Pressure-sensitive rubber

Typical formulation of a pressure-sensitive rubber adhesive... 

Rubber-grade resins are mostly in the softening point range 70-100°C R B. A deviation of 5-10°C in softening point may cause problems. The softening point of a resin affects the properties of adhesives. Hence, for pressure-sensitive rubber adhesives the decrease in the softening point of the resin produces a more tacky adhesive with less cohesive strength. 

Fig. 16.2. Integration of organic transistors with pressure-sensitive rubber sheets, (a) A cross-sectional view of the device structure and (b) a circuit diagram of one sensor cell. The device is formed by laminating four different functional films. The pressure sensors are...

As shown in Fig. 16.2, the pressure sensors are formed as pressure-sensitive rubber (3) sandwiched between two electrodes and connected to the transistors though via holes (2). Voltage bias Vdd is connected to the transistor when pressure is applied to the sensors, enabling detection of the distribution of pressure. 

Fig. 16.4. A measured waveform of electronic artificial skin. When pressure is applied to the sensor matrix, the pressure-sensitive rubber becomes conductive and the bit line is pulled up to the supply voltage. (I) Input signals of...

FIGURE 6.3.1 A flexible, large-area pressure sensor. Organic transistor active matrix is formed on a plastic film and integrated with pressure-sensitive rubber. 

FIGURE 6.3.2 An image of electronic artificial skin attached on the robot surface. A plastic film with organic transistors, a pressure-sensitive rubber sheet, and a plastic film with top electrodes are laminated together to form a large-area pressure sensor. Some parts of films are removed intentionally to show the inner structures. 

The device is manufactured by laminating three different functional films (1) a base plastic film with organic transistors (2) a pressure-sensitive rubber sheet and (3) a film suspending copper electrodes for power supply. One sensor cell (sensei) consists of one organic transistor and one pressure sensor. 

The response time of the pressure-sensitive rubber is typically of the order of hundreds of milliseconds, and the individual sensor does not respond to the higher frequency. It should be noted, however, that the readout time of entire 16x16 sensor cell array is not the response time of individual transistors multiplied by 16 x 16, since an active matrix scheme is used. The scan speed of the entire sensor cell array is limited by the performance of individual transistors and is independent of the frequency response of the pressure sensors. The total time to access 16 x 16 transistors is about 1 s, comparable to the response time of the pressure sensor. Thus,... 

FIGURE 6.3.7 A conformable network of pressure sensors. A plastic film with organic transistors and pressure-sensitive rubber is processed mechanically to form a unique net-shaped structure, which makes a film device extendable by 25%. A magnified view of extended net structures is also shown. 

The transistor film is then mechanically processed by a numerically controlled (NC) cutting plotter or drilling machine to form the net-shaped structures, as shown in Figure 6.3.8. In a similar way, a pressure-sensitive rubber sheet and a copper electrode suspended by a polyimide film are cut separately to form net-shaped structures. These two films are laminated on the top of the transistor fihn to complete the pressure sensor network. The periodicity is 4 mm, and the width of the struts is 0.3-0.5 mm. 

X-743. [Neville] Aromatic plasticizer for adhesives (mastfo, pressure sensitive), rubber (cements, mechanical and molded goo, tires), and caulking compds. 

Fig. 6.10. (a) Cross section of a pressure sensor (b) pressure sensor comprising an organic FET active matrix, a pressure-sensitive rubber, and a PEN film with a Cu electrode. A magnified image of the active matrix is also shown (c) micrograph of stand-alone pentacene FETs (d) circuit diagram of a stand-alone pressure sensor cell. Reprinted with permission from [25]. Copyright 2006, American Institute of Physics... 

Chem. Descrip. Glyceryl rosinate CAS 8050-31-5 EINECS/ELINCS 232-482-5 Uses Resin for lacquers, varnishes, adhesives wax modifier tackifier in pressure-sensitive rubber-based adhesives, in solv. and emulsbn types, in EA/A resin wax hot-melt adhesives and coatings modifier (contributes hardness, rapid drying, and resistance to water and alkali) in varnishes improves clarity as a wax modifier Features Pale thermoplastic... 

Typical adhesives in each class are Liquids 1. Solvent—polyester, vinyl, phenolics acrylics, rubbers, epoxies, polyamide 2. Water—acrylics, rubber-casein 3. Anaerobics—cyanoacrylate 4. Mastics—rubbers, epoxies 5. Hot melts-polyamides, PE, PS, PVA 6. Film—epoxies, polyamide, phenolics 7. Pressure-sensitive—rubbers. 

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