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Derivative ultraviolet and visible spectrophotometry: Applications to polymer analysis
Author(s) -
Mori Sadao
Publication year - 1987
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1987.070330605
Subject(s) - polystyrene , spectrophotometry , derivative (finance) , absorption (acoustics) , chemistry , absorption spectroscopy , phenol , polymer , humic acid , spectral line , analytical chemistry (journal) , polymer chemistry , organic chemistry , materials science , chromatography , fertilizer , physics , quantum mechanics , financial economics , economics , composite material , astronomy
First‐ to fourth‐derivative spectra of humic acids, polystyrene, and mixtures of several prepolymers were measured and the advantage of derivative spectrophotometry such as resolution enhancement and background correction was discussed. Although the vis‐absorption spectra for humic acids in pH solutions from pH 2.0 to 10.0 could be hardly discriminated, humic acids in solutions above pH 7.0 could be clearly distinguished from those in solutions below pH 6.0 by first‐derivative spectrophotometry. Similarly, the first‐derivative spectra of the copper‐humic acid complex were different from those of free humic acids, though both absorption spectra resembled each other. UV absorption spectrum of a mixture of phenol‐novolac resin and methylated methylol‐melamine resin was similar to and the second‐derivative spectrum was different from that of phenol‐novolac resin. The difference of derivative spectra of a mixture of polycarbonate and epoxy resin was also discussed. Shoulder and unresolved peaks were clearly revealed by differentiation of absorption spectra and peak assignments from the fourth‐derivative spectra were more accurate than those from the absorption spectra. This advantage was discussed by using polystyrene as an example.