Multicomponent Drying of Semicrystalline Polymer Films

半结晶聚合物薄膜的多组分干燥

• 批准号: 0107168
• 负责人: Surya Mallapragada
• 金额: $ 18.95万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-04-15 至 2005-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0107168&HistoricalAwards=false
• 关键词: Multicomponent; Drying; Semicrystalline; Polymer; Films

AbstractCTS-0107168S. K. Mallapragada, Iowa State UniversityThis proposal represents a tri-national collaborative effort between the principalinvestigator Dr. Surya Mallapragada at Iowa State University (USA), Dr. Sacide Alsoy atIzmir Institute of Technology (Turkey) and Dr. Joseph Miltz at Technion (Israel), devoted toinvestigating the multicomponent drying mechanism of semicrystalline polymer packagingmaterials. This collaborative effort was initiated during the US-Israel-Turkey tripartite workshopsponsored by the National Science Foundation and held in Haifa, Israel in March 1999. Solvent removal is a key processing step in the production of a plethora of products such as packaging materials, adhesive tapes, photographic films and various functional coatings, many of which are made from semicrystalline polymers. The aim of this collaborative project is to investigate the mechanism of multicomponent solvent removal and the changes in the degree of crystallinity and the microstructure of semicrystalline polymers during drying. This, in turn, has a strong effect on the final properties of the polymer for various applications such as packaging. One of the important packaging materials used is cellulose acetate (CA) which will be the model system. A two pronged approach involving experimental investigations and mathematical modeling will be used to deal with the problem of multicomponent drying of semicrystalline polymers in the context of food packaging applications to enable optimization of drying conditions and dryer designs. The specific research objectives are to: 1. Develop a multicomponent model for solvent removal from semicrystalline polymer films.2. Experimentally investigate the solvent induced crystallization kinetics of CA films andtheir effect on the drying kinetics. Use these to investigate the drying mechanism of CA filmsand validate the model.3. Investigate the influence of drying conditions of CA films on their characteristics aspackaging materials. Evaluate the permeability of the films to gases and their mechanicalproperties as a function of drying conditions. This work also represents the first model developed to predict non-isothermal multi-component drying kinetics of semicrystalline polymers. The model will be applicable to any polymer-solvent system by using suitable parameter values. The synergy between molecular understanding and application-based experimentation proposed in this work will enable accurate predictions of industrial drying processes.

摘要CTS-0107168 S。K. Mallapragada，爱荷华州州立大学该提案代表了爱荷华州州立大学（美国）的首席研究员Surya Mallapragada博士、伊兹密尔理工学院（土耳其）的Sacide Alsoy博士和Technion（以色列）的Joseph Miltz博士之间的三国合作努力，致力于研究半结晶聚合物包装材料的多组分干燥机理。这一合作努力是在美国-以色列-土耳其三方研讨会期间发起的，该研讨会由国家科学基金会赞助，于1999年3月在以色列海法举行。溶剂去除是生产多种产品的关键工艺步骤，如包装材料、胶带、照相胶片和各种功能涂料，其中许多产品由半结晶聚合物制成。该合作项目的目的是研究多组分溶剂去除的机理以及半结晶聚合物在干燥过程中结晶度和微观结构的变化。这反过来又对用于各种应用（如包装）的聚合物的最终性质具有强烈的影响。使用的重要包装材料之一是醋酸纤维素（CA），这将是模型系统。一个双管齐下的方法，涉及实验研究和数学建模将被用来处理的问题，多组分干燥的半结晶聚合物的食品包装应用的背景下，使干燥条件和干燥机设计的优化。具体的研究目标是：1.建立了一个多组分模型，用于半结晶聚合物薄膜中溶剂的去除.实验研究了CA薄膜的溶剂诱导结晶动力学及其对干燥动力学的影响.利用这些数据对CA薄膜的干燥机理进行了研究，并对模型进行了验证.探讨了干燥条件对CA薄膜作为包装材料的特性的影响.评估薄膜对气体的渗透性及其作为干燥条件函数的机械性能。 这项工作也代表了第一个模型开发的预测非等温多组分干燥动力学的半结晶聚合物。该模型将适用于任何聚合物-溶剂系统通过使用合适的参数值。在这项工作中提出的分子理解和基于应用的实验之间的协同作用将使工业干燥过程的准确预测。