RUI: Laser-Zone Drawing and Annealing of High Strength Polymer Nanofibers

RUI：高强度聚合物纳米纤维的激光区域拉伸和退火

• 批准号: 2110027
• 负责人: Vince Beachley
• 金额: $ 52.29万
• 依托单位: Rowan University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2110027&HistoricalAwards=false
• 关键词: RUI; Laser; Zone; Drawing; Annealing

This work generates new knowledge associated with laser heating of polymers to engineer and manufacture high strength nanofibers. The scientific knowledge and technological advances generated in the areas of polymer materials science, engineering and manufacturing promote economic growth and benefit society. Polymer nanofibers have widespread applications in a variety of critical industries including energy, transportation, aerospace, healthcare, electronics and sensing. Theoretically, nanofibers are expected to be stronger than larger conventional fibers, but in practice nanofibers are usually much weaker. This discrepancy arises because the manufacturing processes required to engineer ordered internal structures are difficult to apply to tiny, delicate nanofibers. This grant supports the investigation of fundamental scientific relationships associated with laser heating during polymer nanofiber stretching for exceptional control over the internal structure and resulting enhanced strength. Furthermore, the research uses a unique automated track continuous fiber-drawing system that ensures scale up and a clear path to commercialization. The project provides advanced training in materials science, advanced manufacturing and nanotechnology to numerous undergraduate and graduate students and establishes the Path to BS Research Training Program that supports underrepresented, economically disadvantaged students seeking BS degrees in Engineering.Laser zone drawing has demonstrated the potential to produce polymer fibers with high tensile strengths that exceed what is possible using conventional fiber manufacturing methods. However, the fundamental thermodynamic and material processing relationships governing laser zone fiber drawing have not been studied under tightly controlled conditions, especially for polymer nanofibers. This work fills that knowledge gap by using computational models and experimental investigation of polymer fibers subject to laser heating while the mechanical properties are continuously monitored. To process entire fibers, the laser beam is sequentially scanned to rapidly heat each small portion or zone of a fiber to make it pliable so it can be stretched. Macromolecular structure development during laser zone drawing is investigated with known fiber tension and temporal zone temperature. This approach is expected to facilitate remarkable control over the final internal structure of the processed fiber and result in exceptional mechanical strength. The utilization of automated tracks allows for controlled laser zone drawing of the delicate nanofibers. The hypothesis to be tested is that the rapid heating and cooling of nanofibers, due to their high surface area-to-volume ratio, facilitates alignment of polymer chains at elevated temperatures that are locked in place during rapid cooling before chain relaxation can occur, thereby enhancing mechanical behavior.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.

这项工作产生了与激光加热聚合物相关的新知识，以设计和生产高强度纳米纤维。聚合物材料科学，工程和制造业领域产生的科学知识和技术进步促进了经济增长和受益社会。聚合物纳米纤维在各种关键行业中广泛应用，包括能源，运输，航空航天，医疗保健，电子和传感。从理论上讲，纳米纤维有望比大型常规纤维更强，但实际上，纳米纤维通常要弱得多。出现这种差异是因为工程师订购的内部结构所需的制造过程很难应用于微妙的纳米纤维。该赠款支持研究与聚合物纳米纤维期间激光加热相关的基本科学关系，以伸展对内部结构并产生增强强度的特殊控制。此外，该研究使用了独特的自动轨道连续纤维绘制系统，可确保扩大规模和清晰的商业化途径。该项目为众多本科生和研究生提供了材料科学，先进制造和纳米技术方面的高级培训，并建立了BS研究培训计划的道路，该计划支持代表性不足的，经济上缺乏弱势群体的学生在工程中寻求BS学位的学生。激光区域中的BS学位具有超过限制性强度的聚合物的潜力，可以表现出可能超过限制性强度的聚合物。但是，在严格控制的条件下，尤其是对于聚合物纳米纤维，尚未研究控制激光区纤维图的基本热力学和材料加工关系。这项工作填补了通过计算模型和对激光加热的聚合物纤维的实验研究，而机械性能则连续监测。为了处理整个纤维，对激光束进行顺序扫描以快速加热纤维的每个小部分或区域以使其柔韧，从而可以将其拉伸。研究了已知的纤维张力和时间区域温度，研究了激光区图期间的大分子结构的发展。预计这种方法将促进对加工纤维的最终内部结构的明显控制，并导致出色的机械强度。自动轨道的利用允许精致的纳米纤维的受控激光区图。要测试的假说是，由于其高表面积和体积比的较高的纳米纤维的快速加热和冷却，可以促进在链条放松之前快速冷却过程中锁定的高温下锁定的聚合物链的对准，从而可以通过促进机械奖，并通过Infortional Infortional Internation Indertiffient of Deem.NSF的构建奖励，这表明了NSF的合法宣教型，并且是deem的of deem nsf of deem eval of deem the nsf the nsf teel nsf of dee eyme deem eval the nsf the nsf the nsf the nsf the nsf的奖励。更广泛的影响审查标准。