热塑性聚氨酯防辐射复合材料的性能

Properties of radiation-proof thermoplastic polyurethane composites

通过机械共混法制备了La2（CO3）3，Ce2（CO3）3，Pr2（CO3）2，Nd2（CO3）3／热塑性聚氨酯（TPU）复合材料，研究了镧系碳酸盐／TPU复合材料的防辐射性能，讨论了添加La2（CO3）3／TPU回收料对其力学性能和屏蔽性能的影响。结果表明，在120kV的入射管电压下。当镧系碳酸盐用量低于400份时，La2（CO3）3／TPU，Ce2（C03）3／TPU，Pr2（CO3）3／TPU，Nd2（CO3）3／TPU复合材料的防辐射性能基本相当；当镧系碳酸盐用量超过400份时，Nd2（CO3）3／TPU复合材料的防辐射性能最好。在入射管电压为70-120kV时，4种镧系碳酸盐／TPU复合材料的防辐射性能随着入射管电压的增加先增强后减弱，在85～105kV出现峰值；除了Ce2（CO3）3／TPU复合材料以外，随着镧系元素原子序数的增加，其他复合材料的最佳防辐射峰值右移，且范围变宽。添加回收La2（CO3）3／TPU对La2（CO3）3／TPU复合材料的防辐射性能影响不大，只是其力学性能有所下降，但仍然能满足使用要求。

La2 （CO3）3, Ce2 （CO3）3, Pr2 （CO3）3, Nd2 （ CO3 ） 3/ thermoplastic polyurethane （ TPU ） composites were prepared by mechanical blending process, the radiationproof properties of the lanthanide carbonate/TPU composites were investigated. The mechanical and radiation-proof properties of the composites with different contents of recycled La2 （CO3 ）3/TPU were also researched. The results indicated that under the incident voltage 120 kV, the radiation-proof properties of the four composites were almost the same when the amount of lanthanide carbonate was less than 400 phr and the radiation-proof properties of Nd2 （ CO3 ） 3/TPU composites were better than the others when the amount of lanthanide carbonate was over 400 phr. The radiation-proof properties of these composites firstly improved and then declined as the incident voltage increased in the range of 70 - 120 kV . There were optimal peak values ranging from 85 kV to 105 kV and the peak moved right and the ranging broadened with the increase of the atomic number except Ce2 （ CO3 ） 3/TPU composites. Adding the recycled La2 （CO3 ）3/TPU had little effect on the radiation-proof properties of La2 （ CO3 ）3/TPU composites while the mechanical properties decreased slightly and it could meet the requirement of the application.