Diblock Rings as Topological Adhesives at Immiscible Polymer Interfaces,ACS Macro Letters

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Diblock Rings as Topological Adhesives at Immiscible Polymer Interfaces
ACS Macro Letters ( IF 5.1 ) Pub Date : 2024-09-18 , DOI: 10.1021/acsmacrolett.4c00446
Andrew Wijesekera ₁ , Daniel L Vigil ₂ , Gary S Grest ₂ , Siteng Zhang ₁ , Ting Ge ₁

Affiliation

Disparate polymers often do not mix well, and the resulting immiscible interfaces are mechanically weaker than the bulk, which is undesirable for many technological applications. Large-scale molecular simulations are performed to demonstrate the effectiveness of diblock ring polymers as a new type of adhesive for immiscible polymer interfaces. The peak stress σ_p and the failure strain γ_p upon shear deformation approach the bulk values with increasing diblock ring length and coverage. Breaking the diblock rings into pairs of diblock linear chains creates a reference system for comparison. The diblock rings increase both σ_p and γ_p compared to the diblock linear chains at the same coverage. Further topological analysis based on the Gauss Linking Number reveals that the threading of diblock rings by linear chains from the two opposite sides is the key mechanism for stronger adhesion, which is analogous to the hook-and-loop process in Velcro tape.

中文翻译：

二嵌段环作为不混溶聚合物界面的拓扑粘合剂

不同的聚合物通常不能很好地混合，并且由此产生的不混溶界面在机械上比本体弱，这对于许多技术应用来说是不可取的。进行大规模分子模拟以证明二嵌段环聚合物作为不混溶聚合物界面的新型粘合剂的有效性。剪切变形时峰值应力 σ_p 和破坏应变 γ_p 随着二嵌段环长度和覆盖范围的增加而接近本体值。将二嵌段环分解成对的二嵌段线性链可创建一个用于比较的参考系统。在相同覆盖率下，与二嵌段线性链相比，二嵌段环增加了 σ_p 和 γ_p。基于高斯连接数的进一步拓扑分析表明，线性链从两个相对的侧面穿入二嵌段环是获得更强粘合力的关键机制，这类似于威扣胶带中的钩环工艺。

更新日期：2024-09-18

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