NDLI: How controlled and versatile is N-carboxy anhydride (NCA) polymerization at 0 °C? Effect of temperature on homo-, block- and graft (co)polymerization

Content Provider	Royal Society of Chemistry (RSC)
Author	Peeters, Maloes Heise, Andreas Dietz, Carin H. J. T. Habraken, Gijs J. M. Koning, Cor E.
Copyright Year	2010
Abstract	We have investigated the polymerization of various amino acid N-carboxyanhydrides (NCAs) at 0 °C. Detailed MALDI-ToF analysis of homopolymerizations of three amino acid NCAs clearly confirms that frequently occurring end-group termination and other side-reactions are absent at 0 °C. The polymerization is thus controlled and homo and copolypeptides with low polydispersities, around 1.1, were obtained for soluble polypeptides. MALDI-ToF contour plot analysis confirmed the randomness of the copolymers. The controlled character of the low temperature NCA polymerization was further verified by the successful block copolymer synthesis from polypeptide macroinitiators, which confirms the availability of the amino end-groups for chain extension. Moreover, graft copolymers were obtained by grafting of benzyl-L-glutamate NCA from lysine-containing copolymers. The formation of gels from the graft and corresponding block copolymers was investigated. While for the block copolymers interconnected polymer particles were observed by optical microscopy, the graft copolymers form an open cell structure.
Starting Page	514
Ending Page	524
Page Count	11
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	1
Issue Number	4
Journal	Polymer Chemistry
DOI	10.1039/b9py00337a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	End-group Carboxylic acid Ionization Optical microscope Polymerization Contour line Polymer Copolymer NCA Amino acid N-carboxyanhydride Peptide Grafting
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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