Temperature-Dependent Order-to-Order Transition of Polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene Triblock Copolymer under Multilayered Confinement,Macromolecules

当前位置： X-MOL 学术 › Macromolecules › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Temperature-Dependent Order-to-Order Transition of Polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene Triblock Copolymer under Multilayered Confinement
Macromolecules ( IF 5.1 ) Pub Date : 2018-03-02 00:00:00 , DOI: 10.1021/acs.macromol.7b02651
Xiao Tan ₁ , Jiang Li ₁ , Shaoyun Guo ₁

Affiliation

The order-to-order transition (OOT) plays a key role in the nanotechnological applications of block copolymer (BCP) and is dramatically dependent on the spatial environment. A multilayer-confined space has been fabricated by layer-multiplying coextrusion technology to investigate the OOT mechanism of polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene triblock copolymer (SEBS) under multilayered confinement. The parallel oriented ordering front, whose OOT temperature is lower than that of the bulk due to higher free energy, is induced by the “substrate surface effect” in the SEBS layers of the multilayer specimens. The OOT temperature of SEBS is mainly decided by the volume fraction of ordering front. The propagation distance maximum of the “substrate surface effect” is about 220 nm. Only when the thickness of SEBS layer is less than this critical value is the whole SEBS layer fully filled with the ordering front. As a result, the OOT temperature first decreases rapidly and then tends to be a constant value with the decrease of layer thickness. This turning point of layer thickness is found to locate around 220 nm. Finally, the change of transition temperature region with the layer thickness has been explained by the fact that the bulk, thin layer samples (less than turning point) and thick layer samples (more than turning point) have different OOT mechanisms.

中文翻译：

温度依赖性订单到订单聚苯乙烯的过渡块-聚（乙烯-共-丁烯） -嵌段下多层禁闭聚苯乙烯三嵌段共聚物

阶跃转变（OOT）在嵌段共聚物（BCP）的纳米技术应用中起着关键作用，并且极大地依赖于空间环境。一种多层-密闭空间已经制造由层倍增共挤技术调查聚苯乙烯的OOT机构块-聚（乙烯-共-丁烯） -嵌段-聚苯乙烯三嵌段共聚物（SEBS）在多层约束下。平行取向的有序前沿，由于较高的自由能，其OOT温度低于整体温度，这是由多层样品的SEBS层中的“衬底表面效应”引起的。SEBS的OOT温度主要由订货前的体积分数决定。“基板表面效应”的最大传播距离约为220nm。只有当SEBS层的厚度小于此临界值时，整个SEBS层才会完全充满有序前端。结果，随着层厚度的减小，OOT温度首先迅速下降，然后趋于为恒定值。发现该层厚度的转折点位于约220nm处。最后，

更新日期：2018-03-02

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11