Low-Temperature Tensile Properties of Polyethylene Terephthalate Multifiber Yarn and Polystyrene Foam
Polystyrene foam has been used extensively as an insulating material in cryogenic applications. In many uses, knowledge of the temperature dependence of the tensile strength and modulus is beneficial. Foam properties are dependent on density, the method of forming (mold or extrusion), and, very probably, on the conditions of forming . Such condition variables for foam formed by a molding process include pressure, temperature, and mold atmosphere. The foam data reported in this study were produced by a newer process, using dry nitrogen gas and pre-expanded polystyrene beads. The tensile data indicate that this type of polystyrene foam is considerably stronger than any previously examined [1–6]. A fundamental variable of foams is the density. Room-temperature data of Phillips and Lannon , Brown , Cooper [5,6], and others (see Table I) indicate that both the elastic modulus and tensile strength linearly increase as the density is increased.
KeywordsPolyethylene Terephthalate Polystyrene Foam Tensile Data Tensile Result Foam Property
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