Synthesis and characterization of nano-PTFE/polyurethane composites

ANBINDER, P.S.; PERUZZO, P.J.; PARDINI, O.R.; AMALVY, J.I.

Lima

Simposio; SLAP´08 (XI Simposio Latinoamericano de Polímeros y IX Congreso Iberoamericano de Polímeros); 2008

Polyurethanes are materials which have the possibility of tailoring their transport properties by varying the polymer microstructure. These polymers are composed of alternating urethane and polyol segments formed in the reaction of organic isocyanates, high molecular weight polyols and low molecular weight chain extenders [1]. Polyurethane aqueous dispersions (PUDs) have received increased attentions because they are non-toxic, non-flammable and do not pollute the air. With regard to the surface property of coated films, hydrophilic segments of PUD adversely affect water and oil repellency due to the relatively high surface free energy of the segments [2]. The incorporation of nano-PTFE (nano-Teflon®) particles to the polymeric matrix, would give to the polyurethanic films special surface properties. In a previous work [3] we discussed the effect of this nano-PTFE dispersion on the contact angle and dielectric properties of polyurethanic films. Nevertheless other properties of the films could also be affected. In this way, films prepared from the polyurethanic dispersions with different content of nano-PTFE, were characterized by means of ATR-FTIR, SAXS, TEM, SEM, DSC and mechanical properties.