| 초록 |
polyimide composites containing negative thermal expansion material is synthesized from 4,4’-oxydianiline (ODA), 1,2,4,5-benzentetracarboxylic dianhydride (PMDA) and zirconium molybdate. The negative thermal expansion material cubic ZrMo2O8 is prepared by the carefully controlled dehydration of ZrMo2O7(OH2)•2H2O. The residual stress behavior during imidization up to 400°C and its relaxation behavior were measured in situ using thin film stress measurement system (TFSMS). Measured CTE value of ZrMo2O8/PMDA-ODA hybrid film containing 0~25 wt% ceramic loading show a reduction in thermal expansion with increasing ceramic content. Consequently, thermal stress of the film was reduced with increasing ceramic content. |
