Stability of biodegradable waterborne polyurethane films in buffered saline solutions

摘要: The stability of polyurethane (PU) is critical importance for applications such as in coating industry or biomaterials. To eliminate the environmental concerns on synthesis PU which involves use organic solvents, aqueous-based waterborne (WBPU) has been developed. WBPU, however, may be unstable an electrolyte-rich environment. In this study, authors reported biodegradable WBPU buffered saline solutions evaluated by atomic force microscopy (AFM). Various films were prepared spin coverslip glass, with a thickness ∼300 nm. surface AFM images poly(e-caprolactone) (PCL) diol-based revealed nanoglobular structure. same feature was observed when 20% molar PCL diol soft segment replaced polyethylene butylenes adipate diol. After hydration 24 h, domains generally increased sizes and became irregular shape. On other hand, poly(l-lactide) diol, meshlike structure demonstrated AFM. When latter hydrated, appeared to disconnected. Results from attenuated total reflectance infrared spectroscopy x-ray photoelectron indicated that chemistry altered after hydration. These changes probably associated neutralization carboxylate ions solutions, resulting rearrangements hard segments causing instability WBPU.