GOALI - Fundamental Studies of Microstructure and Property Development in Novel Latex Coatings

GOALI - 新型乳胶涂料微观结构和性能发展的基础研究

• 批准号: 0967348
• 负责人: Lorraine Francis
• 金额: $ 31.42万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-07-15 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0967348&HistoricalAwards=false
• 关键词: GOALI; Fundamental; Studies; Microstructure; Property

Intellectual Merit: This collaborative research explores the fundamentals of microstructure and property development in coatings created from engineered latex particles developed at Arkema, Inc. Arkema is a leading supplier of specialty chemicals that are used in the coatings industry and has been an innovator in the development of synthetic routes to new latex particles. The University of Minnesota has developed advanced techniques to monitor structure and property development in situ during drying and via time sectioning methods in which the coating is frozen at different stages of structure development and then examined in the frozen state by cryogenic scanning electron microscopy (cryoSEM). The overall aim of the research is to advance the understanding of the film formation and structure development in latex coatings using model systems that are industrially relevant and well suited to fundamental research. Two novel latex systems will be explored in this research: (1) block copolymer latex and (2) fluoropolymer acrylic latex. The block copolymer latex consists of nanostructured particles with a combination of hard and soft blocks in a microphase separated nanostructure. The role of this nanostructure on film formation is not understood. The objective of this part of the research is to connect the nanostructure of block copolymer latex particles with the film formation process and the final structure of the coating. Model block copolymer latex with a range of chemistries and morphologies will be synthesized at Arkema. CryoSEM will be used to track the development of structure during film formation so that connections to nanostructure can be made. The stages in structure development, from discrete particles through compaction and deformation to the final coalesced film, will be imaged in frozen specimens. AFM studies will complement the research. With the fluoropolymer-acrylic latex, the main objective is to characterize film formation and relate the structure development to stress and cracking. Understanding and controlling cracking is important to the application of latex materials. Arkema will provide model materials formulated with and without a coalescing aid. CryoSEM studies will be carried out in parallel with measurements of weight loss and stress development and observations of cracking in order to determine the origin of the stress that causes cracking and the role of the latex particle structure on the phenomenon. The second objective is to use a broader set of particles to explore connections between particle and process parameters on cracking, and ultimately to develop strategies to mitigate cracks.Broader Impacts: This research will impact the fields of coating processing, colloidal science, materials characterization, and particle mechanics. The results will broadly apply to other latex materials, feeding a growing effort in industry to replace solvent based polymer coatings with water-based latex coatings. The research will help to advance the scientific understanding so that companies can meet the challenges they face as they seek to improve the environment. The impact of the research will extend to multiple groups of students. First, the research will help the career development of the graduate student as well as the undergraduate researchers, who will join the effort in the summers. These students will learn not only from the research itself but also from the interactions with academic and industrial scientists. Second, the graduate students in the home department of the academic PIs will have the opportunity to participate in an industrial roundtable that involves the Arkema PIs. Third, a new experiment will be designed for an undergraduate course in Materials Processing. The students will design coating formulations to make a Cool Roof? using the fluoropolymer acrylic latex. Lastly, the PIs will develop a learning module that introduces K-12 students to engineering concepts, an important topic in light of recent changes to the science standards in the State of Minnesota. The module will also be built on basic concepts in film formation and will include engineering of a Cool Roof. A high school science teacher will join the team to help with the research and the development of the learning module. The Arkema Foundation will make the learning module available through its summer program for science teachers.

知识分子优点：这项合作研究探讨了由Arkema，Inc。Inc.工程的乳胶颗粒创建的微观结构和房地产开发的基础。Arkema是涂料行业中使用的领先特种化学品的领先供应商，并且一直是与NEW乳胶颗粒合成路线开发的创新者。明尼苏达大学已经开发了高级技术，以在干燥期间和通过时间切片方法来监测结构和财产开发，其中涂层在结构发展的不同阶段被冷冻，然后通过低温扫描电子显微镜（Cryosem）在冷冻状态进行检查。该研究的总体目的是使用具有工业相关且非常适合基础研究的模型系统来促进乳胶涂料中对电影形成和结构开发的理解。 这项研究将探索两个新型的乳胶系统：（1）嵌段共聚物乳胶和（2）氟聚合物丙烯酸乳胶。块共聚物乳胶由纳米结构的颗粒组成，在微相分离的纳米结构中结合了硬质和软块。该纳米结构在膜形成中的作用尚不清楚。这一研究的目的是将块共聚物乳胶颗粒的纳米结构与膜形成过程和涂层的最终结构联系起来。模型块共聚物乳胶具有一系列化学和形态，将在Arkema合成。冷冻物将用于跟踪膜形成过程中结构的发展，以便可以与纳米结构进行连接。从离散的颗粒到压实和变形到最终合并膜的结构发展的阶段将在冷冻样品中成像。 AFM研究将补充研究。借助荧光聚合物 - 丙烯酸乳胶，主要目标是表征膜形成，并将结构发展与压力和破裂联系起来。理解和控制破裂对于乳胶材料的应用很重要。 Arkema将提供有或没有合并辅助的模型材料。低温研究将与重量损失和应力发展的测量以及裂纹的观察结果并行进行，以确定引起裂纹的应力的起源以及乳胶粒子结构在现象中的作用。第二个目标是使用更广泛的颗粒来探索粒子和过程参数之间的联系，并最终制定策略来减轻裂纹。BRODER的影响：这项研究将影响涂料处理，胶体科学，材料特征和粒子力学的领域。结果将广泛地适用于其他乳胶材料，从而为工业中的努力提供了越来越多的努力，从而用水基乳胶涂料代替了溶剂的聚合物涂料。 这项研究将有助于提高科学理解，以便公司在寻求改善环境时面临的挑战。 研究的影响将扩展到多组学生。首先，这项研究将有助于研究生以及本科研究人员的职业发展，他们将在夏季加入这项工作。这些学生不仅将从研究本身中学习，而且还可以从与学术和工业科学家的互动中学习。其次，学术PIS内部部门的研究生将有机会参加涉及Arkema PI的工业圆桌会议。第三，将为材料处理的本科课程设计一个新的实验。学生将设计涂料配方以制造凉爽的屋顶？使用氟聚合物丙烯酸乳胶。最后，PI将开发一个学习模块，该模块将K-12学生介绍到工程概念，这是明尼苏达州科学标准的最新变化，这是一个重要的主题。该模块还将建立在膜形成中的基本概念上，并包括凉爽屋顶的工程。一位高中科学老师将加入团队，以帮助学习模块的研究和发展。 Arkema基金会将通过其夏季科学教师计划提供学习模块。