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The hydrolyzed product of the hydrolysis of this starch-acrylonitrile co-polymer gave water absorption greater than 400 times its weight. Also, the gel did not release liquid water the way that fiber-based absorbents do. The polymer came to be known as “Super Slurper”. [10]
As seen in the table below, Nylon 11 has lower values of density, flexural and Young's modulus, water absorption, as well as melting and glass transition temperatures. Nylon 11 is seen to have increased dimensional stability in the presence of moisture due to its low concentration of amides. Nylon 11 experiences 0.2-0.5% length variation and 1. ...
Notch test 2–5 kJ/m 2: ... Water absorption (ASTM) ... Almost one third of plastic-based medical devices are made from PVC. [44] Food packaging
in the condensation of the water-vapour of the air on the cold surface of a glass; in the capillarity of hair, wool, cotton, wood shavings, etc.; in the imbibition of water from the air by gelatine; in the deliquescence of common salt; in the absorption of water from the air by concentrated sulphuric acid; in the behaviour of quicklime". [4]
ASTM D1434 - Standard Test Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting; ASTM D3079 - Standard Test Method for Water Vapor Transmission of Flexible Heat-Sealed Packages for Dry Products; ASTM D4279 - Standard Test Methods for Water Vapor Transmission of Shipping Containers-Constant and Cycle Methods
PMMA has a maximum water absorption ratio of 0.3–0.4% by weight. [16] Tensile strength decreases with increased water absorption. [21] Its coefficient of thermal expansion is relatively high at (5–10)×10 −5 °C −1. [22]
Test procedure used Value Specific gravity: ASTM D792 2.22 Hardness ASTM D2240 60 - 75 Shore D: Water absorption ASTM D570 0 Tensile strength: ASTM D4894 2,000 psi (14 MPa) Elongation ASTM D4894 175% Deformation under load 1500 psi, 24 hr, RT ASTM D621 5.0% Izod impact strength n/a 6.0 ft-lb/in (320 J/m) Thermal conductivity: ASTM D2214
From the kinetic results, the rate of water uptake and water diffusion coefficients can be determined. The equilibrium mass values at the end of each humidity step were used to calculate the sorption and desorption isotherms (Figure 1b). The difference in water vapor uptake between the sorption and desorption isotherms is called the hysteresis ...