Multicomponent Drying of Semicrystalline Polymer Films

abstractcts - 0107168。爱荷华州立大学K. Mallapragada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，土耳其的Sacide Alsoy atIzmir理工学院博士和以色列的Joseph Miltz博士之间的三方合作努力，致力于研究半结晶聚合物包装材料的多组分干燥机制。这一合作努力是在1999年3月在以色列海法举行的由美国国家科学基金会主办的美国-以色列-土耳其三方研讨会期间发起的。溶剂去除是生产大量产品的关键加工步骤，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。本合作项目的目的是研究多组分溶剂的去除机理，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。这反过来又对聚合物的各种应用（如包装）的最终性能产生强烈影响。其中一个重要的包装材料是醋酸纤维素（CA），这将是模型系统。涉及实验调查和数学建模的双管齐下的方法将用于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器设计。具体的研究目标是：1。建立半结晶聚合物膜溶剂去除的多组分模型。实验研究了溶剂诱导CA膜结晶动力学及其对干燥动力学的影响。利用这些研究了CA膜的干燥机理，并对模型进行了验证。研究了干燥条件对CA薄膜包装材料性能的影响。评估薄膜对气体的渗透性及其机械性能作为干燥条件的函数。这项工作也代表了第一个预测半结晶聚合物非等温多组分干燥动力学的模型。通过使用合适的参数值，该模型将适用于任何聚合物溶剂体系。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能够准确预测工业干燥过程。

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.