Abstracts Book - IMRC 2018

• SB1-P049
CHARACTERIZATION OF NOVEL POLYARAMIDES WITH
CO2 PLASTICIZATION RESISTANCE
Rita del Rosario Sulub Sulub 1 , Manuel Aguilar 1 , María Ortencia González Díaz 2
1 Centro de Investigación Científica de Yucatán, Unidad de Materiales, Mexico. 2 CONACyT,
Centro de Investigación Científica de Yucatán (CICY), Unidad de Materiales, Mexico.
Polyaramides have been investigated as a membrane material for gas
separation applications [1]. However, many of them are materials difficult to
process with limited solubility in common solvents as a consequence of their
high-level of intermolecular packing caused by highly directional hydrogen
bonds. It has been demonstrated that introducing bulky pendant groups and
voluminous lateral substituents into polyamides is a very efficient way to
improve the solubility while retaining their thermal properties and increase the
polymer fractional free volume (FFV) resulting in high gas permeability through
the membrane [2]. In the present work, a series of aromatic polyamides with
different bulky pendant groups has been efficiently prepared via a simple
esterification reaction of poly(hexafluoroisopropylidene
hydroxyisophthalamide) (PA) with acid chlorides under mild conditions. In this
approach, a wide variety of acid chlorides as bulky pendant groups can be
employed to tailor a variety of polymeric structures, otherwise not obtainable.
The synthesized polyamides exhibit good processability in most common
aprotic solvents and high mechanical and thermal stability (up to 408 °C and Tg
= 290-311 °C). Depending on the bulky pendant group, the synthesized
polyamides were highly permeable (13.2 to 31.4 times higher for CO2) y more
permselective (3.4 to 4.5 times higher for CO2/CH4) in comparison with the
precursor PA. Gas-induced plasticization over the pressure range up to 10.17
bar tested was not observed. Thus, the current approach will be useful in an
assessment of the structure-property relationship, incorporating more bulky
and rigid pendant groups, in order to improve their gas transport properties.
References:
J.K. Adewole, A.L. Ahmad, S. Ismail, C.P. Leo, Int. J. Greenh. Gas Control 17 (2013)
46-65.
M.O. González-Díaz, J.M. Pérez-Francisco, W. Herrera-Kao, A. González-Díaz, A.
Montes-Luna, M. Aguilar-Vega, Sep. Purif. Technol. 189 (2017) 366-374.