Preparation And Infrared Performance Of Multi-phase Change Temperature-microcapsule

Phase change material (PCM) microcapsule can be used not only in traditional areas, such as energy control, temperature control and heat-exchange, but also in infrared stealthy technique. Studies on PCM microcapsule before were mostly about single-phase change temperature materials, which limited the applications of microcapsule. Multi-PCM microcapsule extends the phase-change temperature range and application areas besides intrinsic advantages. In this paper, in the foundation of preparing single-PCM microcapsule successfully, author prepared multi-phase change temperature microcapsule and studied its thermal IR performance.We can find micro-balls which were about 100nm in diameters in SEM pictures of single-PCM microcapsule samples prepared through In-situ polymerization method. DSC figures of samples showed that endothermic peaks appeared near the phase-change temperatures.Compared the micro-shapes of samples prepared by different means, we found that when quantificational MAA added in St, the solution pre-polymerized, and used AIBN/KPS as initiator, we can acquired better microcapsules.SEM pictures of multi-PCM microcapsule sample, which was synthesized via the approach above showed the excellent micro-shape of 100-nm balls. FTIR figure indicated the existence of P (St-co-MMA) (as wall material) and paraffin (as core material). DSC figure indicated that three endothermic peaks appeared near the phase-change temperatures.During the heating-up process, the temperature of microcapsule was lower than that of pure PMAA powder. It means that the microcapsule we prepared can reduce the intensity of infrared radiation in a certain extent when being covered on targets.