Pressure-Sensitive Molecular Film

Matsuda Y, Mori H, Niimi T, Uenishi H, Hirako M (2007) Development of pressure sensitive molecular film applicable to pressure measurement for high Knudsen number flows. Exp Fluids 42 543-550... 

Pressure-sensitive molecular film (PSMF) is a molecular film sensor to nonintrusively measure the air pressure distribution on an applied stuface. PSMF is an ordered molecular assembly composed of luminescent dyes and spacer molecules (i.e., molecular film of pressure-sensitive paint (PSP)). The pressure is obtained from the luminescent intensity of PSMF (more precisely the luminescent dyes), which depends on the pressure due to oxygen quenching. 

Pressure-sensitive molecular film (PSMF) is a molecular film of pressure-sensitive paint (PSP) to overcome limitations on application of PSP to microscale measurements and is a powerful technique for pressure measurement of micro gas flows. PSMF enable to nOTiintrusively measure the pressure distribution with a high spatial resolution. In particular, PSMF can measure the pressure distribution of internal gas flows through a micro-channel, which cannot be measured by other methods such as a pressure tap connected to a pressure transducer. 

Pressure-Sensitive Molecular Film, Fig. 4 The relation between the luminescent intensity and pressure, (a) shows the luminescent intensity as a function of pressure. 

Pressure-Sensitive Molecular Film, Fig. 6 The Stem-Volmer plots for PSMFs of PtMP, PtMPDME, PtPP, and CuMPDME. The referoice pressure =21 kPa of pure... 

Pressure-Sensitive Molecular Film, Fig. 7 The AFM images of slide glass and PSMF surface [11]... 

Matsuda Y, Uchida T, Suzuki S, Misaki R, Yamaguchi H, Niimi T (2011) Pressure-sensitive molecular film for investigation of micro gas flows. Microfluid Nanofluid 10 165-171... 

Ethyl Vinyl Ether. The addition of ethanol to acetylene gives ethyl vinyl ether [104-92-2] (351—355). The vapor-phase reaction is generally mn at 1.38—2.07 MPa (13.6—20.4 atm) and temperatures of 160—180°C with alkaline catalysts such as potassium hydroxide and potassium ethoxide. High molecular weight polymers of ethyl vinyl ether are used for pressure-sensitive adhesives, viscosity-index improvers, coatings and films lower molecular weight polymers are plasticizers and resin modifiers. 

Working with less dilute solutions of elastomers one cannot fail to notice the influence (the stiffer the greater the effect) of molecular structure on the onset and course of non-Newtonion flow, on gelation and swelling, and the influence of the solvent as expressing itself by virial coefficients, molecular dimensions in solution, spinnability, and film forming. The sensitivity with which the tack of adhesives, demonstrated by pressure sensitive tapes which at that time reached the market, depends on the structure and composition of the elastomer was similarly striking and raised the question, which molecular structure or state was best suited to exhibit tacky adhesion, or adhesion per se. 

The properties that determine whether a product can be labelled as a pressure sensitive adhesive are tack, peel and creep. Tack is the property related to bond formation. Peel defines the tension or force necessary to remove the adhesive tape. Creep is the property describing the flow characteristics of the PSA. Formulators need to be aware of any factors that can directly affect these three properties such as temperature, aging, film thickness, cure rate and post-cure parameters. There are also several formulation variables - these include oligomer selection, tackifier addition, monomer structure, molecular weight and glass transition - that directly impact tack, peel and creep. 

Plank GR, Estok II DM, Muratoglu OK, O Connor DO, Burroughs BR, Harris WH. Contact stress assessment of conventional and highly crosslinked ultra high molecular weight polyethylene acetabular liners with finite element analysis and pressure sensitive film. J Biomed Mater Res B Appl BiomaterlOOl Januaty 80(l) l-lO. 

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