期刊
MATERIALS
卷 14, 期 19, 页码 -出版社
MDPI
DOI: 10.3390/ma14195730
关键词
biomaterial; degradation; accelerated life testing; material testing; PLA
类别
资金
- National Institute of Food and Agriculture, U.S. Department of Agriculture, under the Wheels of Change Grant [2015-38422-24112]
- National Institute of Food and Agriculture, U.S. Department of Agriculture, under the I-DISCOVER Grant [2014-38422-22078]
The study investigates the degradation mechanism of Polylactic Acid (PLA) through accelerated degradation testing of ASTM specimens, finding a significant impact of the independent variable time. The proposed statistical models can serve as a tool for characterizing the durability of biopolymer as an engineering material.
While the degradation of Polylactic Acid (PLA) has been studied for several years, results regarding the mechanism for determining degradation are not completely understood. Through accelerated degradation testing, data can be extrapolated and modeled to test parameters such as temperature, voltage, time, and humidity. Accelerated lifetime testing is used as an alternative to experimentation under normal conditions. The methodology to create this model consisted of fabricating series of ASTM specimens using extrusion and injection molding. These specimens were tested through accelerated degradation; tensile and flexural testing were conducted at different points of time. Nonparametric inference tests for multivariate data are presented. The results indicate that the effect of the independent variable or treatment effect (time) is highly significant. This research intends to provide a better understanding of biopolymer degradation. The findings indicated that the proposed statistical models can be used as a tool for characterization of the material regarding the durability of the biopolymer as an engineering material. Having multiple models, one for each individual accelerating variable, allow deciding which parameter is critical in the characterization of the material.
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