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GOALI: Dynamics of Ultrasound-Responsive Polymeric Systems: from Atoms to Devices

GOALI：超声响应聚合物系统的动力学：从原子到设备

基本信息

批准号：
2016474
负责人：
Shima Shahab
金额：
$ 51.12万
依托单位：
Virginia Polytechnic Institute and State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-08-01 至 2024-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2016474&HistoricalAwards=false
关键词：
GOALI Dynamics Ultrasound Responsive Polymeric

项目摘要

Shape memory polymers are an emerging class of smart materials that have the ability to return from a deformed temporary shape to their original permanent shape when subjected to an external stimulus such as heat, light, and a magnetic field. These polymers have recently gained substantial interest in many applications including robotics, biomedical devices, and soft electronics. In many of these applications, there is an immediate industrial need for replacing conventional triggering methods for actuating the polymers with a more efficient and flexible method. This Grant Opportunities for Academic Liaison with Industry (GOALI) grant will investigate high-intensity focused ultrasound as a novel and promising stimulus with unique capabilities to actuate the controlled shape recovery of shape memory polymers. Focused ultrasound actuates the polymer remotely and locally, is noninvasive, and is biocompatible. These properties make the methodology a superior candidate, particularly for biomedical applications. The research will be integrated into industrial practice by the industrial partner, MedShape Inc., to provide practical approaches for the fabrication of ultrasound-sensitive polymers for medical applications. MedShape Inc. will fabricate industrial shape memory polymer actuators and provide student internship opportunities. The outcomes of this research award will increase the core competencies of U.S. medical industries.This award will support the experiments and multiscale modeling of the dynamics of shape memory polymers under high-intensity focused ultrasound fields. The research aims at filling a knowledge gap in terms of considering time-variant and nonlinear effects associated with high excitation levels in acoustic-responsive polymers. A multiphysics framework will be established to bridge the dynamical deformation mechanisms at the atomistic scale to the response of the polymer at the macroscale. This framework will then be combined with experiments to efficiently design the chemical composition and crystalline structure of ultrasound-responsive polymers, based on extrinsic length scales and intrinsic material properties. The output of the research effort will unravel the unknown mechanisms of acoustic-induced thermal actuation, by which ultrasound waves heat polymers, and help in optimizing the dynamic processes of shape fixation and recovery of shape memory polymer structures in high-intensity focused ultrasound fields. The findings will also uncover how the geometrical aspects of the additively manufactured shape memory polymers will affect the dynamics of the polymer in various ultrasound fields. In collaboration with the industrial partner, MedShape Inc., the approach developed in the research supported by this award will be utilized to design and fabricate novel ultrasound-responsive polymer-based devices with medical applications.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.

形状记忆聚合物是一类新兴的智能材料，当受到外部刺激（如热、光和磁场）时，它们能够从变形的临时形状恢复到其原始的永久形状。这些聚合物最近在许多应用中获得了极大的兴趣，包括机器人，生物医学设备和软电子。在许多这些应用中，存在用更有效和灵活的方法代替用于致动聚合物的常规触发方法的直接工业需求。这个赠款机会学术联络与工业（GOALI）赠款将调查高强度聚焦超声作为一种新颖的和有前途的刺激与独特的能力，以驱动形状记忆聚合物的受控形状恢复。聚焦超声远程和局部驱动聚合物，是非侵入性的，并且是生物相容的。这些特性使得该方法成为上级候选者，特别是对于生物医学应用。该研究将由工业合作伙伴MedShape Inc.整合到工业实践中，提供制造用于医学应用的超声敏感聚合物的实用方法。MedShape Inc.将制造工业形状记忆聚合物致动器，并提供学生实习机会。该研究奖项的成果将提高美国医疗行业的核心竞争力。该奖项将支持形状记忆聚合物在高强度聚焦超声场中的动力学实验和多尺度建模。该研究旨在填补知识空白，考虑时变和非线性效应与高激发水平的声响应聚合物。一个多物理场的框架将建立桥梁的动态变形机制在原子尺度上的聚合物在宏观尺度上的响应。然后，该框架将与实验相结合，根据外在长度尺度和内在材料特性，有效地设计超声响应聚合物的化学组成和晶体结构。研究工作的成果将揭示声致热致动的未知机制，超声波通过该机制加热聚合物，并有助于优化形状固定和形状记忆聚合物结构在高强度聚焦超声场中恢复的动态过程。研究结果还将揭示增材制造的形状记忆聚合物的几何方面如何影响聚合物在各种超声场中的动力学。与工业合作伙伴MedShape Inc.合作，该奖项支持的研究方法将用于设计和制造具有医疗应用的新型超声响应聚合物基设备。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。