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- W2012049878 abstract "Measurements of the dynamic mechanical properties of various polymers have been made in the 6–300°K. temperature range at resonant frequencies of about 104 cycles/sec. by using a longitudinal vibration apparatus. The polymers studied include polyethylene, nylon 66, three poly(methacrylate esters), and five poly-α-olefins and related polymers. Results for poly(methyl methacrylate) and poly(ethyl methacrylate) indicate the occurrence of low temperature relaxation processes (6°K. and 52°K., respectively) involving configurational rearrangements in the hydrocarbon portion of the ester side groups. The data provide no evidence for mechanical loss processes associated with hindered rotation of the main-chain methyl groups in the poly(methacrylate esters) or polypropylene. Very weak relaxation processes or loss plateaus are observed in the 20°K. region for polypropylene, poly(vinyl chloride), poly(d,l-propylene oxide), poly(isobutyl methacrylate) and possibly nylon 66, while for poly-4-methylpentene-1 a sizeable loss peak is observed at 25°K. The mechanisms responsible for these loss peaks are not yet understood. No relaxation phenomenon is observed below 77°K. for either polyethylene or polybutene-1. For poly(d,l-propylene oxide) a loss maximum or shoulder appears at 70–120°K. which is possibly associated with chain motions accompanying the methyl reorientation process." @default.
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- W2012049878 date "1964-12-01" @default.
- W2012049878 modified "2023-10-16" @default.
- W2012049878 title "Dynamic mechanical behavior of some high polymers at temperatures from 6°K.: Polyethylene, nylon 66, polypropylene, poly(vinyl chloride), poly-(d,l-propylene oxide), polybutene-1, poly(4-methyl-pentene-1), poly(methyl methacrylate), poly(ethyl methacrylate), poly-4-methylpentene-1 and poly(isobutyl methacrylate)" @default.
- W2012049878 doi "https://doi.org/10.1002/pol.1964.100021205" @default.
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