Highly toughening modification of Hyperbranched polyester with environment-friendly caprolactone as end group on poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

Han, Xiaolong; Jin, Yang; Huang, Jian; Tian, Huafeng; Guo, Maolin

doi:10.1007/s10924-022-02427-z

Cited by 6 publications

(5 citation statements)

References 31 publications

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“…Because the hydroxyl end groups of LCHBPs-Cl were relatively dispersed, LCHBPs-Cl cannot form hydrogen bonds through their interaction by itself alone. [27] . The peak of PLA displayed at 2995-2946 cm -1 was the stretching vibrations of -CH (-CH2-, -CH3) [28] .…”

Section: Resultsmentioning

confidence: 99%

Toughening Modification of Polylactic Acid by Long-Chain Hyperbranched Polymers Containing Polycaprolactone end Groups

et al. 2022

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The hyperbranched polyester were synthesized by the "one-step method" and grafted with caprolactone (ε-CL) to obtain long-chain hyperbranched polymers (LCHBPs-Cl). LCHBPs-Cl was then melt blended with PLA to study its effect on the toughness of PLA. Compared to the pure PLA, the most significant toughening effect was observed when the addition amount of LCHBPs-Cl was 2.0phr. The tensile strength was increased by 69.21% from 37MPa to 62.61 MPa, the impact strength was increased from 14.88kJ to 18.50kJ. The scanning electron microscope (SEM) images showed that the impact section of the blends was changed from smooth to rough, the brittle-ductile fracture transition occurred, and a large number of white wire drawing phenomena were produced. Due to the formation of topological entanglement and cohesive entanglement between the long-chain substituents of LCHBPs-Cl and PLA molecular chains, the plastic deformation of PLA was successfully improved.

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Section: Resultsmentioning

confidence: 99%

Toughening Modification of Polylactic Acid by Long-Chain Hyperbranched Polymers Containing Polycaprolactone end Groups

et al. 2022

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“…[ 29 ] However, without proper adhesion between the phases, there is no phase dispersion and homogeneity and no efficient stress transfer at the interface. [ 30,31 ]…”

Section: Resultsmentioning

confidence: 99%

“…[29] However, without proper adhesion between the phases, there is no phase dispersion and homogeneity and no efficient stress transfer at the interface. [30,31] The degree of crystallinity and glass transition temperature of the PLA matrix is also very important factor in dictating the mechanical behavior of the compatibilized blends. In this context, DSC curves are shown in Figure 3 and the results are presented in Table 4.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties of PLA/PCL Blends Compatibilized with PEG‐b‐PCL Multiblock Copolymer

Staffa

Bettini

Chinelatto

2022

Macromolecular Symposia

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Among the various kinds of copolymers that can be used as compatibilizers in poly (lactic acid) (PLA) and poly(ε‐caprolactone) (PCL) blends, copolymers containing segments of ε‐caprolactone and ethylene glycol (PEG) are an interesting choice because they are also biodegradable and biocompatible. A multiblock copolymer containing PEG and PCL segments, synthesized via one‐step bulk polycondensation, is added into PLA/PCL blend (80/20 wt%) at 1 and 5 wt% from the molten state, using a twin‐screw extruder. The effect of the PEG‐b‐PCL copolymer on the mechanical properties of PLA/PCL blends is investigated by tensile and Izod impact tests. The mixing of PCL with PLA does not promote adequate matrix toughness due to the incompatibility between the phases. The addition of only 1 wt% of the multiblock copolymer little changes the mechanical behavior of the blend. Only the compatibilized PLA/PCL blend with 5 wt% of the multiblock copolymer exhibits a significant increase in strain at break and notches Izod impact resistance in comparison with uncompatibilized PLA/PCL blends or neat PLA. Therefore, the addition of the PEG‐b‐PCL multiblock copolymer results in a marked change in the mechanical behavior, from brittle to ductile at room temperature, and confirms its compatibilization potential for the PLA/PCL immiscible blends.

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“…Epoxy‐terminated hyperbranched polymer (EHBP) is a distinctive form of hyperbranched polymer characterized by numerous surface functional groups. EHBP can create chemical micro‐crosslinking or hydrogen bonds with the molecular chain groups of other polymers 25–28 …”

Section: Introductionmentioning

confidence: 99%

“…EHBP can create chemical micro-crosslinking or hydrogen bonds with the molecular chain groups of other polymers. [25][26][27][28] In this work, PLA was blended with varying amounts of EHBP through a melt-blending process. The aim was to utilize the epoxy and hydroxyl groups present in EHBP to form micro-crosslinking and form hydrogen bonds with the carboxyl and hydroxyl groups of PLA, thereby enhancing its strength and toughness.…”

mentioning

confidence: 99%

Synergistic toughening and reinforcement of poly(lactic acid) with epoxy‐terminated hyperbranched polymers

Zhou,

Guo,

Jin

et al. 2023

J of Applied Polymer Sci

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Poly(lactic acid) (PLA) is an eco‐friendly and biodegradable material. However, its molecular chain was rigid and showed limited toughness. In this work, PLA was modified with epoxy‐terminated hyperbranched polymer (EHBP) by melt blending to improve the toughness. The results showed that epoxy groups within EHBP reacted with carboxyl and hydroxyl groups of PLA, forming chemical micro‐crosslinking. In addition, intermolecular hydrogen bonds were also formed between EHBP and PLA. The combined action of the above two aspects ultimately improved the toughness and strength of PLA. The mechanical property tests results showed that the mechanical properties of PLA improved best when 2.5 phr of EHBP was added. At this point, compared with neat PLA, the maximum tensile strength, impact strength, elongation at break, and flexural modulus of PLA/EHBP increased by 17.4%, 54.5%, 107.1%, and 25.8%, respectively, compared to those of neat PLA. It achieves the goal of simultaneously enhancing the toughness and strength of PLA and subsequently expands its potential application applications.

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Highly toughening modification of Hyperbranched polyester with environment-friendly caprolactone as end group on poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

Cited by 6 publications

References 31 publications

Toughening Modification of Polylactic Acid by Long-Chain Hyperbranched Polymers Containing Polycaprolactone end Groups

Toughening Modification of Polylactic Acid by Long-Chain Hyperbranched Polymers Containing Polycaprolactone end Groups

Mechanical Properties of PLA/PCL Blends Compatibilized with PEG‐b‐PCL Multiblock Copolymer

Synergistic toughening and reinforcement of poly(lactic acid) with epoxy‐terminated hyperbranched polymers

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