GOALI: Balanced Surfactants for Self-Assembly of Highly Immiscible Polymers

目标：用于高度不混溶聚合物自组装的平衡表面活性剂

• 批准号: 0305711
• 负责人: Nitash Balsara
• 金额: $ 23.58万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-15 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0305711&HistoricalAwards=false
• 关键词: GOALI; Balanced; Surfactants; Self; Assembly

Nitash Balsara - University of California - BerkeleyDavid Lohse - ExxonMobilGOALI: Balanced Surfactants for Self-Assembly of Highly Immiscible PolymersIntellectual Merit of Proposed ActivityThe objective of the proposed work is to build a library of surfactants for controlling the self-assembly in mixtures of highly immiscible polymers. This will enable the creation of newnanostructured polymer materials. It may also enable reusing commingled polymeric waste. The approach represents a departure from the large body of previous experimental and theoretical work in this field which relied on the surfactancy of A-B copolymers for organizing mixtures of A and B homopolymers. It is now recognized that these types of copolymers can only organize interfaces if the homopolymers are weakly immiscible. The surfactant that will be used in the research is a balanced A-C block copolymer. The notion of balance is adapted from the literature on surfactancy in aqueous systems. Nonionic surfactants with balanced hydrophobic and hydrophilic character have been successful in creating nanoscale organization in oil/water mixture in spite of their high degree of incompatibility. The reseserch deals with the application of this principle to polymers. Experiments will be conducted on mixtures of highly immiscible polyolefins, polybutene (PB) and polyisobutylene (PIB). Polybutene-block-ethylenebutene copolymer (PB-EB) copolymer will serve as the surfactant. This system was chosen on the basis of the temperature dependence of the PB/EB and PIB/EB Flory-Huggins interaction parameters. It is expected that the balancing of PIB-philic and PIB-phobic tendencies of the surfactant will lead to the rich varieties of phase behaviors that have, thus far, only been identified in aqueous mixtures. The principle of balance that is being developed is, however, perfectly general, and can be applied to a wide variety of polymer blends. Model polymers required for this study will be synthesized by anionic and cationic polymerization. Self-assembly will be studied by small angle neutron scattering at the National Institute of Standards and Technology (NIST), light scattering, and electron microscopy.Broader Impact of Proposed Activity and GOALI mechanismThe student working on this project will be jointly advised by the PI (at UC Berkeley) and co-PI (at ExxonMobil). The student will spend about 6 weeks every year, working at the ExxonMobil Corporate Research Labs in Annandale, NJ. All of the expenses associated with the visit (lodging, travel, lab supplies, etc.) will be paid by ExxonMobil. The framework for this collaboration has already been established: the PhD student spent 2 weeks this past summer at ExxonMobil, learning about polymer synthesis, and obtaining safety training and clearances to work in the ExxonMobil Labs. Exposure to an industrial research lab will add a new dimension to the student's education. Since the project will involve several visits to the NIST, the student will learn about the functioning of government laboratories. The materials and samples that will be synthesized and characterized will be used in teaching courses on both thermodynamics and polymer science at Berkeley, and at other institutions such as NIST.

Nitash Balsara-加利福尼亚大学 - 伯克利亚达维德·洛斯（Berkeleydavid Lohse）-Exxonmobilgoali：均衡的表面活性剂，用于自我组装的高度不混乱的多种多样的活动优点，该活动的目标是拟议的工作目标是建立一个表面活性库，以建立一个以高度imbimissibsiblesiblesibsibsiblesibsibsibsibsibsibsibsibsibles的混合物来构建自我组件的图书馆。这将使创建NewnAnostructred聚合物材料。它也可能使重复使用混合的聚合物废物。 该方法代表了该领域先前的实验和理论工作的大体系，依赖于A-B共聚物组织A和B均聚物的混合物的表面作用。 现在已经认识到，这些类型的共聚物只能在均质物质弱不混溶的情况下组织界面。 研究中将使用的表面活性剂是平衡的A-C块共聚物。 平衡的概念是根据水性系统表面效果的文献所调的。 尽管高度不兼容，但具有平衡疏水性和亲水性特征的非离子表面活性剂在油/水混合物中已经成功地在油/水混合物中建立了纳米级组织。撤退涉及该原理在聚合物中的应用。 实验将在高度不混溶的聚烯烃，多丁烯（PB）和聚异丁基（PIB）的混合物上进行。聚丁烯二乙烯 - 乙二烯共聚物（PB-EB）共聚物将用作表面活性剂。 该系统是根据PB/EB和PIB/EB Flory-Huggins相互作用参数的温度依赖性选择的。可以预期，表面活性剂的PIB-噬菌体和PIB恐惧趋势的平衡将导致到目前为止仅在水性混合物中鉴定出来的丰富品种。 但是，正在开发的平衡原理是完全一般的，并且可以应用于多种聚合物混合物。 本研究所需的模型聚合物将通过阴离子和阳离子聚合合成。 自组装将通过国家标准技术研究所（NIST），光散射和电子显微镜的小角度中子散射来研究。拟议活动和守门员机制对该项目的学生的影响将由PI（UC Berkeley）和Co-Pi（在ExxonMobil）共同建议。 该学生每年将花费大约6周的时间，在新泽西州Annandale的Exxonmobil企业研究实验室工作。与访问相关的所有费用（住宿，旅行，实验室用品等）将由埃克森美孚（Exxonmobil）支付。这项合作的框架已经建立：去年夏天，博士生在埃克森美孚（Exxonmobil）度过了2周，学习了聚合物合成，并获得了在埃克森美孚（Exxonmobil）实验室工作的安全培训和许可。接触工业研究实验室将为学生的教育增加一个新的维度。由于该项目将涉及对NIST的几次访问，因此学生将了解政府实验室的功能。将合成和表征的材料和样品将用于伯克利的热力学和聚合物科学的教学课程，以及其他机构（例如NIST）。