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- W598988694 abstract "A number of simultaneous interpenetrating polymer networks (IPNs) wereinvestigated with regard to morphology and energy absorbing ability. The materialswere all based on polyurethane (PUR) with the second polymer components beingpolystyrene (PS) or poly(ethyl methacrylate) (PEMA). Also, three-component IPNswere synthesised. This was achieved by incorporating functionalised PS latex particlesinto a PUR/poly(butyl methacrylate) (PBMA) IPN. The morphology of the IPNs wasdetermined with dynamic mechanical thermal analysis (DMTA), transmission (TEM)and scanning (SEM) electron microscopy and modulated-temperature differentialscanning calorimetry (M-TDSC). The mechanical properties were investigated usingtensile testing and hardness measurements.The PUR/PS IPNs were found to be grossly phase separated at every composition,even when crosslinked at very high levels. However, a structural modification of thematerials was conducted by introducing inter-network grafting, compatibilisers andionic interactions. All three structure modifications proved successful in achieving afiner morphology. By conducting a stirred synthesis, a very complicated morphologywith a very high and broad transition was obtained. The PUR/PEMA IPNs were semimiscibleand the 70:30 composition exhibited a very broad, almost rectangular,transition as evidenced by DMTA data. Phase domains between I - 500 run werefound by TEM. The degree of mixing and, thus, the location and breadth of thetransition could be adjusted by varying the composition and the crosslink densities inboth networks. Also, variation of the chemical nature of the PUR soft and hardsegments proved successful in obtaining a broad transition range.Materials with a controlled microheterogeneous morphology which exhibited excellentenergy absorbing characteristics were developed. PUR/PEMA IPNs generallyexhibited better damping properties as indicated by the area under the linear lossmodulus (LA) and· loss factor (TA) curves. Some of these materials exhibited valuesfor the loss factor of >- 0.3 spanning a temperature range of more than 170°C. Thestudy of IPN s containing latex' particles revealed promising results. Furtherconcentrating on this approach might yield damping materials with even broaderenergy absorbing temperature/frequency ranges." @default.
- W598988694 created "2016-06-24" @default.
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- W598988694 date "1996-01-01" @default.
- W598988694 modified "2023-09-23" @default.
- W598988694 title "Polyurethane-based simultaneous interpenetrating polymer networks of controlled microphase morphology and high damping characteristics" @default.
- W598988694 hasPublicationYear "1996" @default.
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