CAREER: Morphological Control in Polymer Blends Using Polymeric Surfactants
职业:使用聚合物表面活性剂控制聚合物共混物的形态
基本信息
- 批准号:0448845
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2005
- 资助国家:美国
- 起止时间:2005-02-01 至 2011-04-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
ABSTRACT - 0448845Motivation: Blending of immiscible polymers is an effective and efficient strategy to obtain materials with unusual properties. Often the desired properties are realized only if the blend has a specific morphology, e.g. a diffusion-barrier material requires that the low-diffusivity component be in the form of lamellae or platelets. An ability to control the morphology is therefore crucial for design of new polymeric materials. The hypothesis of this proposal is that the morphology of immiscible polymer blends can be controlled by addition of polymeric surfactants. Specifically, we propose to exploit the coupling between interfacial flow and surfactant concentration to manipulate the morphology. Research Proposal: The structure obtained from a two-phase blending operation is a result of the interplay between hydrodynamic stresses due to blending, and interfacial stresses due to interfacial tension. The latter make it difficult to obtain small-scale anisotropic morphologies in blends. A well-known effect of added surfactant is to reduce these interfacial stresses by decreasing the equilibrium interfacial tension between the immiscible phases. Less obviously, a coupling between the flow and the concentration of the surfactant on the interface causes deviations of the interfacial tension from its equilibrium value, as well as interfacial tension gradients, along the interface. The focus of this proposal is to quantify these nonequilibrium surfactant effects, and exploit them to control structural evolution. Key elements of the methodology are simple materials and flow fields to help highlight interfacial phenomena, and a surfactant that is generated by an interfacial coupling reaction. The latter ensures that most of the surfactant remains at the interface, and very little dissolves in the bulk. A crucial innovation is the use of fluorescently-tagged surfactants, which allows locating the surfactant in the blend, and measuring the local interfacial tension, by confocal laser scanning microscopy. The mechanisms by which surfactants can achieve unusual morphologies such as dispersed plates, dispersed ribbons, or dual-phase continuity, will be elucidated. Rheological methods to determine the viscoelastic properties of surfactant-laden interfaces will be explored. Education Plan: The education plan addresses the need to shift the undergraduate Chemical Engineering curriculum towards Chemical Product Design. The central educational goal is to introduce product design ideas throughout the curriculum, and not only as an add-on Product Design course. Short modules that can be incorporated into existing classes in Chemical Engineering will be designed to facilitate a curriculum-wide introduction to Chemical Product Design. These will culminate in a newly developed capstone course on Chemical Product Design. In the modules as well as in the course, all case studies will be chosen to emphasize core Chemical Engineering disciplines such as Transport Phenomena and Thermodynamics. Intellectual merit: Polymeric surfactants, (more commonly referred to as "compatibilizers") are routinely used to facilitate blending of immiscible polymers. This proposal is based on the idea that the same surfactants can also be used to manipulate the morphology. The chief scientific advances over past research in this area are that the anisotropy of the structure, and the coupling between the flow and the surfactant on the interface, will be quantified for the first time. This research will offer fundamental insights into the fluid mechanics of multiphase flow and will lay guidelines for using surfactants to control structure in immiscible polymer blends.Broader impact: While the research will be conducted on polymeric systems, the results are applicable to all liquid-liquid emulsions with surfactants, such as those encountered in the foods, personal care products, or oil industries. The rheological properties obtained in this research will guide the design of processing equipment for polymer blends. A significant portion of the research will be performed by undergraduate students. The product design modules, to be made available to instructors everywhere, is likely to influence the pedagogy of product design in other Chemical Engineering departments.Feasibility: The PI has extensive knowledge and experimental skills in the research topics covered here. All necessary experimental resources are either available, or will be purchased during this research. The Department whole-heartedly supports the curricular changes proposed in the education plan.
摘要 - 0448845动机:不混溶聚合物的共混是获得具有不寻常特性的材料的有效且高效的策略。通常,只有当共混物具有特定形态时才能实现所需的性能,例如扩散阻挡材料要求低扩散率成分为薄片或片晶的形式。因此,控制形态的能力对于新型聚合物材料的设计至关重要。该提案的假设是,不混溶聚合物共混物的形态可以通过添加聚合物表面活性剂来控制。具体来说,我们建议利用界面流动和表面活性剂浓度之间的耦合来操纵形态。研究建议:通过两相混合操作获得的结构是混合引起的流体动力应力与界面张力引起的界面应力之间相互作用的结果。后者使得难以在共混物中获得小规模的各向异性形态。添加表面活性剂的一个众所周知的作用是通过降低不混溶相之间的平衡界面张力来降低这些界面应力。不太明显的是,界面上的流动和表面活性剂浓度之间的耦合导致界面张力偏离其平衡值,以及沿界面的界面张力梯度。该提案的重点是量化这些非平衡表面活性剂效应,并利用它们来控制结构演化。该方法的关键要素是帮助突出界面现象的简单材料和流场,以及通过界面耦合反应产生的表面活性剂。后者确保大部分表面活性剂保留在界面上,并且很少溶解在本体中。一项关键的创新是使用荧光标记的表面活性剂,它可以在混合物中定位表面活性剂,并通过共焦激光扫描显微镜测量局部界面张力。将阐明表面活性剂获得不寻常形态(如分散板、分散带或双相连续性)的机制。将探索确定表面活性剂界面粘弹性的流变方法。 教育计划:教育计划解决了将本科化学工程课程转向化学产品设计的需要。中心教育目标是在整个课程中介绍产品设计理念,而不仅仅是作为附加产品设计课程。将设计可纳入化学工程现有课程的简短模块,以促进整个课程对化学产品设计的介绍。这些将在新开发的化学产品设计顶点课程中达到高潮。在模块和课程中,所有案例研究都将被选择来强调核心化学工程学科,例如传递现象和热力学。智力优点:聚合物表面活性剂(通常称为“增容剂”)通常用于促进不混溶聚合物的共混。该提议基于这样的想法:相同的表面活性剂也可用于操纵形态。该领域过去研究的主要科学进展是结构的各向异性以及界面上流动和表面活性剂之间的耦合将首次被量化。这项研究将为多相流的流体力学提供基本见解,并为使用表面活性剂控制不混溶聚合物共混物中的结构奠定指导。更广泛的影响:虽然研究将在聚合物系统上进行,但结果适用于所有液-液含有表面活性剂的乳液,例如食品、个人护理产品或石油工业中遇到的乳液。本研究获得的流变性能将指导聚合物共混物加工设备的设计。很大一部分研究将由本科生完成。向世界各地的教师提供的产品设计模块可能会影响其他化学工程系的产品设计教学法。 可行性:PI 在此涵盖的研究主题方面拥有广泛的知识和实验技能。 所有必要的实验资源要么可用,要么将在本研究期间购买。该部门全心全意支持教育计划中提出的课程改革。
项目成果
期刊论文数量(0)
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科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Sachin Velankar其他文献
Interfacially compatibilized PI/PDMS blends with reduced octadecylamine-functionalized graphene oxide: morphological and rheological properties
- DOI:
10.1039/d1sm01057c - 发表时间:
2021-10 - 期刊:
- 影响因子:3.4
- 作者:
Jaber Nasrollah Gavgani;Fatemeh Goharpey;Sachin Velankar - 通讯作者:
Sachin Velankar
Tuning of thermoresponsive pNIPAAm hydrogels for the topical retention of controlled release ocular therapeutics
- DOI:
10.1039/c8tb02976h - 发表时间:
2019-01 - 期刊:
- 影响因子:7
- 作者:
Elena Bellotti;Morgan V. Fedorchak;Sachin Velankar;Steven R. Little - 通讯作者:
Steven R. Little
Sachin Velankar的其他文献
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{{ truncateString('Sachin Velankar', 18)}}的其他基金
Fundamentals of co-crystallization of polyoxacyclobutane and water
聚氧杂环丁烷和水共结晶的基本原理
- 批准号:
1933037 - 财政年份:2019
- 资助金额:
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Continuing Grant
The Dynamic Topography of the Blood-Contacting Surface of Arteries
动脉血液接触面的动态地形
- 批准号:
1824708 - 财政年份:2018
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Standard Grant
I-Corps: Morphing surfaces for anti-fouling applications
I-Corps:用于防污应用的变形表面
- 批准号:
1744148 - 财政年份:2017
- 资助金额:
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Standard Grant
I-Corps: Morphing surfaces for anti-fouling applications
I-Corps:用于防污应用的变形表面
- 批准号:
1744148 - 财政年份:2017
- 资助金额:
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Standard Grant
Collaborative Research: Wrinkling and Folding of Thin Films on Viscoelastic Substrates by Experiments and Modeling
合作研究:通过实验和建模研究粘弹性基底上薄膜的起皱和折叠
- 批准号:
1561789 - 财政年份:2016
- 资助金额:
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Standard Grant
Collaborative Research: Wetting Phenomena in Particle-Filled Polymers: Multifunctional Composites with Easy Processability
合作研究:颗粒填充聚合物中的润湿现象:易于加工的多功能复合材料
- 批准号:
1435461 - 财政年份:2014
- 资助金额:
-- - 项目类别:
Standard Grant
Structure and flow in solid/fluid/fluid systems: Model studies using immiscible polymer blends
固体/流体/流体系统中的结构和流动:使用不混溶聚合物共混物的模型研究
- 批准号:
1336311 - 财政年份:2013
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Standard Grant
EAGER: Thermoplastic Foams Stabilized with Interfacially-Active Particles
EAGER:用界面活性颗粒稳定的热塑性泡沫
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1252850 - 财政年份:2012
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Standard Grant
U.S.-India Planning Visit: Collaborative Research on Polyactic Acid Ionomers.
美印计划访问:聚乳酸离聚物合作研究。
- 批准号:
1037189 - 财政年份:2010
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Standard Grant
Particles at polymer/polymer interfaces: Interfacial phenomena and morphology control in immiscible polymer blends
聚合物/聚合物界面处的颗粒:不混溶聚合物共混物中的界面现象和形态控制
- 批准号:
0932901 - 财政年份:2009
- 资助金额:
-- - 项目类别:
Continuing Grant
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