本研究使用高壓震盪管密度儀分別測量寡聚物溶液在溫度介於298.15 K-348.15 K，壓力高達50 MPa的密度數據，這些混合物包含了由兩種溶劑茴香醚與苯乙酮和兩種寡聚物聚乙二醇單月桂酸酯與聚乙二醇壬基苯基醚所組成的四組雙成分系統。實驗所量取的密度數據，均可用Tait模式和一半經驗模式準確關聯。
由實驗所得之密度數據，計算出不同條件下之過剩體積。苯乙酮＋聚乙二醇壬基苯基醚系統過剩體積與組成之關係圖呈現S形狀。茴香醚＋聚乙二醇單月桂酸酯和苯乙酮＋聚乙二醇單月桂酸酯在整個組成範圍之過剩體積皆為負值。茴香醚＋聚乙二醇壬基苯基醚在所有組成範圍的過剩體積為正值。這些混合物在定溫及定壓條件下之過剩體積與組成之關係可用Redlich-Kister模式表示。
實驗所量取之雙成分PVT數據均用FOV (Flory-Orwoll-Vrij)與Schotte狀態方程式關聯，各系統之雙成分交互作用參數分別由雙成分之 PVT 數據，擬合狀態方程式訂定。

In this study, we used a high-pressure vibrating tube densimeter
to measure the densities of oligomeric solutions at temperatures from 298.15 K to 348.15 K and pressures up to 50 MPa. The investigated mixtures included four binary systems containing two solvents : anisole and acetophenone and two oligomeric materials : polyethylene glycol mono-laurate (PEGML) and polyethylene glycol mono-4-nonylphenyl ether (PEGNPE). The Tait equation and a semi-empirical model can correlate accurately the experimental density data over the entire
pressure range.

The excess volumes were calculated from the experimental density
data. It was found that the excess volumes varied with composition in
an S shape for acetophenone + PEGNPE. Over the entire composition range, the excess volumes are negative for anisole + PEGML and acetophenone + PEGML mixtures, and positive for anisole + PEGNPE. The Redlich-Kister model represented well the excess volumes varying
with composition at specific temperature and pressure.

The FOV (Flory-Orwoll-Vrij) and the Schotte equations of state
were also employed to correlate the PVT data. The binary interaction
parameter for each binary system was determined by fitting the binary
PVT data to the equations of state.

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