POLYMER BLENDS AND NANOCOMPOSITES

Research Group Leader : Dr Leila Bonnaud

Phone :+32(0)65.55.49.75

Secretariat : +32(0)65.37.34.83

Research activities conducted in this unit are focused on the development of sustainable strategies (solvent free for instance) to structure polymeric materials (including polymers filled with particles –micro or nano- and blends of polymers…) and the understanding of the relations structure-properties, processing and performance in order to manufacture advanced materials.

Main research areas involved:
-material synthesis and formulation including dispersion, confinement of particles within polymers, plasticization, grafting, functionalization of polymers, compatibilization of polymer blends, reactive blending
-material processing including bulk, films and fibres (link to Biobased Polymers unit)
-material morphology (see MATERIA NOVA and CIRMAP)
-fire behaviour of polymeric materials
-material properties (mechanical, electrical, thermal properties, permeability to gas)
-material durability (aging –thermal, UV, specific conditions-, biodegradation) (see MATERIA NOVA)
Other activities:
-material manufacture (pellets) (see NANO4)

Top selected papers

Chavicol benzoxazine: Ultrahigh Tg biobased thermoset with tunable extended network

LudovicDumas, LeïlaBonnaud, MarjorieOlivier, MarcPoorteman, PhilippeDubois Abstract A novel biobased benzoxazine monomer containing additional allyl functionality was synthesized using a solventless approach from the reaction of a natural occuring phenol: chavicol, para-phenylene diamine and formaldehyde. The chemical structure of this functionalized benzoxazine monomer was confirmed by 1H NMR and FTIR. Its polymerization was investigated and monitored by DSC showing two well defined exotherms allowing the selective ring-opening polymerization of benzoxazine functions and the preservation of the allyl functionality. The network crosslink density could be further increased via the controlled polymerization of allyl functionalities with a post-cure in order to adjust the thermo-mechanical properties. When both networks were polymerized, the
Read More
Chavicol benzoxazine: Ultrahigh Tg biobased thermoset with tunable extended network

Arbutin-based benzoxazine: en route to an intrinsic water soluble biobased resin

Ludovic Dumas,  Leïla Bonnaud,  Marjorie Olivier,  Marc Poorteman  and  Philippe Dubois  Abstract A novel benzoxazine monomer containing a carbohydrate moiety was synthesized using a solventless approach from the reaction of arbutin, a naturally occurring phenolic compound, furfurylamine and formaldehyde. The chemical structure of this fully bio-based benzoxazine monomer was confirmed by 1H NMR and FTIR. Its polymerization has been investigated and monitored by DSC showing the ring opening polymerization of benzoxazine functions with a network densification thanks to the reaction of the furan group. The high hydroxyl content of the monomer allows its easy solubilisation in water paving the way to a wide range of possible “environmentally
Read More
Arbutin-based benzoxazine: en route to an intrinsic water soluble biobased resin

L. Poussard, J. Mariage, B. Grignard, C. Detrembleu, C. Jérôme, C. Calberg, B. Heinrichs, J. De Winter, P. Gerbaux, J.-M. Raquez, L. Bonnaud, and Ph. Dubois   Abstract Fully bio- and CO2-sourced non-isocyanate polyurethanes (NIPUs) were synthesized by reaction of carbonated soybean oil (CSBO) either with biobased short diamines or amino-telechelic oligoamides derived from fatty acids to achieve respectively thermoset or thermoplastic NIPUs. Biobased carbonated vegetable oils were first obtained by metal-free coupling reactions of CO2with epoxidized soybean oils under supercritical conditions (120 °C, 100 bar) before complete characterization by FTIR, 1H NMR, and electrospray ionization mass spectroscopy (ESI-MS). In a second step, biobased NIPUs were produced by melt-blending of the so-produced cyclocarbonated oil with
Read More

CO2-blown microcellular non-isocyanate polyurethane (NIPU) foams: from bio- and CO2-sourced monomers to potentially thermal insulating materials

B. Grignard,  J.-M. Thomassin,  S. Gennen,  L. Poussard,  L. Bonnaud,  J.-M. Raquez,  P. Dubois,  M.-P. Tran,  C. B. Park,  C. Jerome  and  C. Detrembleur Abstract Bio- and CO2-sourced non-isocyanate polyurethane (NIPU) microcellular foams were prepared using supercritical carbon dioxide (scCO2) foaming technology. These low-density foams offer low thermal conductivity and have an impressive potential for use in insulating materials. They constitute attractive alternatives to conventional polyurethane foams. We investigated CO2's ability to synthesize the cyclic carbonates that are used in the preparation of NIPU by melt step-growth polymerization with a bio-sourced amino-telechelic oligoamide and for NIPU foaming. Our study shows that CO2 is not only sequestered in the material for long-term application, but
Read More
CO2-blown microcellular non-isocyanate polyurethane (NIPU) foams: from bio- and CO2-sourced monomers to potentially thermal insulating materials

Convenient and solventless preparation of pure carbon nanotube/polybenzoxazine nanocomposites with low percolation threshold and improved thermal and fire properties

Camilo Zúñiga,  Leïla Bonnaud,  Gerard Lligadas,  Juan Carlos Ronda,  Marina Galià,  Virginia Cádiz  and  Philippe Dubois   Abstract This work contemplates the use of pristine multiwalled carbon nanotubes (MWNTs) as nanofillers in the preparation of bisphenol A-based polybenzoxazine and diphenolic acid derived polybenzoxazine. These materials were prepared by using a solventless method varying the MWNT amount from 0.1 to 1.0 wt%. MWNTs were found to disperse well within both benzoxazine monomers and the dispersion also appears to be good in the cured system. Rheological and electrical percolation thresholds were obtained for MWNT concentrations lower than 0.1 wt% indicating the existence of good affinity between MWNTs and polybenzoxazine matrices. The
Read More
Convenient and solventless preparation of pure carbon nanotube/polybenzoxazine nanocomposites with low percolation threshold and improved thermal and fire properties