Transition-Metal Coordination in Polymer Blends

聚合物共混物中的过渡金属配位

• 批准号: 9214022
• 负责人: Laurence Belfiore
• 金额: $ 21万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-15 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9214022&HistoricalAwards=false
• 关键词: Transition; Metal; Coordination; Polymer; Blends

Several metal-containing polymer blends which form coordination complexes are the focus of this investigation. The model compounds are low-molecular-weight salts in which the divalent metal centers range from iron to copper in the first row of the d-block, and ruthenium to silver in the second row. The ligand is poly(4- vinylpyridine) or copolymers that contain 4-vinylpyridine repeat units. Thermal analysis via differential scanning calorimetry and polarized optical microscopy will be employed to generate thermodynamic phase diagrams of these binary mixtures. At the molecular level, high-resolution carbon-13 solid-state nuclear magnetic resonance and Fourier transform infrared spectroscopies will be used to probe microenvironmental factors that influence mixing. Natural abundance nitrogen-15 solid-state nuclear magnetic resonance experiments in oversized rotors will provide a direct probe of metal-ligand sigma-bonding that involves the lone pair on nitrogen. The proposed enhancement of miscibility via coordination-type interactions brought about by metal ions is important because most polymer mixtures are not miscible, which limits their usefulness. Any improvement would lead to new structural materials.

几种形成配位络合物的含金属聚合物共混物是本研究的重点。模型化合物是低分子量盐，其中二价金属中心从铁到铜在d-嵌段的第一排，而Ru到银在第二排。该配体是含有4-乙烯基吡啶重复单元的聚(4-乙烯基吡啶)或共聚物。通过差示扫描量热法和偏光显微镜的热分析将被用来生成这些二元混合物的热力学相图。在分子水平上，将使用高分辨率碳-13固态核磁共振和傅里叶变换红外光谱来探测影响混合的微环境因素。自然丰度氮-15在超大转子上的固态核磁共振实验将提供涉及氮上唯一对的金属-配体sigma键的直接探针。所提出的通过金属离子带来的配位型相互作用来增强相容性是很重要的，因为大多数聚合物混合物是不相容的，这限制了它们的用途。任何改进都将导致新的结构材料的出现。