Fernandes, D. M.Hechenleitner, AAWJob, A. E.Radovanocic, E.Pineda, EAG2014-05-202014-05-202006-05-01Polymer Degradation and Stability. Oxford: Elsevier B.V., v. 91, n. 5, p. 1192-1201, 2006.0141-3910http://hdl.handle.net/11449/39669A kraft lignin derivative (KLD) obtained by reaction with p-aminobenzoic acid/phthalic anhydride was blended with poly(vinyl alcohol) (PVA) by solution casting from DMSO. PVA and PVA/KLD films were exposed to ultraviolet radiation (24, 48, and 96 h) and analyzed by thermogravimetry (TG), differential scanning calorimetry (DSC), infrared spectroscopy (FTIR), hydrogen nuclear magnetic resonance (H-1 NMR) spectroscopy, and scanning electron microscopy (SEM). PVA films show a loss of thermal stability due to irradiation. PVA/KLD reveals greater thermal stability than PVA and an increase in thermal stability after irradiation. These results suggest that the incorporation of KLD into PVA provides a gain in thermal and photochemical stability. FTIR, H-1 NMR, DSC, and TG results obtained for the blends suggest that intermolecular interactions between PVA and KLD chains are present. SEM micrographs revealed blend miscibility for a KLD blend content of up to 15 wt%, as observed at magnification of 1000 times. (c) 2005 Elsevier Ltd. All rights reserved.1192-1201engkraft lignin derivativepoly(vinyl alcohol)blendsNMRFTIRSEMArtigo10.1016/j.polymdegradstab.2005.05.024WOS:000236076400023Acesso restrito6475585105456744