Effects of Helical Chain Shape on Lamellae-Forming Block Copolymer Self-Assembly

Effects of Helical Chain Shape on Lamellae-Forming Block Copolymer Self-Assembly
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螺旋链形状对片层形成嵌段共聚物自组装的影响

DOI:
10.1021/acs.macromol.9b00211
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发表时间:
2019
期刊:
影响因子:
5.5
通讯作者:
R. Segalman
R. Segalman
中科院分区:
化学1区
文献类型:
--
作者:
Beihang Yu;S. Danielsen;Anastasia Patterson;E. Davidson;R. Segalman

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了解非理想聚合物链形状对嵌段共聚物自组装的影响对于设计具有可控自组装行为的功能材料(例如生物聚合物或共轭聚合物)是重要的。虽然嵌段共聚物中的螺旋链形状已被证明产生独特的形态,但链螺旋度如何影响自组装热力学的细节仍然不清楚。在这里,我们利用模型线圈线圈和线圈螺旋嵌段共聚物的基础上的多肽,其中的链形状可以从螺旋调整到线圈通过单体手性与其他恒定的化学。该模型嵌段共聚物体系用于探讨链螺旋度对嵌段共聚物自组装热力学的影响。小角X-射线散射的块体材料表明,嵌段共聚物形成有序的层状结构。当具有相同的微区间距时,螺旋-卷曲嵌段共聚物显示出较低的有序-无序转变温度(TODT)。
Understanding the effects of nonideal polymer chain shapes on block copolymer self-assembly is important for designing functional materials, such as biopolymers or conjugated polymers, with controlled self-assembly behavior. While helical chain shapes in block copolymers have been shown to produce unique morphologies, the details of how chain helicity influences the thermodynamics of self-assembly are still unclear. Here, we utilize model coil–coil and coil–helix block copolymers based on polypeptoids, for which the chain shape can be tuned from helix to coil via monomer chirality with otherwise constant chemistry. This model block copolymer system is used to probe the effects of chain helicity on the thermodynamics of block copolymer self-assembly. Small-angle X-ray scattering of the bulk materials shows that the block copolymers form well-ordered lamellar structures. While having identical domain spacing, the coil–helix block copolymer displays a lower order–disorder transition temperature (TODT) than i...
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