Coexistence curve exponent of a binary mixture with a high molecular weight polymer.
Coexistence curve exponent of a binary mixture with a high molecular weight polymer.
复制标题
二元混合物与高分子量聚合物的共存曲线指数。
DOI：
10.1103/physreve.63.026108
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
K. To
中科院分区：
文献类型：
--
作者：
K. To
研究了高分子量聚合物（聚丙烯酸，PAA，M（w）=7.5 × 10 ~（5））对二元液体混合物（2，6-二甲基吡啶+水，LW）共存曲线的影响。建立了一个高精度的折射仪，以测量包含小于1 mg/cc的PAA的相分离的LW样品的两个共存相的折射率的温度依赖性。由折射率绘制了共存曲线，得到了共存两相的折射率差三角形upn。当温度T接近临界温度T（c）时，三角形n与（T-T（c））（β）成反比的临界指数β为0.41 ± 0.02，高于纯LW的临界指数β（0.31 ± 0.01）。
We studied the effects of a high molecular weight polymer (polyacrylic acid, PAA, M(w)=7.5 x 10(5)) on the coexistence curve of a binary liquid mixture (2,6-lutidine + water, LW). A high precision refractometer was built to measure the temperature dependence of the refractive indexes of the two coexisting phases of phase separated LW samples containing less than 1 mg/cc of PAA. From the refractive indexes we mapped out the coexistence curve and obtained the refractive index difference triangle upn between the two coexisting phases. At temperature T close to the critical temperature T(c), the critical exponent beta such that triangle n inversely proportional to (T-T(c))(beta) was found to be 0.41+/-0.02 which is higher than (0.31+/-0.01) that of pure LW.