PLA with high elongation induced by multi-branched poly(ethylene imine) (mPEI) containing poly(l-lactic acid) (PLLA) terminals

Khamsarn, Thammanoon; Supthanyakul, Raksit; Matsumoto, Masahiro; Chirachanchai, Suwabun

doi:10.1016/j.polymer.2016.08.038

Cited by 17 publications

(13 citation statements)

References 19 publications

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“…The brittleness does hinder its applications ranging from packaging materials to medical implants . To improve the elongation at break and impact strength, various modifier polymers (e.g., rubber or other polymers with excellent flexibility) have been widely employed to blend with PLLA . The binary blend, however, always undergoes phase separation because of weak interfacial interaction and poor miscibility between PLLA and other polymers.…”

Section: Methodsmentioning

confidence: 99%

“…[3,4] To improve the elongation at break and impact strength, various modifier polymers (e.g., rubber or other polymers with excellent flexibility) have been widely employed to blend with PLLA. [5][6][7][8][9][10][11][12][13][14][15][16][17][18] The binary blend, however, always undergoes phase separation because of weak interfacial interaction and poor miscibility between PLLA and other polymers. Therefore, compatibilizers have been introduced to the blend system.…”

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confidence: 99%

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Fabrication of PLLA with High Ductility and Transparence by Blending with Tiny Amount of PVDF and Compatibilizers

Zhang

et al. 2019

Macro Materials & Eng

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Poly(L‐lactic acid) (PLLA) with high ductility and transparence is fabricated by a blending tiny amount of polyvinylidene fluoride (PVDF) and reactive comb compatibilizers (RCC). Upon blending, the reaction between terminal carboxyl groups in PLLA and expoxy groups in RCC produces graft copolymer (PLLA‐g‐poly(methyl methacrylate) (PMMA)), which locates at the PVDF/PLLA interface due to the balanced stress on two sides. On the one hand, the PVDF domain size decreases remarkably with the help of compatibilization, accounting for the excellent transparence. On the other hand, the interface is enhanced significantly, resulting in an activated PLLA layer surrounding PVDF domains. The thickness exhibits higher magnitude because of the high molecular weight of grafted PLLA (relative to premade compatibilizers). During uniaxial tension, the activated PLLA layers (in addition to PVDF) can cause effective energy absorption and dissipation in the case of percolation of them, which is the reason for the better ductility. These results provide an efficient strategy to improve the ductility and transparence simultaneously.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Fabrication of PLLA with High Ductility and Transparence by Blending with Tiny Amount of PVDF and Compatibilizers

Zhang

et al. 2019

Macro Materials & Eng

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“…One was the interfacial interchain force between PLA chains with heterogenous chains [35,36,39,45–48] . The other criterion was what structures of heterochains could entangle with PLA chains [31,49,50] …”

Section: Physical Blending Of Pla With Linear Polymersmentioning

confidence: 99%

The Role of Interchain Force and/or Chain Entanglement in the Melt Strength and Ductility of PLA‐Based Materials

Chen

Sun

et al. 2023

Chemistry An Asian Journal

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As an eco‐friendly material, PLA was a desirable alternative to polyethylene and polypropylene films due to its biodegradability. The preferable melt strength of PLA‐based materials was a key factor in ensuring its processing using extrusion blow. This paper focuses on the influence of interchain force and/or chain entanglement on the melt strength and ductility of PLA‐based materials in recent years. In addition, the preparation of PLA‐based materials via physical blending or reactive processing was also summarized. The blending of PLA with a flexible heteropolymer, driven by the interchain force and/or chain entanglements, were characterized as a practicable method for toughening PLA‐based materials. Also, the restructuring of PLA chains, by branching based on chain entanglement, was suitable for increasing chain entanglements in PLA matrix, yielding satisfactory melt strength and ductility. This review aims to elucidate the relationship between interchain forces and/or entanglement with the melt strength and ductility of PLA‐based materials. An essential and systematic understanding of the tailoring melt strength and rheological properties of PLA by interchain forces and/or entanglement was apt to improve and perfect the processing technology of the extrusion blow, and consequently improve the tensile strength and toughness of PLA films.

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“…Generally, the introduction of long chain branched structure (LCBs) into linear polymer to enhance its matrix melt strength has been proved to be an e cient strategy [10,11]. The partial LCB structures in PLA are able to enhance the melt strength remarkably owing to the augment of the entanglements among the macromolecule chains, and the excellent melt strength and strain-hardening of star-shaped LCB macromolecules have already been con rmed in LCB polypropylene (LCB-PP) [12][13][14] and LCB-PLA [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

High Melt Performance Poly (lactic acid) with Dual Hybrid Long Branching Chains Prepared by Chain Degradation and Restructuring

Yang

Qin

et al. 2023

Preprint

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Long chain branched structure (LCBs) is the critical to upgrade the poly (lactic acid) (PLA) melt performance, while introducing LCBs via chain restructuring by melt transesterification features higher-efficiency, environment-friendly and gel-free properties. However, severe degradation associated with excessive transesterification renders the branching reaction non-dominant, resulting in a significantly narrow processing window for LCBs formation. Herein, a new strategy, dual hybrid branching (DHB), was put forward to overcome the challenges. Specifically, surface-aminated nano-ZnO (SAN-ZnO) was applied as a transesterification accelerant to prepare LCB-PLA via melt transesterification between high molecular weight PLA and low molar mass monomer trimethylolpropane triacrylate (TMPTA) in an internal mixer. Moreover, amidogens on the surface of SAN-ZnO was capable to collect the degraded PLA chains (PLA-COOH) and in situ react with their carboxyl thermal groups via amidation. Benefiting from DHB to facilitate LCBs formation and restrain excessive degradation, the melt performance of PLA, especially the melt strength, was obviously improved to over 37 cN compared with pristine PLA (4 cN), and the cold crystallization occurred earlier owing to the DHB chain structure.

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PLA with high elongation induced by multi-branched poly(ethylene imine) (mPEI) containing poly(l-lactic acid) (PLLA) terminals

Cited by 17 publications

References 19 publications

Fabrication of PLLA with High Ductility and Transparence by Blending with Tiny Amount of PVDF and Compatibilizers

Fabrication of PLLA with High Ductility and Transparence by Blending with Tiny Amount of PVDF and Compatibilizers

The Role of Interchain Force and/or Chain Entanglement in the Melt Strength and Ductility of PLA‐Based Materials

High Melt Performance Poly (lactic acid) with Dual Hybrid Long Branching Chains Prepared by Chain Degradation and Restructuring

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