by Staff Writers
Montreal, Canada (SPX) Jun 16, 2015
Professors Frederick Gosselin and Daniel Therriault, along with their master's student Renaud Passieux, are not related to Spiderman. Nevertheless, these Polytechnique Montreal researchers have produced an ultra-tough polymer fibre directly inspired by spider silk! They recently published an article about the project in the journal Advanced Materials.
Spider silk: a thread with stunning properties
In large part, spider silk owes its exceptional strength - meaning its ability to absorb a large amount of energy before failing - to the particular molecular structure of the protein chain of which it's composed. The mechanical origin of its strength drew the interest of researchers at the Laboratory for Multiscale Mechanics in Polytechnique Montreal's Department of Mechanical Engineering.
"The silk protein coils upon itself like a spring. Each loop of the spring is attached to its neighbours with sacrificial bonds, chemical connections that break before the main molecular structural chain tears," explained Professor Gosselin, who, along with his colleague Daniel Therriault, is co-supervising Renaud Passieux's master's research work.
He added: "To break the protein by stretching it, you need to uncoil the spring and break each of the sacrificial bonds one by one, which takes a lot of energy. This is the mechanism we're seeking to reproduce in laboratory,"
Imitating nature with polymer fibres
"The filament forms a series of loops or coils, kind of like when you pour a thread of honey onto a piece of toast. Depending on the instability determined by the way the fluid runs, the fibre presents a particular geometry. It forms regular periodic patterns, which we call instability patterns."
The fibre then solidifies as the solvent evaporates. Some instability patterns feature the formation of sacrificial bonds when the filament makes a loop and bonds to itself. At that point, it takes a pull with a strong energy output on the resulting fibre to succeed in breaking the sacrificial bonds, as they behave like protein-based spider silk.
"This project aims to understand how the instability used in making the substance influences the loops' geometry and, as a result, the mechanical properties of the fibres we obtain," explained Professor Therriault.
"Our challenge is that the manufacturing process is multiphysical. It draws on concepts from numerous fields: fluid mechanics, microfabrication, strength of materials, polymer rheology and more."
A vast range of applications for future tough fibre composites
Space Technology News - Applications and Research
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