Morphology and damping behavior of polyurethane/PMMA simultaneous interpenetrating networks

Abstract

A series of polyurethane/PMMA simultaneous interpenetrating networks (SINs) with various hard segment contents (X) in the polyurethane phase (X = 15.5 to 36.5% in polyurethane) and wide range of polyurethane (PU) to polyacrylate (PA) ratio (PU/PA = 20:80 to 80:20) were prepared, and the damping and mechanical properties of these materials were studied. The damping of polyurethane soft phase was increased and shifted to lower temperature with increased content of PA vitreous phase. The mechanical properties were improved with increasing PA contents. The results show that PA and the polyurethane hard segment interaction play a special role in chain interpenetration density and its magnitude is revealed by the decreased dispersed domain size observed by scanning electron microscopy (SEM) and increased loss area as measured by dynamic mechanical thermal analysis (DMTA). When the weight ratio of PU/PA was 40:60, the resulting SIN materials possessed better damping properties, independent of X concentration

Poly(ester urethane)s with polycaprolactone soft segments: A morphological study

“…Similar studies26, 27 were reported with some structural differences in the hard block. In this study, the hard blocks formed amorphous hard domains, and this is the first in which the soft‐segment/hard‐segment content was varied systematically, so this variation was correlated with the polymer morphology, as we had previously done for other polyurethane systems 28–30…”

Acoustical, damping and thermal properties of polyurethane/poly(methyl methacrylate)-based semi-interpenetrating polymer network foams

“…The undesired properties of pure PU including the absorption of mechanical energy in a narrow frequency range and low mechanical and thermal resistance can be improved by blending with other polymers and producing an IPN [4,13]. Therefore, PU/PMMA IPNs combining the advantages of both PU and PMMA have been extensively studied [14,[16][17][18][19][20][21][22].…”