TY - JOUR
T1 - Norbornene POSS crosslinked EPDM composites for thermal protection system
T2 - Significant boosting mechanical and ablation resistance
AU - MA, Xutao
AU - MA, Xiaoyan
AU - WANG, Shumeng
AU - XU, Peibo
AU - ZHANG, Zongwu
AU - XU, Peidong
AU - YANG, Shishan
AU - ZHANG, Chengshuang
AU - HOU, Xiao
N1 - Publisher Copyright:
© 2025 The Author(s)
PY - 2025/12
Y1 - 2025/12
N2 - As a lightweight nanomaterial, Polyhedral Oligomeric Silsesquioxane (POSS) is widely applied to ablation resistance modification of Ethylene-Propylene-Dine Monomer (EPDM) insulation layer in aerospace propulsion thermal protection system. However, various structures of POSS can form different crosslinked structures within the EPDM, which can affect the insulation layer properties. Various functionality POSS, Mono-Norbornene POSS (MN-POSS) and Tri-Norbornene POSS (TN-POSS), were designed and synthesized to obtain crosslinked-modified EPDMs with enhanced mechanical properties and ablation resistance simultaneously, and the relationship between POSS functionality, the mechanical properties, ablation resistance, heat-shielding and thermal decomposition of EPDM/Aramid Fiber (AF) composites were explored comprehensively. MN-POSS and TN-POSS increased the tensile strength of EPDM composites by 25.3% and 75.2% respectively, reduced the linear ablation rate by 37.7% and 33.7% respectively, and reduced the back temperatures by 3.9 °C and 3.3 °C respectively. Under conditions of equal cage structure (T8), the suspended crosslinked structure caused by MN-POSS exhibited better ablation resistance and heat-shielding performance as well as thermal decomposition, and the anchored crosslinked structure caused by TN-POSS exhibited better tensile strength. The structural transformation indicates that the POSS nanocages can be transformed into a ceramic structure in cruel environments to resist the erosion of heat flow and enhance the ablation resistance of insulation layer.
AB - As a lightweight nanomaterial, Polyhedral Oligomeric Silsesquioxane (POSS) is widely applied to ablation resistance modification of Ethylene-Propylene-Dine Monomer (EPDM) insulation layer in aerospace propulsion thermal protection system. However, various structures of POSS can form different crosslinked structures within the EPDM, which can affect the insulation layer properties. Various functionality POSS, Mono-Norbornene POSS (MN-POSS) and Tri-Norbornene POSS (TN-POSS), were designed and synthesized to obtain crosslinked-modified EPDMs with enhanced mechanical properties and ablation resistance simultaneously, and the relationship between POSS functionality, the mechanical properties, ablation resistance, heat-shielding and thermal decomposition of EPDM/Aramid Fiber (AF) composites were explored comprehensively. MN-POSS and TN-POSS increased the tensile strength of EPDM composites by 25.3% and 75.2% respectively, reduced the linear ablation rate by 37.7% and 33.7% respectively, and reduced the back temperatures by 3.9 °C and 3.3 °C respectively. Under conditions of equal cage structure (T8), the suspended crosslinked structure caused by MN-POSS exhibited better ablation resistance and heat-shielding performance as well as thermal decomposition, and the anchored crosslinked structure caused by TN-POSS exhibited better tensile strength. The structural transformation indicates that the POSS nanocages can be transformed into a ceramic structure in cruel environments to resist the erosion of heat flow and enhance the ablation resistance of insulation layer.
KW - Ablative materials
KW - Crosslinking
KW - Mechanical properties
KW - Silicon compounds
KW - Thermal insulation
UR - https://www.scopus.com/pages/publications/105020257150
U2 - 10.1016/j.cja.2025.103796
DO - 10.1016/j.cja.2025.103796
M3 - 文章
AN - SCOPUS:105020257150
SN - 1000-9361
VL - 38
JO - Chinese Journal of Aeronautics
JF - Chinese Journal of Aeronautics
IS - 12
M1 - 103796
ER -