The Role of Molecular Interactions in Controlling Methanol Diffusion in Polyimides: A  Time‐Resolved  FTIR Spectroscopy Investigation | Zendy

Musto Pellegrino | Zendy; La Manna Pietro | Zendy; Pannico Marianna | Zendy

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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.

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