In this paper, a thermo-responsive shape memory effect in a polyvinyl chloride thermoset foam is characterized. Excellent shape recovery performance is observed in foam samples programmed both at room temperature and above their transition temperature. The conversion of porous structures in the foam from closed-cell to open-cell after a shape memory effect cycle is revealed via a series of specially designed oil-dripping experiments and optical images of the micro pores. Programming the strain higher than 20% results in an apparent increase in open-cell level, whereas programming temperatures have almost no influence.
In this paper, the temperature memory effect (TME) in a commercial ethylenevinyl acetate copolymer (EVA) is characterized via differential scanning calorimetry (DSC) tests. Three temperatures, which are 35, 60, and 85 C representing temperatures below glass transition (T g), within T g and within melting (T m), respectively, are included for the investigation. It is found that TME in polymers is not as reported to be limited at around either T g or T m only, the effective temperature range for TME could be actually much wider that covers from below T g to up to T m. In addition, it is concluded that higher heating stop temperature (T s) erases the memory of previous lower ones in this EVA. Hysteresis (described by ΔT) between the temperature of turning points
Alumina microfiltration membrane was prepared with solid particle sintering method by changing the content of TiO2. The membrane flux, rejection to PEG10000 and rupture strength were tested. The results showed that: when the firing temperature is 1400°C, PVA is 2%, TiO2 is 1%, alumina microfiltration membrane flux reached 1.93m3/m2·h, PEG10000 retention rate is 13.5%, and the flexural strength is 74.38MPa.
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