EFFECT OF IRRADIATION OF DYNAMIC MECHANICAL PROPERTIES OF 6-6 NYLON

Journal Article · Tue Oct 01 04:00:00 EDT 1957 · Journal of Applied Physics (U.S.)

DOI:https://doi.org/10.1063/1.1722591· OSTI ID:4353029

Deeley, C W; Woodward, A E; Sauer, J A

Measuremerts of elastic modulus and mechanical loss at audio-frequencies have been obtained on irradiated and nonirradiated specimens of polyhexamethylene adipamide over a broad temperatare range extending from 80 to 600 deg K. The irradiations were carried out at the Brookhaven and Penn State Reactors. The internal friction spectrum of unirradiated nylon 6-6 contains at least four peaks corresponding to different mechanisms being invoked as the temperature is raised. With irradiation doses from 0.3 x 10/sup 18/ nvt to 5.5 x 10/sup 18/ nvt, significant changes in the dispersion regions occur. At temperatures above the main softening region, an increase in modulas with temperature is found. This is evidence of rubber-like behavior and is accounted for by the introduction of cross-links resulting from ionization and free radical formation produced by the irradiation. At high irradiation doses the percent crosslinking appears to become independent of dose. The various effects found are discussed in terms of molecular forces and mobility of chain segments. (auth)

• Research Organization: Pennsylvania State Univ., University Park
• Sponsoring Organization: USDOE
• NSA Number: NSA-12-000664
• OSTI ID: 4353029
• Journal Information: Journal of Applied Physics (U.S.), Journal Name: Journal of Applied Physics (U.S.) Vol. Vol: 28; ISSN JAPIA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

DISPERSIONS
FREE RADICALS
FRICTION
IONIZATION
MECHANICAL PROPERTIES
MOBILITY
NYLON
PHYSICS
POLYMERIZATION
POLYMERS
RADIATION DOSES
RADIATION EFFECTS
REACTORS
TEMPERATURE
TENSILE PROPERTIES