ナノサイズ結晶の融解挙動 : その2. 高分子結晶の融点

概要

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It has been pointed out that polymer crystals which are of nanosize by nature do not show the melting point lowering inherent to their size as the ice in nanopore surely did as described in Part 1, because of the inevitable reorganization of the original crystal to larger size during DSC-heating. γ-ray irradiating of nylon 6 and 66 in gaseous acetylene provided an effective technique to prevent such reorganization. Thus obtained DSC curve of the sample gave the true melting point of the original crystal.It has been clarified quantitatively that the double melting peaks of nylon 6 are the result of superposition of three processes which occur successively during heating: perfection of the original crystal, melting of the perfected crystal concurrently with recrystallization, and final melting of the recrystallized crystal.