Dynamics of Phase Separating Thin Film Blends

相分离薄膜共混物的动力学

• 批准号: 9974366
• 负责人: Russell Composto
• 金额: $ 32.6万
• 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: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9974366&HistoricalAwards=false
• 关键词: Dynamics; Phase; Separating; Thin; Film

9974366CompostoThe proposed research will focus on the dynamics of phase separating thin film blends. These studies aim to develop a comprehensive understanding of thin film kinetics by measuring the wetting layer growth at both the air / polymer and polymer / substrate interfaces, phase morphology immediately beneath the wetting layer, domain coarsening, surface roughness, and the roughness between the wet and non-wet phases. To probe underlying principles, dynamics will be studied as a function of materials parameters including molecular weight and composition, process dependent variables including film thickness and temperature, and substrate surface energy. To test for universal behavior, a range of model blend systems will be investigated including blends with a lower critical solution temperature and an upper critical solution temperature, in addition to copolymer blends. To directly test the interplay between phase separation and wetting, AFM will be used to directly image the near-surface morphology after selective etching of the wetting phase. Wetting layer growth will be followed using low-energy, forward recoil spectrometry, LE-FRES, and neutron reflectivity. Furthermore, LE-FRES will be developed for the analysis of laterally non-uniform samples. To quantify lateral phase composition and possibly the interfacial width at curved interfaces, analytical TEM will be developed in-house and near edge x-ray adsorption fine structure spectroscopy will be performed in collaboration with NIST. In addition to homogeneous substrates, studies will aim to control lateral profiling studies, wetting properties will be measured using a contact angle goniometer and AFM. An important component of the proposed research is to extend fundamental studies on model systems to advanced materials involving ionomer adhesion promoters and patterned dielectric materials.The proposed research on polymer films and coatings will provide fundamental scientific understanding that could impact advanced technological applications in the health (e.g. contact lenses, membranes) and microelectronics (e.g. dielectrics and resists) fields. Undergraduates (4/year) will continue to participate in the research program, along with public high-school teachers during the summer.

9974366 CompoStothe提出的研究将重点放在分离薄膜混合物的相位动力学上。 这些研究旨在通过测量空气 /聚合物 /聚合物 /底物界面的润湿层的生长，紧邻润湿层下方的相位形态，结构域的粗糙，表面粗糙度以及湿润阶段之间的粗糙度，通过测量湿膜动力学的全面了解。 为了探测潜在的原理，将研究动态作为材料参数的函数，包括分子量和组成，过程相关变量，包括膜的厚度和温度以及底物表面能。 为了测试通用行为，还将研究一系列模型混合系统，包括除共聚物混合物外，临界溶液温度和上部临界溶液温度较低的混合物。 为了直接测试相位分离和润湿之间的相互作用，AFM将用于在选择性蚀刻润湿阶段后直接对近表面形态进行成像。 润湿层的生长将使用低能，正向后坐力光谱法，LE-FRE和中子反射率进行。 此外，将开发LE-FRES用于分析侧面不均匀样品。 为了量化侧相组成以及弯曲界面处的界面宽度，将与NIST合作进行内部和近边缘X射线吸附细胞光谱的分析TEM。 除均质底物外，研究还将旨在控制侧向分析研究，将使用接触角性角度计和AFM测量润湿性能。 An important component of the proposed research is to extend fundamental studies on model systems to advanced materials involving ionomer adhesion promoters and patterned dielectric materials.The proposed research on polymer films and coatings will provide fundamental scientific understanding that could impact advanced technological applications in the health (e.g. contact lenses, membranes) and microelectronics (e.g. dielectrics and resists) fields. 夏季，本科生（4/年）将继续与公立高中老师一起参加研究计划。