Determination of total short‐chain branching in polyethylenes by computerized data processing of infrared spectra

摘要

AbstractA computer method is described to determine the short‐chain branching of polyethylene from IR spectroscopic data. The shape of the band at 1378 cm−1(characteristic to the methyl side groups) was calculated by using first a deconvolution procedure (Ishige method) for the envelope curve of the overlapping peaks in the region of 1300‐1400 cm−1, followed by a convolution calculus applied only to the deconvoluted points of the peak in question. The results were in good agreement with values determined by Willbourn's compensation