Simultaneously toughening and reinforcing high-density polyethylene via an industrial volume-pulsatile injection molding machine and Poly(ethylene terephthalate)

Qin, Sen; Lu, Xiang; Lv, Shao-yin; Xu, Wanhai; Zhang, Huan‐Huan; Tan, Lingcao; Qu, Jinping

doi:10.1016/j.compositesb.2020.108243

Cited by 21 publications

(9 citation statements)

References 64 publications

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“…Polyethylene terephthalate (PET), one of the most versatile thermoplastic polyesters, has shown a broad application range over the past decades. For example, since 1985, PET has been employed to fabricate vacuum blood collection tubes due to its robust mechanical properties, excellent biocompatibility, and ultrahigh transparency. , However, its inferior gas barrier performances are considered as one of the major obstacles for further practical application. , Hence, the gas barrier performances of PET imminently need to be boosted through a large variety of modification approaches including physical and chemical modification to further meet industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Transparent Intrinsic Barrier Polymer via Dynamic Pressure Engineering

Liu

Huang

Xu³

et al. 2023

Macromolecules

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Polymers with desirable barrier performances are urgently demanded for various applications, especially in dealing with COVID19. Current art mostly focuses on copolymerization, crystallization, melt blending, and surface modification, ultimately leading to compromised transparency, mechanical performances, and potential medical safety. In this work, we report a dynamic pressure driven approach for the first time can translate conventional nonbarrier polyethylene terephthalate (PET) into intrinsic barrier (ib-PET) material while maintaining its outstanding transparence by a single step. The oxygen permeability and water vapor transmission rate are 88% and 43% lower than those for conventional technique-processed nonbarrier PET, respectively, resulting from slower chain dynamics and reduction in the free volume. This work can construct a prospective avenue toward rational design for pristine materials with outstanding barrier properties and provide in-depth insight into the perception of dynamic pressure engineering, as well as provide a novel concept for tailoring and design of advanced polymers from the energy point of view.

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Section: Introductionmentioning

confidence: 99%

Transparent Intrinsic Barrier Polymer via Dynamic Pressure Engineering

Liu

Huang

Xu³

et al. 2023

Macromolecules

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“…In the compact bone, the stiff hydroxyapatite (HA) lamellar nanocrystals are bonded to collagen fibers through soft protein and hence impart the compact bone with notable strength and stiffness, where the collagen fibers and soft protein could provide significant toughness to the compact bone . Inspired from the biological hierarchical structure of the compact bone, forming one hybrid shish-kebab structure consisting of flexible fibers wrapped by crystalline phases could be attempted to overcome the challenge of maintaining the balance between strength and ductility. − …”

Section: Introductionmentioning

confidence: 99%

Facile and Scalable Fabrication of High-Performance Polylactide-Based Medical Microparts through Combining the Microinjection Molding Intense Shear Stress Field and Annealing Strategy

Xie

Xiong

Zheng

et al. 2022

Ind. Eng. Chem. Res.

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The second surgery for removing metallic internal fixation devices causes unbearable pain to orthopedic patients. Fortunately, poly(L-lactic acid) (PLLA), a bioabsorbable aliphatic polyester, has exhibited certain advantages in practical application due to its degradation over time in vivo with a minimal inflammatory response. However, the use of a PLLA bone screw for repairing defective bones is actually limited by the difficulty in realizing the balance between stiffness and toughness in current products. Herein, we report a novel strategy to fabricate the microbone screw from a blend of PLLA and poly[(butylene succinate)-co-adipate] (PBSA) by adopting the combination of the microinjection molding process featured with an intensive shear stress field and the subsequent annealing strategy. Accordingly, the hybrid shish-kebab structures consisting of flexible PBSA fibers attached by well-aligned lamellar crystals of PLLA could be generated, which prove to be able to overcome the difficulties well in keeping the balance between stiffness strength and toughness of the regular PLLA microparts. Thanks to the above-formed unique hybrid shish−kebab structures, the bone-mimicking PLLA/PBSA (90/10) blend material not only possesses excellent ductility (elongation at break of 51%) but also exhibits high stiffness (Young's modulus of 2.32 GPa) and balanced tensile strength (61.2 MPa). Moreover, the flexural measurements show that the fabricated PLLA/PBSA microbone screw also possesses good flexural properties (comparable flexural strength and much better toughness) compared to that of the pure PLLA bone screw. The strategy proposed in this work for fabrication of the PLLA-based microbone screw could be industrially scalable and shows good application prospects.

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“…In order to improve the properties of polymers for special applications, the principles of polymer blending seem very promising 1–3 . The performance and properties of polymer blends depend on the compatibility among the components of the blend.…”

Section: Introductionmentioning

confidence: 99%

Investigation the effect of processing condition and dispersed phase content on rheology–morphology relationship in polypropylene/polyethylene terephthalate microfibrillar composite

Hejazi

Masoomi

2022

Polymers for Advanced Techs

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Morphological evolutions during the production of microfibrillar composites can be investigated by considering two main steps: (1) the melt blending in the extruder and (2) the drawing process. Deformation, coalescence and break‐up of dispersed phase droplets under shear and elongational flow fields applied in these two main steps lead to the formation of fibrillar morphology. Therefore, it can be stated that the fibrillar morphology is controlled by dispersed phase content, rheological and interfacial properties of the components as well as dispersed phase domains relaxation. In this study, the effect of dispersed phase content on the morphology of the polypropylene/polyethylene terephthalate microfibrillar composite was investigated. Also, three following processing parameters were considered to evaluate the kinetics of in‐situ formation of the microfibrils: Extruder die temperature, water bath temperature and the drawing path length. Linear and nonlinear rheological tests were used as an efficient tool to investigate the rheology–morphology relationship. Among the processing parameters studied, the drawing path length and die temperature had the most and least effect on microfibrillar morphology, respectively. By increasing the drawing path length from 20 to 30 cm, the break‐up of the fibrils and non‐uniformity in the cross section of the fibrils caused a weaker strain recovery after stress removal and also a rapid reduction of stress after cessation of steady shear flow field. Increasing the die temperature has a similar but weaker effect on the final morphology. The rheological results in the linear viscoelastic range all indicated the formation of a physical network of microfibrils within the matrix.

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Simultaneously toughening and reinforcing high-density polyethylene via an industrial volume-pulsatile injection molding machine and Poly(ethylene terephthalate)

Cited by 21 publications

References 64 publications

Transparent Intrinsic Barrier Polymer via Dynamic Pressure Engineering

Transparent Intrinsic Barrier Polymer via Dynamic Pressure Engineering

Facile and Scalable Fabrication of High-Performance Polylactide-Based Medical Microparts through Combining the Microinjection Molding Intense Shear Stress Field and Annealing Strategy

Investigation the effect of processing condition and dispersed phase content on rheology–morphology relationship in polypropylene/polyethylene terephthalate microfibrillar composite

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