Materials World Network: Polymers Dynamics in the Presence of Nanoparticles

材料世界网络：纳米粒子存在下的聚合物动力学

• 批准号: 0908449
• 负责人: Karen Winey
• 金额: $ 48万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-01 至 2013-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0908449&HistoricalAwards=false
• 关键词: Materials; World; Network; Polymers; Dynamics

This research helps provide a fundamental understanding of polymer dynamics in the presence of nanoparticles using a coordinated experimental and theoretical approach. This Materials World Network team from the University of Pennsylvania and Durham University has considerable experience in polymer nancomposites and dynamic properties, and is working together in exploring polymer diffusion and rheology in these fascinating and complex materials. This team recently found a dramatic example of how polymers behave differently in the presence of nanoparticles, wherein polymer diffusion first slowed and then recovered with the addition of nanoparticles. Research efforts are focusing on three aspects of polymer nanocomposite dynamics. (1) Establishing the underlying mechanism of polymer diffusion in nanocomposites. A variety of studies are underway that explore the impact of nanoparticle / polymer interactions, nanoparticle orientation, relative size of the polymer and nanoparticle diameter, and nanoparticle shape. (2) Relating the polymer and nanoparticle diffusion studies to rheological measurements including linear viscoelastic measurements, zero-shear viscosity, plateau modulus and relaxation times. Polymer diffusion and polymer rheology are intimately related through fundamental relaxation parameters, so our goal is to reconcile these two measures of polymer dynamics in polymer nanocomposites. (3) Refining and extending our theoretical description of the polymer dynamics in the presence of nanoparticles. One critical extension is to adjust the monomeric friction coefficient near the particles to evaluate the importance of enthalpic interactions on diffusion.The research team is well-positioned for groundbreaking insights into the physics of polymer nanocomposites that are likely to have a positive impact on the emerging industry of polymer nanocomposites. Interactions include meetings, bi-monthly teleconferences, monthly reports, data sharing via a secure website, regular international trips, and remote access to experimental equipment. This project also addresses the needs of women in science and engineering by establishing professional problem-solving groups for women faculty and graduate students as a means to collectively address the challenges and opportunities in science and engineering careers. Furthermore, undergraduates from both the University of Pennsylvania and Durham University participate in the research activities as well as consider the business aspects of launching new materials.This Materials World Network research is supported by the DMR Polymers Program and the DMR Office of Special Programs.

这项研究有助于提供一个基本的理解聚合物动力学在纳米粒子的存在下，使用协调的实验和理论方法。 来自宾夕法尼亚大学和达勒姆大学的材料世界网络团队在聚合物纳米复合材料和动态性能方面拥有丰富的经验，并正在共同探索这些迷人而复杂的材料中的聚合物扩散和流变学。 该团队最近发现了一个戏剧性的例子，说明聚合物在纳米颗粒存在下的行为如何不同，其中聚合物扩散首先减慢，然后随着纳米颗粒的加入而恢复。 研究工作集中在聚合物纳米复合动力学的三个方面。 (1)建立纳米复合材料中聚合物扩散的基本机制。 正在进行各种研究，探索纳米颗粒/聚合物相互作用、纳米颗粒取向、聚合物和纳米颗粒直径的相对尺寸以及纳米颗粒形状的影响。 (2)将聚合物和纳米颗粒扩散研究与流变学测量相关联，包括线性粘弹性测量、零剪切粘度、平台模量和弛豫时间。 聚合物扩散和聚合物流变学是密切相关的，通过基本的松弛参数，所以我们的目标是调和这两个措施的聚合物动力学在聚合物纳米复合材料。 (3)完善和扩展我们的理论描述的聚合物动力学在纳米粒子的存在。 一个关键的扩展是调整颗粒附近的单体摩擦系数，以评估扩散过程中相互作用的重要性。该研究团队处于有利地位，可以对聚合物纳米复合材料的物理特性进行突破性的见解，这可能对新兴的聚合物纳米复合材料行业产生积极影响。 互动包括会议，双月电话会议，月度报告，通过安全网站共享数据，定期国际旅行和远程访问实验设备。该项目还通过为女教师和女研究生建立专业问题解决小组，作为集体应对科学和工程职业挑战和机遇的一种手段，满足科学和工程领域妇女的需求。 此外，宾夕法尼亚大学和达勒姆大学的本科生也参与了研究活动，并考虑推出新材料的商业方面。材料世界网络的研究得到了DMR聚合物计划和DMR特别计划办公室的支持。