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首页> 外文期刊>Acta biomaterialia >Long-term toughness of photopolymerizable (meth)acrylate networks in aqueous environments.
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Long-term toughness of photopolymerizable (meth)acrylate networks in aqueous environments.

机译：在水性环境中可光聚合的（甲基）丙烯酸酯网络的长期韧性。

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Photopolymerizable (meth)acrylate networks are potentially advantageous biomaterials due to their ability to be formed in situ, their fast synthesis rates and their tailorable material properties. The objective of this study was to evaluate how immersion time in phosphate-buffered saline (PBS) affects the toughness of photopolymerizable methyl acrylate (MA)-co-methyl methacrylate-co-poly(ethylene glycol) dimethacrylate networks containing various concentrations of MA. Stress-strain behavior was determined by performing tensile strain to failure testing after soaking in PBS for different periods (1 day up to 9 months). In tandem, differential scanning calorimetry and PBS content measurements were undertaken at each time point in order to determine whether time-dependent changes in toughness were related to changes in T(g) or PBS absorption. The effect of immersion time on network toughness was shown to be dependent upon composition in a manner related to the viscoelastic state of the polymer upon initial immersion in PBS. The results demonstrate that tough acrylate-based materials may not maintain their toughness after several months in PBS. In addition, decreasing the PBS content by changing the network hydrophobicity resulted in better toughness maintenance after 9 months. The results provide a possible means to toughen various amorphous acrylate-based implant materials that are being explored for load-bearing biomedical applications, beyond the systems considered in this work.
机译：由于可光聚合的（甲基）丙烯酸酯网络原位形成的能力，快速的合成速率和可定制的材料性能，它们是潜在的有利生物材料。这项研究的目的是评估在磷酸盐缓冲盐水（PBS）中的浸泡时间如何影响包含各种浓度MA的可光聚合丙烯酸甲酯（MA）-甲基丙烯酸甲酯/聚乙二醇二甲基丙烯酸酯网络的韧性。通过在PBS中浸泡不同时间（1天到9个月）后进行拉伸应变破坏测试来确定应力应变行为。同时，在每个时间点进行差示扫描量热法和PBS含量测量，以确定韧性的时间依赖性变化是否与T（g）或PBS吸收的变化有关。浸入时间对网络韧性的影响显示出取决于组成的方式，该方式与最初浸入PBS中时聚合物的粘弹性状态有关。结果表明，坚韧的丙烯酸酯基材料在PBS中放置数月后可能无法保持其韧性。此外，通过改变网络疏水性降低PBS含量可在9个月后更好地保持韧性。该结果提供了一种可能的手段，可以使各种非晶态的基于丙烯酸酯的植入物材料变得坚韧，这超出了本工作考虑的系统范围，这些材料正在被研究用于承载生物医学应用。

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