Phosphazenes

阿克伦大学的克莱尔·A·特西尔获得了无机化学、生物无机化学和金属有机化学项目的支持，以研究磷腈和聚磷腈。聚磷腈是无机聚合物中最大的一类，磷和氮原子沿主干交替排列。聚合物的性质可以通过改变磷取代基来调节。本研究项目的主要目标是(1)开发一种简便的Lewis酸催化合成线性二氯磷腈；(2)了解含有三个或四个P-N单元的小磷腈环的化学；(3)了解线型和交联型聚磷腈的性质。多核核磁共振是这一项目的关键工具，聚(磷腈)在弹性体材料、绝缘泡沫、离子导体固体溶剂、生物惰性膜、防火材料和药物控释聚合物等方面有着广泛的应用。其他有希望的聚磷腈的完全商业化一直受到合成不方便且往往无法重现的阻碍。该项目将尝试开发在较温和的条件下工作的合成方法，并提供更多所需的线性聚合物。接受这一多学科项目培训的学生，包括妇女和代表性不足群体的成员，将学习关键的合成、光谱和聚合物表征技术。

Claire A. Tessier, University of Akron, is supported by the Inorganic, Bioinorganic and Organometallic Chemistry Program for studies on phosphazenes and poly(phosphazenes). Poly(phosphazenes) are the largest group of inorganic polymers, with phosphorus and nitrogen atoms alternating along the backbone. The properties of the polymer can be tuned by varying the phosphorus substituents. The main goals of this research project are (1) to develop a convenient, Lewis-acid catalyzed synthesis of linear dichlorophosphazenes; (2) to understand the chemistry of small phosphazene rings with three or four P-N units; (3) to understand the properties of both linear and crosslinked polyphosphazenes. Multinuclear NMR is a key tool for this project.Poly(phosphazenes) have a wide range of applications in elastomeric materials, insulating foams, solid solvents for ion conductors, bioinert films, fireproofing materials and controlled-release drug polymers. Full commercialization of other promising poly(phosphazenes) has been hampered by inconvenient and often irreproducible syntheses. This project will attempt to develop syntheses that will work under milder conditions and give more of the desired linear polymers. Students trained on this multidisciplinary project, including women and members of underrepresented groups, will learn key synthetic, spectroscopic and polymer characterization techniques.