Supercritical carbon dioxide and polymers: an interplay of science and technology

Abstract

The increasing use of supercritical carbon dioxide (scCO 2 ) as a green solvent for polymer synthesis and processing reflects a still growing interest at academic and industrial level. The peculiar characteristics of scCO 2 , namely its plasticizing effect on polymeric structures and the enhanced chain mobility, render it an ideal medium for polymer synthesis and processing. The broad range of processes as well as of the polymeric structures often requires a deeper understanding of the effect of scCO 2 on polymeric structures at microscopic, mesoscopic and macroscopic levels. The aim of the present paper is to offer a perspective on this topic by outlining current and future challenges in this field.

Advances of supercritical CO<sub>2</sub> application in porous materials synthesis

“…该方法制备过程简单, 且产品易从scCO 2 分 离, 为金属负载MOF材料的制备提供了一种新的方 法. Wu等人 [46] 对由该方法制备的Ru@Zr-MOF作了更 [48] 提出. Cooper等人 [49] 另外, 基于二氧化碳在较温和条件下的相多变 性 [54] (即临界条件较温和), 在合成聚合物多孔材料 时 , scCO 2 可以同时充当分散相、转化媒介和聚合 点 [55] . 这对于减少工艺成本和环保等方面都有很强 的实际意义.…”

Green process for green materials: viable low-temperature lipase-catalysed synthesis of renewable telechelics in supercritical CO 2

“…Unfortunately, this is not always desirable and extra steps can impact dramatically upon the viability of a commercial process. In recent years interest in the use of compressed CO2 as a reaction medium or plasticiser for polymer synthesis and processing has increased steeply (32)(33)(34)(35). CO2 has been exploited as a solvent for polymerisations (36,37), as a foaming agent (32,38), for precipitation/separation (39), particle formation (40,41) and encapsulation (42).…”

“…In recent years, interest in the use of compressed CO 2 as a reaction medium or plasticizer for polymer synthesis and processing has increased steeply [32][33][34][35]. CO 2 has been exploited as a solvent for polymerizations [36,37], as a foaming agent [32,38], for precipitation/separation [39], particle formation [40,41] and encapsulation [42].…”

High-pressure rheological analysis of CO2-induced melting point depression and viscosity reduction of poly(ε-caprolactone)

“…There is no doubt that highpressure studies for the development and optimisation of CO 2 -assisted polymer processing techniques are topical and timely [3].…”

“…In recent years there has been increasing interest in the use of high-pressure CO 2 as a reaction medium or plasticiser for polymer synthesis and processing [1][2][3][4][5][6]. CO 2 has been exploited as a solvent for polymerisations [7,8], as a foaming agent [1,[9][10][11][12][13], for precipitation/separation [14], particle formation [15,16] and encapsulation [17].…”