Eriyik harmanlama ile polilaktik asit özelliklerinin iyileştirilmesi

PPoly (lactic acid) (PLA) is part of the aliphatic polyester family and consists of α-hydroxy acids. In addition, it is a biodegradable polymer that can also be used in industrial areas, obtained from the fermentation of renewable resources such as corn, wheat, potatoes, and starch. It is a biodegradable, biocompatible material and is a high-modulus thermoplastic polymer with high strength, available from renewable resources. The biodegradable nature of PLA makes it a sustainable, promising, and popular raw material for many fields from packaging to the textile industry. The wide application areas are due to the processability of PLA. Because PLA is a rigid polymer, its flexibility is low and its elongation at break values is generally low. This is one of the most important problems of PLA-based products. Mechanical properties of PLA, such as tensile strength and elastic modulus, limit its use in applications. It is also brittle below the glass transition temperature (Tg), which is in the range of 50-60 °C. The brittleness of PLA is its biggest and most important disadvantage. PLA has low abrasion resistance and hydrolysis resistance because it is a hard and brittle material. To overcome these questions, it will be blended with different polymers and compatibilizers and compared with both traditional and modern production methods and their use in the industrial field will be examined. In order to modify the thermal, morphological, and mechanical properties of PLA, it is blended with different polymers. To this disadvantage of PLA, it is aimed to eliminate the weak properties by preparing blends with polymers such as PET and PBT. Thus, new raw materials can be provided to many sectors, especially textile, automotive and electronic products, by preparing materials that are biodegradable, environmentally friendly, and with better p, performance properties. In this study; PLA/PBT and PLA/PET blends prepared to contain 5%, 10%, and 15% PBT by weight and PET in the same proportions, maleic anhydride grafted ethylene (EBA-g-MAH) as a compatibilizer, random ethylene-methyl acrylate-glycidyl methacrylate (Production was carried out in a twin screw extruder using GMA) terpolymer and Joncryl as chain extender. PLA/PBT and PLA/PET blends blended in different ratios were produced without compatibilizer, without compatibilizer and by adding a chain extender, and the rheological, physical, mechanical, and thermal properties of these blends were characterized.For the characterization of the PLA/PBT and PLA/PET blends created, first rheological, physical, mechanical, and thermal analyzes of neat PLA, PBT, and PET polymers and then PLA blends performed time sweep test was performed as a rheological test. Densities of polymers and blends, shore D hardness, tests and mold shrinkage properties were analyzed for physical characterization. For mechanical tests, tensile strength, tensile strength, elastic modulus and Izod impact strength properties were examined.In the thermal analysis part, HDT/VICAT tests of neat polymers were made and it was observed how the use of a compatibilizer and chain extender affected the thermal properties. It was also observed that blend samples containing 10% PBT, and 10% PET showed the highest mechanical properties. In all analysis test results, the properties of neat PLA, PBT, and PET polymers and PLA blends change when compatibilizer or chain extender is used were analyzed. It is seen that repeating the extrusion process for the second time in PLA/PBT and PLA/PET blends prepared using compatibilizers increases the mechanical properties positively. For this reason, in the comparison of the mechanical properties of the samples extruded for the second time, the values of the samples produced were compared and it was thought that the samples that were extruded for the second time were blended more efficiently. mostly performance products were used and comments were made on them. It was concluded that when the double extruder process is performed on samples without compatibilizer, the molecular weight decreases due to repeated heat treatment, the mechanical properties are reduced due to degradation, and yet it is better in the samples without compatibilizer, so the use of compatibilizer and additionally the mechanical properties are further improved.