Supported by the National Natural Science Foundation of China (approval numbers: 21973083, 21504081, 21674100, 21873085), Professor Zuo Biao of Zhejiang Sci-Tech University and foreign collaborators Rodney Priestley and David Simmons have conducted research on the molecular dynamics mechanism of glassy polymer surfaces.
Polymer materials are formed by polymer compounds with relative molecular weights as high as several thousand to several million
The team developed a method based on the surface tension of the droplet to induce the surface deformation of the polymer surface nano-creep, and established a wide-time domain, multi-scale surface polymer dynamics characterization method with a relaxation time span of 6 to 8 orders of magnitude.
The proposal of the “pseudo-entanglement” mechanism and the discovery of the “transient rubber state” on the surface not only deepen the understanding of the nature of interface phenomena such as material wear, friction, adhesion, and self-healing, but also reveal that the depth distribution of molecular motion capabilities affects the surface polymer chains.
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