The properties of thermo-sensitive polymers can be easily and reversibly switched using addition/removal of carbon dioxide (CO) as an innovative and ecological trigger. ,-(diethylamino)ethyl acrylamide (DEAEAM) was copolymerized with -isopropylacrylamide (NIPAM) by Reversible Addition-Fragmentation chain Transfer (RAFT) polymerization to obtain copolymers with various compositions and architectures. The properties (solubility, aggregation behavior…) of these polymers in aqueous solution in the presence of CO was studied via scattering, microscopy and turbidimetry measurements. The copolymerization of DEAEAM monomer with NIPAM enables to produce either statistical or diblock copolymers and to tune the cloud point temperature of obtained copolymers either by changing the composition or the architecture (statistical, block) or by CO addition/removal. Whereas, for a given composition, statistical copolymer does not display thermoresponsive behavior, block copolymers present a thermoresponsiveness which depends on the protonation degree of tertiary amine functions. Additionally, CO can be used to reversibly modulate the properties of these materials in aqueous media.

中文翻译：

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聚(N,N-(二乙氨基)乙基丙烯酰胺)基均聚物和共聚物在水中的CO2可切换热响应性


使用二氧化碳 (CO) 的添加/去除作为创新和生态触发因素，可以轻松且可逆地切换热敏聚合物的性能。通过可逆加成-断裂链转移（RAFT）聚合，将α，β-（二乙基氨基）乙基丙烯酰胺（DEAEAM）与β-异丙基丙烯酰胺（NIPAM）共聚，得到不同组成和结构的共聚物。通过散射、显微镜和比浊法测量研究了 CO 存在下这些聚合物在水溶液中的特性（溶解度、聚集行为……）。 DEAEAM 单体与 NIPAM 的共聚能够生产统计共聚物或二嵌段共聚物，并通过改变组成或结构（统计、嵌段）或通过添加/去除 CO 来调节所得共聚物的浊点温度。然而，对于给定的组合物，统计共聚物不表现出热响应行为，而嵌段共聚物呈现出取决于叔胺官能团的质子化程度的热响应性。此外，CO 可用于可逆地调节这些材料在水介质中的性能。