Effects of gamma-irradiation on UHMWPE/MWNT nanocomposites
Effects of gamma-irradiation on UHMWPE/MWNT nanocomposites
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DOI：
10.1016/j.compscitech.2010.11.013
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发表时间：
2011-02-07
影响因子：
9.1
通讯作者：
Puertolas, J. A.
中科院分区：
文献类型：
--
作者：
Martinez-Morlanes, M. J.;Castell, P.;Puertolas, J. A.
超高分子量聚乙烯（UHMWPE）是一种广泛用于工业和骨科应用的聚合物。在这项工作中，原始的多壁碳纳米管（MWCNTs）以不同的浓度（1，3和5 wt.%）掺入到UHMWPE中使用球磨工艺。UHMWPE/MWCNT纳米复合材料在90 kGy下进行伽马辐照，以改善MWCNT和聚合物基体之间的相互作用。通过透射电子显微镜（TEM）、差示扫描量热法（DSC）、热重分析（TGA）和单轴拉伸技术对材料的结构、热性能和力学性能进行了表征。γ射线辐照使熔融温度、结晶度和最大分解速率温度升高。辐照使纯UHMWPE的韧性降低38%。MWCNT的掺入并没有显着影响纯UHMWPE的熔点，但降低了原始UHMWPE的结晶度，这与UHMWPE片层密度的降低有关。与纯UHMWPE相比，还观察到纳米复合材料的热稳定性增加。拉伸试验表明，增强纳米复合材料的杨氏模量增加了38%，韧性略有下降（5%）。γ射线照射的纳米复合材料的结晶度增加，这是有关的增加片层厚度，也提高了它们的热稳定性。的杨氏模量增加了高达71%的辐照纳米复合材料和它们的韧性没有显着的变化相比，非辐照纳米复合材料。多壁碳纳米管的掺入减少了辐射的负面影响，并补偿了韧性的降低。这一事实可能是由于自由基清除剂行为的MWNT的辐射诱导的自由基的电子自旋共振（ESR）检测证明。(C)2010爱思唯尔有限公司版权所有。
Ultra high molecular weight polyethylene (UHMWPE) is a polymer that is widely used in industrial and orthopaedic applications. In this work, pristine multiwalled carbon nanotubes (MWCNTs) were incorporated into UHMWPE in different concentrations (1,3 and 5 wt.%) using a ball milling process. UHMWPE/MWCNT nanocomposites were gamma irradiated at 90 kGy to improve the interaction between MWCNTs and the polymer matrix. Structural, thermal and mechanical characterizations were conducted by means of transmission electron microscopy (TEM), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA) and uniaxial tensile techniques. Gamma irradiation produced an increase in the melting temperature, crystallinity and temperature of maximum decomposition rate. The irradiation produced a 38% decrease in the toughness of neat UHMWPE. The incorporation of MWCNTs did not significantly affect the melting point of the neat UHMWPE but decreased the degree of crystallinity of the raw UHMWPE, which was related to a reduction in the UHMWPE lamellar density. An increase in thermal stability was also observed for the nanocomposites compared to neat UHMWPE. The tensile tests showed a 38% increase in the Young's modulus in the reinforced nanocomposites and a small decrease in toughness (5%). Gamma irradiation of the nanocomposites increased crystallinity, which was related to an increased lamellar thickness, and also improved their thermal stability. The Young's modulus increased by up to 71% for irradiated nanocomposites and their toughness showed no significant changes in comparison with the non-irradiated nanocomposites. The incorporation of MWCNTs reduced the negative effects of irradiation and compensated for the reduction in toughness. This fact might be attributed to the radical scavenger behaviour of the MWNT as was proved by Electron Spin Resonance (ESR) detection of the radiation-induced radicals. (C) 2010 Elsevier Ltd. All rights reserved.