Polystyrene/magnetite hybrid foams prepared via 60Co γ-ray radiation of high internal phase emulsions

Abstract

In this study, polystyrene (PS) solid foam with cell size of about 1 um and low polydispersity is prepared via γ-ray radiation induced high internal phase emulsions (HIPEs) at room temperature. The density of the foams can be as low as 0.05 g/cm 3 . The kinetics and molecule weight of styrene (S) polymerizing in continuous phase of HIPEs is studied. It is found that the molecule weight is greatly lower than the PS obtained from the polymerization in dispersed phase of emulsion. In addition, the authors study the mechanical properties of solid foam. The compression resistance of solid foam obtained from radiation method is better than these obtained from conventional method. At the same time, magnetite is added into the dispersed phase when prepared the HIPEs to fabricate magnetite hybrid PS foam. The saturation magnetization (Ms), remanent magnetization (Mr), and coercivity (Hc) of the hybrid foam are 25 emu/g, 15 emu/g, and 350 Oe, respectively. The results revealed that the hybrid foams have some superparamagnetic.

Synthesis and properties of polystyrene-based polyHIPEs reinforced with quadruple hydrogen bond functionality

“…Luo [39] introduced RAFT polymerization method into the preparation of polyHIPE, its Young's modulus increased significantly, but the porosities of resultant polyHIPEs were relative low. Furthermore, initiating systems have an important effect on the mechanical properties of polyHIPEs [41,35]. Polystyrene/magnate hybrid foams prepared via γ-ray radiation of HIPEs have better compression resistance than those obtained by conventional initiating methods, which may be attributable to the smaller void size and less polydispersity of void size [41,35].…”

“…Furthermore, initiating systems have an important effect on the mechanical properties of polyHIPEs [41,35]. Polystyrene/magnate hybrid foams prepared via γ-ray radiation of HIPEs have better compression resistance than those obtained by conventional initiating methods, which may be attributable to the smaller void size and less polydispersity of void size [41,35]. However, the use of γ-ray is itself a safety problem.…”

Polychloroprene rubber/ethylene-propylene diene monomer/multiple walled carbon nanotube nanocomposites: synergistic effects of radiation crosslinking and MWNT addition

“…Vulcanization of elastomers using high energy radiation is expected to provide uniformly crosslinked networks in comparison to conventionally vulcanized networks. The low operation cost, additive free technique and room temperature operations are among the added advantages of radiation crosslinking over the existing crosslinking techniques [7,12,13].…”

Polymerization of MMA in polyHIPEs by RATRP

“…It is difficult to accurately control the pore size and pore size distribution of the porous polymer by these methods. Lately, considerable attention is being paid on porous polymers prepared by using high internal phase emulsions (HIPEs) template method [5][6][7][8]. It is easy to adjust the pore size and pore size distribution of porous polymers with this method.…”