用于生物医学应用的熔融长丝制造技术制备的聚乳酸-CF 复合材料的体外降解分析和力学性能表征

IF 3.6 4区 材料科学 Q2 MATERIALS SCIENCE, COMPOSITES Journal of Thermoplastic Composite Materials Pub Date : 2023-12-01 DOI:10.1177/08927057231219928
Krishnakumar S, Senthilvelan T
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引用次数: 0

摘要

本研究的目的是研究不同体积分数的碳纤维增强聚乳酸(PLA)复合材料的体外降解行为。采用熔丝制造技术(FFF)制备复合材料。将试样在模拟体液中浸泡8周,通过考察重量变化、pH变化和力学性能退化情况,研究复合材料的降解行为。结果表明,碳纤维增强材料的加入降低了复合材料的拉伸强度、弯曲强度、冲击强度和抗压强度。此外,CF的加入提高了复合材料的拉伸模量。退火后的复合材料的力学性能比加工后的复合材料得到了提高。采用差示扫描量热仪(DSC)研究了复合材料的热特性和结晶度。CF的加入降低了复合材料的结晶度。利用扫描电子显微镜对拉伸断裂试样的断口形貌进行了研究。碳纤维增强材料的加入加速了复合材料的降解行为。与纯PLA复合材料相比,PLA- cf复合材料浸泡在SBF中,重量和pH值发生了显著变化,力学性能下降。退火复合材料的抗降解性能优于预制复合材料。利用扫描电子显微镜研究了复合材料在SBF中的表面形貌。
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In vitro degradation analysis and mechanical characterization of PLA-CF composites prepared by fused filament fabrication technique for bio-medical applications
The objective of this research work is to study the in vitro degradation behavior of as-fabricated and annealed Poly Lactic Acid (PLA) composites reinforced with varying volume fractions of carbon fiber (CF).The composites are prepared by fused filament fabrication technique (FFF). Specimens are immersed in simulated body fluid (SBF) for 8 weeks to study the degradation behavior of the composites by examining the change in weight, change in pH and degradation in mechanical properties. The obtained results show that the addition of carbon fiber reinforcement reduces the tensile strength, flexural strength, impact strength and compressive strength of the composites. Further, CF addition enhances the tensile modulus of the composite. The mechanical properties of annealed composites are enhanced when compared to as-fabricated composites. Differential Scanning Calorimeter (DSC) is employed to study the thermal characteristics of the composites and % crystallinity of the composites. CF addition reduces the crystallinity of the composites. Fractographs of the tensile fractured specimens are studied using a scanning electron microscope (SEM). The addition of the carbon fiber reinforcement is found to accelerate the degradation behavior of the composites. There is significant change in weight and pH as well as degradation in mechanical properties of PLA-CF composites immersed in SBF than pure PLA composites. Annealed composites show better degradation resistance than as-fabricated composites. SEM is employed to study the surface morphology of the composites immersed in SBF.
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来源期刊
Journal of Thermoplastic Composite Materials
Journal of Thermoplastic Composite Materials 工程技术-材料科学:复合
CiteScore
8.00
自引率
18.20%
发文量
104
审稿时长
5.9 months
期刊介绍: The Journal of Thermoplastic Composite Materials is a fully peer-reviewed international journal that publishes original research and review articles on polymers, nanocomposites, and particulate-, discontinuous-, and continuous-fiber-reinforced materials in the areas of processing, materials science, mechanics, durability, design, non destructive evaluation and manufacturing science. This journal is a member of the Committee on Publication Ethics (COPE).
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