Structural Effects on Interdiffusion, Entanglement, and Ultimate Mechanical Behavior of Polymers

结构对聚合物相互扩散、缠结和最终力学行为的影响

• 批准号: 9522596
• 负责人: Leslie Sperling
• 金额: $ 17.8万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-15 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9522596&HistoricalAwards=false
• 关键词: Structural; Effects; Interdiffusion; Entanglement; Ultimate

9522596 Sperling This proposal was submitted under the GOALI program and involves the collaboration of Lehigh University and Rohm and Haas Corp. in an industrially important program of research. The objective of this proposal is to provide a study of the structural effects of polymers on interdiffusion, entanglement, and ultimate mechanical behavior. The focus will be the effect ofionic end group substitution and x1 on interdiffusion. A direct comparison of the diffusion coefficients, depth of interdiffusion, and volume fraction of mixing will be determined on various polymer pairs, one of which contains deuterium, chromophores, or both, with the objective of determining the relative advantages and potential drawbacks of measurements via small-angle neuron methods are being used successfully, no direct comparison of the two methods has yet been made. In particular, positive x1 values are known to exist in deuterated-protonated polymer pairs, and a similar effect may exist in donor-acceptor pair chemistry. The size of the donor and acceptor chromophores may impede interdiffusion. Mechanical measurements on selected films are planned, to provide a more complete picture of the interdiffusion phenomenon, and to allow evaluation of scaling law relationships. A series of anionically made polystyrenes and polymethacrylates containing deuterium or hydrogen, or donor acceptor fluorescent chromophores, or both kinds of labels will be obtained, with appropriate modification carried out in house. Polymers made via anionic polymerization and formed into latexes via interdiffusion observe by small-angle neutron scattering and non-radiative energy transfer, as appropriate. Variables will include polymer molecular weight, time, and temperature of annealing of the films, and extent of labeling with various groups. A series of new experiments are planned to explore the possibility of a thermodynamic acceleration. Here, slightly negative x1 values may result in a more rapid interdiffusion of polymer chains, with concomitant more rapid development of strength in the resulting films. This will be a cooperative research between Rohm and Haas and Lehigh University personnel. Rohm and Haas is committing $100,000 towards the successful completion of their portion of the research. This research will be helpful in developing water-based coating technology, minimizing the need for solvents, plasticizers, or coalescing aids. ***

小行星9522596 该提案是根据GOALI计划提交的，涉及利哈伊大学和Rohm and哈斯公司在一个工业上重要的研究计划中的合作。 本提案的目的是研究聚合物的结构对相互扩散、缠结和最终力学行为的影响。 重点讨论了离子端基取代和x1对互扩散的影响。 将在各种聚合物对上确定扩散系数、相互扩散深度和混合体积分数的直接比较，其中一种聚合物对含有氘、发色团或两者，目的是确定测量的相对优势和潜在缺点通过小角度神经元方法正在成功使用，尚未对这两种方法进行直接比较。 特别地，已知正的x1值存在于氘化-质子化聚合物对中，并且类似的效应可能存在于供体-受体对化学中。 供体和受体发色团的大小可能阻碍相互扩散。 机械测量选定的电影计划，以提供一个更完整的图片的相互扩散现象，并允许评价的标度律关系。 通过内部进行适当的修饰，将获得一系列阴离子制备的含有氘或氢的聚苯乙烯和聚甲基丙烯酸酯，或供体受体荧光发色团，或这两种标记。 通过阴离子聚合制备的聚合物和通过相互扩散形成胶乳的聚合物通过小角中子散射和非辐射能量转移进行观察。 变量将包括聚合物分子量、时间和膜的退火温度，以及用各种基团标记的程度。 计划进行一系列新的实验来探索热力学加速的可能性。 这里，稍微负的x1值可能导致聚合物链的更快速的相互扩散，伴随着所得膜中强度的更快速发展。 这将是Rohm和哈斯以及利哈伊大学人员之间的合作研究。 Rohm和哈斯承诺投入10万美元用于成功完成他们的部分研究。 这项研究将有助于开发水性涂料技术，最大限度地减少对溶剂，增塑剂或聚结助剂的需求。 ***