Silk cocoons as natural macro-balloon fillers in novel polyurethane-based syntactic foams

Shah, Darshil U.; Vollrath, Fritz; Porter, David

doi:10.1016/j.polymer.2014.09.021

Cited by 23 publications

(12 citation statements)

References 21 publications

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“…Incorporating bio‐based fillers into PU foams not only improve the mechanical properties, but also provide reactive groups to react with isocyanates. A series of bio‐based fillers like silk cocoon , walnut shells and hazelnut shells , sugarcane bagasse and coconut fiber , bamboo fiber , nanocrystalline cellulose , wood flour , etc. have been reported to be used in reinforcing PU foams in previous literatures.…”

Section: Introductionmentioning

confidence: 99%

Polyether polyol‐based rigid polyurethane foams reinforced with soy protein fillers

Tian

Xiang

2017

Vinyl Additive Technology

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In this work, soy protein/polyurethane (PU) composite foams were synthesized with polyether polyol and polyaryl polymethylene isocyanate as the starting materials, soy protein isolate as the reactive fillers, and water as the blowing agent. The structure and properties of the resulting composite foams were characterized by Fourier transform infrared spectra, scanning electron microscope, close cell ratio, density, mechanical properties, and so on. Strong hydrogen bonding interactions as well as chemical crosslinking occurred between the soy protein filler and PU matrix. The composite foams have more cell density, in the meantime, the average cell size decreased. The close cell ratio and foam density increased with the increase of soy protein. In addition, the compressive strength and thermal stability were enhanced, mainly ascribing to the reinforcing effect as well as the crosslinking effect of reactive soy protein fillers. Therefore, the resulting composite foams would possess improved properties compared with neat PU foam and their applications could be highly enlarged. J. VINYL ADDIT. TECHNOL., 24:E105–E111, 2018. © 2017 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Polyether polyol‐based rigid polyurethane foams reinforced with soy protein fillers

Tian

Xiang

2017

Vinyl Additive Technology

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“…Silkworms and a range of arthropods and insects including spiders and bees have evolved to spin protein fibers that nicely combine high strength and toughness for multiple functions. Natural silk fibers and cocoons are “ideal” defense and survival tools for the animals [ 1 – 4 ], and on the other hand the silk fibers from domesticated Bombyx mori silkworms have long been great attractions to the textile industry [ 5 – 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…Cocoons, consisting of twining silk fibers of a continuous length of approximately 1000 m and bonded together by sericin glue, are a typical natural fiber composite with hierarchical structures [ 1 , 9 , 10 ]. The widely studied silk fibers from the Bombyx mori silkworm cocoons are used not only as textile materials, but also as multifunctional materials [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Strain Rate and Anisotropic Microstructure Dependent Mechanical Behaviors of Silkworm Cocoon Shells

Zhou

Gao

et al. 2016

PLoS ONE

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Silkworm cocoons are multi-layered composite structures comprised of high strength silk fiber and sericin, and their mechanical properties have been naturally selected to protect pupas during metamorphosis from various types of external attacks. The present study attempts to gain a comprehensive understanding of the mechanical properties of cocoon shell materials from wild silkworm species Antheraea pernyi under dynamic loading rates. Five dynamic strain rates from 0.00625 s-1 to 12.5 s-1 are tested to show the strain rate sensitivity of the cocoon shell material. In the meantime, the anisotropy of the cocoon shell is considered and the cocoon shell specimens are cut along 0°, 45° and 90° orientation to the short axis of cocoons. Typical mechanical properties including Young’s modulus, yield strength, ultimate strength and ultimate strain are extracted and analyzed from the stress-strain curves. Furthermore, the fracture morphologies of the cocoon shell specimens are observed under scanning electron microscopy to help understand the relationship between the mechanical properties and the microstructures of the cocoon material. A discussion on the dynamic strain rate effect on the mechanical properties of cocoon shell material is followed by fitting our experimental results to two previous models, and the effect could be well explained. We also compare natural and dried cocoon materials for the dynamic strain rate effect and interestingly the dried cocoon shells show better overall mechanical properties. This study provides a different perspective on the mechanical properties of cocoon material as a composite material, and provides some insight for bio-inspired engineering materials.

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“…Pellegrino et al [13][14][15] presented that the PU based syntactic foam's strain rate sensitivity was superior to that of solid PU and conventional PU foams of similar density. However, higher content of the bubbles worsen the compression properties owing to an increased amount of defects in the structure of the filled polyurethane [14].…”

Section: Introductionmentioning

confidence: 99%

A Novel High Strain Rate Sensitive Rigid Polyurethane Resin Based Syntactic Foam

Yazıcı

2016

Acta Phys. Pol. A

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Syntactic foams are closed cell structured foam materials and present improved properties for lightweight and high performance material requests. They have been widely used in naval, aeronautical, aerospace, civil, industrial, and automotive engineering applications on account of their good acoustical attenuation, excellent strength to weight ratio, vibration isolation, dielectric properties. In this study, a novel high strain rate sensitive syntactic foam was developed. A rigid polyurethane resin was used as a binder material. Glass bubbles were used as an additive for producing cell structure. Elastomeric silicone rubber resin were used to change elastic properties of the foam as an additional binder material. Quasistatic compression properties and high strain rate compression properties were obtained by using Instron Universal Tensile-Compression Machine and Split Hopkinson Pressure Bar experimental setup respectively. The results show that developed foams are low dense and very high strain rate sensitive materials. Consequently, developed foam can be used for the blast, impact or ballistic mitigation purpose as a coating material.

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Silk cocoons as natural macro-balloon fillers in novel polyurethane-based syntactic foams

Cited by 23 publications

References 21 publications

Polyether polyol‐based rigid polyurethane foams reinforced with soy protein fillers

Polyether polyol‐based rigid polyurethane foams reinforced with soy protein fillers

Strain Rate and Anisotropic Microstructure Dependent Mechanical Behaviors of Silkworm Cocoon Shells

A Novel High Strain Rate Sensitive Rigid Polyurethane Resin Based Syntactic Foam

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