TMXDI-based poly(ether urethane)/polystyrene interpenetrating polymer networks: 2. Tg behaviour, mechanical properties and modulus-composition studies
In this, the second of two papers on a series of simultaneous polyurethane (PUR)/polystyrene (PS) interpenetrating polymer networks (IPNs), the T g behaviour, mechanical properties and modulus–composition relations have been studied. A gross phase morphology over the full IPN composition range was i...
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Published in | Polymer (Guilford) Vol. 39; no. 23; pp. 5609 - 5617 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
1998
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | In this, the second of two papers on a series of simultaneous polyurethane (PUR)/polystyrene (PS) interpenetrating polymer networks (IPNs), the
T
g behaviour, mechanical properties and modulus–composition relations have been studied. A gross phase morphology over the full IPN composition range was indicated by two separate loss factor peaks from dynamic mechanical thermal analysis (DMTA). Both DMTA and modulated-temperature differential scanning calorimetry (MT-d.s.c.) measurements revealed that the
T
g of the PS transition increased with decreasing PS content in the IPN. This was explained by an increase in interactions between the PUR hard segments and the
π-electrons of the PS phenyl rings. Despite the phase-separated morphology, materials with good mechanical properties were obtained. The tensile properties and the Shore hardness results were comparable to similar semi-miscible PUR/PEMA IPNs. The Budiansky modulus–composition relation resulted in the best fit with the experimental data, indicating phase inversion at mid-range compositions. Modulus–composition studies, indicating that phase inversion occurred at the 30:70 PUR/PS IPN composition, corroborated the electron microscopy findings from the first paper in this series. |
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ISSN: | 0032-3861 1873-2291 |
DOI: | 10.1016/S0032-3861(98)00015-9 |