CAREER: Post-Processing Polymer Nanofibers for Improved Mechanical Properties

职业：后处理聚合物纳米纤维以改善机械性能

基本信息

批准号：
1653329
负责人：
Vince Beachley
金额：
$ 50万
依托单位：
Rowan University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-07-01 至 2022-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1653329&HistoricalAwards=false
关键词：
CAREER Post Processing Polymer Nanofibers

项目摘要

This Faculty Early Career Development (CAREER) award supports a fundamental investigation into the molecular alignment that occurs in nanoscale fibers during post-processing. Strong polymer fibers are the building blocks for lightweight and high strength materials useful in a wide variety of industries. Researchers have studied and optimized conventional microscale fiber manufacturing and post-processing methods for many years to maximize fiber stiffness and strength. Polymer nanofibers have the potential for higher normalized strength than larger conventional fibers due to the physics associated with their small fiber diameter. However, conventional post-processing approaches are difficult to integrate with nanofabrication methods such as electrospinning, making the effects of post-processing on polymer nanofiber strength not well understood. Implementation, investigation, and optimization of conventional post-processing methods for electrospinning have the potential to realize ultra-strong, lightweight polymer nanofiber and polymer-derived carbon nanofiber material. These materials would benefit key industries and our society by reducing energy costs, increasing safety, and making it possible to build larger structures and faster vehicles, vessels, and air/spacecraft. Project execution will provide advanced training in nanotechnology and materials science and engineering to graduate and undergraduate students. The associated outreach activities will expose elementary and high school students to engineering and science to promote the pursuit of STEM education and careers. The objective of this award is to investigate the macromolecular-level structural transition of polymer nanofibers during drawing and the resultant mechanical properties. Methodologies will be established to process both individual nanofibers and low density aligned polymer nanofiber mats under independently controlled parameters including cure time prior to stretching, processing temperature, and stretch rate. Process/structure/property relationships will be established to investigate the effects of polymer chain mobility, molecular weight and fiber diameter in relation to maximum elongation of the nanofibers. The influence of fiber-fiber junctions on strain for low density non-woven mats will be modeled and tested experimentally to determine the importance of post-stretching individual polymer nanofibers versus an assembly of nanofibers. These studies will provide evidence of polymer nanofiber strength development during drawing as well as the effect of scale on polymer fiber post-processing.

这项教师早期职业发展（职业）奖支持对后处理过程中纳米级纤维中发生的分子对齐的基本调查。强聚合物纤维是对各种行业有用的轻质和高强度材料的基础。研究人员多年来研究并优化了常规微观纤维制造和后处理方法，以最大化纤维刚度和强度。由于与小纤维直径相关的物理学，聚合物纳米纤维具有比较大的常规纤维更高的归一化强度的潜力。然而，常规的后处理方法很难与诸如静电纺丝之类的纳米化方法集成，从而使后处理对聚合物纳米纤维强度的影响尚不清楚。用于静电纺丝的常规后加工方法的实施，研究和优化有可能实现超强，轻质的聚合物纳米纤维和聚合物衍生的碳纳米纤维材料。这些材料将通过降低能源成本，提高安全性，并使建造更大的结构和更快的车辆，船只和空中/航天器将使关键行业和我们的社会受益。项目执行将为研究生和本科生提供纳米技术和材料科学和工程学的高级培训。相关的外展活动将使小学生和高中学生进入工程和科学，以促进对STEM教育和职业的追求。该奖项的目的是研究在绘图过程中聚合物纳米纤维的大分子级结构过渡和所得的机械性能。将建立方法论，以在独立控制的参数下处理单个纳米纤维和低密度对齐聚合物纳米纤维垫，包括在拉伸，加工温度和拉伸速率之前的治疗时间。将建立过程/结构/性质关系，以研究聚合物链迁移率，分子量和纤维直径与纳米纤维的最大伸长有关的影响。纤维纤维连接对低密度非编织垫的应变的影响将进行建模和实验测试，以确定拉伸后单个聚合物纳米纤维与纳米纤维组装的重要性。这些研究将提供绘制过程中聚合物纳米纤维强度发展以及尺度对聚合物纤维后处理的影响的证据。

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Highly Aligned Centrifugal Spun Polyacrylonitrile Nanofibers Collected and Processed with Automated Tracks

DOI：
10.1002/mame.202200488
发表时间：
2022-10
期刊：
Macromolecular Materials and Engineering
影响因子：
3.9
作者：
Dave Jao;T. A. Lima;Lavenia J Thursch;Matthew D. Flamini;J. Pressly;Jason Ippolito;N. Alvarez;V. Beachley
通讯作者：
Dave Jao;T. A. Lima;Lavenia J Thursch;Matthew D. Flamini;J. Pressly;Jason Ippolito;N. Alvarez;V. Beachley

Mechanical Considerations for Electrospun Nanofibers in Tendon and Ligament Repair