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

9522596 Sperling该提案是在GOALI计划下提交的，涉及里海伊大学和罗门哈斯公司在一个重要的工业研究计划中的合作。本提案的目的是提供聚合物的相互扩散，纠缠和最终力学行为的结构效应的研究。重点是离子端基取代和x1对相互扩散的影响。直接比较扩散系数、相互扩散深度和混合体积分数将在各种聚合物对上确定，其中一种含有氘、发色团，或两者兼有，目的是确定通过小角度神经元方法测量的相对优势和潜在缺点正在成功地使用，但尚未对两种方法进行直接比较。特别是，已知在氘化-质子化聚合物对中存在正的x1值，并且在供体-受体对化学中可能存在类似的效应。供体和受体发色团的大小可能阻碍相互扩散。计划对选定的薄膜进行机械测量，以提供更完整的相互扩散现象的图像，并允许对标度律关系进行评估。一系列阴离子制备的聚苯乙烯和聚甲基丙烯酸酯含有氘或氢，或供体-受体荧光发色团，或两种标记，适当的修饰将在室内进行。通过阴离子聚合制成的聚合物，通过相互扩散形成乳胶，通过适当的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，时间和退火薄膜的温度，以及标记与各种基团的程度。计划进行一系列新的实验来探索热力学加速的可能性。在这里，略负的x1值可能会导致聚合物链的相互扩散更快，从而使所得膜的强度发展更快。这将是Rohm和Haas和利哈伊大学人员之间的合作研究。Rohm和Haas承诺为成功完成他们的研究投入10万美元。这项研究将有助于发展水性涂料技术，减少对溶剂、增塑剂或聚结剂的需求。＊＊＊

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. ***