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首页> 外文期刊>Journal of Applied Polymer Science >Behavior of poly(methyl methacrylate)-based systems in supercritical CO2 and CO2 plus cosolvent: Solubility measurements and process assessment
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Behavior of poly(methyl methacrylate)-based systems in supercritical CO2 and CO2 plus cosolvent: Solubility measurements and process assessment

机译：基于聚（甲基丙烯酸甲酯）的系统在超临界CO2和CO2加助溶剂中的行为：溶解度测量和过程评估

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Microspheres based on synthetic polymers such as poly(methyl methacrylate) (PMMA) and PMMA blends are known for their medical and optical applications. The development of methods for processing polymeric microspheres using a nontoxic solvent, like supercritical carbon dioxide (SCCO2), is desirable. This work investigates the solubility and behavior of polymers (PMMA and PMMA/polycaprolactone blend) and solutes (cholesterol and albumin) in SCCO2 and SCCO2 + cosolvent (acetone, ethanol, and methylene chloride). The knowledge of solubility behavior of materials in SCCO2 aids in the selection and/or design of the most appropriate technique for materials processing. Processing PMMA-based polymers with pure SCCO2 leads to polymer swelling. The lack of polymer solubility in pure CO2 precludes their micronization by the RESS (rapid expansion of supercritical solutions) process, but on the other hand allows their impregnation. Polymer plasticization caused by CO2 can be exploited in the PGSS (particles from gas-saturated solutions) process. Addition of a liquid cosolvent to CO, enhances the dissolution of solutes and polymers. Precipitation of the studied polymers by antisolvent techniques seems feasible only by use of CO2 + methylene chloride. (C) 2003 Wiley Periodicals, Inc. [References: 46]
机译：基于合成聚合物如聚甲基丙烯酸甲酯（PMMA）和PMMA共混物的微球因其医学和光学应用而闻名。期望开发使用无毒溶剂（例如超临界二氧化碳（SCCO2））处理聚合物微球的方法。这项工作研究了聚合物（PMMA和PMMA /聚己内酯共混物）和溶质（胆固醇和白蛋白）在SCCO2和SCCO2 +助溶剂（丙酮，乙醇和二氯甲烷）中的溶解度和行为。对材料在SCCO2中的溶解行为的了解有助于选择和/或设计最适合材料加工的技术。用纯SCCO2处理基于PMMA的聚合物会导致聚合物溶胀。聚合物在纯二氧化碳中的溶解度不足，无法通过RESS（超临界溶液的快速膨胀）工艺将其微粉化，但另一方面却允许其浸渍。在PGSS（气体饱和溶液中的颗粒）工艺中可以利用由CO2引起的聚合物增塑。在CO中添加液态助溶剂可提高溶质和聚合物的溶解度。仅通过使用CO2 +二氯甲烷，通过抗溶剂技术沉淀研究的聚合物似乎是可行的。 （C）2003 Wiley Periodicals，Inc. [参考：46]

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