Premium
Two‐dimensional near‐infrared correlation spectroscopy studies of polymer blends I: Composition‐dependent spectral variations of blends of atactic polystyrene and poly[2,6‐dimethyl‐1,4‐phenylene ether]
Author(s) -
Ren Yanzhi,
Ozaki Yukihiro,
Murakami Tsuyoshi,
Nishioka Toshikatsu,
Nakashima Kenichi
Publication year - 1999
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19991410116
Subject(s) - polystyrene , polymer blend , materials science , phenylene , ether , polymer , infrared spectroscopy , infrared , spectroscopy , polymer chemistry , analytical chemistry (journal) , chemistry , composite material , organic chemistry , copolymer , optics , physics , quantum mechanics
Generalized two‐dimensional (2D) near‐infrared (NIR) correlation spectroscopy has been applied to study the conformational changes and molecular interactions in blends of atactic polystyrene (PS) and poly[2,6‐dimethyl‐1,4‐phenylene ether] (PPE). NIR diffuse reflectance spectra have been measured for PS, PPE and their blends of different compositions, i.e., PS/PPE=90/10, 70/30, 50/50, 30/70, 10/90. The 2D synchronous correlation analysis of these composition‐dependent NIR spectral variations separates the bands of PS from those of PPE. The 2D asynchronous analysis identifies spectral features indicative of the conformational changes or the specific interaction of PS and PPE. It can also detect “blend bands” whose origin is attributed to the formation of the polymer blends. Two “blend bands” of PS are identified at 6887 and 4836 cm −1 , and three “blend bands” of PPE are observed at 5752, 5679 and 4647 cm −1 . These “blend bands” are due to vibrations of the aromatic rings of PS or PPE and of the CH 3 of PPE. Thus, not only the aromatic rings of PS and PPE but also the CH3 groups of PPE play important roles in the formation of the blends.