Dos Santos Filho Edson Antonio, Luna Carlos Bruno Barreto, Siqueira Danilo Diniz, Ferreira Eduardo da Silva Barbosa, Araújo Edcleide Maria
Department of Materials Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil.
Polymers (Basel). 2021 Dec 30;14(1):136. doi: 10.3390/polym14010136.
Poly(ethylene-octene) grafted with glycidyl methacrylate (POE-g-GMA) and ethylene elastomeric grafted with glycidyl methacrylate (EE-g-GMA) were used as impact modifiers, aiming for tailoring poly(lactic acid) (PLA) properties. POE-g-GMA and EE-g-GMA was used in a proportion of 5; 7.5 and 10%, considering a good balance of properties for PLA. The PLA/POE-g-GMA and PLA/EE-g-GMA blends were processed in a twin-screw extruder and injection molded. The FTIR spectra indicated interactions between the PLA and the modifiers. The 10% addition of EE-g-GMA and POE-g-GMA promoted significant increases in impact strength, with gains of 108% and 140%, respectively. These acted as heterogeneous nucleating agents in the PLA matrix, generating a higher crystallinity degree for the blends. This impacted to keep the thermal deflection temperature (HDT) and Shore D hardness at the same level as PLA. By thermogravimetry (TG), the blends showed increased thermal stability, suggesting a stabilizing effect of the modifiers POE-g-GMA and EE-g-GMA on the PLA matrix. Scanning electron microscopy (SEM) showed dispersed POE-g-GMA and EE-g-GMA particles, as well as the presence of ligand reinforcing the systems interaction. The PLA properties can be tailored and improved by adding small concentrations of POE-g-GMA and EE-g-GMA. In light of this, new environmentally friendly and semi-biodegradable materials can be manufactured for application in the packaging industry.
用甲基丙烯酸缩水甘油酯接枝的聚（乙烯-辛烯）（POE-g-GMA）和用甲基丙烯酸缩水甘油酯接枝的乙烯弹性体（EE-g-GMA）作为抗冲改性剂，旨在调整聚乳酸（PLA）的性能。考虑到PLA性能的良好平衡，POE-g-GMA和EE-g-GMA的使用比例为5%、7.5%和10%。PLA/POE-g-GMA和PLA/EE-g-GMA共混物在双螺杆挤出机中进行加工并注塑成型。傅里叶变换红外光谱（FTIR）表明PLA与改性剂之间存在相互作用。添加10%的EE-g-GMA和POE-g-GMA可显著提高冲击强度，分别提高了108%和140%。它们在PLA基体中充当异质成核剂，使共混物具有更高的结晶度。这影响了热变形温度（HDT）和邵氏D硬度，使其与PLA处于同一水平。通过热重分析（TG），共混物显示出热稳定性提高，表明改性剂POE-g-GMA和EE-g-GMA对PLA基体具有稳定作用。扫描电子显微镜（SEM）显示POE-g-GMA和EE-g-GMA颗粒分散，以及存在增强体系相互作用的配体。通过添加少量的POE-g-GMA和EE-g-GMA，可以调整和改善PLA的性能。据此，可以制造出新型环保且半可生物降解的材料，用于包装行业。
