Reactive compatibilization of poly(lactic acid)/polyethylene octene copolymer blends with ethylene-glycidyl methacrylate copolymer

Abstract

A melt blending process was used to prepare poly(lactic acid) (PLA)/metallocene catalyzed polyethylene octene copolymer (POE) blends in order to toughen PLA. A commercialized ethylene-glycidyl methacrylate copolymer (EGMA) was applied as a compatibilizer to improve the dispersion and interaction of dispersed POE to the PLA matrix. The results showed that chemical interaction seems to be the driving force for reinforcing the compatibility between PLA and POE, and also the dispersion of POE into the PLA matrix domain. With the incorporation of 10 phr EGMA in the blends, POE was welldispersed at a sub-micrometer scale within the PLA matrix, indicating better interfacial compatibility between PLA and POE. The impact strength test revealed that POE could signifi cantly toughen PLA containing EGMA in the blends, up to no-break level regarding unnotched Izod impact strength at 10 phr EGMA content. With the increase of EGMA content, the blends showed lower tensile strength, but higher elongation at break due to the elastomeric characteristics of EGMA. When 10 phr of the EGMA was incorporated into the blends, its elongation at break reached 54.5 % , 10.7 times that of neat PLA at 5.1 % . The melt viscosity of compatibilized blends containing 10 phr EGMA increased by more than 50 % in comparison with the non-compatibilized blend, which implied a good interfacial interaction between the PLA and POE interface.

Characterization of biofilms developed from alginate extracted from Padina sp. incorporated with calcium chloride (CaCl2)

“…The SEM image show that the surface of control biofilm was not smooth because of the eradication of sodium alginate particles which are not completely soluble in the solvent. In fact, comparatively, only control biofilm, without CaCl2 showed irregular droplets in the figure [33]. Next, the biofilms with 0.02g CaCl2,no significant differences could be seen in terms of morphology on the two images.…”

Production of Eco-Sustainable Materials: Compatibilizing Action in Poly (Lactic Acid)/High-Density Biopolyethylene Bioblends

“…PLA/BioPE presented an elongation at break of 6.9%, bioblends compatibilized with POE-g-GMA, EE-g-GMA, PE-g-MA, PE-g-AA and SEBS-g-MA presented values of 9%, 8.7%, 8.3%, 8% and 10%, respectively. The increase in this property is related to the improvement in the stress transfer between the matrix and the dispersed phase of studied systems, due to the improvement in the interactions among the chemical groups present in the compatibilizers, showing its effectiveness [40,41]. These results corroborate those presented later on for impact strength, where the addition of POE-g-GMA, EE-g-GMA and SEBS-g-MA presented the best impact strengths, as well as higher elongations at break.…”

Preparation and properties of thermally conductive PLA/PA 610 biomass composites

“…350 C mainly corresponded to the degradation of PLA, as reported in our previous study. 20 In the second stage, it showed the degradation temperature at ca. 450 C, which was attributed to the contribution from PA 610.…”