Mechanical Properties and Swelling Behaviors of Ultrathin Chemically Cross-Linked Polybutadiene Films
Mechanical Properties and Swelling Behaviors of Ultrathin Chemically Cross-Linked Polybutadiene Films
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超薄化学交联聚丁二烯薄膜的机械性能和溶胀行为
DOI：
10.1021/acs.macromol.3c00126
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发表时间：
2023
期刊：
影响因子：
5.5
通讯作者：
Yokoyama Hideaki
中科院分区：
文献类型：
--
作者：
Saito Masayuki;Yamada Norifumi L.;Ito Kohzo;Yokoyama Hideaki
随着纳米科学和纳米技术的进步，了解超薄聚合物薄膜独特的机械性能变得越来越重要。我们报告了超薄化学交联聚丁二烯薄膜的机械性能和溶胀行为。减少薄膜厚度后，杨氏模量增加，并观察到不寻常的应力松弛行为。应力松弛后，完全松弛模量明显高于根据交联剂添加量和缠结度预期的值。在基底上制备的超薄膜的面外膨胀与本体相当，而漂浮在水面上的薄膜的面内膨胀被显着抑制。这种面内变形的抑制可能归因于作为假交联点的界面处捕获的链和链段的界面诱导取向的影响。这项研究有助于了解超薄交联弹性体薄膜的物理性能。
With the advancement of nanoscience and nanotechnology, understanding the unique mechanical properties of ultrathin polymer films is becoming increasingly important. We report the mechanical properties and swelling behaviors of ultrathin chemically cross-linked polybutadiene films. Upon reducing the film thickness, the Young’s modulus increased, and an unusual stress-relaxation behavior was observed. After stress relaxation, the fully relaxed modulus was significantly higher than that expected from the amount of added cross-linker and the entanglement degree. The out-of-plane swelling of the ultrathin films prepared on a substrate was comparable to that in the bulk, whereas the in-plane swelling of films floating on water was significantly suppressed. Such suppression of the in-plane deformation may be attributed to the effects of interface-induced orientations of the chains and the chain segments trapped at the interfaces acting as pseudo-cross-linking points. This study contributes to an understanding of the physical properties of ultrathin cross-linked elastomer films.