ABSTRACT

The research of polylactic acid (PLA) packaging materials with high degradation rate is important toward high rate biodegradable packaging materials. The samples (PLA-mango seed residue-clays) were evaluated by degradation analysis (in water and in soil) followed by FTIR, NMR, SEM/EDS and Texturometer analysis. The samples degradation was more effective in water than in soil, probably due to a coupled effect of water and microbiological degradation. PLA-kernel-tegument samples degraded more than PLA-kernel samples due to the effectiveness action of kernel and tegument together in the samples’ degradation. PLA-Bofe samples degraded less than PLA-kernel-tegument and PLA-kernel-tegument-Bofe samples, PLA-Chocolate clay (Bofe and Chocolate are organo-montmorillonite clays) samples degraded more than PLA-kernel-tegument-Chocolate samples and less than PLA-kernel-tegument samples, probably due to multiples interaction among the Chocolate clay and mango components. The FTIR bands after samples hydrolytic and soil degradation presented low intensity, probably indicating materials degradation. New bands were observed after soil degradation, most likely related to accumulated soil and band displacement, indicative of samples degradation. The NMR relaxation data confirm the degradation process observed form the other techniques, observing the changes in the values of proton relaxation data for all samples, comparing the values after and before been degraded.

摘要

高降解率聚乳酸（PLA）包装材料的研究对高降解率生物降解包装材料具有重要意义。样品（PLA-芒果种子残留物-粘土）通过降解分析（在水中和土壤中）进行评估，然后进行 FTIR、NMR、SEM/EDS 和质构仪分析。样品在水中的降解比在土壤中更有效，这可能是由于水和微生物降解的耦合效应。PLA-kernel-tegument 样品比 PLA-kernel 样品降解得更多，这是由于内核和外皮共同在样品降解中的有效作用。PLA-Bofe 样品的降解程度低于 PLA-kernel-tegument 和 PLA-kernel-tegument-Bofe 样品，PLA-巧克力粘土（Bofe 和巧克力是有机蒙脱石粘土）样品比 PLA-果仁-外皮-巧克力样品降解得更多，而比 PLA-果仁-皮样品降解得少，这可能是由于巧克力粘土和芒果成分之间的多重相互作用。样品水解和土壤降解后的 FTIR 波段呈现低强度，可能表明材料降解。土壤退化后观察到新的条带，很可能与累积的土壤和条带位移有关，表明样品退化。NMR弛豫数据证实了从其他技术观察到的降解过程，观察所有样品的质子弛豫数据值的变化，比较降解前后的值。可能是由于巧克力粘土和芒果成分之间的多重相互作用。样品水解和土壤降解后的 FTIR 波段呈现低强度，可能表明材料降解。土壤退化后观察到新的条带，很可能与累积的土壤和条带位移有关，表明样品退化。NMR弛豫数据证实了从其他技术观察到的降解过程，观察所有样品的质子弛豫数据值的变化，比较降解前后的值。可能是由于巧克力粘土和芒果成分之间的多重相互作用。样品水解和土壤降解后的 FTIR 波段呈现低强度，可能表明材料降解。土壤退化后观察到新的条带，很可能与累积的土壤和条带位移有关，表明样品退化。NMR弛豫数据证实了从其他技术观察到的降解过程，观察所有样品的质子弛豫数据值的变化，比较降解前后的值。指示样品降解。NMR弛豫数据证实了从其他技术观察到的降解过程，观察所有样品的质子弛豫数据值的变化，比较降解前后的值。指示样品降解。NMR弛豫数据证实了从其他技术观察到的降解过程，观察所有样品的质子弛豫数据值的变化，比较降解前后的值。