CAREER: Bridging the Gap Between Bottlebrush and Comb Polymers with Precision Macroinitiators to Generate New Elastomeric Materials

职业生涯：利用精密大分子引发剂弥合洗瓶刷和梳状聚合物之间的差距，生成新的弹性材料

基本信息

批准号：
1750852
负责人：
Justin Kennemur
金额：
$ 53.4万
依托单位：
Florida State University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-06-01 至 2025-05-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1750852&HistoricalAwards=false
关键词：
CAREER Bridging Gap Between Bottlebrush

项目摘要

NON-TECHNICAL SUMMARYIn this project the PI and his students will synthesize, characterize, and determine a variety of material properties for a new class of high-performance elastic polymers that may have super-elastic or super-soft properties. Prominent advances in polymer chemistry over the last several decades have ushered in the ability to design a variety of molecular architectures with a high degree of control and functional versatility. The development of new molecular architectures that synergize the features of advanced functionality and enhanced elasticity is the primary objective of this research. The proposed work is hypothesized to produce ultra-flexible materials and super-soft gels that are potentially superior and could have applications as lubricants, articular cartilage (knee or joint) replacements, and protective equipment that reduces force impact. A new class of architectures of polymer molecules having bottlebrush-network shapes will be designed and explored, which is expected to lead to special super-elastic properties. This research will be integrated with broader impacts of education for undergraduates, graduates, and the local community. It will contribute to nurturing the growing research in polymer science at FSU and the nation. A three-point plan focuses on curriculum development, collaborative events, and community outreach directed towards underrepresented groups in polymer science. Education about plastics, their challenges, and their opportunities to solve societal needs for future generations will be undertaken and integrated with the proposed research. TECHNICAL SUMMARY The design of bottlebrush (BB) systems for frontier materials applications places emphasis on the degree of polymerization of the backbone and the side chains in addition to graft density. Although these coarse dials serve as a means to begin understanding of these unique architectures, there are other synthetic components which may present a means potentially to discover new properties. A majority of BB systems are derived from the polymerization of either a vinyl monomer or norbornene to produce a variety of graft chemistries affixed to a highly limited number of backbone options. This work proposes to expand the suite of backbone chemistries possible through the use of precise polypentenamer scaffolds suited to produce BB systems through a "grafting-from" approach. These materials will produce a graft at exactly every fifth carbon (similar to polynorbornenes) but with a flexible rubber-like backbone chemistry between each graft site. It is hypothesized that the reduced Kuhn length associated with this flexible backbone will result in amplified sensitivity as the size of the grafts increase and begin to occupy the pervaded volume around it. Such dynamic behavior will be fully studied through light scattering and viscoelastic measurements as a function of the synthetic design principles that elucidate variances in the aforementioned coarse dials for BB systems. The results will be corroborated with developing theoretical and computational treatments for BB systems. Given the rubber-like backbone, a natural extension for such systems towards superelastic and supersoft networks will be explored to provide potentially transformative materials for use in lubrication and impact dampening. A three-point plan will be implemented to increase the education in polymer science at FSU and the surrounding community through enhanced curriculum, collaborative events, and outreach. Undergraduates will be offered an advanced elective in polymer synthesis. Research focused around polymer science will be highlighted with an FSU annual poster session. Finally, continued efforts to reach out to the surrounding community through a plastics education exhibit will bring to light societal aspects that involve polymer science.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术总结这个项目PI和他的学生将综合，表征和确定可能具有超弹性或超柔软性能的新型高性能弹性聚合物的各种材料特性。在过去的几十年中，聚合物化学的显着进步已经迎来了设计具有高度控制和功能多功能性的各种分子体系结构的能力。这项研究的主要目标是协同高级功能和增强弹性的新分子体系结构的开发。拟议的工作被认为可以生产出可能优越的超柔滑材料和超柔软的凝胶，并且可以用作润滑剂，关节软骨（膝盖或关节）的替代品以及降低力影响力影响的保护设备。将设计和探索具有具有瓶装刷新形状的聚合物分子的新类别的结构，预计将导致特殊的超弹性特性。这项研究将与本科生，毕业生和当地社区的教育影响更大。它将有助于培养FSU和国家聚合物科学的不断增长的研究。三分计划的重点是针对聚合物科学中代表性不足的群体的课程开发，协作活动和社区宣传。关于塑料，他们的挑战以及他们解决子孙后代社会需求的机会的教育将与拟议的研究进行并融合。技术总结用于边界材料应用的瓶洗（BB）系统的设计重点是主链聚合的程度和除移植密度之外的侧链。尽管这些粗糙的表盘是开始理解这些独特体系结构的一种手段，但还有其他合成组件可能会呈现一种可能发现新属性的手段。大多数BB系统均来自乙烯基单体或氯烯烯的聚合，以产生各种固定在高度有限的骨干选项上的移植化学。这项工作建议通过使用适合通过“接种式”方法来生产BB系统的精确多观念支架来扩展可能的骨干化学套件。这些材料将在每五个碳（类似于聚生元）上产生移植物，但在每个移植部位之间具有柔软的橡胶样骨架化学反应。假设与此柔性主链相关的kuhn长度的减小将导致增强灵敏度，因为移植物的大小增加并开始占据周围的均匀体积。这种动态行为将通过光散射和粘弹性测量作为合成设计原理的函数进行充分研究，该原理阐明了BB系统上述粗拨盘中的方差。结果将通过开发BB系统的理论和计算处理来证实结果。考虑到类似橡胶的主链，将探索此类系统对超弹性和超托网络的天然扩展，以提供潜在的变革性材料，以用于润滑和冲击阻尼。将实施一个三分计划，以通过增强的课程，协作活动和宣传来增加FSU和周围社区聚合物科学的教育。本科生将提供高级聚合物合成的选修课。 FSU年度海报会议将重点介绍围绕聚合物科学的研究。最后，继续努力通过塑料教育展览与周围的社区接触，这将带来涉及聚合物科学的社会方面。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力优点和更广泛影响的审查标准来通过评估来获得支持的。