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

9522596斯珀林这项提案是根据GOALI计划提交的，涉及利哈伊大学和罗门哈斯公司在一项具有重要工业意义的研究计划中的合作。该提案的目的是研究聚合物对互扩散、纠缠和最终力学行为的结构影响。重点讨论了端基取代和x1对互扩散的影响。将在不同的聚合物对上确定扩散系数、互扩散深度和混合体积分数的直接比较，其中一个聚合物对包含氢和/或发色团，目的是确定通过小角度神经元方法测量的相对优点和潜在缺点是否成功使用，这两种方法尚未进行直接比较。特别是，已知的正x1值存在于氢化-质子化聚合物对中，在给体-受体对化学中也可能存在类似的效应。供体和受体发色团的大小可能会阻碍相互扩散。计划对选定的薄膜进行机械测量，以提供对互扩散现象的更完整的描述，并允许评估比例定律关系。通过在室内进行适当的修饰，可以得到一系列阴离子合成的含有氚或氢的聚苯乙烯和聚甲基丙烯酸酯，或给体受体荧光发色团，或这两种标记。通过阴离子聚合形成聚合物，并通过互扩散形成胶乳，适当时通过小角中子散射和非辐射能量转移观察。变量将包括聚合物分子量、薄膜的时间和温度以及标记不同基团的程度。计划进行一系列新的实验，以探索热力学加速的可能性。在这里，略微负的x1值可能会导致聚合物链更快地相互扩散，从而导致所得薄膜中强度的更快发展。这将是罗姆和哈斯与利哈伊大学工作人员的合作研究。罗姆和哈斯承诺提供10万美元，以成功完成他们那部分的研究。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、增塑剂或粘结助剂的需求。***

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. ***