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Journal of Industrial and Environmental Chemistry
|
Volume 2
GREEN CHEMISTRY &
TECHNOLOGY
7
th
International Conference on
J u n e 1 8 - 2 0 , 2 0 1 8 | D u b l i n , I r e l a n d
Satyannarayana Panchireddy et al., J Ind Environ Chem 2018, Volume 2 | DOI: 10.4066/2591-7331-C1-003
SUSTAINABLE
POLY(HYDROXYURETHANE)
S THERMOSET ADHESIVES FOR
AFFIXING METALS
Satyannarayana Panchireddy, Bruno Grignard, Jean-Michel
Thomassin, Christine Jerome
and
Christophe Detrembleur
University of Liège, Belgium
I
n the last five years, isocyanates-free polyhydroxyurethanes (PHUs),
synthesized by step-growth polymerization between bis-cyclic
carbonates and di- or poly-amines, have emerged as a novel class of
polyurethanes (PUs). These PHUs find promising applications in flooring,
paints, as thermoset materials or (thermal insulation) foams. PHUs can
be also exploited advantageously for designing the next generation of
high performance polyurethane adhesives. Thanks to the presence of
pendant hydroxyl groups favoring the polymer/substrate interactions, the
adhesion performances of PHUs may equal or even surpass the ones of
conventional PUs. In this contribution, we focused on the design of novel
reinforced bio- and CO
2
-based PHU thermosets adhesives with high shear
adhesion strength for metal substrates (aluminum and stainless steel).
The research included: The synthesis of a library of bi- or multifunctional
5-membered cyclic carbonates by coupling CO
2
with (bio-based)
epoxidized precursors using a novel home-made binary organocatalyst
highly performant under very mild experimental conditions. The
development of solvent-free reinforced PHU thermoset adhesives from
various cyclic carbonate/amine/functional fillers formulations. For all
formulations, curing kinetics was monitored by rheology to determine
the gelation time and the thermo-mechanical and physico-chemical
properties of PHUs were evaluated on free-standing films. The evaluation
of the adhesives performances for metal sticking: The adhesion of
(reinforced) PHUs onto Al-2024-T3 or stainless steel substrates was
evaluated by standard cross-cut adhesion (5B) and MEK double rubber
(>300) tests and shear adhesion strength (>16 MPa).
Satyannarayana Panchireddy received his MSc
degree from University of Hyderabad, India, in
2012. He works as a Research Assistant (DR-
DO-Junior Research Fellow) on Synthesis of
Norbornene Derived Polymers at Indian Insti-
tute of Science Education and Research-Kol-
kata (IISER-K), India, in 2012-13. He moved to
KU Leuven, Belgium, in 2014-15, to work as Re-
search Associate on Polyelectrolyte Thin Film
Membranes. He is currently a PhD Researcher
under supervision of Professor Christine Je-
rome, and Dr. Christophe Detrembleur at Labo-
ratory of Center for Education and Research on
Macromolecules (CERM), University of Liège,
Belgium. His current research focused on the
synthesis and development of novel sustain-
able non-isocyanate polyurethanes for innova-
tive applications as coatings and adhesives for
automotive, aerospace, electronics, footwear,
pharmaceuticals etc.
satyasjgc31@gmail.comBIOGRAPHY