Phosphazenes

阿克伦大学化学系的Claire Tessier博士得到了化学部无机、生物无机和有机金属化学项目的支持，该项目旨在研究磷腈。将研究氯磷腈环、线性低聚物以及带有Lewis和Bronsted酸的聚合物的行为，包括GaX3、AlX3、SbF5、AsF5、TaF5、NbF5、HAlCl4、HBCl4和HTaCl4。该项目这一部分的目标是确定这种酸是否可以用作环状氯磷腈形成聚合物的开环聚合催化剂，并表征可能导致酸介导的聚合物降解的过程。开环聚合将通过多维、多核的核磁共振波谱进行研究。聚磷腈是无机主链聚合物中最大的一类，并已被开发出许多重要的应用。由于聚合物的合成困难、低效、昂贵和/或不可复制，聚磷腈的商业开发一直受到阻碍。这项研究将集中在氯磷腈的形成和稳定性，并可能导致新的，选择性的环磷腈聚合催化剂。这项建议将为研究生、本科生和博士后提供无机、聚合物和分析化学方面的培训。妇女和代表性不足的群体将大力参与这项工作。学生和学生协会都将参加外展活动，其目标是鼓励K-12学生在科学领域取得成功，并考虑在科学领域发展。

Dr. Claire Tessier, Chemistry Department, University of Akron, is supported by the Inorganic, Bioinorganic, and Organometallic Chemistry Program of the Chemistry Division for the study of phosphazenes. The behavior of chlorophosphazene rings, linear oligomers, and polymers with Lewis and Bronsted acids, including GaX3, AlX3, SbF5, AsF5, TaF5, NbF5, HAlCl4, HBCl4, and HTaCl4, will be studied. A goal of this portion of the project is to ascertain if such acids may serve as ring opening polymerization catalysts for the formation of polymers from cyclic chlorophosphazenes and to characterize processes that may be responsible for acid mediated polymer degradation. The ring opening polymerization will be studied by multidimensional, multinuclear nmr spectroscopy.Polyphosphazenes encompass the largest group of inorganic backbone polymers and many important applications have been developed for them. The commercial development of polyphosphazenes has been held back because the syntheses of the polymers are difficult, inefficient, expensive and/or irreproducible. This research will focus the formation and the stability of chlorophosphazenes and may lead to new, selective catalyst for the polymerization of cyclicphosphazenes. This proposal will provide training for graduate and undergraduate students and postdoctoral associates in inorganic, polymer, and analytical chemistry. Women and underrepresented groups will be strongly involved in the work. Both students and the PI will participate in outreach activities whose goal it is to encourage K-12 students to succeed in the sciences and to consider a career in the sciences.