Preparation and Properties of Plasticized Poly(lactic acid) Films

Citations Over TimeTop 10% of 2005 papers

Abstract

Poly(lactic acid), PLA, was blended with monomeric and oligomeric plasticizers in order to enhance its flexibility and thereby overcome its inherent problem of brittleness. Differential scanning calorimetry, dynamic mechanical analysis, transmission electron microscopy, and tensile testing were used to investigate the properties of the blends. Monomeric plasticizers, such as tributyl citrate, TbC, and diethyl bishydroxymethyl malonate, DBM, drastically decreased the T(g) of PLA, but the blends showed no morphological stability over time since rapid cold crystallization caused a size reduction of the amorphous domains in PLA. Consequently, the ability of PLA to accommodate the plasticizer diminished with the increase in crystallinity and migration of the plasticizer occurred. Increasing the molecular weight of the plasticizers by synthesizing oligoesters and oligoesteramides resulted in blends that displayed T(g) depressions slightly smaller than with the monomeric plasticizers. The compatibility with PLA was dependent on the molecular weight of the oligomers and on the presence or not of polar amide groups that were able to positively interact with the PLA chains. Aging the materials at ambient temperature revealed that the enhanced flexibility as well as the morphological stability of the films plasticized with the oligomers could be maintained as a result of the higher molecular weight and the polar interactions with PLA.

Related Papers

• → Recent Attempts in the Design of Efficient PVC Plasticizers with Reduced Migration(2021)124 cited
• → Molecular Mechanism of Plasticizer Exudation from Polyvinyl Chloride(2023)24 cited
• → Impact of the nature and concentration of plasticizers on the ability of PVC to sorb drug(2015)36 cited
• → Solutions to reduce release behavior of plasticizers out of PVC-made equipments: binary blends of plasticizers and thermal treatment(2009)14 cited
• Susquehanna Chorale Spring Concert "Roots and Wings"(2017)