Comparison of toughening mechanisms in natural silk-reinforced composites with three epoxy resin matrices

Yang, Kang; Wu, Zihong; Zhou, Changgeng; Cai, Siyu; Wu, Zhentao; Tian, Wenhan; Wu, Su Jun; Ritchie, Robert O.; Guan, Juan

doi:10.1016/j.compositesa.2021.106760

Cited by 42 publications

(16 citation statements)

References 37 publications

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“…Silk–PCL composites were fabricated by hot-pressing PCL melt and silk fabrics with/without surface modifications. Here, DMTA was used to probe the effect of interfacial interactions of silk on the glass transition behavior of PCL in silk-reinforced PCL composites Figure a schematically shows a silk fiber-reinforced PCL composite, and Figure b shows photographic images of typical composites from virgin/modified silks.…”

Section: Resultsmentioning

confidence: 99%

“…Here, DMTA was used to probe the effect of interfacial interactions of silk on the glass transition behavior of PCL in silk-reinforced PCL composites. 49 Figure 7a schematically shows a silk fiber-reinforced PCL composite, and Figure 7b shows photographic images of typical composites from virgin/ modified silks. The DMTA curves of storage modulus E′ or loss tangent tan δ as a function of temperature are shown in Figure 7c,d.…”

Section: Interfacial Adhesion Between Silk and Pcl Dropletsmentioning

confidence: 99%

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Restructuring the Interface of Silk–Polycaprolactone Biocomposites Using Rigid-Flexible Agents

Zhao

Chen

et al. 2022

Biomacromolecules

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Natural fiber-reinforced biocomposites with excellent mechanical and biological properties have attractive prospects for internal medical devices. However, poor interfacial adhesion between natural silk fiber and the polymer matrix has been a disturbing issue for such applications. Herein, rigid-flexible agents, such as polydopamine (PDA) and epoxy soybean oil (ESO), were introduced to enhance the interfacial adhesion between Antheraea pernyi (Ap) silk and a common medical polymer, polycaprolactone (PCL). We compared two strategies of depositing PDA first (Ap− PDA−ESO) and grafting ESO first (Ap−ESO−PDA). The rigidflexible interfacial agents introduced multiple molecular interactions at the silk−PCL interface. The "Ap−PDA−ESO" strategy exhibited a greater enhancement in interfacial adhesion, and interfacial toughening mechanisms were proposed. This work sheds light on engineering strong and tough silk fiber-based biocomposites for biomedical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Interfacial Adhesion Between Silk and Pcl Dropletsmentioning

confidence: 99%

Restructuring the Interface of Silk–Polycaprolactone Biocomposites Using Rigid-Flexible Agents

Zhao

Chen

et al. 2022

Biomacromolecules

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“…It's known that the resin toughness has a direct and important impact on the interface and macroscopic mechanical properties of resin matrix composites. [22][23][24][25] However, E-beam curable resin has low toughness, showing poor ability to inhibit crack propagation and is easy to crack under the action of external load, while the cracks extending from the matrix to the interface or the rapid expansion of tiny cracks originally existing at the interface can easily cause the integral de-bonding of the interface and directly lead to the failure of the component destroy. The strength and toughness of the initial electron beam curing resin are even lower than the minimum standard of thermal curing resin.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon nanotubes on curing characteristics of low energy electron beam curing CFRPs

Zhang

Liang

2023

Polymers for Advanced Techs

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Low energy electron beam (E‐Beam) curing process has been considered a promising fabrication technology in high‐efficiency and low‐cost OOA curing, but still not been widely used in industrial applications, mainly limited by the poor mechanical properties of the CFRP resulting from the poor toughness of the low‐energy E‐Beam curable resin. This paper extended the excellent effect of carbon nanotubes (CNTs) toughened resin to the E‐Beam curable resin system, and focused on the influence law and mechanism of CNTs on the curing characteristics of the resin. Theoretical analysis showed that the carboxylated CNTs affect the curing characteristics by participating in the chain transfer link of the cationic curing process. According to the DSC experimental results, the activation energy of the curing reaction of the resin were reduced from 136.2 kJ·mol−1 without adding CNTs to 123.9 kJ·mol−1, 118.3 kJ·mol−1, 112.8 kJ·mol−1 and 105.8 kJ·mol−1 at 0.25 wt.%, 0.5 wt.%, 0.75 wt.% and 1 wt.% of CNTs adding amount respectively, due to which the curing degree of the E‐Beam curable CFRPs were improved with the increase of CNTs contents. Considering the E‐Beam dose attenuation and its influence on curing characteristics, prepregs were irradiated single‐sided or both sided for efficient preparation of E‐Beam cured CFRP components subsequently, for which the curing degree along the prepreg thickness were investigated through the curing reaction kinetic models and DSC experiments. This study will provide research basis for parameter optimization of CNTs contents, and performance improvement of E‐Beam cured CNTs/CFRP.

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“…Advanced polymer matrix composites have been widely adopted in fields such as aerospace and astronautics because of their excellent specific mechanical properties. − Developing matrices with high moduli, high strength, and high toughness is of great significance for improving the performance of advanced polymer composites. , However, high strength and high modulus usually cannot coexist with high toughness. Elevating the moduli and strength of polymers usually leads to a decrease in toughness.…”

Section: Introductionmentioning

confidence: 99%

“…1−3 Developing matrices with high moduli, high strength, and high toughness is of great significance for improving the performance of advanced polymer composites. 4,5 However, high strength and high modulus usually cannot coexist with high toughness. Elevating the moduli and strength of polymers usually leads to a decrease in toughness.…”

Section: ■ Introductionmentioning

confidence: 99%

Machine-Learning-Assisted Design of Highly Tough Thermosetting Polymers

Zhao

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Despite advances in machine learning for accurately predicting material properties, forecasting the performance of thermosetting polymers remains a challenge due to the sparsity of historical experimental data and their complicated crosslinked structures. We proposed a machine-learning-assisted materials genome approach (MGA) for rapidly designing novel epoxy thermosets with excellent mechanical properties (high tensile moduli, high tensile strength, and high toughness) through high-throughput screening in a vast chemical space. Machine-learning models were established by combining attention- and gate-augmented graph convolutional networks, multilayer perceptrons, classical gel theory, and transfer learning from small molecules to polymers. Proof-of-concept experiments were carried out, and the structures designed by the MGA were verified. Gene substructures affecting the modulus, strength, and toughness were also extracted, revealing the mechanisms of polymers with high mechanical properties. The developed strategy can be employed to design other thermosetting polymers efficiently.

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Comparison of toughening mechanisms in natural silk-reinforced composites with three epoxy resin matrices

Cited by 42 publications

References 37 publications

Restructuring the Interface of Silk–Polycaprolactone Biocomposites Using Rigid-Flexible Agents

Restructuring the Interface of Silk–Polycaprolactone Biocomposites Using Rigid-Flexible Agents

Effect of carbon nanotubes on curing characteristics of low energy electron beam curing CFRPs

Machine-Learning-Assisted Design of Highly Tough Thermosetting Polymers

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