Cryogenic properties of engineering plastic films

• Published in: Cryogenics (Guildford) Vol. 35; no. 11; pp. 787 - 789
• Main Authors: Yamaoka, H., Miyata, K., Yano, O.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01.11.1995; Elsevier
• Subjects: Applied sciences; dielectric properties; engineering plastic films; Exact sciences and technology; Forms of application and semi-finished materials; mechanical properties; Polymer industry, paints, wood; Sheets and films; Technology of polymers; engineering plastic films; mechanical properties; dielectric properties; Arylate polymer; Polyimide; Ester polymer; Aromatic polymer; Mechanical properties; Tensile property; Property structure relationship; Crystallinity; Experimental study; Cryogenic temperature; Dielectric relaxation
• ISSN: 0011-2275; 1879-2235
• DOI: 10.1016/0011-2275(95)90915-3

The mechanical and dielectric properties of several engineering plastic films were measured at cryogenic temperatures. The tensile strength and elongation of polyethylene-2,6-naphthalenedicarboxylate at 77 K were found to decrease with an increase in the degree of crystallinity. The peak height of dielectric loss around 230 K of this polymer also decreased with increasing degree of crystallinity, indicating that this peak is closely associated with motion in an amorphous region of the polymer. The cryogenic properties of two kinds of newly developed polyimide films were also studied. On the basis of the results obtained, the relationship between the chemical structures of polymers and their cryogenic properties are discussed.