MgOの焼結に対する微量添加物の影響, Effect of Minor Additions on Sintering of MgO, G.K. Layden, M.C. McQuarrie, J. Amer. Ceram. Soc., 42, February, 89〜92, 1959

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The rate and saturation value of water absorption were determined for nylon plastics molded in different shapes by injection molding. The degrees of crystallinity and its distribution in the specimens were estimated. The change of dielectric properties caused by water absorption and the degree of crystallinity were measured in a frequency, ranging from 50 KC/sec to 20 MC/sec. Behavior of the absorbed water and mechanism of polarization were discussed. The results are summarized as follows : 1) Water absorption gets larger in the order of nylon 610, 66,6,6/66 copolymer, and decreases by containing some additives such as graphite or metal powder. 2) Water content of nylon is proportional to the 0・4-0・5th power of time, independent of the kind of nylon, the shape of specimen, the relative humidity, etc. 3) the average degree of crystallinity gets smaller in the order of nylon 66 (37・8%), nylon 610 (30・4%), nylon 6(24・7%). 4) The dielectric properties of nylon containing water are in non-linear relation with water content. 5) At a definite temperature and a definite degree of crystallinity, the higher the water content is, the smaller the internal friction for polar groups to orientate, which the internal friction for polar groups becomes larger with the increase of crystallinity.
社団法人日本材料学会の論文
1960-01-15