%0 Artikel
%@ 1022-1352
%A Kricheldorf, H.R.
%A  Lossow, C.v.
%A  Schwarz, G.
%A  Fritsch, D.

%D 2005
%J Macromolecular Chemistry and Physics
%N 1282
%P 1165 - 1170 
%R doi:10.1002/macp.200400509
%T Chain Extension and Cyclization of Telechelic Polysarcosines
%U http://dx.doi.org/10.1002/macp.200400509
 
%X 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.