Supercritical Fluid - Crystal Phase Fractionation of Polymers: Polyethylene-Propane

超临界流体 - 聚合物的晶相分级：聚乙烯-丙烷

• 批准号: 8900122
• 负责人: Paul Ehrlich
• 金额: $ 12.95万
• 依托单位: SUNY at Buffalo
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-06-15 至 1991-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8900122&HistoricalAwards=false
• 关键词: Supercritical; Fluid; Crystal; Phase; Fractionation

Phase equilibrince will be determined for the polyethylene - propane system, including both solid-liquid and liquid-gas phase boundaries, using a view cell (isopleth method). This method was successful in earlier work with unfractionated polyethylene at 100 to 130 degrees centigrade and 9,000 to 11,000 psi. Data will be collected on fractions of high density polyethylene. The effect of agitation during crystallization on polymer morphology will also be examined. The data will be used to design and test a semi-continuous process for the fractionation of high density polyethylene by crystallization from a supercritical fluid. Although polymers have been shown to be fractionable by molecular weight from supercritical fluids, such processes have been based on the coexistence of liquid and gas phases. The process attempted here will be based on solid/supercritical gas coexistence. Advanced polymer technology plays a central role in scenarios for development of advanced engineering materials. One critical aspect of advanced polymer manufacturing is production of polymers with a narrow molecular weight distribution. By economically separating polymer molecules by molecular weight after polymerization this technology becomes another tool for producing advanced materials.

聚乙烯-丙烷体系的相平衡，包括固-液和液-气两相界面，将使用观察池(等值线方法)来确定。这种方法在早期对100至130摄氏度和9000至11,000磅/平方英寸的普通聚乙烯的研究中取得了成功。将收集有关高密度聚乙烯馏分的数据。还将研究结晶过程中的搅拌对聚合物形态的影响。这些数据将用于设计和测试从超临界流体中结晶分离高密度聚乙烯的半连续工艺。虽然聚合物已被证明可以从超临界流体中按相对分子质量进行分离，但这种过程是基于液体和气相的共存。这里尝试的过程将基于固体/超临界气体共存。先进的聚合物技术在先进工程材料的开发场景中发挥着核心作用。先进聚合物制造的一个关键方面是生产具有窄分子量分布的聚合物。通过聚合后按相对分子质量经济地分离聚合物分子，这项技术成为生产先进材料的另一种工具。