Glass transition temperature of single-chain polystyrene particles end-grafted to oxide-coated silicon

Abstract

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The role of the molecular weight of the adsorbed layer on a substrate in the suppressed dynamics of supported thin polystyrene films

“…Roth et al 59 also found that for PS chains adjacent to the PS-grafted chains, the chain connectivity played an important role in T g perturbation over a wide range (∼100 nm). In our previous report, 60 the weak molecular weight dependence of the T g for PS single chains end-grafted on the substrate was observed, indicating that the lower mobility character of segments around the grafted point may be transferred to other parts along the polymer chain owing to the connectivity between the substrate and end-tethering chains. Therefore, the results in this paper could be explained as follows.…”

Strain Rate and Thickness Dependences of Elastic Modulus of Free-Standing Polymer Nanometer Films

“…Polymer films are used in a myriad of applications, including food or medical packaging, − separation membrane, , polymer electrolyte fuel cells, , and so on. While most applications employ polymers in the micrometer size range, − ,− some employ them in the nanometer size range. ,, Many studies of polymers under confinement in nanometers − have found that the glass transition temperature, T g , − and effective viscosity, η eff , − ,, deviate from the bulk values and vary with the size of confinement. It is generally agreed that confinement causes dynamic properties to change, attributable to perturbations to the local dynamics by the confining walls or interfaces.…”

Enhanced Dynamics of PMMA Brushes Induced by the Chain Ends of a Flexible Polymer Chain

“…Due to the rapid development of nanoscience and nanotechnology, molecular-scale materials and devices have been revealed to have great potential with unique properties and functions that cannot be achieved at macroscopic scales . Understanding the physical and chemical properties of single molecules provides new perspectives on crucial fundamental issues in chemistry, physics, and biology. , Block copolymers with different chemical compositions and mobility have been one of the most important studied materials, and their extensive use in potential applications is expected to be important for nanoscience and nanotechnology. In addition, since different blocks in the block copolymer are connected, the dynamics of one block are inevitably affected by the connectivity of another block, which affects the overall performance of the block copolymer, such as mechanical and self-assembly characteristics.…”