Study of the kinetics of the pancake-to-brush transition of poly(N-isopropylacrylamide) chains

Article Abstract:

The chemical grafting of thiol-terminated poly(N-isopropylacrylamide) (HS-PNIPAM) chains to a gold surface from a solution was investigated by a quartz crystal microbalance (QCM) in real time. The frequency and energy dissipation response revealed that the short HS-PNIPAM chain exhibit three-regime kinetics of the grafting, in regime I and II the HS-PNIPAM chains form pancake and mushroom structure and regime III chains forms brushes.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Electronic components, not elsewhere classified, All Other Miscellaneous Nonmetallic Mineral Product Manufacturing, Gold, Quartz Crystals, Analysis, Chemical reaction, Rate of, Chemical kinetics

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Collapse and swelling of thermally sensitive poly(N-isopropylacrylamide) brushes monitored with a quartz crystal microbalance

Article Abstract:

The temperature dependence of collapse and swelling of poly(N-isopropylacrylamide) (PNIPAM) brushes grafted on SiO(sub 2) surface in water with a quartz crystal microbalance. The results revealed that there exists a hysteresis in the swelling of the collapsed chains, which is attributed to the intrachain and interchain interactions formed in the collapsed state at higher temperatures and the nonuniformity of the brushes.

All Other Basic Organic Chemical Manufacturing, All Other Basic Inorganic Chemical Manufacturing, Industrial Organic Chemicals, Industrial inorganic chemicals, not elsewhere classified, Silicon Dioxide, Acrylamides, Acrylamide

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Conformational changes of poly(N-isopropylacrylamide) chains at air/water interface: Effects of temperature, compression rate, and packing density

Article Abstract:

The effects of temperature, compression rate, and packing density on conformational properties of polystyrene-block-poly(N-isopropylacryamide) (PS-b-PNIPAM) diblock copolymer monolayers at the air/water interface is investigated. The results have shown that the stimuli-responsive properties of PNIPAM chains at the interface can be manipulated by adjusting the conformations of PNIPAM chains.

Plastics Material and Resin Manufacturing, Plastics materials and resins, Polystyrene, Styrene Resins, Polystyrene Resins NEC, Block copolymers, Hydrophobic effect

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