Influence of methyl methacrylate‐butadiene‐styrene copolymer on plasticized polylactide blown films

Abstract

Polylactide (PLA) was first toughened with methyl methacrylate‐butadiene‐styrene (MBS) copolymer. Then the toughened PLA was further blended with diethylene glycol monobutyl ether adipate (DGBEA) using a twin‐screw extruder. Finally, the extruded samples were blown using the blown film technique. The PLA/DGBEA/MBS blends were characterized by dynamic rheometer, dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC). Rhelological investigation demonstrated that there was a significantly dependence of viscosity on composition. DMA results displayed that the PLA/DGBEA/MBS blends showed a single peak, which suggested that PLA and the shell of MBS be compatible. So, DGBEA could act as a plasticizer and improve the miscibility of PLA/MBS blends. The crystallization morphology, mechanical properties, optical properties, the morphology of the tear‐fracture surfaces, and enzymatic degradation of the PLA/DGBEA/MBS films were further studied. The Maltese cross pattern phenomenon weakens and the spherulite size becomes smaller from the observation of the polarized microscope. With an increase of MBS content from 3% to 12%, the tensile strength of the films decreased from 38.2/37.5 MPa (MD/TD) to 25.2/26.4 MPa (MD/TD), however, the elongation at break increased significantly from 72.3/83.1% (MD/TD) to 289.5/286.8% (MD/TD), which indicated the toughening effects of the MBS on PLA. POLYM. ENG. SCI., 58:E4–E13, 2018. © 2017 Society of Plastics Engineers

Enhanced Mechanical Properties of Polylactic Acid/Poly(Butylene Adipate-co-Terephthalate) Modified with Maleic Anhydride

“…The MAH concentration did not significantly alter the tensile modulus, tensile strength, or elongation, which was consistent with the results reported previously [ 64 ]. However, compared with the composites with 1.0 and 1.5 phr of MAH, PLA/PBAT-g-MAH_0.5 exhibited a substantial decrease in the elongation at break, likely attributed to the β-scission reactions in the PLA main chain caused by an excess of DCP relative to MAH [ 65 , 66 , 67 ]. Among samples with the same MAH concentration, (PLA/PBAT)-g-MAH exhibited marginally higher mechanical properties than those of PLA-g-MAH/PBAT and PLA/PBAT-g-MAH.…”

Modification of reactive PB‐g‐SAG core–shell particles to achieve higher toughening ability for brittle polylactide

“…At present, commercial core–shell tougheners, such as ABS, MBS, ACR, and silica core–shell particles have been used as impact modifiers of PLA. [ 24–30 ]…”

“…At present, commercial core-shell tougheners, such as ABS, MBS, ACR, and silica coreshell particles have been used as impact modifiers of PLA. [24][25][26][27][28][29][30] Acrylonitrile-butadiene-styrene (ABS) toughener contains a crosslinked polybutadiene (PB) particle as rubbery core and grafted styrene-acrylonitrile copolymer (SAN) as the shell. The toughening ability for the coreshell structured ABS particles mainly depends on the soft PB core phase.…”