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Polymer Chemistry 2018
Polymer Sciences
ISSN: 2471-9935
Page 80
March 26-28, 2018
Vienna, Austria
3
rd
Edition of International Conference and Exhibition on
Polymer Chemistry
T
he most common way to synthetize polyimides involves the
polycondensation of diamine and dianhydride monomers
in solution. The reaction is in general achieved in two steps;
first, an intermediate poly(amic acid) is formed, which is
further cyclized into polyimide upon appropriate heating. In
this solution polymerization process, high boiling temperature
solvents are mainly used, such as N-methyl-2-pyrolidone. As
such solvents are hazardous chemicals, there is a real interest
to develop an approach preventing their use. To this end, some
research works have been recently reported concerning the
imidization into an extruder of a poly(amic acid) solution in
dichlorobenzene. The drawbacks of this process remain in the
solvent elimination and the total reaction time (several hours).
In the frame of our project, we developed amethod for obtaining
polyimides directly in solvent-free conditions via a reactive
extrusion process, within typical extrusion residence times (5–
10 minutes). Trial runs have been performed on 15 mL micro-
compounder. The optimization of the shear conditions and of
the reaction temperature allowed obtaining polyimides within
a reaction time ranging from 3–5 minutes. The scaling up of
this process has been carried out using a twin screw extruder
(L/D = 60). The polyimides obtained were characterized by
both
1
H and
13
C NMR. The molar masses of the polyimides
were obtained by size-exclusion chromatography. FT-IR
spectroscopy has been used to confirm the imide structure and
the imidization conversion rate has been determined by DSC.
Recent Publications:
1. Sroog, C.E.
et al.
(1965) Aromatic polypyromellitimides
from aromatic polyamic acids.
J. Polym. Sci. A Gen. Pap.
(3): 1373.
2. Silvi, N.
et al.
(2003) Method for preparing polyimide and
polyimide prepared thereby.
US patent no.7053168
3. Yu, H-C.
et al.
(2016) Kinetic Study of Low-Temperature
Imidization of Poly(amic acid)s and Preparation of
Colorless, Transparent Polyimide Films.
J. Polym. Sci.
Part A: Polym. Chem.
54 (11):1593
4. Schab-Balcerzak, E.
et al.
(2010) Influence of azobenzene
units on imidization kinetic of novel poly(ester amic
acid)s and polymers properties before and after
cyclodehydration.
J. Appl. Polym. Sci.
118 (5):2624
5. Liaw, D-J.
et al.
(2012) Advanced polyimide materials.
Progress in Polymer Science
37 (7):907.
Biography
Laurent Verny is a PhD student in the Polymer Materials Engineering Labo-
ratory (IMP) in the Université de Lyon (France). The unit has been divided in
to four areas of excellence: Chemistry of Polymers, Structure and Rheology
of Polymers: Process and Simulation, Physical Properties and Functional
Materials, and Polymers at the Interface of Life Sciences. The IMP laborato-
ry has wide fields of application such as polymers for energy, polymers for
the car and aeronautical industries and polymers for medical applications.
His research interests include reactive extrusion, polyimide and solvent free
synthesis.
laurent.verny@univ-lyon1.frPolyimide synthesis via reactive extrusion
Laurent Verny, Régis Mercier, Eliane Espuche, Guillaume Sudre
and
Véronique
Bounor-Legaré
Université de Lyon, France
Laurent Verny et al., Polym Sci, Volume 4
DOI: 10.4172/2471-9935-C1-008