高分子材料のトライボロジー特性に及ぼす超舝界二酸化炭素の影響（第3報）: 超舝界二酸化炭素の溶媒特性と高分子材料への潤滑油成分の含浸特性

摘要

Supercritical fluids offer specific dissolution properties. Polymers become impregnated with lubricating oil when polymers are maintained together with lubricants and supercritical carbon dioxide (scCO_2) environment under prescribed pressure and temperature conditions. In this study, the relationship between the amount of solute lubricant in carbon dioxide (CO_2) and the amount of retained oil in polymer, and the relationship between the temperature of scCO_2 and the amount of retained oil in polymer were studied. The amount of solute lubricant in CO_2 was varied by stirring the contents inside the high-pressure vessel and installing the inlet of CO_2 flow in the oil reservoir. It was found that the amount of retained lubricant in POM (polyacetal) increases when the amount of solute lubricant in CO_2 increases. When POM surface was drenched with lubricant in scCO_2, lubricant was impregnated effectively into POM owing to oil rich area formed around POM.%超臨界二酸化炭素（以下scCO_2と記す）は，特rn異な溶媒特性を示すことが知られており，食品用rn成分抽出などですでにその商業的実用化が達成さrnれている．また，SCCO_2を高分子材料に溶解さrnせると，二酸化炭素が可塑剤となり高分子材料のrn結晶化が促進されたり，従来見られないような低rnい温度で結晶相転移が誘起されることが確認されrnている．これらの特性に着目し，本研究ではrnscco_2の溶媒特性を利用して，固体潤滑剤や構成rn部品材料として使用されている代表的な高分子トrnライボマテリアルの改質について研究してきた．