Materials World Network: Dynamics of Polymer Nanocomposites

材料世界网：聚合物纳米复合材料的动力学

• 批准号: EP/G065373/2
• 负责人: Nigel Clarke
• 金额: $ 24.08万
• 依托单位: University of Sheffield
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2011
• 资助国家: 英国
• 起止时间: 2011 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FG065373%2F2
• 关键词: Materials; World; Network; Dynamics; Polymer

Polymer nanocomposites, namely mixtures of nanoparticles dispersed in a polymer matrix, have gained rapid attention for both industrial and fundamental studies since their introduction in the early 1990's. One of the first high impact applications was provided by Toyota Central Research (Kojima, 1993) who demonstrated that the addition of a few vol % of layered silicate greatly improved the mechanical properties of nylon 6. In fact, the commercial use of PNCs with improved elastic modulus, electrical conductivity, flame retardation and thermal conductivity can be found across many economic sectors including aerospace, electronics, and sporting applications. Whereas certain PNCs, such as polymer-nanoclay composites, appear to be reaching maturity, interest in systems with cylindrical nanoparticles, such as carbon nanotubes and metal nanowires, is increasing.The main objective of this research is to provide fundamental understanding of polymer dynamics in the presence of cylindrical nanoparticles using a coordinated experimental and theoretical approach. This proposed Materials World Network contains expertise in nanoparticle synthesis, nanocomposite fabrication, imaging, depth profiling, rheology, theory and simulation to systematically address how the presence of cylindrical nanoparticles with aspect ration from 2 to 500 impacts polymer dynamics. This MWN team has considerable experience in polymer nancomposites and is committed to working together to explore polymer diffusion and rheology in these fascinating and commercially-important materials.The proposed Materials World Network is well-positioned for groundbreaking insights into the physics of polymer nanocomposites that are likely to have positive impact on the emerging industry of polymer nanocomposites. While our proposed research will focus on two types of cylindrical nanoparticles, carbon nanotubes and metal nanowires, our findings will be applicable to a broad range of cylindrical nanoparticles. Understanding the polymer dynamics is particularly important when designing fabrication methods for nanocomposites. When a master batch containing a high concentration of nanoparticles is melt mixed with a neat polymer, the rate of polymer diffusion is critical for establishing a homogeneous concentration. For example, one strategy for balancing the high cost of CNTs with their attractive properties involves coating latex particles with CNTs and then sintering the particles to achieve good interfacial strength. The material strength is determined by the interdiffusion of polymers across the interfacial region to form entanglements and the mechanism for this will be enlightened by the proposed research. Further afield, probing the dynamics of elongated nanoparticles can provide insight into the relaxations of stiff biological molecules moving in the crowded intracellular region of living cells.

聚合物纳米复合材料，即分散在聚合物基质中的纳米颗粒的混合物，自20世纪90年代初被S引入以来，迅速引起了工业和基础研究的关注。丰田汽车研究中心(小岛，1993)提供了第一批高影响力的应用之一，他证明了添加少量体积%的层状硅酸盐极大地改善了尼龙6的力学性能。事实上，具有改善弹性模量、导电性、阻燃性和导热性的PNC的商业用途可以在许多经济领域找到，包括航空航天、电子和体育应用。虽然某些PNC，如聚合物-纳米粘土复合材料，似乎正在走向成熟，但人们对含有圆柱形纳米粒子的系统，如碳纳米管和金属纳米线的兴趣正在增加。本研究的主要目的是通过协调的实验和理论方法，提供对圆柱形纳米粒子存在下的聚合物动力学的基本理解。这个拟议的材料世界网络包含纳米颗粒合成、纳米复合材料制造、成像、深度剖析、流变学、理论和模拟方面的专业知识，以系统地研究长宽比从2到500的圆柱形纳米颗粒的存在如何影响聚合物动力学。该MWN团队在聚合物纳米复合材料方面拥有丰富的经验，并致力于合作探索聚合物在这些迷人且具有商业重要性的材料中的扩散和流变学。拟议的材料世界网络处于有利地位，可以对聚合物纳米复合材料的物理具有开创性的见解，这可能对新兴的聚合物纳米复合材料行业产生积极影响。虽然我们建议的研究将集中在两种类型的圆柱形纳米粒子，碳纳米管和金属纳米线，我们的发现将适用于广泛的圆柱形纳米粒子。在设计纳米复合材料的制备方法时，了解聚合物动力学尤为重要。当含有高浓度纳米颗粒的母粒与整齐的聚合物熔融混合时，聚合物的扩散速度对于建立均匀的浓度至关重要。例如，平衡碳纳米管高成本和其诱人性能的一种策略是在乳胶颗粒上涂覆碳纳米管，然后对颗粒进行烧结以获得良好的界面强度。材料的强度取决于聚合物在界面区域的相互扩散以形成纠缠，这一机制将通过拟议的研究得到启发。在更远的地方，探测细长纳米颗粒的动力学可以洞察僵硬的生物分子在活细胞拥挤的细胞内区域运动时的松弛。

项目成果

Anisotropic Polymer Conformations in Aligned SWCNT/PS Nanocomposites.

对齐的 SWCNT/PS 纳米复合材料中的各向异性聚合物构象。

• DOI: 10.1021/acsmacrolett.5b00256
• 发表时间: 2015
• 期刊: ACS macro letters
• 影响因子: 7.015
• 作者: Tung WS