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首页> 外文期刊>Chemistry of Materials: A Publication of the American Chemistry Society >Importance of Critical Molecular Weight of Semicrystalline n-Type Polymers for Mechanically Robust, Efficient Electroactive Thin Films
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Importance of Critical Molecular Weight of Semicrystalline n-Type Polymers for Mechanically Robust, Efficient Electroactive Thin Films

机译：用于机械鲁棒，高效电活性薄膜的半结晶N型聚合物的临界分子量的重要性

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Mechanical properties of conducting polymers are an essential consideration in the design of flexible and stretchable electronics, but the guidelines for the material design having both high mechanical and electrical properties remain limited. Here we provide an important guideline for the design of mechanically robust, electroactive polymer thin films in terms of the molecular weight of the polymers. These studies based on a highly efficient, representative n-type conjugated polymer (P(NDI2OD-T2)) revealed a marked enhancement in mechanical properties across a narrow molecular weight range, highlighting the existence of a critical molecular weight that can be exploited to engineer films that balance processability and mechanical and electronic properties. We found the thin films formed from high molecular weight polymers (i.e., number-average molecular weight (M-n) similar to 163 kg mol(-1)) to exhibit superior mechanical compliance and robustness, with a 114-fold enhanced strain at fracture and a 2820-fold enhanced toughness, as compared to those of low molecular weight polymer films (M-n = 15 kg mol(-1)). In particular, we observed a jump in the mechanical properties between the M-n = 48 and 103 kg mol(-1), yielding a 26-fold enhanced strain at fracture and a 160-fold enhanced toughness. The significant improvement of tensile properties indicates the presence of a critical molecular weight at which entangled polymer networks start to form, as supported by the analysis of the thermal and crystalline properties, specific viscosity, and microstructure. Our work provides useful guidelines for the design of conjugated polymers with recommendations for the best combinations of mechanical robustness and electrical performance for flexible and stretchable electronics.
机译：导电聚合物的机械性能是柔性且可伸缩电子的设计中的基本考虑因素，但是具有高机械和电性能的材料设计的准则保持有限。在这里，我们提供了在聚合物的分子量方面设计机械稳健，电活性聚合物薄膜的重要指导。这些研究基于高效，代表性的N型缀合聚合物（P（NDI2OD-T2））揭示了窄分子量范围内的机械性能的显着增强，突出了可以被利用给工程师的临界分子量的存在电影平衡可加工性和机械和电子性质。我们发现由高分子量聚合物形成的薄膜（即，与163kg摩尔（-1）类似的数均分子量（Mn））形成，以表现出优异的机械顺应性和鲁棒性，在骨折和骨折上具有114倍的增强菌株与低分子量聚合物膜（Mn = 15kg摩尔（-1））相比，增强韧性2820倍。特别地，我们观察到M-N = 48和103 kg摩尔（-1）之间的机械性能跳跃，在裂缝处产生26倍的增强菌株和160倍的增强韧性。拉伸性能的显着改善表明存在缠结的聚合物网络开始形成的临界分子量的存在，通过分析热和结晶性质，特异性粘度和微观结构的支持。我们的作品提供了有用的结合聚合物设计指导，提出了用于柔性和可伸缩电子的机械稳健性和电气性能的最佳组合。

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