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-0107168S。 K. Mallapragada，爱荷华州立大学该提案代表了爱荷华州立大学（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 博士和以色列理工学院的 Joseph Miltz 博士之间的三方合作成果。 ），致力于研究半结晶聚合物包装材料的多组分干燥机理。这项合作是在 1999 年 3 月由美国国家科学基金会主办、在以色列海法举行的美国-以色列-土耳其三方研讨会期间发起的。溶剂去除是包装材料、粘合剂等众多产品生产中的关键加工步骤。胶带、照相胶片和各种功能涂层，其中许多是由半结晶聚合物制成的。该合作项目的目的是研究多组分溶剂去除的机理以及干燥过程中半结晶聚合物结晶度和微观结构的变化。反过来，这对包装等各种应用的聚合物的最终性能有很大影响。所使用的重要包装材料之一是醋酸纤维素 (CA)，它将成为模型系统。将采用涉及实验研究和数学建模的双管齐下的方法来处理食品包装应用中半结晶聚合物的多组分干燥问题，以优化干燥条件和干燥机设计。具体研究目标是： 1. 开发半结晶聚合物薄膜中溶剂去除的多组分模型。2．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。以此研究CA薄膜的干燥机理并验证模型。 3．研究 CA 薄膜的干燥条件对其作为包装材料的特性的影响。评估薄膜的气体渗透性及其机械性能随干燥条件的变化。 这项工作还代表了第一个为预测半结晶聚合物的非等温多组分干燥动力学而开发的模型。通过使用合适的参数值，该模型将适用于任何聚合物-溶剂系统。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成为可能。