Preferred Adsorption of Shorter Chain on Solid Surface in Bidisperse Polymer Melt
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초록
내용
Polymer adsorption on solid surfaces significantly impacts material properties such as glass transition temperature, mechanical properties, and crystallization. While the adsorption behavior of monodisperse polymers is well-understood, that of bidisperse polymers, which is an extreme case of polydisperse, remains elusive. Theoretical studies suggest entropy-driven surface enrichment of shorter chains in chemically identical bidisperse polymer melts. However, experimental results show that long chains can enthaplically displace preadsorbed short chains, highlighting the need for further investigation. In this regards, we experimentally examined the competitive adsorption of bidisperse polymer melts on silica nanoparticles. Our findings identify a preferred adsorption of shorter chains, primarily driven by enthalpic effects. These results can provide new insights into polymer adsorption behavior and have significant implications for the design and optimization of polymer-based composite.