Release date: 2018-04-03
According to a recent report by the US Daily Science website, biological tissues have complex mechanical properties - flexible and strong, but synthetic materials are difficult to reproduce these characteristics. Now, an international team has produced a biocompatible synthetic material that combines the mechanical properties of biological tissue with the ability to change color when deformed, as
In order to produce medical implants, it is necessary to select materials having similar mechanical properties to biological tissues to reduce inflammation or necrosis. Many tissues, including the skin, intestinal wall, and heart muscle, are very soft, but harden when stretched. Synthetic materials have so far failed to reproduce this behavior.
In the latest experiments, the researchers used a unique triblock copolymer to develop a composition with biological tissue properties—a physically crosslinked elastomer (artificial rubber) consisting of a central block on the central block. "Grafting" a side chain like a bottle brush.
They found that by carefully selecting the structural parameters of the polymer, the strain curve of the new material is the same as that of the biological tissue (the pig skin in this study). The new material is also biocompatible because it does not require additives such as solvents.
In addition, new materials can change color when deformed. Scientists have explained that this physical phenomenon is caused by light scattering from the polymer structure. Atomic force microscopy and X-ray diffraction experiments show that the end blocks of these polymers assemble into nanospheres that are distributed in a brush-like polymer matrix. Light can interfere with this microphase separation structure, and the spheres produce different colors due to the difference in distance, so when the material is stretched, it changes color.
The researchers said that the mechanical properties (elasticity, strain curve) and optical properties of the newly synthesized polymer are unprecedented. By adjusting the length or density of the "brush" side chain, these characteristics can be adjusted, and it is expected to develop medical implants or personalized fakes. Body (blood vessels, intraocular implants, etc.) and materials with new strain capabilities.
The latest research was jointly conducted by the French National Academy of Sciences (CNRS), the European Synchrotron Radiation Laboratory (ESRF) and American scientists. The paper was published in the latest issue of Science.
Source: Technology Daily
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