The phase behavior of comblike block copolymer A(m+1)B(m)/homopolymer A mixtures.
The phase behavior of comblike block copolymer A(m+1)B(m)/homopolymer A mixtures.
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DOI：
10.1063/1.2835609
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
Xianggui Ye;Zhao‐Yan Sun;Hong-Fei Li;L. An;Z. Tong
中科院分区：
文献类型：
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作者：
Xianggui Ye;Zhao‐Yan Sun;Hong-Fei Li;L. An;Z. Tong
采用随机相近似方法和实空间自洽场理论研究了梳状嵌段共聚物A(m+1)B(m)/均聚物A的相行为。从大相分离和微相分离的spinodals可以发现，接枝数量和均聚物A的长度对共混物的相行为有很大的影响。对于一定组成的梳状嵌段共聚物，增加接枝数量不会改变大相分离的旋轴曲线，但会减小微相分离区域。少量长链均聚物a的加入增加了梳状嵌段共聚物/均聚物a混合物的微相分离。而短链均聚物A的加入会使梳状嵌段共聚物/均聚物A混合物的相分离区减小。双嵌段共聚物形成的微观结构比梳状嵌段共聚物形成的微观结构更容易被均聚物膨胀。这可以归因于梳状嵌段共聚物和线状嵌段共聚物之间的结构差异。
The phase behaviors of comblike block copolymer A(m+1)B(m)/homopolymer A mixtures are studied by using the random phase approximation method and real-space self-consistent field theory. From the spinodals of macrophase separation and microphase separation, we can find that the number of graft and the length of the homopolymer A have great effects on the phase behavior of the blend. For a given composition of comblike block copolymer, increasing the number of graft does not change the macrophase separation spinodal curve but decreases the microphase separation region. The addition of a small quantity of long-chain homopolymer A increases the microphase separation of comblike block copolymer/homopolymer A mixture. However, the addition of short-chain homopolymer A will decrease the phase separation region of comblike block copolymer/homopolymer A mixture. It is also found that the microstructure formed by diblock copolymer is easier to be swelled by homopolymer than that formed by comblike block copolymer. This can be attributed to the architecture difference between the comblike block copolymer and linear block copolymer.