GOALI: Defining Dynamic Morphology, Order-Disorder Transitions, and Interfaces in Gradient Copolymers

目标：定义梯度共聚物中的动态形态、有序-无序转变和界面

• 批准号: 1203848
• 负责人: Jeff White
• 金额: $ 35.7万
• 依托单位: Oklahoma State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-05-01 至 2016-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1203848&HistoricalAwards=false
• 关键词: GOALI; Defining; Dynamic; Morphology; Order

TECHNICAL SUMMARY Advances in materials science occur when synthesis and detailed characterization methods combine to generate new understanding. In this GOALI project, the collaborators will use anionic polymerization to create gradient copolymers with systematic variations in the interfacial dimensions and co-monomer contents. A fundamental premise of the work is that the interfacial transition zones are active components of the overall morphological character of gradient copolymers and play a very important role in final physical properties. The collaborative research team plans to demonstrate that systematic tailoring of the interface in gradient copolymers, with the same overall chemical composition, can lead to a range of final polymer properties. New solid-state NMR experimental strategies, developed in the PI's laboratory, will be an integral part of the project since these methods offer the potential to detect changes in rigid and mobile fractions at the chain level, and identify if one or both co-monomers can occupy different distinct morphological regions. The proposed strategy offers the key benefit of providing component-specific data for each co-monomer component in heterogeneous gradient copolymers across wide temperature ranges. Deliberate mixed-morphology materials will be created and analyzed to discern if physical property improvements (e.g., in impact strength and/or flex modulus) are possible through tailored construction of the amorphous interfacial regions.NON-TECHNICAL SUMMARYProfessor Jeffery White and his research group, in collaboration with Chevron Phillips Chemical Company, seek to discover how to control the creation of useful new materials made from existing macromolecules, but in new ways. These new types of materials are called gradient copolymers, which are created from different types of large molecules that are chemically bonded in different sequences. The collaborators have found through preliminary experiments that relatively small regions out of the total material synthesized, known as the interface (since it corresponds to the transitions in the different types of molecules bonded together), actually have a large impact on the overall bulk behavior of the material. In an effort to find out the contribution of each type of molecule in the mixture that gives rise to desirable or undesirable end properties, advanced characterization experiments have been and will continue to be developed. The unique feature of these types of experiments is that they have the potential to specify which types of molecular structures in the overall material have the largest impact on desirable bulk behavior. Due to the special aspects of this collaboration between university and industrial scientists within the State of Oklahoma, students from all levels will have the opportunity to participate in research, and observe differences in the practice of science and technology in academic and industrial environments. Further, these intelligent schemes for making new materials appear suitable for eliminating the necessary addition of environmentally deleterious additives that have caused problems in earlier materials.

当综合和详细表征方法结合起来以产生新的理解时，材料科学的技术摘要进展就会发生。 在此目标项目中，合作者将使用阴离子聚合来创建具有系统变化的梯度共聚物，并在界面尺寸和共同工程师中有系统性变化。 这项工作的一个基本前提是，界面过渡区是梯度共聚物总体形态特征的积极组成部分，并且在最终物理特性中起着非常重要的作用。 协作研究团队计划证明，具有相同整体化学成分的梯度共聚物中界面的系统量身定制可以导致一系列最终聚合物性能。 在PI实验室中开发的新的固态NMR实验策略将是该项目不可或缺的一部分，因为这些方法提供了检测链级上刚性和移动分数的变化的潜力，并确定一个或两个共同工人是否可以占据不同的不同形态区域。提出的策略为在宽温度范围内提供异质梯度共聚物中的每个共同分量组件提供特定于组件的数据的关键好处。 将通过量身定制的无定形界面区域的构造来创建和分析故意的混合形态材料，以辨别是否可以通过量身定制的构造物理财产改善（例如，影响力和/或flex模式）。Non-technical-technical-technical SommaryProfefersor White及其研究小组，与Chevron Phirlips Companie的合作，以创建有效的材料，以创建有效的材料，从而使MOTOR的创建有效，从而创建了有效的材料，以创建有效的材料。新方法。 这些新型的材料称为梯度共聚物，它们是由不同类型的大分子产生的，这些分子以不同的序列化学键合。 合作者通过初步实验发现了合成的总材料（称为界面）中相对较小的区域（因为它与键合在一起的不同类型的分子中的过渡相对应），实际上对材料的整体体积行为产生了很大的影响。 为了找出混合物中每种类型的分子的贡献，产生了理想或不良的末端特性，先进的表征实验已经并且将继续开发。 这些类型的实验的独特特征是，它们有可能指定整体材料中哪种类型的分子结构对所需的批量行为的影响最大。 由于俄克拉荷马州州立大学和工业科学家之间的这种合作的特殊方面，来自各个层次的学生将有机会参与研究，并观察学术和工业环境中科学和技术实践的差异。 此外，这些用于制造新材料的智能方案似乎适合消除必要的环境有害添加剂，这些添加剂在早期材料中引起了问题。