借助Drago R S方程,采用反相气相色谱法(IGC)表征了丁羟四组元(AP/RDX/Al/HTPB)推进剂主要组分的表面酸碱性参数,计算出了主要组分间的界面酸碱作用焓ΔHAB。结果表明,BA键合剂与AP、RDX的界面作用焓显著大于HTPB聚氨酯基体与AP、RDX的...借助Drago R S方程,采用反相气相色谱法(IGC)表征了丁羟四组元(AP/RDX/Al/HTPB)推进剂主要组分的表面酸碱性参数,计算出了主要组分间的界面酸碱作用焓ΔHAB。结果表明,BA键合剂与AP、RDX的界面作用焓显著大于HTPB聚氨酯基体与AP、RDX的界面作用焓,也显著大于BA键合剂与HTPB聚氨酯基体的作用焓,据此可预估BA键合剂可优先吸附在固体填料表面。因此,BA键合剂能大大提高推进剂基体/填料的界面粘接强度。展开更多
Inverse gas chromatographic technique(IGC) was attempted as a new approach to follow the chem-ical changes that occur during lubricating base oil oxidation.Three groups of the oxidized base oils were pre-pared at diff...Inverse gas chromatographic technique(IGC) was attempted as a new approach to follow the chem-ical changes that occur during lubricating base oil oxidation.Three groups of the oxidized base oils were pre-pared at different oxygen flow rates,periods and temperatures according to IP48method.The corrected reten-tion volumes(VR) were calculated for a series of selected test solutes possessing different functional groups onthe oxidized base oils used as stationary phases.Kovats retention index(I),Flory-Huggins interaction parame-ter(κ1∞,2),and partial molar free energy of solution(ΔGL∞),were calculated for the given test solutes fromtheirVR.The relationships between theIvalues and the oxidation variables were plotted and discussed.Theobtained results were confirmed by potentiometric titration.The study reveals that the magnitudes of variationofI,κ1∞,2orΔG∞Lretention parameters depend on the oxidation degree of the base oil.Large differences be-tween theIvalues permit discrimination between the different oxidation steps.Key words: inverse gas chromatography(IGC);oxidation;lubricating base oil;Kovats retention展开更多
文摘借助Drago R S方程,采用反相气相色谱法(IGC)表征了丁羟四组元(AP/RDX/Al/HTPB)推进剂主要组分的表面酸碱性参数,计算出了主要组分间的界面酸碱作用焓ΔHAB。结果表明,BA键合剂与AP、RDX的界面作用焓显著大于HTPB聚氨酯基体与AP、RDX的界面作用焓,也显著大于BA键合剂与HTPB聚氨酯基体的作用焓,据此可预估BA键合剂可优先吸附在固体填料表面。因此,BA键合剂能大大提高推进剂基体/填料的界面粘接强度。
文摘Inverse gas chromatographic technique(IGC) was attempted as a new approach to follow the chem-ical changes that occur during lubricating base oil oxidation.Three groups of the oxidized base oils were pre-pared at different oxygen flow rates,periods and temperatures according to IP48method.The corrected reten-tion volumes(VR) were calculated for a series of selected test solutes possessing different functional groups onthe oxidized base oils used as stationary phases.Kovats retention index(I),Flory-Huggins interaction parame-ter(κ1∞,2),and partial molar free energy of solution(ΔGL∞),were calculated for the given test solutes fromtheirVR.The relationships between theIvalues and the oxidation variables were plotted and discussed.Theobtained results were confirmed by potentiometric titration.The study reveals that the magnitudes of variationofI,κ1∞,2orΔG∞Lretention parameters depend on the oxidation degree of the base oil.Large differences be-tween theIvalues permit discrimination between the different oxidation steps.Key words: inverse gas chromatography(IGC);oxidation;lubricating base oil;Kovats retention
