The cloud point and the liquid-liquid equilibrium behaviors of L31∖L61-K₂CO₃∖C₄H₄O₆K₂ aqueous two-phase systems at different temperatures

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• 作者：Baodong An^a ; Yanli Mao^b ; Wenli Zhang^a ; ^{wlzhang@ujs.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Juan Han^c ; ^{hanjuan@ujs.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yun Wang^a ; Liang Ni^a
• 关键词：L31 ; L61 ; The cloud point ; The liquid-liquid equilibrium
• 刊名：Fluid Phase Equilibria
• 出版年：2016
• 出版时间：15 October 2016
• 年：2016
• 卷：425
• 期：Complete
• 页码：57-64
• 全文大小：2022 K

文摘

The cloud point (CP) of triblock copolymer L31 (Mn = 1100 g mol⁻¹) and L61 (Mn = 2100 g mol⁻¹) solutions was determined in the absence and presence of two salting-out salts (K₂CO₄, C₄H₄O₆K₂) at different concentrations. The results show that the addition of K₂CO₃ and C₄H₄O₆K₂ decreases the CP of copolymer solutions and the increase in the molecular weight can also decrease the CP of copolymer solutions. The anions order to decreases the CP of L31 or L61 is as follows: class="mathmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0378381216302382&_mathId=si1.gif&_user=111111111&_pii=S0378381216302382&_rdoc=1&_issn=03783812&md5=8827d9513b8e422fea1a2fa1672e469b">class="imgLazyJSB inlineImage" height="18" width="112" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0378381216302382-si1.gif">class="mathContainer hidden">class="mathCode">${\text{CO}}_3^{2-}>{\text{C}}_4{\text{H}}_4{\text{O}}_6^{2-}$. Meanwhile the liquid-liquid equilibrium (LLE) data for L31/L61-K₂CO₃/C₄H₄O₆K₂ ATPSs was measured at three temperatures (273.15, 278.15 and 283.15) K. An increase in temperature causes an increase in the slope of the tie-line (STL) and the tie line length (TLL). A significant alteration in the biphasic area for the temperature ranging from (273.15–283.15) K is observed. The anions order to induce the phase-separation for systems containing L31 or L61 is as follows: class="mathmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0378381216302382&_mathId=si1.gif&_user=111111111&_pii=S0378381216302382&_rdoc=1&_issn=03783812&md5=8827d9513b8e422fea1a2fa1672e469b">class="imgLazyJSB inlineImage" height="18" width="112" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0378381216302382-si1.gif">class="mathContainer hidden">class="mathCode">${\text{CO}}_3^{2-}>{\text{C}}_4{\text{H}}_4{\text{O}}_6^{2-}$. The two-phase region in the phase diagram also expands with the increase of the molecular weight of copolymer.