@article{kricheldorf_chain_extension_2005, 
author={Kricheldorf, H.R. and Lossow, C.v. and Schwarz, G. and Fritsch, D.},
title={Chain Extension and Cyclization of Telechelic Polysarcosines},
year={2005},
journal = {Macromolecular Chemistry and Physics},
volume = {206},
pages = {1165 - 1170},
doi = {http://dx.doi.org/10.1002/macp.200400509},
abstract = {Sarcosine N-carboxyanhydride (Sar-NCA) was
polymerized with 1,12-diaminododecane (DAD) or 1,13-
diamino-4,7,10-trioxatridecane (DATT) as initiators, and
telechelic blocks having two secondary amino endgroups
were obtained. Their structure was proven by 1H NMR and
MALDI-TOF mass spectrometry. The SEC measurements
indicated narrow molecular weight distribution with polydispersity
indices in the range of 1.1–1.2. These difunctional
polysarcosines were reacted with three different coupling
agents: 4,40-diisocyanatodiphenylmethane (MDI), N-hydroxysuccinimide
sebacate, and sebacoyl bisimidazolide. Although
the 1H NMR spectra proved high conversions, only a
moderate chain extension was observed. The MALDI-TOF
mass spectra indicated a high extent of cyclization, which
limited the chain growth.},
note = {Online available at: \url{http://dx.doi.org/10.1002/macp.200400509} (DOI). Kricheldorf, H.R.; Lossow, C.v.; Schwarz, G.; Fritsch, D.: Chain Extension and Cyclization of Telechelic Polysarcosines. In: Macromolecular Chemistry and Physics. Vol. 206 (2005) 1165 - 1170. (DOI:  10.1002/macp.200400509)}}