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the abstract for an academic paper
Utilization of bionics for developing self-healing functional polymer that can heal damage with restorability is particularly attractive for sustainable societies. Herein, inspired by chamaeleonida, healable photochromic polymer networks with hieratical structure incorporating dynamic hydrogen-bonding interaction and photochromic spirooxazine (SP) were prepared. The self-healing ability (complete recovery of scratch as well as restoration against 1900% strain and 1.9 MPa tensile stress under moderate condition) is originated from many sacrificial junctions created by hydrogen-bonding interactions that also enhance extensibility (from 600% to 2600%). The covalent framework can prevent macroscopic deformation and maintain elasticity. This combination of high extensibility, good self-healing ability and smart photochromic property in thermosetting polymers should largely improve their applicability and reliability in various materials and devices
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It's snowing now
It begins snowing outside. It's the first snowing in Chengdu this year. I wore thick clothes this morning because it's really cold today. My feet are frozen stiff now. There is just light snow in the center downtown while it's much heavier in the suburb area like the region between the Second Ring Road and the Third Ring Road. I think it's resulted from the heat island effect, which means the denser human activities in the city center impels the increasing rate of temperature to be larger than the surrounding areas, which enables the city center a higher temperature like a heat island.
Living in Chengdu is wonderful especially when it comes the unexpectable snow after a few tedious winters without any snow.
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How to learn the slang for a foreign language learner?
I find that English speakers like using slangs in their daily communication. But it is not easy for a foreign language learner to get the point of them. So how to figure out the meaning of slangs when they encounter this situation?
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