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首页> 外文期刊>Journal of Applied Polymer Science >Surface-modified halloysite nanotubes reinforced poly(lactic acid) for use in biodegradable coronary stents
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Surface-modified halloysite nanotubes reinforced poly(lactic acid) for use in biodegradable coronary stents

机译：表面改性的Holloysite纳米管增强聚（乳酸）用于可生物降解的冠状动用支架

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Poly(lactic acid) (PLA) was reinforced halloysite nanotubes (HNTs) in this study. To improve dispersion and interfacial adhesion of HNTs within the PLA matrix, HNTs were surface modified with 3-aminopropyltriethoxysilane (ASP) prior to compounding with PLA. PLA/ASP-HNTs nanocomposites were characterized by differential scanning calorimetry (DSC), Fourier transfer infrared spectroscopy (FTIR), surface wettability, thermogravimetric analysis, transmission electron microscopy (TEM), and tensile testing. The hemocompatibility and cytocompatibility of PLA and PLA composites were investigated and the in vitro degradation process of PLA/ASP-HNTs composites was investigated for a period of 6 months by gel permeation chromatography, FTIR, weight loss measurement, DSC, and tensile testing. PLA and all PLA composites were blood compatibile and non-cytotoxic. TEM analysis revealed that HNTs agglomeration in PLA matrix was reduced by surface treatment with ASP. ASP-HNTs had better reinforcing effect than unmodified HNTs evidenced by tensile testing. ASP-HNTs appeared to increase the hydrolytic degradation process as measured by weight measurement. PLA/ASP-HNTs composites displayed 12.1% weight loss and 30.6% average molecular weight reduction while retaining 74% of Young's modulus by the 24th week of degradation. Based on this data, the reinforcement of PLA using ASP-HNTs may prove beneficial for applications such as biodegradable stents. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46521.
机译：本研究中，聚（乳酸）（PLA）加强了Holloysite Nanotubes（HNT）。为了改善PLA基质内HNT的分散和界面粘附，在用PLA复合之前用3-氨基丙基三乙氧基硅烷（ASP）改性HNT。通过差示扫描量热法（DSC），傅里叶转移红外光谱（FTIR），表面润湿性，热重分析，透射电子显微镜（TEM）和拉伸测试，表征PLA / ASP-HNT纳米复合材料。研究了PLA和PLA复合材料的血液相色和细胞锁定性，并通过凝胶渗透色谱法，FTIR，减肥测量，DSC和拉伸试验研究了PLA / ASP-HNT复合材料的体外降解过程。 PLA和所有PLA复合材料都是血液相容和非细胞毒性。 TEM分析显示，通过用ASP的表面处理降低了PLA基质中的HNT凝聚。 ASP-HNT具有比拉伸试验所证明的未修饰的HNT更好的增强效果。 ASP-HNT似乎通过重量测量测量的水解降解过程。 PLA / ASP-HNT复合材料显示12.1％减重和平均分子量减少30.6％，同时通过第24周保留74％的杨氏模量。基于该数据，使用ASP-HNT的PLA加强可以对可生物降解支架等应用来说是有益的。 （c）2018 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,46521。

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