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首页> 外文期刊>Journal of Applied Polymer Science >Improved oxidative biostability of porous shape memory polymers by substituting triethanolamine for glycerol
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Improved oxidative biostability of porous shape memory polymers by substituting triethanolamine for glycerol

机译：通过将三乙醇胺代替甘油来改善多孔形状记忆聚合物的氧化生物稳定性

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摘要

While many aromatic polyurethane systems suffer from poor hydrolytic stability, more recently proposed aliphatic systems are oxidatively labile. The use of the renewable monomer glycerol as a more oxidatively resistant moiety for inclusion in shape memory polymers (SMPs) is demonstrated here. Glycerol-containing SMPs and the amino alcohol control compositions are compared, with accelerated degradation testing displaying increased stability (time to complete mass loss) as a result of the inclusion of glycerol without sacrificing the shape memory, thermal transitions, or the ultralow density achieved with the control compositions. Gravimetric analysis in accelerated oxidative solution indicates that the control will undergo complete mass loss by approximately 18 days, while lower concentrations of glycerol will degrade fully by 30 days and higher concentrations will possess approximately 40% mass at the same time. In real-time degradation analysis, high concentrations of glycerol SMPs have 96% mass remaining at 8 months with 88% gel fraction remaining that that time, compared to less than 50% mass for the control samples with 5% gelation. Mechanically, low glycerol-containing SMPs were not robust enough for testing at three months, while high glycerol concentrations displayed increased elastic moduli (133% of virgin materials) and 18% decreased strain to failure. The role of the secondary alcohol, as well as isocyanates, is presented as being a crucial component in controlling degradation; a free secondary alcohol can more rapidly undergo oxidation or dehydration to ultimately yield carboxylic acids, aldehydes, carbon dioxide, and alkenes. Understanding these pathways will improve the utility of medical devices through more precise control of property loss and patient risk management through reduced degradation. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47857.
机译：虽然许多芳族聚氨酯体系患有差的水解稳定性，但最近提出的脂族系统是氧化不稳定的。这里证明了使用可再生单体甘油作为更具氧化抗性部分（SMPS）的含量掺入形状记忆聚合物（SMPS）。比较含甘油的SMP和氨基醇对照组合物，随着在不牺牲形状记忆，热转变或通过的超大密度而使甘油的稳定性（时间来完成质量损失）增加（时间来完成质量损失）。控制组合物。加速氧化溶液中的重量分析表明，对照将通过大约18天进行全部质量损失，而较低浓度的甘油将完全降解30天，同时较高浓度将具有约40％的质量。在实时降解分析中，高浓度的甘油SMPS在8个月内剩余96％质量，其余88％的凝胶分数剩余时间，而且对照样品的质量相比，具有5％凝胶化的对照样品。机械地，含低甘油的SMP不足以在三个月内测试，而高甘油浓度显示出增加的弹性模量（133％的原始材料）和18％降低的失效减少。仲醇以及异氰酸酯的作用呈现为控制降解的关键组分;自由仲醇可以更快地进行氧化或脱水，最终产生羧酸，醛，二氧化碳和烯烃。了解这些途径通过降低降解，通过更精确控制性能损失和患者风险管理来改善医疗器械的效用。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47857。

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