Fatigue of Self-Healing Nanofiber-based Composites: Static Test and Subcritical Crack Propagation

Lee, Min Wook; Sett, Soumyadip; Yoon, Sam S.; Yarin, Alexander L.

doi:10.1021/acsami.6b05390

Cited by 43 publications

(37 citation statements)

References 42 publications

(88 reference statements)

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“…So far, fatigue resistance of self-healing polymers and polymer composites has not been extensively studied. Moreover, healing speed is not the main concern of these available works [35][36][37][38][39][40][41][42][43]. In this context, the present investigation might add to the researches in this area.…”

Section: Introductionmentioning

confidence: 90%

Improvement of fatigue resistance of epoxy composite with microencapsulated epoxy-SbF5 self-healing system

Ye¹,

Zhu²,

Yuan³

et al. 2017

Express Polym. Lett.

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Abstract. Rapid retardation and arresting of fatigue crack are successfully realized in the epoxy composite containing microencapsulated epoxy and ethanol solution of antimony pentafluoride-ethanol complex (SbF 5 ·HOC 2 H 5 /HOC 2 H 5 ). The effects of (i) microcapsules induced-toughening, (ii) hydrodynamic pressure crack tip shielding offered by the released healing agent, and (iii) polymeric wedge and adhesive bonding of cured healing agent account for extension of fatigue life of the material. The two components of the healing agent can quickly react with each other soon after rupture of the microcapsules, and reconnect the crack only 20 seconds as of the test. The applied stress intensity range not only affects the healing efficiency, but also can be used to evaluate the healing speed. The present work offers a very fast healing system, and sets up a framework for characterizing speed of self-healing.Keywords: smart polymers, fracture and fatigue, self-healing, epoxy eXPRESS Polymer Letters Vol.11, No.11 (2017) [34,35]. In other words, retardation or arresting of fatigue crack is rather sensitive to the polymerization rate of healing agent. Therefore, the effect of fatigue crack induced liberation of healing agent can be conveniently monitored by mechanical response of the composite, i.e. in-situ crack re-binding and growth under cyclic stress. In contrast, other destructive characterization methods, like tensile [15] and impact tests [24,27], need time for manually recombining the fractured specimens for healing and quite a few fast healing agent would have been cured in advance. The measured dependence of healing efficiency on healing time has to be associated with large error. So far, fatigue resistance of self-healing polymers and polymer composites has not been extensively studied. Moreover, healing speed is not the main concern of these available works [35][36][37][38][39][40][41][42][43]. In this context, the present investigation might add to the researches in this area. Experimental 2.1. MaterialsDiglycidyl ether of bisphenol A (EPON 828, epoxy value: 0.53~0.54 mol/100 g), supplied by Shell Co., served as the composite's matrix and the polymerizable component of healing system. Antimony pentafluoride (SbF 5 ) was purchased from Tianjin Institute of Physical and Chemical Engineering of Nuclear Industry, China. Borontrifluoride-2,4-dimethylaniline-complex (BF 3 ·DMA) and methyl hexahydrophthalic anhydride (MHHPA) were bought from Energy Chemical, Shanghai, China. Ethanol, tetraethyl orthosilicate (TEOS), styrene and methyl acrylate were supplied by Alfa Aesar GmbH, Germany. Prior to use, styrene and methyl acrylate were washed with sodium hydroxide aqueous solution (5 wt%), thereafter three times with water, dried over magnesium sulphate, and evaporated to dryness in vacuum. Azobisisobutyronitrile (AIBN) was obtained from Sigma-Aldrich, and purified by recrystallization.Melamine and formaldehyde were supplied by Sinopharm Chemical Reagent Co., Ltd, Shanghai, China. Specimens preparationEpoxy mono...

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Section: Introductionmentioning

confidence: 90%

Improvement of fatigue resistance of epoxy composite with microencapsulated epoxy-SbF5 self-healing system

Ye¹,

Zhu²,

Yuan³

et al. 2017

Express Polym. Lett.

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“…They showed that the incorporation aforementioned C/S nanofibers, containing healing agents, in a conventional carbon/epoxy composite not only led to fabricating a self‐healing polymer matrix composite but also improved mechanical properties of the host composite. Lee et al . also employed a solution‐blown method to encapsulate two part epoxy resin and its curing agent via PVDF/PEO blend shell.…”

Section: C/s Nanofibersmentioning

confidence: 99%

Recent advances in core/shell bicomponent fibers and nanofibers: A review

Naeimirad

Ali

Kotek

et al. 2018

J of Applied Polymer Sci

140

103

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There has been a steady progress in developing synthetic fibers in the past few years. Bicomponent fibers and nanofibers in a core/shell (C/S) configuration, including two dissimilar materials have presented unusual potential for use in many novel applications. These fibers can be produced using a variety of materials via different techniques i.e., coaxial melt spinning and electrospinning. In this review, we discuss the recent advances in C/S fibers and nanofibers' production. The first part has been assigned to the bicomponent fibers manufacturing technology, while production and applications of C/S nanofibers have been described in the second part.

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“…These tubes may have some reinforcing effect on the polymer, but it is likely that their net effect will be to reduce strength. Recently, various other approaches have been used to create inbuilt vascular‐type systems, which have achieved impressive levels of damage reduction and life extension . See, for example, Fig.…”

Section: Opportunities For Biomimeticsmentioning

confidence: 99%

“…Recently, various other approaches have been used to create inbuilt vascular-type systems, which have achieved impressive levels of damage reduction and life extension. 64,65 See, for example, Fig. 10 showing repair in a vascular-type structure incorporated into a fibre reinforced polymer.…”

Section: O P P O R T U N I T I E S F O R B I O M I M E T I C Smentioning

confidence: 99%

Self‐healing materials: what can nature teach us?

Dooley

Taylor

2017

Fatigue Fract Eng Mat Struct

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Natural materials such as bone and insect cuticle are capable of self‐repair, a facility that greatly increases their durability and safe working stress. Some engineering materials have also been designed to be self‐healing, although currently they cannot match the performance of natural materials as regards the efficiency and longevity of the healing process. In this paper, we review the state of the art regarding these two types of materials. We discuss the role of fracture mechanics in the development of theoretical models of self‐healing; we identify certain crucial parameters that make natural materials successful and discuss how these lessons can be applied to improve the performance of self‐healing materials for engineering applications.

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Fatigue of Self-Healing Nanofiber-based Composites: Static Test and Subcritical Crack Propagation

Cited by 43 publications

References 42 publications

Improvement of fatigue resistance of epoxy composite with microencapsulated epoxy-SbF5 self-healing system

Improvement of fatigue resistance of epoxy composite with microencapsulated epoxy-SbF5 self-healing system

Recent advances in core/shell bicomponent fibers and nanofibers: A review

Self‐healing materials: what can nature teach us?

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