Síntese e caracterização de poliuretanos bioestáveis com potencial aplicação na área cardiovascular

Abstract

The search for materials that can replace or restore damaged tissues is due to the search for better life quality of the population. Considering that cardiovascular diseases are the main causes of death in Brazil (Banco de Saúde, 2010), needs some devices that have efficacy in cardiac regeneration, addressing about issues of long-term safety and promoting the healing of vascular vessels (PR Newswire, 2010). In this sense, this paper developed the synthesis of biostable polyurethanes from the reaction of polycaprolactone diol (PCL) with different diisocyanates (HDI and H12MDI), characterizing them by morphological analysis (MEV), thermal (TGA and DSC), mechanical (DMA) and structural (IV), but also evaluating their in vitro cytotoxicity, by testing for the evaluation of cell viability (MTT and VN test) and cell proliferation (Trypan Blue test) using NIH-3T3 fibroblast cells, comparing them with commercial materials, Dacron and PTFE. The obtained results showed that the synthesized polyurethanes had average molar weight (Mw) ranging between 30000 and 263000 g/mol, as well as a plasticity depended of polyol used. The mechanical behavior of polyurethanes showed similar or greater than the commercial material, Dacron and PTFE. The biostability tests showed that there was mass loss below 20% of the materials exposed to hydrolytic degradation in the period of 270 days and below 5% in the enzymatic degradation in the period of 30 days. The cell viability of polyurethanes was superior to 80%, considered non-cytotoxic. Polyurethanes in this study showed favorable results for its possible use as biomaterial in cardiac applications