Morphology of Model Graft Copolymers with Randomly Placed Trifunctional and Tetrafunctional Branch Points
Morphology of Model Graft Copolymers with Randomly Placed Trifunctional and Tetrafunctional Branch Points
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DOI：
10.1021/ma980858x
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发表时间：
1998-10
期刊：
影响因子：
5.5
通讯作者：
M. Xenidou;F. Beyer;N. Hadjichristidis;S. Gido;N. B. Tan
中科院分区：
文献类型：
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作者：
M. Xenidou;F. Beyer;N. Hadjichristidis;S. Gido;N. B. Tan
用透射电子显微镜（TEM）和小角X射线散射（SAXS）研究了两个系列模型接枝共聚物的形态。这两个系列的材料都具有单分散聚丁二烯（PB）主链和单分散聚苯乙烯（PS）接枝嵌段。在一个系列中，平均有五个三官能连接点沿PB主链沿着随机分布。每个连接点将一个PS块移植到主链上。在另一系列中，平均有四个四官能连接点沿PB主链沿着随机分布。每个连接点将两个PS嵌段移植到主链上。一系列的整体PB和PS体积分数进行了研究。这些材料模拟了一种受控的和已知程度的建筑混乱。目前的理论不能严格预测这些复杂分子结构的形态学行为。然而，它被发现，现有的理论的近似扩展，利用构成嵌段共聚物（fundam…
The morphologies of two series of model graft copolymers were studied using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). Both series of materials have monodisperse polybutadiene (PB) backbones and monodisperse polystyrene (PS) graft blocks. In one series there are on average five trifunctional junction points randomly distributed along the PB backbone. Each junction point grafts one PS block to the backbone. In the other series there are on average four tetrafunctional junction points randomly distributed along the PB backbone. Each junction point grafts two PS blocks to the backbone. A range of overall PB and PS volume fractions was investigated for both series. These materials simulate a controlled and known degree of architectural disorder. Current theory cannot rigorously predict the morphological behavior for these complex molecular architectures. However, it is found that an approximate extension of existing theory utilizing the constituting block copolymer (fundam...