Toughening of polylactide with epoxy-functionalized methyl methacrylate-butadiene copolymer

Abstract

Glycidyl methacrylate-functionalized methyl methacrylate-butadiene (MB-g-GMA) copolymers were prepared via an emulsion polymerization process. These functionalized copolymers were blended with polylactide (PLA). Dynamic mechanical analysis and differential scanning calorimetry results showed that the addition of MB-g-GMA did not result in a marked change in the glass transition temperature of PLA. With an increase of MB-g-GMA content, the tensile strength of the blends decreased; however, the elongation at break and impact strength increased significantly. From scanning electron micrographs, there was large plastic deformation (shear yielding) in blends subjected to impact tests, which was an important energy-dissipation process and led to a toughened polymer. Rheological investigation demonstrated that there was a significant dependence of viscosity on composition. When the MB-g-GMA content increased, the viscosity began to increase.

Enhancing the PLA Crystallization Rate and Mechanical Properties by Melt Blending with Poly(styrene-butadiene-styrene) Copolymer

“…The glass transition at À80°C arises from the motion of soft polybutadiene segments, whereas the glass transition at 108°C stems from hard PS segments. The glass transition of PLA was observed at 70°C, which is consistent with findings reported in the literature [27] . The binary blends with 20 to 50 wt.% SBS contents exhibited two distinct tan d peaks corresponding to the PLA-rich and SBS-rich phases, respectively.…”

Modification of epoxidized natural rubber as a PLA toughening agent

“…The blends of PLA/ENR8‐PLA5 at 1 phr, had a rough surface, including a fibrous surface [Figure (c)]. This supported the highest toughness and percentage elongation being under these conditions . However, as the content of ENR8‐PLA5 increased to 3 and 5 phr, the copolymers agglomerated.…”

Effect of mixing poly(lactic acid) with glycidyl methacrylate grafted poly(ethylene octene) on optical and mechanical properties of the blown films

“…The end hydroxyl and/or carboxyl groups of PLA can react with epoxy groups via nucleophilic substitution under appropriate conditions. Many authors have used the flexibilizers with reactive functional groups for toughening PLA, such as poly(ethylene‐co‐glycidyl methacrylate) (EGMA) , glycidyl methacrylate‐functionalized methyl methacrylate‐butyl acrylate (ACR‐ g ‐GMA) , epoxy‐functionalized grafted acrylonitrile‐butadiene‐styrene (ABS‐ g ‐GMA) , and glycidyl methacrylate‐functionalized methyl methacrylate‐butadiene copolymers (MB‐ g ‐GMA) . Lin and Shimizu explore to use of a reactive styrene‐acrylonitrile‐glycidyl methacrylate (SAN‐GMA) copolymers as a compatibilizer for PLA/ABS blends.…”