Complete stereo-complexation of enantiomeric polylactides for scalable continuous production

Pan, Gangwei; Xu, Helan; Mu, Bingnan; Ma, Bomou; Yang, Jing; Yang, Yiqi

doi:10.1016/j.cej.2017.07.068

Cited by 41 publications

(18 citation statements)

References 49 publications

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“…However, fabrication of scPLA films by melt processing is interesting, because of its possible use in industrial-scale applications. Specimens of scPLA have been prepared by injection [18] and extrusion [19,20]. For these purposes, PLLA and PDLA were melt blended within a screw barrel.…”

Section: Introductionmentioning

confidence: 99%

Influence of Chain-Extension Reaction on Stereocomplexation, Mechanical Properties and Heat Resistance of Compressed Stereocomplex-Polylactide Bioplastic Films

Baimark

Kittipoom

2018

Polymers

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Stereocomplex polylactide (scPLA) films were prepared by melt blending of poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) with and without an epoxy-based chain extender before compression molding. The obtained scPLA films were characterized through differential scanning calorimetry, X-ray diffractometry (XRD), tensile testing and dimensional stability to heat. XRD patterns revealed that all the scPLA films had only stereocomplex crystallites. The obtained results showed that the chain-extension reaction improved mechanical properties of the scPLA films, however, it suppressed stereocomplexation and heat resistance.

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Section: Introductionmentioning

confidence: 99%

Influence of Chain-Extension Reaction on Stereocomplexation, Mechanical Properties and Heat Resistance of Compressed Stereocomplex-Polylactide Bioplastic Films

Baimark

Kittipoom

2018

Polymers

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“…In other words, both the unannealed and annealed blends achieve the optimum toughness at 20 wt % EVM‐GMA content. However, the elongation at break of the blends is greatly decreased after annealing, which is attributed to the significant increase in matrix crystallinity . Despite this, the annealed L/EG20‐230 blend still possesses excellent toughness, with the elongation at break of 62% and the impact strength of 64.2 kJ m −2 .…”

Section: Resultsmentioning

confidence: 99%

Super‐Toughened Heat‐Resistant Poly(lactic acid) Alloys By Tailoring the Phase Morphology and the Crystallization Behaviors

Yang

et al. 2020

Journal of Polymer Science

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The interfacial grafting copolymerization and the compatibility between poly(lactic acid) (PLA) and ethylene-vinyl acetate-glycidyl methacrylate elastomer (EVM-GMA) are adjusted by varying the blending temperatures. High temperature is favored to the grafting reaction between epoxy groups of the EVM-GMA and terminal groups of the PLA, resulting in better compatibility between the two components. Taking PLA/EVM-GMA (80/20) blend as an example, an increase in blending temperature from 175 to 230 C led to a 42.8% reduction in EVM-GMA particle size, and consequently 137.8% and 52.6% increases in elongation at break (Eb) and notched impact strength (NIS), respectively. In comparison, the Eb and NIS of PLA/EVM blends without any interfacial reaction deteriorated dramatically due to thermal degradation of the PLA at high(er) temperatures. Furthermore, the PLA/EVM-GMA blend prepared at 230 C possesses both excellent toughness (Eb > 60%, NIS > 60 kJ m −2 ) and high heat deflection temperature (>90 C) after annealing at 100 C. This work provides a new approach in designing highperformance biobased materials which may broaden the application range of PLA in engineering areas.Although reactive blending with elastomers has been reported as an effective method for toughening of PLA, the effect of blending temperature, that is, the extent of in situ grafting reactions on the mechanical properties of PLA/elastomer blends has rarely been studied. The higher the blending temperature is, the higher reaction extent and compatibilization between PLA and elastomer. However, it may also lead to thermal degradation of PLA matrix, which is not conducive to the final mechanical performances (e.g., tensile strength).Additional supporting information may be found in the online version of this article.

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“…Because of its origin from renewable resources (such as corn, starch) and biodegradability, it has attracted more attention (Zhang et al, 2015;Boonluksiri et al, 2020). In recent years, research interest in developing durable PLA materials used in automobiles, electronics, and other fields has increased (Pan et al, 2017). In addition, PLA has become one of the most popular polymers for the new generation of biomedical products due to its biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermal and Antibacterial Properties of Stereo-Complexed Polylactide Fibers Doped With Nano-Silver

Zhao

Yang

et al. 2022

Front. Mater.

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Stereo-complexed polylactide (sc-PLA) fibers with excellent heat resistance and antibacterial properties were prepared by electrospinning. Due to poor heat resistance, common poly(L-lactide) (PLLA) fibers have poor dimensional stability at high temperatures and cannot be sterilized and recycled as a medical filter material. In this research, PLLA/poly(D-lactide) (PDLA) blends doped with silver nanoparticles (AgNPs) were electrospun to obtain the sc-PLA fibers. The effect of thermal induction temperature on the crystalline structure and thermal properties of sc-PLA fibers was investigated. Moreover, the influence of the addition amount of AgNPs on the crystal structure of sc-PLA fibers was studied, and the antibacterial properties of the sc-PLA fibers with different addition amounts of AgNPs were analyzed. The thermal induction is beneficial to the formation of stereo-complexed crystals of sc-PLA fibers, and finally completely stereo-complexed PLA fibers were obtained. The melting temperature of the completely stereo-complexed PLA fibers was 50°C higher than that of the PLLA fibers; therefore, the sc-PLA fibers have better heat resistance. The addition of AgNPs was conducive to the formation of stereo-complexed crystals of sc-PLA fibers. In addition, the antibacterial rate of sc-PLA fibers against E. coli and S. aureus was 99.99 ± 0.01% when the addition amount of AgNPs was only 0.15 wt%. The fiber membrane obtained in this experiment can be used as a reusable filter material, and the sc-PLA fiber membrane has broad application prospects in the biomedical field.

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Complete stereo-complexation of enantiomeric polylactides for scalable continuous production

Cited by 41 publications

References 49 publications

Influence of Chain-Extension Reaction on Stereocomplexation, Mechanical Properties and Heat Resistance of Compressed Stereocomplex-Polylactide Bioplastic Films

Influence of Chain-Extension Reaction on Stereocomplexation, Mechanical Properties and Heat Resistance of Compressed Stereocomplex-Polylactide Bioplastic Films

Super‐Toughened Heat‐Resistant Poly(lactic acid) Alloys By Tailoring the Phase Morphology and the Crystallization Behaviors

Enhanced Thermal and Antibacterial Properties of Stereo-Complexed Polylactide Fibers Doped With Nano-Silver

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