Experimental Study of High Pressure Copolymer Solution Behavior

本项目的目的是调查 链段-溶剂和链段-共溶剂氢键在 乙烯基共聚物溶液的相行为。 的 实现这一目标的方法是通过实验 研究由以下组成的溶液的相行为 极性/非极性、统计学无规共聚物， 非极性溶剂和共溶剂。 极性和氢 共聚物的键合能力将被系统地 通过控制非极性和极性 聚合物主链中的基团。 溶剂将从 低分子量的非极性烃类， 极性氢键碳氢化合物。 助溶剂，例如 二甲醚和乙醇将与非极性 溶剂，以确定氢键的重要性， 极性对相行为的影响。 浊点曲线和二进制 和三元相图将构建在温度 温度高达448 K，压力高达275 MPa--这些条件 也包括自由基聚合方法， 用于乙烯基共聚物。 数据将被建模 使用Sanchez-Lacombe状态方程， 形式，并在修改后的形式中明确说明氢 前将芯片

The objective of this project is to investigate the role of segment-solvent and segment-cosolvent hydrogen bonding on the phase behavior of ethylene-based copolymer solutions. The approach used to reach this objective is to experimentally investigate the phase behavior of solutions which consist of polar/nonpolar, statistically random copolymers with polar and nonpolar solvents and cosolvents. The polarity and hydrogen bonding capabilities of the copolymers will be systematically varied by controlling the concentration of nonpolar and polar groups in the polymer backbone. The solvents will vary from the low-molecular-weight, nonpolar hydrocarbons to highly polar, hydrogen bonding hydrocarbons. Cosolvents such as dimethyl ether and ethanol will be used with the nonpolar solvents to determine the importance of hydrogen bonding and polarity on the phase behavior. Cloud-point curves and binary and ternary phase diagrams will be constructed at temperatures up to 448 K and at pressures up to 275 MPa--conditions which also bracket the free-radical polymerization process that is used for ethylene-based copolymers. The data will be modeled using the Sanchez-Lacombe equation of state in its present form and in a form revised to explicitly account for hydrogen bonding.