Open AccessPolylactic acid macromonomer radical propagation kinetics and degradation behaviour
Author(s) -
Thomas R. Rooney,
Davide Moscatelli,
Robin A. Hutchinson
Publication year - 2017
Publication title -
reaction chemistry and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.132
H-Index - 29
ISSN - 2058-9883
DOI - 10.1039/c7re00019g
Subject(s) - macromonomer , polylactic acid , hydrolytic degradation , hydrolysis , kinetics , degradation (telecommunications) , polymer chemistry , chemistry , materials science , organic chemistry , computer science , polymer , copolymer , physics , telecommunications , quantum mechanics
Polylactic acid ethyl ester methacrylate (PLANEMA) macromonomers are synthesized with N = 1, 5, 7, and 9 average number of polyester units. While propagation rate coefficients (kp) determined by pulsed laser polymerization experiments for bulk PLA1EMA and PLA5EMA are not significantly different over the 40–100 °C temperature range, they are elevated by 60% compared to methyl methacrylate, indicating that the nature of substituents several units beyond the methacrylic group does not decisively impact bulk kp measurements. Compared to bulk PLA5EMA, the apparent kp in 75 wt% n-butanol solution is enhanced due to hydrogen bonding, whereas in 75 wt% dimethylformamide solution it is reduced by 35% because of differences in macromonomer and solvent molar volumes. The PLA5EMA macromonomers are used to produce nanoparticles (NP) by emulsion radical polymerization that degrade almost four times more slowly than NPs produced from their hydroxyl terminated macromonomer counterpart.
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