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; 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.

使用视图池（Isopleth方法），将确定针对聚乙烯 - 丙烷系统（包括固液和液态气相边界）的相位平衡。 这种方法在早期使用100至130度的未分流聚乙烯和9,000至11,000 psi的工作中成功。 数据将收集到高密度聚乙烯的分数上。 还将研究结晶过程中搅拌对聚合物形态的影响。 数据将用于设计和测试半连续过程，通过从超临界流体的结晶来分馏高密度聚乙烯。 尽管已经证明聚合物可以通过超临界流体的分子量分离，但这种过程基于液相和气相的共存。 此处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开发高级工程材料的情况下起着核心作用。 晚期聚合物制造的一个关键方面是生产具有狭窄分子量分布的聚合物。 通过经济地通过分子量分子在聚合后分离聚合物分子，该技术成为生产晚期材料的另一种工具。