Z箍缩靶用聚合物丝的弛豫特性

聚苯乙烯（PS），聚乙烯（PE）及其的氘代物是Z箍缩驱动惯性约束聚变（ICF）实验中的重要固体燃料容器材料，针对物理实验对其形状的特殊要求，利用高压毛细管流变仪及HAUL-OFF熔体拉伸测试单元进行熔融纺丝，制备出直径为30～100 μm的聚合物丝样品。通过对PS，PE以及氘代聚苯乙烯（DPS）丝的力学弛豫性质研究发现：在相同的恒定应力下，实验用PS丝的蠕变量明显小于PE丝，PS丝表现出更好的尺寸稳定性；当定伸长为1％时，PS丝的松弛率明显小于PE丝；DPS丝的蠕变及应力松弛行为与PS丝具有相同的变化趋势。

Relaxation property of polymer filaments used in Z-pinch target

Polystyrene(PS), polyethylene(PE) and their deuterated polymers are important fuel container materials of Z-pinch driven ICF experiment. To meet the shape demand of physical experiment, filaments with the diameter of 30～100 μm were prepared by melt spinning via high pressure capillary rheometer and its accessory section HAUL-OFF system. According to the study on mechanical relaxation properties of PS, PE and deuterated polystyrene(DPS) filaments, the creep deformation of PS filament is obviously less than that of PE filament. PS filament shows better dimensional stability. When the fixed percentage of elongation is 1%, the stress relaxation rate of PS filament is also significantly less than PE filament’s. The creep deformation and stress relaxation behaviors of DPS filament and PS fila