One-Step Synthesis of Thermally Curable Hyperbranched Polymers by Addition–Fragmentation Chain Transfer Using Divinyl Monomers. Sato, E., Uehara, I., Horibe, H., & Matsumoto, A. Macromolecules, 47(3):937–943, February, 2014. Publisher: American Chemical SocietyPaper doi abstract bibtex Free radical bulk and solution polymerizations of a divinyl monomer, ethylene glycol dimethacrylate (EGDMA), in the presence of methyl 2-(bromomethyl)acrylate as an addition–fragmentation chain transfer agent were investigated to synthesize thermally curable hyperbranched polymers by a one-step reaction. Soluble polymers were obtained up to high conversion of EGDMA, and the molecular weight and molecular weight distribution of the polymers increased with increasing EGDMA conversion. 1H NMR and MALDI-MS analyses revealed that the soluble polymers were obtained after the consumption of a considerable amount of the pendant methacryloyl groups, and one polymer chain contained a number of end groups indicating the formation of hyperbranched polymers. The isolated hyperbranched polymers underwent thermal curing above 110 °C without curing agents, and the polymers having a large number of pendant methacryloyl groups resulted in a significant increase in glass transition temperature, i.e., from around room temperature to above 210 °C.
@article{sato_one-step_2014,
title = {One-{Step} {Synthesis} of {Thermally} {Curable} {Hyperbranched} {Polymers} by {Addition}–{Fragmentation} {Chain} {Transfer} {Using} {Divinyl} {Monomers}},
volume = {47},
issn = {0024-9297},
url = {https://doi.org/10.1021/ma402300z},
doi = {10.1021/ma402300z},
abstract = {Free radical bulk and solution polymerizations of a divinyl monomer, ethylene glycol dimethacrylate (EGDMA), in the presence of methyl 2-(bromomethyl)acrylate as an addition–fragmentation chain transfer agent were investigated to synthesize thermally curable hyperbranched polymers by a one-step reaction. Soluble polymers were obtained up to high conversion of EGDMA, and the molecular weight and molecular weight distribution of the polymers increased with increasing EGDMA conversion. 1H NMR and MALDI-MS analyses revealed that the soluble polymers were obtained after the consumption of a considerable amount of the pendant methacryloyl groups, and one polymer chain contained a number of end groups indicating the formation of hyperbranched polymers. The isolated hyperbranched polymers underwent thermal curing above 110 °C without curing agents, and the polymers having a large number of pendant methacryloyl groups resulted in a significant increase in glass transition temperature, i.e., from around room temperature to above 210 °C.},
number = {3},
urldate = {2021-08-05},
journal = {Macromolecules},
author = {Sato, Eriko and Uehara, Izumi and Horibe, Hideo and Matsumoto, Akikazu},
month = feb,
year = {2014},
note = {Publisher: American Chemical Society},
pages = {937--943},
}
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