Journal of Fluorine Chemistry ( IF 1.7 ) Pub Date : 2020-02-06 , DOI: 10.1016/j.jfluchem.2020.109484 Alexandra Grigoreva , Egor Polozov , Sergey Zaitsev
The reversible addition-fragmentation chain transfer (RAFT) polymerization of 2,2,3,3-tetrafluoropropyl methacrylate (TFPMA) in the presence of different chain transfer agents (CTAs) was investigated. It was shown that 2-cyano-2-propyldodecyl trithiocarbonate (CPDT) and 4-cyano-4-[(dodecylsulfanylthiocarbonyl)sulfanyl]pentanoic acid (CDTPA) is more effective to control molar mass characteristics. The Ctr estimate was defined using the size exclusion chromatography measurements, the values are 1.6 (CPDT) and 3.2 (CDTPA). The effect of solvent used in sample preparation in MALDI-TOF MS analysis on PTFPMA spectra resolution was investigated. The use of methanol led to the highest signal/noise ratio. The end-groups analysis was carried out by means of MALDI-TOF MS and MS/MS method. The polymeric RAFT agent provides for lower values of dispersity of obtained polymers as compared to other techniques used (Mn = 10-44 kDa, Đ = 1.16 – 1.3). Moreover, it allows to obtain narrow-disperse fluorocontaining amphiphilic block copolymers with diverse nature of hydrophilic moiety (such as acrylic and methacrylic acid, glycidyl methacrylate, Đ = 1.1 – 1.3).
中文翻译:
甲基丙烯酸2,2,3,3-四氟丙酯的可逆加成-断裂链转移(RAFT)聚合:动力学和结构特征
研究了在不同链转移剂(CTA)存在下甲基丙烯酸2,2,3,3-四氟丙酯(TFPMA)的可逆加成-断裂链转移(RAFT)聚合反应。结果表明2-氰基-2-丙基十二烷基三硫代碳酸酯(CPDT)和4-氰基-4-[(十二烷基硫烷基硫代羰基硫羰基)硫烷基]戊酸(CDTPA)对控制摩尔质量特性更有效。Ctr估计值是使用尺寸排阻色谱测量定义的,值为1.6(CPDT)和3.2(CDTPA)。研究了用于MALDI-TOF MS分析的样品制备中使用的溶剂对PTFPMA光谱分辨率的影响。甲醇的使用导致最高的信噪比。通过MALDI-TOF MS和MS / MS方法进行端基分析。与其他使用的技术(Mn = 10-44 kDa,Đ= 1.16 – 1.3)相比,聚合型RAFT剂可降低所得聚合物的分散度。而且,它可以得到窄分散的含氟两亲嵌段共聚物,该共聚物具有不同的亲水部分性质(例如丙烯酸和甲基丙烯酸,甲基丙烯酸缩水甘油酯,Đ= 1.1 – 1.3)。