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Confinement Effects on Host Chain Dynamics in Polymer Nanocomposite Thin Films
Macromolecules ( IF 5.1 ) Pub Date : 2017-09-07 00:00:00 , DOI: 10.1021/acs.macromol.7b01066 Kyle J. Johnson 1 , Emmanouil Glynos 1 , Serafeim-Dionysios Maroulas 2 , Suresh Narayanan 3 , Georgios Sakellariou 2 , Peter F. Green 1, 4
Macromolecules ( IF 5.1 ) Pub Date : 2017-09-07 00:00:00 , DOI: 10.1021/acs.macromol.7b01066 Kyle J. Johnson 1 , Emmanouil Glynos 1 , Serafeim-Dionysios Maroulas 2 , Suresh Narayanan 3 , Georgios Sakellariou 2 , Peter F. Green 1, 4
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Incorporating nanoparticles (NPs) within a polymer host to create polymer nanocomposites (PNCs) while having the effect of increasing the functionality (e.g., sensing, energy conversion) of these materials influences other properties. One challenge is to understand the effects of nanoparticles on the viscosity of nanoscale thick polymer films. A new mechanism that contributes to an enhancement of the viscosity of nanoscale thick polymer/nanoparticle films is identified. We show that while the viscosities of neat homopolymer poly(2-vinylpyridine) (P2VP) films as thin as 50 nm remained the same as the bulk, polymer/nanoparticle films containing P2VP brush-coated gold NPs, spaced 50 nm apart, exhibited unprecedented increases in viscosities of over an order of magnitude. For thicker films or more widely separated NPs, the chain dynamics and viscosities were comparable to the bulk values. These results—NP proximities and suppression of their dynamics—suggest a new mechanism by which the viscosities of polymeric liquids could be controlled for nanoscale applications.
中文翻译：
约束对聚合物纳米复合薄膜主链动力学的影响
将纳米颗粒（NP）掺入聚合物主体中以产生聚合物纳米复合材料（PNC），同时具有增加这些材料的功能性（例如，传感，能量转换）的效果，会影响其他性能。一项挑战是要了解纳米颗粒对纳米级厚聚合物膜粘度的影响。确定了有助于提高纳米级厚聚合物/纳米颗粒薄膜粘度的新机制。我们显示，虽然薄至50 nm的纯均聚物聚（2-乙烯基吡啶）（P2VP）膜的粘度与本体相同，但包含P2VP刷涂金NP的聚合物/纳米颗粒膜（相隔50 nm）显示出前所未有的粘度粘度增加超过一个数量级。对于较厚的胶片或更广泛分离的NP，链的动力学和粘度与总体值相当。这些结果-NP的邻近性和动力学的抑制-提出了一种新的机制，通过该机制可以控制聚合物液体的粘度以用于纳米级应用。
更新日期：2017-09-07
中文翻译：
约束对聚合物纳米复合薄膜主链动力学的影响
将纳米颗粒（NP）掺入聚合物主体中以产生聚合物纳米复合材料（PNC），同时具有增加这些材料的功能性（例如，传感，能量转换）的效果，会影响其他性能。一项挑战是要了解纳米颗粒对纳米级厚聚合物膜粘度的影响。确定了有助于提高纳米级厚聚合物/纳米颗粒薄膜粘度的新机制。我们显示，虽然薄至50 nm的纯均聚物聚（2-乙烯基吡啶）（P2VP）膜的粘度与本体相同，但包含P2VP刷涂金NP的聚合物/纳米颗粒膜（相隔50 nm）显示出前所未有的粘度粘度增加超过一个数量级。对于较厚的胶片或更广泛分离的NP，链的动力学和粘度与总体值相当。这些结果-NP的邻近性和动力学的抑制-提出了一种新的机制，通过该机制可以控制聚合物液体的粘度以用于纳米级应用。
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