Bending moduli and stability of copolymer bilayers
Bending moduli and stability of copolymer bilayers
复制标题
共聚物双层的弯曲模量和稳定性
DOI：
10.1021/ma00025a043
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
L. Leibler
中科院分区：
文献类型：
--
作者：
A. Ajdari;L. Leibler
N\/(N\+ Nb)和Flory参数表征不同单体之间的有效相互作用。在这里，我们将处理强偏析限制，其中A/B界面较窄，我们重点关注相对较长的均聚物B的情况，因此它们被排除在聚集体的内部(A)和外部(B)部分之外。当共聚物不对称时，情况似乎很清楚，如果< 0.5)，小a嵌段。组织是由减少AB接触界面面积的趋势和保持聚集体中总密度恒定的必要性之间的竞争控制的，这意味着链的拉伸。因此，a /B接口倾向于弯曲，因此短a块位于内部。因此，随着共聚物对称性的增加，人们预计会出现更少的弯曲形状，即圆柱形聚集体和最终双层（层状聚集体）的近对称共聚物。9
N\/(N\+ Nb), and Flory parameter characterizing effective interactions between unlike monomers. Here, we will deal with the strong segregation limit where the A/B interfaces are narrow, and we focus on the case of relativelylong homopolymers B, which are thus excluded from both inner (A) and outer (B) parts of the aggregates.The situation seems to be clear when the copolymer is asymmetric with a small A block if< 0.5). The organization is controlled by the competition between the tendency to decrease the interfacial area of AB contacts and the necessity to keep the overall density constant in the aggregate, which implies stretching of the chains. As a result the A/B interfaces tend to curve so that the short A block is located on the inside. Hence, as the copolymer symmetry increases, one expects less curved shapes to occur, namely, cylindrical aggregates andeventually bi-layers (lameliarlike aggregates) for nearly symmetric copolymers. 9