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以聚己内酯(PCL)和碳纳米管(CNTs)为主要材料,采用熔融共混制备PCL/CNTs复合材料。随着CNTs含量增加,以直径为10 nm的CNTs(简称CNTs10)制备的PCL/CNTs10复合材料的拉伸强度先增加后降低,以直径为5 nm的CNTs(简称CNTs5)制备的PCL/CNTs5复合材料的拉伸强度先减小后增大,断裂伸长率先降低后增加,体积电阻率逐步降低。CNTs含量相同时,PCL/CNTs5复合材料的体积电阻率小于PCL/CNTs10;CNTs5含量分别为12%和14%时,复合材料的体积电阻率分别为0.92Ω·cm和0.52Ω·cm。扫描电子显微镜分析发现,随着CNTs含量增加,复合材料表面暴露的CNTs5数量逐渐增多,当CNTs10含量≥12%和CNTs5含量≥10%时出现一定的团聚。CNTs5含量为12%的复合材料综合性能最佳,其体积电阻率为0.92Ω·cm、拉伸强度为26.4 MPa、断裂伸长率为267.7%、撕裂强度为46.0 N/cm;在3.7 V直流电压下通电12 min,可从28℃上升到36℃,20 min后达到38℃,随后温度缓慢上升,该复合材料在热敷保健和医疗器械领域具有良好的应用前景。
Polycaprolactone (PCL) and carbon nanotubes (CNTs) were used as the main materials to prepare PCL / CNTs composites by melt blending. With the increase of CNTs content, the tensile strength of PCL / CNTs10 composites prepared from CNTs with diameter of 10 nm (CNTs10 for short) first increased and then decreased, and the PCL / CNTs5 composites prepared from CNTs with diameter of 5 nm (CNTs5 for short) The tensile strength of the material first decreases and then increases, the elongation at break decreases first and then increases, and the volume resistivity gradually decreases. The volume resistivity of PCL / CNTs5 composite is less than that of PCL / CNTs10 when the CNTs content is the same. The volume resistivity of the composites is respectively 0.92Ω · cm and 0.52Ω · cm when the content of CNTs5 is 12% and 14% respectively. Scanning electron microscopy analysis showed that as the content of CNTs increased, the amount of CNTs5 exposed on the surface of the composite gradually increased, and some agglomeration occurred when the content of CNTs10 ≥ 12% and the content of CNTs5 ≥ 10%. The composites with CNTs5 content of 12% had the best comprehensive properties, the volume resistivity was 0.92Ω · cm, the tensile strength was 26.4 MPa, the elongation at break was 267.7% and the tear strength was 46.0 N / cm. At 3.7 V When the DC voltage was applied for 12 min, the temperature could rise from 28 ℃ to 36 ℃ and reach to 38 ℃ after 20 min, then the temperature rose slowly. The composites have good application prospects in the field of thermal compression and medical devices.