01978naa a2200265 a 450000100080000000500110000800800410001910000220006024501390008226000090022152012040023065000230143465000180145765300120147565300180148765300170150565300170152265300220153970000180156170000170157970000240159670000200162070000170164077300550165721139542019-12-10       2019    bl uuuu     u00u1 u    #d1 aDELUCIS, R. de A.  aSurface response and photodegradation performance of bio-based polyurethane-forest derivatives foam composites.h[electronic resource]  c2019  aRigid polyurethane (PU) foams are popular expanded polymers mostly due to their thermal and mechanical properties, although aesthetical features and photodegradation resistance are also of interest for certain applications. In this study, four different forest-based wastes (wood, bark, kraft lignin and paper sludge) were incorporated into rigid PU foams and their surface response and photodegradation resistance were investigated. The rigid foams were prepared via free rise pouring method and later aged by UV radiation. Their colour and specular gloss were evaluated according to the CIELab method. Contact angle measurements and morphological characterization by optical (OM) and scanning electron microscopy (SEM) were also carried out. The forestbased fillers induced different colour patterns on the rigid foams and their photodegradation yielded a decrease in L* and specular gloss and an increase in a* and b*, especially over the first 20 days of UV-exposure. These effects were accompanied by an increase in surface wettability and weakening of the foam structure. Also, the foams of darker colour (i.e. with bark and kraft lignin fillers) presented greater photodegradation resistance.  aComposite polymers  aPolyurethanes  aBiofoam  aCIELAB method  aKraft lignin  aPaper sludge  aPolyurethane foam1 aKERCHE, E. F.1 aGATTO, D. A.1 aMAGALHAES, W. L. E.1 aPETZHOLD, C. L.1 aAMICO, S. C.  tPolymer Testinggv. 80, article 106102, Dec. 2019.