58634
2020
2020
eng
7677
7684
8
48
11
article
Royal Society of Chemistry
Cambridge
1
2020-11-11
2020-11-11
--
Aminolysis induced functionalization of (RAFT) polymer-dithioester with thiols and disulfides
A series of polystyrene- and poly(methyl methacrylate)-dithioesters was subjected to aminolysis under ambient atmospheric conditions, i.e., in the presence of oxygen. Polymer disulfide coupling by oxidation occurred within tens of minutes and the yield of disulfide-coupled polymer increased with decreasing polymer molar mass. Oxidation of thiolates is usually an unwanted side reaction, here it is employed to obtain exclusively polymeric mixed disulfides through in situ aminolysis/functionalization in the presence of a thiol. The in situ aminolysis/functionalization in the presence of a disulfide, Ellman's reagent or polymer disulfide, resulted in the exclusive formation of polymer-dithionitrobenzoic acid, which can be further reacted with a thiol to exchange the terminal functionality, or block copolymer with dynamic disulfide linker, respectively.
Polymer Chemistry
10.1039/d0py01365j
1759-9954
1759-9962
outputup:dataSource:WoS:2020
WOS:000601101500008
Schlaad, H (corresponding author), Univ Potsdam, Inst Chem, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany., schlaad@uni-potsdam.de
University of Potsdam
Schlaad, Helmut
2023-03-30T10:28:55+00:00
sword
importub
filename=package.tar
dcf06dcc3ef59316aeddb401b701be06
2528812-X
2623730-1
false
true
Andreas Hess
Bernhard Volkmar Konrad Jakob Schmidt
Helmut Schlaad
Chemie und zugeordnete Wissenschaften
Institut für Chemie
Referiert
Import
57417
2020
2020
eng
1364
1368
5
7
11
article
Royal Society of Chemistry
Cambridge
1
2020-01-02
2020-01-02
--
Epoxidized 1,4-polymyrcene
1,4-Polymyrcene was synthesized by anionic polymerization and epoxidized using meta-chloroperbenzoic acid. Samples with different degrees of epoxidation (25%, 49%, 74%, and 98%) were prepared and examined according to their chemical and thermal properties. Epoxidation was found to increase the glass transition temperature (T-g = 14 degrees C for the 98% epoxidized 1,4-polymyrcene) as well as the shelf live (>10 months). The trisubstituted epoxide groups were remarkably stable against nucleophiles under basic conditions but cross-linked or hydrolyzed in the presence of an acid. Also, highly epoxidized 1,4-polymyrcene readily cross-linked upon annealing at 260 degrees C to produce an epoxy resin.
Polymer chemistry
10.1039/c9py01783f
1759-9954
1759-9962
outputup:dataSource:WoS:2020
WOS:000517133800010
Schlaad, H (corresponding author), Univ Potsdam, Inst Chem, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany., schlaad@uni-potsdam.de
Zentrales Innovationsprogramm Mittelstand (ZIM) of the German Federal; Ministry for Economic Affairs and Energy (BMWi) [ZF4189301SL5]
Schlaad, Helmut
2023-01-10T10:58:28+00:00
sword
importub
filename=package.tar
c1e76bf370d3d2d3fea861b8136bbcf8
2528812-X
2623730-1
false
true
Aleksandar Matic
Andreas Hess
Dirk Schanzenbach
Helmut Schlaad
eng
uncontrolled
comb poly(beta-myrcene)-graft-poly(l-lactide) copolymers
eng
uncontrolled
thermoplastic elastomer synthesis
eng
uncontrolled
myrcen
eng
uncontrolled
polymerization
eng
uncontrolled
epoxidation
Chemie und zugeordnete Wissenschaften
Institut für Chemie
Referiert
Import
49736
2019
2019
eng
1636
1641
6
13
10
article
Royal Society of Chemistry
Cambridge
1
2019-02-13
2019-02-13
--
Polymerization of cystine-derived monomers
Cystine was used as a platform chemical to prepare cyclic and acyclic monomers for entropy-driven ringopening polymerization (ED-ROMP) via olefin or disulfide metathesis and for step-growth polymerization. The olefin ED-ROMP of an olefin/disulfide containing 16-atom macrocycle using the 3rd generation Grubbs catalyst was examined in greater detail. Kinetic studies revealed that the catalyst turned inactive during the polymerization, which limited the achievable (apparent) polymer molar mass to similar to 70 kg mol(-1). Such limitation could be overcome with the disulfide ED-ROMP of the same macrocycle to yield polymers with molar masses of up to 180 kg mol(-1). The step-growth polymerizations of acyclic diene and dithiol monomers via olefin metathesis or oxidation were far less effective and yielded just low molar mass polymers or oligomers; photopolymerization of a thiol-ene monomer produced a polyester with a molar mass of 35 kg mol(-1).
Polymer Chemistry
10.1039/c9py00118b
1759-9954
1759-9962
wos:2019
WOS:000462539300009
Schlaad, H (reprint author), Univ Potsdam, Inst Chem, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany., schlaad@uni-potsdam.de
University of Potsdam
2021-03-04T12:32:15+00:00
sword
importub
filename=package.tar
7f122f04eabe94494bf70c14a9af71c1
Schlaad, Helmut
false
true
Felix Nicolas Behrendt
Andreas Hess
Max Lehmann
Bernd Schmidt
Helmut Schlaad
Chemie und zugeordnete Wissenschaften
Institut für Chemie
Referiert
Import
43646
2019
2019
eng
19271
19277
7
751
postprint
1
2019-10-11
2019-10-11
--
Temperature-triggered reversible breakdown of polymer-stabilized olive
A one-step moderate energy vibrational emulsification method was successfully employed to produce thermo-responsive olive/silicone-based Janus emulsions stabilized by poly(N,N-diethylacrylamide) carrying 0.7 mol% oleoyl side chains. Completely engulfed emulsion droplets remained stable at room temperature and could be destabilized on demand upon heating to the transition temperature of the polymeric stabilizer. Time-dependent light micrographs demonstrate the temperature-induced breakdown of the Janus droplets, which opens new aspects of application, for instance in biocatalysis.
Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe
silicone oil Janus emulsions
10.25932/publishup-43646
urn:nbn:de:kobv:517-opus4-436461
1866-8372
RSC Advances 9 (2019) 35, S. 19271–19277 DOI: 10.1039/c9ra03463c
<a href="http://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/43645">Bibliographieeintrag der Originalveröffentlichung/Quelle</a>
false
true
Rajarshi Roy Raju
Ferenc Liebig
Andreas Hess
Helmut Schlaad
Joachim Koetz
Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
751
eng
uncontrolled
microgels
eng
uncontrolled
step
Chemie und zugeordnete Wissenschaften
open_access
Institut für Chemie
Referiert
Open Access
Universität Potsdam
https://publishup.uni-potsdam.de/files/43646/pmnr751.pdf
43645
2019
2019
eng
19271
19277
7
35
9
article
RSC Publishing
London
1
2019-06-19
2019-06-19
--
Temperature-triggered reversible breakdown of polymer-stabilized olive
A one-step moderate energy vibrational emulsification method was successfully employed to produce thermo-responsive olive/silicone-based Janus emulsions stabilized by poly(N,N-diethylacrylamide) carrying 0.7 mol% oleoyl side chains. Completely engulfed emulsion droplets remained stable at room temperature and could be destabilized on demand upon heating to the transition temperature of the polymeric stabilizer. Time-dependent light micrographs demonstrate the temperature-induced breakdown of the Janus droplets, which opens new aspects of application, for instance in biocatalysis.
RSC Advances
silicone oil Janus emulsions
10.1039/c9ra03463c
2046-2069
Universität Potsdam
PA 2019_57
999.55
<a href="http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-436461">Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe ; 751</a>
false
false
Rajarshi Roy Raju
Ferenc Liebig
Andreas Hess
Helmut Schlaad
Joachim Koetz
eng
uncontrolled
microgels
eng
uncontrolled
step
Chemie und zugeordnete Wissenschaften
open_access
Institut für Chemie
Referiert
Publikationsfonds der Universität Potsdam
Open Access