Phase Behavior of Ternary Homopolymer/Gradient Copolymer Blends
Phase Behavior of Ternary Homopolymer/Gradient Copolymer Blends
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DOI：
10.1021/ma801398a
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发表时间：
2009-02
期刊：
影响因子：
5.5
通讯作者：
Rui Wang;Weihua Li;Yingwu Luo;Bo-geng Li;A. Shi;Shiping Zhu
中科院分区：
文献类型：
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作者：
Rui Wang;Weihua Li;Yingwu Luo;Bo-geng Li;A. Shi;Shiping Zhu
使用梯度共聚物的多嵌段模型从理论上研究了三元均聚物/梯度共聚物共混物的相行为。共混物的临界线和 Lifshitz 点由随机相位近似分析确定。使用自洽平均场理论研究了共混物的相图和微相结构。研究发现链梯度分布对共混物的相行为具有显着影响。当链梯度分布是渐变的时，形成微相需要更大量的共聚物和更高的不相容性。此外，随着梯度分布逐渐变化，共聚物域吸收均聚物的能力降低，而共聚物在均聚物基质中的溶解度增加。另一个重要的作用是梯度共聚物在两种不相容的聚合物之间产生广泛的界面。这些结果表明，这些共混物的界面结构和形态可以通过专门设计的梯度分布进行微调。
The phase behavior of ternary homopolymer/gradient copolymer blends is studied theoretically using a multiblock model of gradient copolymers. Critical lines and Lifshitz points of the blends are determined by a random phase approximation analysis. Phase diagrams and microphase structures of the blends are studied using self-consistent mean-field theory. It is discovered that the chain gradient distribution has a significant effect on the phase behavior of the blends. When the chain gradient distribution is gradual, a larger amount of copolymers and a higher incompatibility are needed for the formation of a microphase. In addition, the ability of copolymer domains to absorb homopolymers decreases, whereas the solubility of copolymers in homopolymer matrix increases, as the gradient distribution becomes gradual. Another important effect is that gradient copolymers lead to a broad interface between two incompatible polymers. These results indicate that interfacial structure and morphology of these blends can be fine-tuned by specifically designed gradient distributions.