Composite of waterborne polyurethane reinforced with microfibrillated

MARÍA. E. V. HORMAIZTEGUI; VERONICA MUCCI; MARIAN CORCUERA; ARANTXA ECEIZA; M. I. ARANGUREN

Buenos Aires

Conferencia; 6th International Conference on Science and Technology of Composite Materials, COMAT 2015.; 2015

ITPN, INTECIN, INIFTA, INTEMA, ECNP, INTI, Facultad de Ingeniería

Polyurethane is a most versatile polymer material that can be synthesized from many commercially available and relatively cheap polyols, isocyanates and chain extenders. Waterborne polyurethane (WBPU) dispersions can offer the following advantages: no need for external emulsifiers, flexibility, high strength, non flammability, environmental safety and good adhesion characteristics. However, WBPUs present drawbacks such as poor surface properties, and limited thermal, mechanical and electrolytic stability caused principally by low crosslinking density. The incorporation of nanocellulose that shows very good compatibility with WBPUs is proposed to improve the mechanical properties of these materials. In this work, two waterborne polyurethanes, WBPU1 and WBPU2, based on polycaprolactone diol and a bio-based diol, respectively, were used in the formulation of composites with different content of microfibrillated nanocellulose. The process parameters were selected depending on the diol, and films were prepared by casting. The materials were characterized by FTIR, tensile test, SEM, DRX, DSC and DMA.