Thermo and pH-Responsive Poly(DEGMA-co-OEGMA)-b-Poly(DEAEM) Synthesized by RAFT Polymerization and Its Self-Assembly Study
Drug delivery and release systems using stimuli-responsive nanostructures based on amphiphilic copolymers have gained great importance. In this work copolymers from oligo(ethylene glycol) methyl ether methacrylate (OEGMA) and di(ethylene glycol) methyl ether methacrylate (DEGMA) as thermo-responsive...
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Published in | Macromolecular research Vol. 30; no. 12; pp. 917 - 929 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Seoul
The Polymer Society of Korea
01.12.2022
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Drug delivery and release systems using stimuli-responsive nanostructures based on amphiphilic copolymers have gained great importance. In this work copolymers from oligo(ethylene glycol) methyl ether methacrylate (OEGMA) and di(ethylene glycol) methyl ether methacrylate (DEGMA) as thermo-responsive moiety and block copolymers incorporating
N,N′
-diethylaminoethyl methacrylate (DEAEM) as pH-responsive one, were synthesized by reversible addition-fragmentation chain transfer polymerization (RAFT) using 5-amino-4-methyl-4-(propylthiocarbonothioylthio)-5-oxo pentanoic acid as chain transfer agent (CTA). The number average molecular weights (
M
n
), and dispersity
Đ
confirmed a good RAFT control. Polymers were characterized by Fourier transform infrared spectroscopy using a attenuated total reflection (FTIR-ATR), nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic light scattering (DLS), transmission electron microscope (TEM), and Turbidimetry. Their self-assembly behavior is described by its hydrodynamic diameter (
D
h
), its
ζ
-potential and as well as its cloud point temperature (
T
cp
). The results showed thermo-responsive and pH-responsive systems with
T
cp
in phosphate-buffered saline (PBS) pH=7.4 around 37 and 42 °C the isoelectric point was found in a pH range between 7.0 and 7.5, further the critical micelle concentration (CMC) indicated very low values between 5.85 to 4.20 × 1(0
−4
mg ml/
−1
. The developed block copolymeric systems have potential to be used for drug transport and delivery. |
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ISSN: | 1598-5032 2092-7673 |
DOI: | 10.1007/s13233-022-0093-x |