Roka Nikoletta, Papazoglou Theodosia-Panagiota, Pitsikalis Marinos
Industrial Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece.
Polymers (Basel). 2024 Aug 29;16(17):2447. doi: 10.3390/polym16172447.
Amphiphilic block copolymers of N-vinyl pyrrolidone (NVP) and various vinyl esters (VEs), PNVP--PVEs, namely vinyl butyrate (VBu), vinyl decanoate (VDc), and vinyl stearate (VSt), were synthesized through RAFT polymerization techniques. The sequential addition of the monomers methodology was employed starting from the polymerization of NVP followed by the polymerization of the Ves' monomer. The polymerization of NVP was conducted at 60 °C in benzene solution using AIBN as the initiator and O-ethyl S-(phthalimidylmethyl) xanthate as the CTA. The resulting PNVP macro-CTA was further applied for the polymerization of the vinyl ester in dioxane solution at 80 °C using, again, AIBN as the initiator. The block copolymers were characterized through size-exclusion chromatography (SEC) and NMR spectroscopy. The thermal behavior of the copolymers was studied by Differential Scanning Calorimetry (DSC), whereas their thermal stability via Thermogravimetric Analysis (TGA) and Differential Thermogravimetry (DTG).
通过可逆加成-断裂链转移(RAFT)聚合技术合成了N-乙烯基吡咯烷酮(NVP)与各种乙烯基酯(VEs)的两亲性嵌段共聚物PNVP-PVEs,其中乙烯基酯分别为丁酸乙烯酯(VBu)、癸酸乙烯酯(VDc)和硬脂酸乙烯酯(VSt)。采用单体顺序添加法,先进行NVP的聚合,然后进行VEs单体的聚合。NVP的聚合在60℃的苯溶液中进行,以偶氮二异丁腈(AIBN)为引发剂,O-乙基-S-(邻苯二甲酰亚胺甲基)黄原酸酯为链转移剂(CTA)。所得的PNVP大分子CTA再次以AIBN为引发剂,在80℃的二氧六环溶液中进一步用于乙烯基酯的聚合。通过尺寸排阻色谱(SEC)和核磁共振光谱(NMR)对嵌段共聚物进行了表征。通过差示扫描量热法(DSC)研究了共聚物的热行为,而通过热重分析(TGA)和微商热重分析(DTG)研究了它们的热稳定性。