Abstract: Abstract: To optimize protective the performance of thermal protective clothing, microencapsulated phase change materials (MPCMs) were applied into the thermal protective fabric system. A modified thermal protective performance (TPP) tester was applied to assess thermal protective performance provided by these fabric system with phase change layers. In this study, three different phase-transition temperature（37, 43 and 49 ℃）, two placement location and four kinds of MPCMs with different content were selected to explore the influence of different factors on stored energy performance. Given the selected, results showed that the best thermal protective performance in this study was achieved when the phase-transition temperature of MPCMs was 43 °C and the phase change layering between thermal liner and comfort liner. And with the increasing content of MPCMs, the main thermal protective effect of simulated skin burnt changed from the heat absorption of phase change material by itself, to the heat accumulation effect of the heat storage capacity of MPCMs. However, considering the factors such as the cost, stored energy, and thermal and wet comfort of garment, the best content is 45% of MPCMs, whose second-degree skin burn time is 224.15 s, increased by 112.12% compared with the multilayer fabrics without the MPCMs.

Key words: Key words: heat radiation, microencapsulated phase change materials, multilayer fabric system, stored energy performance