Control of Biodegradability Under Composting Conditions and Physical Performance of Poly (Lactic Acid) Based Materials Modified with Phenolic-Free Rosin Resin

Abstract

Biodegradable materials based on poly (lactic acid) (PLA) and a phenolic free modified rosin resin were obtained and studied to control the biodegradability under composting conditions of the materials. The resin was blended in concentrations of 1, 3, 5, 10, and 15 parts per hundred (phr) of base polymer using industrial plastic processing techniques. Additionally, to study the effect of the resin on the compatibility of the PLA, the physical performance, water absorption, mechanical behavior, thermal stability, and microstructure of the materials were assessed. The resin incorporation decreased the resistance to thermal degradation of the resultant material, and the composting disintegration rate was slowed down with the increasing content of the resin. The water diffusion was delayed, and the diffusion and corrected diffusion coefficients decreased with the rising content of UP. The mechanical properties tend to decrease while a saturation effect was observed for contents higher than 3 phr of resin. The optimal amount of resin that can be added to achieve good interaction with PLA matrix, complete miscibility, and good material cohesion is 3 phr.

Influence of phenolic free modified rosin resin on the thermomechanical behavior of poly (lactic acid) having different crystallinities and molecular weights

“…UP resin derivative was cracked into small fragments (average size 2 mm in diameter). The UP resin grains were blended with the different PLA grades in a concentration of 3 parts per hundred resins (phr), which was previously found to be the maximum quantity of UP resin e cient to enhance PLA performance before saturation [17]. Formulation labeling is indicated in Table 2.…”

Hyperbranched polyglycidol grafted with rosin by a natural catalyst under ultrasound: Synthesis, characterization and antimicrobial activity

“…Therefore, rosin fraction can be encompassed in polymers as side chains or backbones by functionalizing the carboxyl group of rosin acids. [14][15][16][17][18][19] Several authors have embedded rosin with various compounds such as polyethylenglycol (PEG) to obtain PEGrosin derivative for water soluble rosin flux, 20 cellulose nanofiber as a reinforcing and co-antimicrobial agents in polylactic acid/chitosan composite film for food packaging 21 and degradable rosin-ester-caprolactone graft copolymers. 22 Most of the processes applied to enhance rosin grafting to other compounds used chemicals and solvents, while ultrasonic waves considering as "green chemistry" offers not only a good alternative to these toxic elements, but also lowers energy use, speeds up the polymerization reaction as an external catalyst and enhanced product selectivity.…”

The Effect of Catechins and Nanochitosan on Reducing Bacterial Colonies and Material Performance in Packaging Films Based on Pla/PCL Blend

“…PLA is highly transparent but rigid with low permeability, while PCL lacks transparency but exhibits flexibility and strength De la Rosa-Ramírez et al (2023). Combining these two polymers yields a composite that addresses the shortcomings of each component.…”