Phase separation of polymer blends in solution: A case study

被引：11

作者：

Mannella, Gianluca A. ^{[1
]}

Pavia, Francesco Carfi ^{[1
]}

La Carrubba, Vincenzo ^{[1
]}

Brucato, Valerio ^{[1
]}

机构：

[1] Univ Palermo, Dipartimento Ingn Civile Ambientale Aerosp Mat DI, Viale Sci,Ed 8, I-90128 Palermo, Italy

来源：

EUROPEAN POLYMER JOURNAL | 2016年 / 79卷

关键词：

Phase separation; Polymer solution; Polymer blend; Morphology; MEMBRANE-FORMING SYSTEM; POLY(L-LACTIC ACID) SCAFFOLDS; EQUILIBRIUM THERMODYNAMICS; SPINODAL DECOMPOSITION; TERNARY-SYSTEM; DIOXANE-WATER; KINETICS; BEHAVIOR; SOLVENT; GROWTH;

D O I：

10.1016/j.eurpolymj.2016.04.025

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The phase behavior and phase separation features of the quaternary system poly-L-lactide (PLLA)/poly-rac-lactide (PLA)/dioxane/water were investigated. Experiments were performed with fixed total polymer concentration of 6 wt%, by varying the PLLA/PLA weight ratio. Blend weight compositions examined were 100/0, 80/20, 50/50, 20/80 and 0/100, at fixed dioxane/water weight ratio (87/13). Cloud point measurements reported that the demixing temperatures of blends are close to PLLA in the same mixed solvent, in line with the calculated spinodals. As regards to foam preparation, above the PLA cloud point, morphology is similar to pure PLLA foams; conversely, below PLA cloud point, the morphology resulted highly inhomogeneous. This behavior could be related to a change in equilibrium conditions occurring close to PLA cloud point. The equilibrium measurements performed, gave out results in line with this hypothesis. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：176 / 186

页数：11

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