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The Role of Molecular Interactions in Controlling Methanol Diffusion in Polyimides: A Time‐Resolved FTIR Spectroscopy Investigation
Author(s) -
Musto Pellegrino,
La Manna Pietro,
Pannico Marianna
Publication year - 2016
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.201500004
Subject(s) - fourier transform infrared spectroscopy , penetrant (biochemical) , thermal diffusivity , polymer , materials science , spectroscopy , methanol , diffusion , analytical chemistry (journal) , polymer chemistry , gravimetric analysis , chemical engineering , chemistry , organic chemistry , thermodynamics , composite material , physics , quantum mechanics , engineering
Summary Polyimides are a well‐known class of high‐performance polymers with excellent properties and a wide range of applications, especially as membranes for gas and liquid separation. In this contribution a molecular level description of the methanol diffusion in three different polyimides is reported. Two commercial polyimides (PMDA‐ODA and Ultem 1000) and a third one synthetized ad‐hoc (6FDA‐ODA) were examined in detail by time‐resolved FTIR spectroscopy supplemented with gravimetric analysis. Complementary approaches were employed for the interpretation of the spectral data [difference spectroscopy (DS) and least‐squares curve fitting (LSCF)]. Information about the overall diffusivity, the interactions and the dynamics of the molecular species in the polymer/penetrant systems were provided.