权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

DEVELOPMENT OF NEW POLYETHYLENE HOLLOW FIBER MEMBRANE WITH ASYMMETRIC STRUCTURE USED FOR WATER RECYCLE SYSTEM

水循环系统用新型不对称结构聚乙烯中空纤维膜的研制

基本信息

批准号：
14550749
负责人：
MATSUYAMA Hideto
金额：
$ 2.3万
依托单位：
KYOTO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

1. Effect of extraction and drying on microporous polyethylene membrane structureTen different extractant and were used to remove mineral oil from polyethylene films and two different evaporation conditions were used to remove the extractant and produce microporous membranes. The dimension, microstructure and permeability of the membranes were used to measure the impact of extractant choice and drying conditions on the membrane morphology. The solubility parameters, boiling points and surface tensions of the extractants were related to the membrane morphology.2. Thermodynamic and kinetic studies on the poly (ethylene-co-vinyl alcohol) (EVOH) membrane formation by thermally induced phase separationThe liquid-liquid phase boundaries (binodal line) was shifted to higher temperature when ethylene content in EVOH increased. For EVOHs with ethylene content of 32-44 mol%, cellular pores were formed, while only polymer crystallization occurred for EVOH with 27 mol% ethylene content.3. preparation and Characteristics of polyethylene and EVOH hollow fiber membranes via thermally induced phase separationMicroporous PE and EVOH membranes were prepared by TIPS process. The effects of the experimental condition such as polymer molecular weight, air gap distance, cooling bath composition and ethylene content of EVOH on the membrane performance were investigated in detail.4. Simulation of asymmetric structure formation via thermally induced phase separationAsymmetric membranes having smaller pores at one side and larger pores at the other side were prepares by TIPS of polypropylene-diphenyl ether solution with polymer concentration gradient. The simulation of phase separation process by the spinodal decomposition was carried out based on Cahn-Hilliard model. The simulation results of pore size and the thickness of skin layer were approximately in agreement with the experimental results.

1.萃取和干燥对聚乙烯微孔膜结构的影响采用10种不同的萃取剂和2种不同的蒸发条件对聚乙烯微孔膜进行了萃取和干燥，并对萃取剂和膜的结构进行了表征。膜的尺寸，微观结构和渗透性被用来衡量萃取剂的选择和干燥条件对膜形态的影响。萃取剂的溶解度参数、沸点和表面张力与膜的形态有关.乙烯-乙烯醇共聚物（EVOH）热致相分离成膜的热力学和动力学研究随着EVOH中乙烯含量的增加，液-液相界（双峰线）向高温移动。乙烯含量为32-44 mol%的EVOH均形成泡孔，而乙烯含量为27 mol%的EVOH仅发生聚合物结晶.热致相分离法制备聚乙烯（PE）和乙烯-乙烯醇共聚物（EVOH）中空纤维膜的研究详细研究了聚合物分子量、气隙距离、冷却浴组成、乙烯含量等实验条件对膜性能的影响.热致相分离过程中不对称结构形成的模拟研究采用聚丙烯-二苯醚溶液的TIPS法，在聚合物浓度梯度下，制备了一侧孔较小，另一侧孔较大的不对称膜。基于Cahn-Hilliard模型对旋节线分解相分离过程进行了模拟。模拟得到的孔径和皮层厚度与实验结果基本一致。