F. Johnson |
| Abstract: | A gel permeation chromatograph using an infrared spectrometer detector is described. Operation in a stop-and-go fashion permits rapid determination of copolymer composition as a function of molecular weight. A broad distribution copolymer, poly(vinyl chloride–co–vinyl stearate), showed marked compositional changes with molecular weight. The changes observed are not in agreement with those predicted from reactivity ratios. |
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