Abstract
Quantitative evaluation of hydrogen bonding of poly(4-vinyl phenol)/poly(ethylene oxide) PVPh/PEO blends was conducted using Fourier transform near infrared (FT-NIR) spectroscopy. Absorption coefficients of the free (aF), intra- (PVPh–PVPh) (aA) and inter-associated (PVPh–PEO) hydroxyl groups (aI) were estimated. Two sets of approximations were tested, including adopting a least-squares refinement method to calculate absorption coefficients from all NIR spectra or using a literature value for aF. Each set of absorption coefficients thus estimated were used to determine hydroxyl concentration for the free and hydrogen-bonded hydroxyl overtone bands in the blends. A comparison is made among the resultant concentrations of the free, intra- and inter-associated hydroxyl groups. The concentration of free hydroxyl groups markedly decreases with PEO percentage, and that of intra-associated hydroxyl remains almost constant. Concentration for the inter-associated hydroxyl groups in the blends increases very slowly above 0.2 PEO weight fraction. When concentration of OH groups is reported per PVPh chain, FT-NIR measurements show a broad maximum in the number of interchain hydrogen bonds. This result can be used to explain partially previous orientation behaviour observed for PVPh/PEO blends.
© 2003 NIR Publications
PDF Article
More Like This
Quantitative hydrogen analysis of zircaloy-4 in laser-induced breakdown spectroscopy with ambient helium gas
Muliadi Ramli, Ken-ichi Fukumoto, Hideaki Niki, Syahrun Nur Abdulmadjid, Nasrullah Idris, Tadashi Maruyama, Kiichiro Kagawa, May On Tjia, Marincan Pardede, Koo Hendrik Kurniawan, Rinda Hedwig, Zener Sukra Lie, Tjung Jie Lie, and Davy Putra Kurniawan
Appl. Opt. 46(34) 8298-8304 (2007)
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription