Macromolecular Architecture and Properties

该基金旨在制备新型互穿聚合物网络（IPN’s），包括混合多孔无机材料（其孔隙含有不寻常性质的聚合物链），以及非线性光学（NLO）发色团功能化的完整和伪（或半）IPN。后一种IPN材料为长寿命的二次谐波产生膜提供了很大的希望。其他含有K3C60的线性聚合物的共混物是超导的，将进一步研究。在与许多其他研究小组的合作下，这些新材料将使用SAXS与同步辐射，介电和超声波测量以及更常见的电子显微镜，差示扫描量热法（DSC）和机械性能测量进行研究。这些材料的最终用途取决于它们是否经历了相变，例如IPN通常是微相分离的（特别是在机械应力下），或者它们是否在IPN凝胶中表现出三相坍塌。进一步的聚合物有序转变，如限制在壁之间的二嵌段共聚物的微相分离转变和硬盘分子的向列和盘状有序将使用精确模型进行研究。这个项目属于一般领域的合成，聚合物共混物和网络的性质。除了有助于制备具有特殊用途的新材料，如增韧膜，NLO器件，分离膜和新的催化剂载体，所提出的工作应该有助于阐明聚合物相变的一些有趣的特征。* * *

9628224 Frisch This grant aims at the preparation of novel interpenetrating polymer networks (IPN's) including hybrid porous inorganic material containing ones (whose pores contain polymer chains of unusual properties) as well as full and pseudo (or semi) IPN's functionalized with non-linear optical (NLO) chromophores. The latter IPN materials offer great promise for long lived second harmonic generating films. Other K3C60 containing blends of linear polymers are superconducting and will be further investigated. In collaboration with a number of other investigator groups, these new materials will be studied using SAXS with synchrotron radiation, dielectric and ultrasonic measurements as well as the more usual electron microscopy, differential scanning calorimetry (DSC) and mechanical property measurements. The ultimate use of these materials depends on whether they have undergone a phase transition, e.g. IPN's are often microphase separated (particularly if mechanically stressed), or whether they exhibit a triphasic collapse in the ease of IPN gels. Further polymer ordering transitions such as the microphase separation transition in diblock copolymers confined between walls and the nematic and discoidal ordering with hard disc molecules will be studied using exact models. %%% This project falls into the general area of synthesis, and properties of polymer blends and networks. Besides contributing to the preparation of novel materials with special uses such as toughened membranes, NLO devices, separation membranes, and new catalyst supports, the proposed work should help elucidate some interesting features of polymer phase transitions. ***