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 wer… Show more
“…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…”
“…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…”
“…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].…”
In the present study, the interpenetrated polymer networks (IPN) foams of polyurethane (PU) and poly(methyl methacrylate) (PMMA) with different ratio of PU/PMMA (i.e. 85/15, 75/25 and 65/35) were prepared using the polymerisation process. The acoustical, damping and thermal properties of synthesised IPN foams with regard to different compositions were studied. As indicators of effective damping capability, viscoelastic parameters including loss factor (tan δ), glass transition temperature (T g ) and effective damping interval (tan δ > 0.3) were also determined. The results show that the T g shifted to higher temperature ranges, and the damping temperature range (tan δ > 0.3) increased when the IPN was formed. The sound absorption coefficient results show that because of the formation of IPN, the soundabsorbing capacity of prepared samples increased at a certain frequency, and the resonance frequency shifted to lower frequencies by increasing the PMMA content in IPN foams.
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