Highly‐modified polylactide transparent blends with better heat‐resistance, melt strength, toughness and stiffness balance due to the compatibilization and chain extender effects of methacrylate<scp>‐</scp>co<scp>‐</scp>glycidyl methacrylate copolymer

Jiang, Yujun; Li, Zhaokun; Song, Shixin; Sun, Shulin; Li, Quanming

doi:10.1002/app.50124

Cited by 16 publications

(17 citation statements)

References 37 publications

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“…Similar compatibilization reactions have been widely used for PLA toughening with GMA‐functionalized tougheners. [ 23–25,30,31,35 ] The chemical reactions between the epoxy groups and carboxyl/hydroxyl groups also have been proved. [ 23,31,36 ]…”

Section: Resultsmentioning

confidence: 99%

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

Hao

Zheng

Sun

2022

Polymer Engineering & Sci

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Core-shell structured particles have been used to toughen brittle polylactide (PLA) extensively. In this research, reactive core-shell (RCS) particles with polybutadiene (PB) as core and the terpolymer styrene-acrylonitrile-glycidyl methacrylate as shell were prepared to improve the toughening ability of RCS for PLA. The tert-dodecyl mercaptan (TDDM) content was varied during polymerization and higher TDDM concentrations induced lower grafting and cross-linking of the PB phase, which significantly influenced the dispersed phase morphology and toughness of RCS toughened PLA blends. With the increase of TDDM content, the phase morphology of RCS changed from uniform dispersion, net-like structure to an agglomeration pattern. The impact strength of PLA blends increased with TDDM content and reached 922 J/m for the PLA/RCS-T5 (TDDM: 1.18 wt%), which was 30 times higher than pristine PLA and $3 times than PLA/RCS-T0 blend. Higher TDDM contents decreased toughening efficiency. Appropriate TDDM contents decreased the glass transition temperature (T g ) and cross-linking degree of RCS particles which enhanced the cavitation ability of the PB core phase and promoted the shear yielding of PLA matrix. The modification effect of TDDM solves the problem of insufficient toughening ability of core-shell particles. Under the same toughener content, the modified RCS particles make the PLA blend achieve super toughness.

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Section: Resultsmentioning

confidence: 99%

“…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 ]…”

Section: Introductionmentioning

confidence: 99%

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

Hao

Zheng

Sun

2022

Polymer Engineering & Sci

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“…Core-shell modifiers with silicone copolymer as the core and methacrylate-co-glycidyl methacrylate (GM) copolymer (PASi-g-PMMA) as the shell, can be used to improve the toughness of PLA and thus to reduce its brittleness [ 112 ]. The GM groups played the double role of compatibilizer and chain extender, which not only improved the interfacial adhesion between the PLA and PASi-g-PMMA particles, but also increased the molecular weight and chain entanglement of PLA.…”

Section: Molecular Weight Increase Of Plamentioning

confidence: 99%

Poly(lactic Acid): A Versatile Biobased Polymer for the Future with Multifunctional Properties—From Monomer Synthesis, Polymerization Techniques and Molecular Weight Increase to PLA Applications

et al. 2021

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Environmental problems, such as global warming and plastic pollution have forced researchers to investigate alternatives for conventional plastics. Poly(lactic acid) (PLA), one of the well-known eco-friendly biodegradables and biobased polyesters, has been studied extensively and is considered to be a promising substitute to petroleum-based polymers. This review gives an inclusive overview of the current research of lactic acid and lactide dimer techniques along with the production of PLA from its monomers. Melt polycondensation as well as ring opening polymerization techniques are discussed, and the effect of various catalysts and polymerization conditions is thoroughly presented. Reaction mechanisms are also reviewed. However, due to the competitive decomposition reactions, in the most cases low or medium molecular weight (MW) of PLA, not exceeding 20,000–50,000 g/mol, are prepared. For this reason, additional procedures such as solid state polycondensation (SSP) and chain extension (CE) reaching MW ranging from 80,000 up to 250,000 g/mol are extensively investigated here. Lastly, numerous practical applications of PLA in various fields of industry, technical challenges and limitations of PLA use as well as its future perspectives are also reported in this review.

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“…As shown in subplot a, for EGDA (Case 9), the highest tensile modulus results through this coformulation design. Crosslinkers allow creating 3D networks of chemical bonds in the polymer structure that are responsible for increasing the resistance but also the rigidity, which can compromise the capacity to withstand stress [103][104][105][106]. Only upon careful selection of the crosslinker, one can overcome this issue as clear from the high yellow bars in both Figure 7a,b.…”

Section: Analysis Of Mechanical Propertiesmentioning

confidence: 99%

Combining Chromatographic, Rheological, and Mechanical Analysis to Study the Manufacturing Potential of Acrylic Blends into Polyacrylic Casts

et al. 2021

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Polyacrylics have been considered for a broad range of material applications, including coatings, dental applications, and adhesives. In this experimental study, the casting potential of a group of (co)monomers belonging to the acrylic family has been explored to enable a more sustainable use of these polymer materials in the medical and veterinary science field. The individual contributions of each comonomer have been analyzed, the reaction conversion has been studied via gas chromatography (GC), the rheological behavior has been characterized via stress-controlled measurements, and the final mechanical properties have been obtained from tensile, flexure, and impact tests. The GC results allow assessing the pot life and thus the working window of the casting process. For the rheological measurements, which start from low-viscous mixtures, a novel protocol has been introduced to obtain accurate absolute data. The rheological data reflect the time dependencies of the GC data but facilitate a more direct link with the macroscopic material data. Specifically, the steep increase in the viscosity with increasing reaction time for the methyl methacrylate (MMA)/ethylene glycol dimethyl methacrylate (EGDMA) case (2% crosslinker) allows maximizing several mechanical properties: the tensile/flexure modulus, the tensile/flexure stress at break, and the impact strength. This opens the pathway to more dedicated chemistry design for corrosion casting and polyacrylic material design in general.

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Highly‐modified polylactide transparent blends with better heat‐resistance, melt strength, toughness and stiffness balance due to the compatibilization and chain extender effects of methacrylate‐co‐glycidyl methacrylate copolymer

Cited by 16 publications

References 37 publications

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

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

Poly(lactic Acid): A Versatile Biobased Polymer for the Future with Multifunctional Properties—From Monomer Synthesis, Polymerization Techniques and Molecular Weight Increase to PLA Applications

Combining Chromatographic, Rheological, and Mechanical Analysis to Study the Manufacturing Potential of Acrylic Blends into Polyacrylic Casts

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