![]() ![]() Piezoelectrically Mediated Reversible Addition–Fragmentation Chain-Transfer Polymerization. Chengqiang Ding, Yuhan Yan, Yuhao Peng, Danming Wu, Hang Shen, Jiandong Zhang, Zhao Wang, Zhengbiao Zhang.Microdroplet-Mediated Radical Polymerization. Kyoungmun Lee, Hyun-Ro Lee, Young Hun Kim, Jaemin Park, Suchan Cho, Sheng Li, Myungeun Seo, Siyoung Q.This article is cited by 30 publications. No polymerization occurred in the absence of US demonstrating excellent temporal control, and the polymer products were found to possess high chain-end fidelity via chain extension and MALDI-TOF mass spectroscopy. Several factors were found to influence the final monomer conversion (25–92%) and the upper limit of molecular weight (20–30 kDa) such as the monomer vapor pressure and solubility, solvent choice, and polymer type. Methacrylates were found to be less controlled. The polymerization of acrylates and acrylamides was well controlled with the prepared polymers displaying good agreement between theoretical and experimental molecular weights with low dispersities. ![]() In this way, polymers could be prepared without conventional radical initiators (e.g., AIBN) or additives (e.g., piezoelectric nanoparticles). Acoustic cavitation, induced by high-frequency ultrasound (US) (490 kHz), caused pyrolysis of organic solvent molecules providing a source of initiating radicals. Sonochemically initiated RAFT polymerization (sonoRAFT) in organic solvents is presented for the first time. ![]()
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