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首页> 外文期刊>Acta biomaterialia >Tungsten disulfide nanotubes reinforced biodegradable polymers for bone tissue engineering
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Tungsten disulfide nanotubes reinforced biodegradable polymers for bone tissue engineering

机译：二硫化钨纳米管增强的可生物降解聚合物，用于骨组织工程

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In this study, we have investigated the efficacy of inorganic nanotubes as reinforcing agents to improve the mechanical properties of poly(propylene fumarate) (PPF) composites as a function of nanomaterial loading concentration (0.01-0.2 wt.%). Tungsten disulfide nanotubes (WSNTs) were used as reinforcing agents in the experimental group. Single- and multi-walled carbon nanotubes (SWCNTs and MWCNTs) were used as positive controls, and crosslinked PPF composites were used as the baseline control. Mechanical testing (compression and three-point bending) shows a significant enhancement (up to 28-190%) in the mechanical properties (compressive modulus, compressive yield strength, flexural modulus and flexural yield strength) of WSNT-reinforced PPF nanocomposites compared to the baseline control. In comparison to the positive controls, significant improvements in the mechanical properties of WSNT nanocomposites were also observed at various concentrations. In general, the inorganic nanotubes (WSNTs) showed mechanical reinforcement better than (up to 127%) or equivalent to that of carbon nanotubes (SWCNTs and MWCNTs). Sol fraction analysis showed significant increases in the crosslinking density of PPF in the presence of WSNTs (0.01-0.2 wt.%). Transmission electron microscopy (TEM) analysis on thin sections of crosslinked nanocomposites showed the presence of WSNTs as individual nanotubes in the PPF matrix, whereas SWCNTs and MWCNTs existed as micron-sized aggregates. The trend in the surface area of nanostructures obtained by Brunauer-Emmett-Teller (BET) surface area analysis was SWCNTs > MWCNTs > WSNTs. The BET surface area analysis, TEM analysis and sol fraction analysis results taken together suggest that chemical composition (inorganic vs. carbon nanomaterials), the presence of functional groups (such as sulfide and oxysulfide) and individual dispersion of the nanomaterials in the polymer matrix (absence of aggregation of the reinforcing agent) are the key parameters affecting the mechanical properties of nanostructure-reinforced PPF composites and the reason for the observed increases in the mechanical properties compared to the baseline and positive controls.
机译：在这项研究中，我们研究了无机纳米管作为增强剂的效果，该增强剂可改善聚富马酸丙二酯（PPF）复合材料的机械性能，其随纳米材料负载浓度（0.01-0.2 wt。％）的变化而变化。实验组中使用二硫化钨纳米管（WSNT）作为增强剂。单壁和多壁碳纳米管（SWCNT和MWCNT）用作阳性对照，交联的PPF复合材料用作基线对照。机械测试（压缩和三点弯曲）显示，与WSNT增强的PPF纳米复合材料相比，WSNT增强的PPF纳米复合材料的机械性能（压缩模量，压缩屈服强度，弯曲模量和弯曲屈服强度）有显着提高（高达28-190％）。基线控制。与阳性对照相比，在各种浓度下也观察到WSNT纳米复合材料机械性能的显着改善。通常，无机纳米管（WSNT）的机械增强性能优于（高达127％）或与碳纳米管（SWCNT和MWCNT）相当。溶胶分数分析表明，在存在WSNT（0.01-0.2 wt。％）的情况下，PPF的交联密度显着增加。对交联的纳米复合材料的薄片进行的透射电子显微镜（TEM）分析表明，WSNT作为PPF基质中的单个纳米管存在，而SWCNT和MWCNT作为微米级聚集体存在。通过Brunauer-Emmett-Teller（BET）表面积分析获得的纳米结构的表面积趋势为SWCNTs> MWCNTs> WSNTs。 BET表面积分析，TEM分析和溶胶分数分析结果共同表明，化学成分（无机与碳纳米材料），官能团（例如硫化物和氧硫化物）的存在以及纳米材料在聚合物基质中的单独分散（没有增强剂的聚集）是影响纳米结构增强的PPF复合材料机械性能的关键参数，以及与基线和阳性对照相比观察到的机械性能提高的原因。

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