链式转移
聚合
可逆加成-断裂链转移聚合
活性自由基聚合
自由基聚合
光化学
分散性
化学
光催化
单体
聚合物
材料科学
高分子化学
有机化学
催化作用
作者
Yujin Wang,Chao Bian,Wei Feng,Naitao Yang
标识
DOI:10.1016/j.eurpolymj.2022.111118
摘要
Focusing on energy-saving and environmentally-friendly polymerization engineering, ultrasonication and light were employed as coupled physical stimuli to regulate solvent-free reversible addition fragmentation chain transfer polymerization (RAFT), atom transfer radical polymerization (ATRP) and iodine transfer polymerization (ITP). The solvent-free polymerizations of (meth)acrylate under different conditions were performed with good control even at high monomer conversion (>90%), yielding polymers with low values of dispersity and retention of chain-end functionality. Kinetic experiments and mechanistic insights confirmed that light triggered different photocatalytic pathways (e.g. oxidative quenching cycle for RAFT, reductive quenching cycle for ATRP, photogenerated radical species for ITP) to initiate and mediate the solvent-free polymerizations and ultrasonication was used as an effective process intensification method to improve the diffusive of photocatalysts and their derivatives to alleviate the diffusional limitations for keeping good control up to high monomer conversion. This as-developed strategy is proved to be an efficient technology to produce well-defined polymers without complicated processes of products separation from solvent and residual monomer removal.
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