Polylactic acid macromonomer radical propagation kinetics and degradation behaviour

被引：12

作者：

Rooney, Thomas R. ^{[1
]}

Moscatelli, Davide ^{[2
]}

Hutchinson, Robin A. ^{[1
]}

机构：

[1] Queens Univ, Dept Chem Engn, Dupuis Hall, Kingston, ON K7L 3N6, Canada

[2] Politecn Milan, Dept Chem Mat & Chem Engn Giulio Natta, Via Luigi Mancinelli 7, I-20131 Milan, Italy

来源：

REACTION CHEMISTRY & ENGINEERING | 2017年 / 2卷 / 04期

基金：

加拿大自然科学与工程研究理事会;

关键词：

PULSED-LASER POLYMERIZATION; RING-OPENING POLYMERIZATION; EVALUATED RATE COEFFICIENTS; PLA-BASED NANOPARTICLES; GRAFT-COPOLYMERS; HYDROLYTIC DEGRADATION; METHYL-METHACRYLATE; POLY(LACTIC ACID); TERMINATION KINETICS; ITACONIC ANHYDRIDE;

D O I：

10.1039/c7re00019g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Polylactic acid ethyl ester methacrylate (PLA(N)EMA) macromonomers are synthesized with N = 1, 5, 7, and 9 average number of polyester units. While propagation rate coefficients (k(p)) determined by pulsed laser polymerization experiments for bulk PLA(1)EMA and PLA(5)EMA are not significantly different over the 40-100 degrees 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 k(p) measurements. Compared to bulk PLA(5)EMA, the apparent k(p) 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 PLA(5)EMA 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.

引用

页码：487 / 497

页数：11

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