Molecular dynamics in polyurethane foams chemically reinforced with POSS

• DOI: 10.1007/s00289-018-2528-2
• Publication Date: 2018-09-18T10:17:35Z
• Authors: Konstantinos N. R...; Joanna Pagacz; Jan Ozimek; Stefanos Koutsoumpis; Sławomir Michałowski; Edyta Hebda; Jan Pielichowski; Krzysztof Pielich...
• Keywords: Dynamics

In this work, we report on the thermal and thermomechanical properties of rigid PU foams modified with POSS moieties, paying special attention to molecular dynamics these systems. 1,2-Propanediolisobutyl (PHI-POSS) are used as pendent groups octa(3-hydroxy-3-methylbutyldimethylsiloxy) (OCTA-POSS) serve chemical crosslinks. DSC reveals an initial slowing down segmental for small loadings (5 wt%) both followed by acceleration, probably due changes in topology network morphology foam. A low-temperature mechanical relaxation is observed DMA attributed tentatively a local β relaxation, much similar that hyperbranched polyurethanes.