New partially fluorinated polyol esters were synthesized by condensation reaction of polyols (NPG and TMP) and carboxylic acids such as 2-ethylhexanoic acid, stearic acid and perfluorooctanoic acid. The structures of polyol esters were confirmed by FT-IR and ^1H-NMR. And, the fluorinated polyol esters were insoluble in several oils, however the partially fluorinated polyol esters were soluble in several oils depending on the structures of polyol esters. The physical properties such as 4-ball wear properties and extreme-pressure (EP) properties were characterized by ASTM D 2266 and by ASTM D 2783 method, respectively. As the results, wear scar diameters of oils in which the semi-fluorinated polyol esters were added were not changed compared to those of non-added oils. On the contrary, extreme-pressure properties remarkably increased with fluorine contents of the esters and were affected by the structure of acid moiety and polyol moiety. Also, the extreme-pressure property of semi-fluorinated NPG polyol ester in gasoline engine oil was better than that of commercial Teflon coating additive.

2-에틸헥실 카르복실산, 스테아린산 및 퍼플루오르옥틸 카르복실산을 NPG 및 TMP의 폴리올과 축합반응하여 새로운 불소계 폴리올 에르테르를 합성하여 ^1H-NMR과 FT-IR 스펙트라로 구조를 확인하였다. 퍼플루오르옥틸 카르복실산으로 합성한 폴리올 에스테르는 오일에 대한 용해성이 전혀 없었으며 2-에틸헥실 카르복실산과 혼합하여 합성한 부분-불소화 폴리올 에스테르는 구조에 따라 용해성의 차이를 나타내었다. ASTM D 2266과 ASTM D 2783에 의해 4구 마모성능과 극압성능을 관찰한 결과, 4구 마모성능은 부분-불소화 폴리올에스테르를 첨가하여도 별 효과를 관찰하지 못하였지만 극압성능은 불소 함량이 증가함에 따라 현저히 향상되었으며 폴리올 에스테르의 구조에 따라 차이를 나타내었다. 또한, 부분-불소화 폴리올 에스테르를 가솔린 엔진오일에 첨가하여 극압성능을 시험한 결과 비교 제품인 테프론 입자를 첨가하였을 때보다 우수한 극압성능을 나타내었다.