Journal
MATERIALS
Volume 7, Issue 7, Pages 5305-5326Publisher
MDPI
DOI: 10.3390/ma7075305
Keywords
diblock copolymers; ATRP; ROP; thermal behavior
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Funding
- University Medical Center, Groningen, The Netherlands
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The synthesis of poly(N-isopropylacrylamide)-b-poly(L-lysine) and poly(N-isopropylacrylamide- co-acrylamide)-b-poly(L-lysine) copolymers was accomplished by combining atom transfer radical polymerization (ATRP) and ring opening polymerization (ROP). For this purpose, a di-functional initiator with protected amino group was successfully synthetized. The ATRP of N-isopropylacrylamide yielded narrowly dispersed polymers with consistent high yields (similar to 80%). Lower yields (similar to 50%) were observed when narrowly dispersed random copolymers of N-isopropylacrylamide and acrylamide where synthesized. Amino-terminated poly(N-isopropylacrylamide) and poly(N-isopropylacrylamide-co- acrylamide) were successfully used as macroinitiators for ROP of N-6-carbobenzoxy-L-lysine N-carboxyanhydride. The thermal behavior of the homopolymers and copolymers in aqueous solutions was studied by turbidimetry, dynamic light scattering (DLS) and proton nuclear magnetic resonance spectroscopy (H-1-NMR).
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