Rigid molecular chains trapped reactive elastomers for high performance PLLA composites with excellent tough-strength balance

Qu, Yingding; Hong, Jiangtao; Chen, Yihang; Ling, Xiayan; Wu, Jiali; Wang, Hengti; Li, Yongjin

doi:10.1016/j.compositesb.2023.110619

Cited by 9 publications

(4 citation statements)

References 56 publications

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“…It is widely accepted that rheological tests can provide valuable insights into the phase morphology and microstructure of multiphase polymeric systems. Specifically, the results of linear viscoelastic measurements at low-frequency regions are highly sensitive to the level of interfacial interactions between the blend components as well as the dispersion state of modifier domains in the blends . In this study, linear viscoelastic measurements were conducted at low frequencies to examine the interfacial interactions and dispersion states of modifier domains in PLA/RCS blends.…”

Section: Resultsmentioning

confidence: 99%

“…Taking the place of coupling reactions at the interfacial region between RCS particles and the PLA matrix, leading to the grafting of PLA chains onto the rubbery particles, significantly improves the dispersion state of the rubber particles in the matrix. This can reduce the relaxation and mobility of copolymer chains at the interface, contributing to the solid-like behavior observed even at 5 wt % RCS particles. , The increased level of interfacial interactions with the PLA matrix at higher loadings of rubbery particles reduced interparticle distance, and the formation of a network-like structure of rubbery domains in the PLA matrix likely contributed to the reduced slope of G ′ vs frequency curves at higher frequencies for the PLA-80 blend compared to blends with lower rubber contents.…”

Section: Resultsmentioning

confidence: 99%

“…Specifically, the results of linear viscoelastic measurements at low-frequency regions are highly sensitive to the level of interfacial interactions between the blend components as well as the dispersion state of modifier domains in the blends. 60 In this study, linear viscoelastic measurements were conducted at low frequencies to examine the interfacial interactions and dispersion states of modifier domains in PLA/RCS blends. The storage modulus (G′) data for neat PLA and PLA/RCS blends of different RCS particle contents revealed interesting trends (Figure S5).…”

Section: Acs Appliedmentioning

confidence: 99%

“…This can reduce the relaxation and mobility of copolymer chains at the interface, contributing to the solid-like behavior observed even at 5 wt % RCS particles. 60,61 The increased level of interfacial interactions with the PLA matrix at higher loadings of rubbery particles reduced interparticle distance, and the formation of a networklike structure of rubbery domains in the PLA matrix likely contributed to the reduced slope of G′ vs frequency curves at higher frequencies for the PLA-80 blend compared to blends with lower rubber contents.…”

Section: Acs Appliedmentioning

confidence: 99%

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Design and Synthesis of Polystyrene-Occluded Reactive Core–Shell Particles of Natural Rubber to Balance Stiffness and Toughness in Poly(lactic acid)

Alizadeh,

Habibi,

Razavi Aghjeh

et al. 2024

ACS Appl. Polym. Mater.

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Rubber toughening of poly(lactic acid), PLA, particularly with biobased natural rubber (NR) to address its inherent brittleness, is always at the cost of reducing stiffness and tensile strength. In this work, reactive core−shell particles (RCS particles) of NR with occluded rigid polystyrene (PS) nanodomains inside the NR particles and surface-grafted glycidyl methacrylatemethyl methacrylate copolymer (GMA-co-MMA) were designed and successfully synthesized via a two-step seeded emulsion polymerization technique to balance the stiffness and toughness of the PLA/NR blends. Incorporation of RCS particles resulted in a significant improvement in the impact toughness of PLA. The maximum impact strength of 365 J/m (28-fold increment relative to PLA) was achieved for the PLA/RCS 80/20 blend, while the tensile strength preserved 86% and decrement in Young's modulus was less than 20%, representative of a notable "stiff ness−toughness balance" in these systems. This substantial increase in impact toughness was ascribed to the high level of interfacial adhesion between the RCS particles and PLA matrix and consequently activation of different toughening micromechanisms, particularly massive shear yielding in the entire PLA matrix. On the other hand, both the retained tensile strength and elastic modulus were attributed to the inclusion of rigid PS nanodomains within the NR particles. This innovative strategy, which effectively achieves a balance between stiffness and toughness in high-performance biodegradable plastics based on PLA, represents a significant advancement in the production of alternatives to engineering plastics, especially for use in automotive applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Acs Appliedmentioning

confidence: 99%

Section: Acs Appliedmentioning

confidence: 99%

See 2 more Smart Citations

Design and Synthesis of Polystyrene-Occluded Reactive Core–Shell Particles of Natural Rubber to Balance Stiffness and Toughness in Poly(lactic acid)

Alizadeh,

Habibi,

Razavi Aghjeh

et al. 2024

ACS Appl. Polym. Mater.

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Optimizing the injection molding process for thermally and electrically conductive, carbon fiber and carbon nanotube‐reinforced poly(lactic acid) hybrid composites with enhanced mechanical properties

Virág,

Tóth,

Mészáros

et al. 2024

J of Applied Polymer Sci

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We produced poly(lactic acid) (PLA) matrix carbon fiber and carbon nanotube‐reinforced hybrid composites with enhanced thermal conductivity (0.48–0.59 W/mK) and electrical conductivity (0.35–0.97 S/cm). The conductive fillers greatly decreased the toughness, which was compensated with oligomeric lactic acid (OLA). Since fillers and plasticizers greatly alter the flow and thermal properties of the material as well, it was necessary to optimize several parameters of the injection molding process that were predetermined based on theoretical considerations. Based on oscillatory shear rheometry, we explored the rheological behavior of the materials in a wide temperature and shear rate range for the optimum injection molding temperatures, injection volume rates. We showed that by adding 15 wt% OLA as a plasticizer to the composites, the optimal processing temperature decreased by 45–135°C. This remarkable change illustrates the need for rheological studies of PLA compounds. The injection molded hybrid composites containing 5% oligomeric lactic had a tensile strength, modulus of elasticity, and work of fracture higher by 41%, 10%, and 150%, respectively, compared to samples without OLA.

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A Novel Functional Compatibilization Strategy for Poly(lactic acid) and Poly(butylene adipate-co-butylene terephthalate) Blends to Achieve a Stable Co-continuous Structure and Excellent Antibacterial Performance

Sun,

Long,

Peng

et al. 2024

Chemical Engineering Journal

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Rigid molecular chains trapped reactive elastomers for high performance PLLA composites with excellent tough-strength balance

Cited by 9 publications

References 56 publications

Design and Synthesis of Polystyrene-Occluded Reactive Core–Shell Particles of Natural Rubber to Balance Stiffness and Toughness in Poly(lactic acid)

Design and Synthesis of Polystyrene-Occluded Reactive Core–Shell Particles of Natural Rubber to Balance Stiffness and Toughness in Poly(lactic acid)

Optimizing the injection molding process for thermally and electrically conductive, carbon fiber and carbon nanotube‐reinforced poly(lactic acid) hybrid composites with enhanced mechanical properties

A Novel Functional Compatibilization Strategy for Poly(lactic acid) and Poly(butylene adipate-co-butylene terephthalate) Blends to Achieve a Stable Co-continuous Structure and Excellent Antibacterial Performance

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