Molecular Motions and Related Mechanical Relaxations in Linear Polyethylene Treated with Fuming Nitric Acid

概要

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Molecular motions and related relaxations in solid linear polyethylene degraded by fuming nitric acid were in vestigated from -170 to 100℃ by means of broad-line nuclear magnetic resonance absorption (BL-NMR) and dynamic mechanical measurements. A second-moment vs. temperature curve shows three motional processes around 80, 0 and -140℃, which were named α, β' and γ_3 in the order of descending temperature. The molecular origins of these processes are discussed on the basis of a BL-NMR study of a sample swollen with C_2Cl_4. The α-process is attributed to the motion of the chains in the lamellar core which is not affected by the acid treatment while the β'- and γ_3-processes are attributed to the motion of the cilia on lamellar surfaces produced by the acid treatment. Mechanical relaxations correspon-ding to the β'- and γ_3-processes were also observed.
社団法人応用物理学会の論文
1986-06-20