Expanded polytetrafluoroethylene as an auxetic material: effect of extension ratio on its structure and properties

Xu, Chao; Tu, Yonghui; Yu, Ruobing; Xue, Ye

doi:10.1007/s13726-017-0581-6

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…Recently, numerous developments in the field of auxetic polymeric materials, including foam, fiber, and even composite, have taken place. Examples of such materials include polytetrafluoroethylene (PTFE) [94], polyester urethane (PU) [95], ultra-high molecular weight polyethylene (UHMWPE) [96], polypropylene foam (PP) [97], polyester [98], nylon [99], liquid crystalline polymers [100] and other synthetic molecular auxetic polymer [101]. In addition to polymeric materials, different varieties of auxetic materials based on metal, ceramic, and other inorganic materials have also been synthesized [102][103][104].…”

Section: Auxetic Structuresmentioning

confidence: 99%

4D printing of fiber-reinforced auxetic structures: the building blocks: a review

Karima,

Habibi,

Laperrière

2024

Smart Mater. Struct.

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Four-dimensional (4D) printing has recently received much attention in the field of smart materials. It concerns using additive manufacturing to obtain geometries that can change shape under the effect of different stimuli. Such a technique enables the fabrication of 3D printed parts with the additional functionality of scalable, programmable, and controllable part shapes over time. This review provides a comprehensive examination of advances in the field of 4D printing, emphasizing the integration of fiber reinforcement and auxetic structures as crucial building blocks. The incorporation of fibers enhances structural integrity, while auxetic design principles contribute unique mechanical properties, such as negative Poisson's ratio and great potential for energy absorption due to their specific deformation mechanisms. Therefore, they present potential applications in aerospace, drones, and robotics.The objective of this review article is first to describe the distinctive properties of shape memory polymers (SMPs), auxetic structures, and composite (fiber-reinforced) materials. A review of applications that use combinations of such materials is also presented when appropriate. The goal is to get a grip on the delicate balance between the different properties achievable in each case. The paper concludes by describing recent advances in 4D printing of fiber-reinforced auxetic structures.

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Section: Auxetic Structuresmentioning

confidence: 99%

4D printing of fiber-reinforced auxetic structures: the building blocks: a review

Karima,

Habibi,

Laperrière

2024

Smart Mater. Struct.

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The Property of a Novel Elastic Material Based on Modified Waste Rubber Powder (MWRP) by the Establishment of New Crosslinking Network

Zhang

Song

2020

Waste Biomass Valor

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Biaxial stretching of polytetrafluoroethylene in industrial scale to fabricate medical ePTFE membrane with node-fibril microstructure

Wang

Feng

Gao

et al. 2023

Regenerative Biomaterials

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Expanded polytetrafluoroethylene (ePTFE) is promising in biomedical fields such as covered stents and plastic surgery owing to its excellent biocompatibility and mechanical properties. However, ePTFE material prepared by the traditional biaxial stretching process is with thicker middle and thinner sides due to the bowing effect, which poses a major problem in industrial-scale fabrication. To solve this problem, we design an olive-shaped winding roller to provide the middle part of the ePTFE tape with a greater longitudinal stretching amplitude than the two sides, so as to make up for the excessive longitudinal retraction tendency of the middle part when it is transversely stretched. The as-fabricated ePTFE membrane has, as designed, uniform thickness and node-fibril microstructure. In addition, we examine the effects of mass ratio of lubricant to PTFE powder, biaxial stretching ratio, and sintering temperature on the performance of the resultant ePTFE membranes. Particularly, the relation between the internal microstructure of the ePTFE membrane and its mechanical properties is revealed. Besides stable mechanical properties, the sintered ePTFE membrane exhibits satisfactory biological properties. We make a series of biological assessments including in vitro hemolysis, coagulation, bacterial reverse mutation and in vivo thrombosis, intracutaneous reactivity test, pyrogen test, and subchronic systemic toxicity test; all of the results meet the relevant international standards. The muscle implantation of the sintered ePTFE membrane into rabbits indicates acceptable inflammatory reactions of our sintered ePTFE membrane fabricated in industrial scale. Such a medical-grade raw material with the unique physical form and condensed-state microstructure is expected to afford an inert biomaterial potentially for stent-graft membrane.

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Expanded polytetrafluoroethylene as an auxetic material: effect of extension ratio on its structure and properties

Cited by 3 publications

References 24 publications

4D printing of fiber-reinforced auxetic structures: the building blocks: a review

4D printing of fiber-reinforced auxetic structures: the building blocks: a review

The Property of a Novel Elastic Material Based on Modified Waste Rubber Powder (MWRP) by the Establishment of New Crosslinking Network

Biaxial stretching of polytetrafluoroethylene in industrial scale to fabricate medical ePTFE membrane with node-fibril microstructure

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