TY  - JOUR
A1  - Hellwig, Angelika
A1  - Volkmann, Lutz
T1  - Sufficient conditions for λ′-optimality in graphs of diameter 2
JF  - Discrete mathematics
Y1  - 2004
SN  - 1872-681X (E-Journal); 0012-365X (Print)
VL  - Vol. 283
IS  - Iss. 1-3
SP  - 113
EP  - 120
ER  - 
TY  - JOUR
A1  - Hellwig, Angelika
A1  - Volkmann, Lutz
T1  - Maximally edge-connected digraphs
JF  - Australasian journal of combinatorics
Y1  - 2003
SN  - 1034-4942 (E-Journal); 1034-4942 (Print)
VL  - Vol. 27
SP  - 23
EP  - 32
ER  - 
TY  - JOUR
A1  - Heinze, Daniel
A1  - Mang, Thomas
A1  - Peter, Karin
A1  - Möller, Martin
A1  - Weichold, Oliver
T1  - Synthesis of low molecular weight poly(vinyl acetate) and its application as plasticizer
JF  - Journal of applied polymer science
N2  - Poly(vinyl acetate), PVAc, with a degree of polymerization Xn = 10 was prepared by chain-transfer radical polymerization using carbon tetrachloride and used as oligomeric plasticizer for commercial PVAc. However, the chlorinated chain ends cause a low thermal stability requiring mild Cl/H substitution. The product exhibits high thermal stability and excellent melt-compounding properties. Blends of oligomeric and commercial PVAc show single glass transition temperatures which decrease with higher oligomer content and exhibit small negative deviations from Fox' linear additivity rule. This indicates plasticization and miscibility being mainly due to entropic effects. Injection-moulded thick specimens show ductile behaviour at oligomer contents >10 wt %, while sheets with a thickness of 0.2–0.5 mm appear flexible already at 7.5 wt %. The oxygen permeability coefficients are an order of magnitude lower than those of low-density polyethylene. Due to the sum of their properties, the plasticized sheets present a promising alternative in the preparation of barrier materials.
Y1  - 2014
U6  - https://doi.org/10.1002/app.40226
SN  - 1097-4628 (E-Journal); 0021-8995 (Print)
VL  - 131
IS  - 9
SP  - Article No. 40226
PB  - Wiley
CY  - New York
ER  - 
TY  - JOUR
A1  - Dankelmann, Peter
A1  - Hellwig, Angelika
A1  - Volkmann, Lutz
T1  - Inverse degree and edge-connectivity
JF  - Discrete mathematics
Y1  - 2009
SN  - 1872-681X (E-Journal); 0012-365X (Print)
VL  - Vol. 309
IS  - Iss. 9
SP  - 2943
EP  - 2947
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Hellwig, Angelika
A1  - Volkmann, Lutz
T1  - Maximally edge-connected and vertex-connected graphs and digraphs : a survey
JF  - Discrete mathematics
Y1  - 2008
SN  - 1872-681X (E-Journal); 0012-365X (Print)
VL  - Vol. 308
IS  - Iss. 15
SP  - 3265
EP  - 3296
ER  - 
TY  - JOUR
A1  - Hellwig, Angelika
A1  - Volkmann, Lutz
T1  - The connectivity of a graph and its complement
JF  - Discrete applied mathematics
Y1  - 2008
SN  - 0166-218X (E-Journal); 1872-6771 (E-Journal); 0166-218X (Print)
VL  - Vol. 156
IS  - Iss. 17
SP  - 3325
EP  - 3328
ER  - 
TY  - JOUR
A1  - Dankelmann, Peter
A1  - Hellwig, Angelika
A1  - Volkmann, Lutz
T1  - On the connectivity of diamond-free graphs
JF  - Discrete applied mathematics
Y1  - 2007
SN  - 0166-218X (E-Journal); 1872-6771 (E-Journal); 0166-218X (Print)
VL  - Vol. 155
IS  - Iss. 16
SP  - 2111
EP  - 2117
ER  - 
TY  - JOUR
A1  - Hellwig, Angelika
A1  - Volkmann, Lutz
T1  - Lower bounds on the vertex-connectivity of digraphs and graphs
JF  - Information processing letters
Y1  - 2006
SN  - 1872-6119 (E-Journal); 0020-0190 (Print)
VL  - Vol. 99
IS  - Iss. 2
SP  - 41
EP  - 46
ER  - 
TY  - JOUR
A1  - Hellwig, Angelika
A1  - Volkmann, Lutz
T1  - On connectivity in graphs with given clique number
JF  - Journal of graph theory
Y1  - 2006
SN  - 03649024 ; 10970118
VL  - Vol. 52
IS  - Iss. 1
SP  - 7
EP  - 14
ER  - 
TY  - JOUR
A1  - Hellwig, Angelika
A1  - Volkmann, Lutz
T1  - Some upper bounds for the domination number
JF  - The journal of combinatorial mathematics and combinatorial computing : JCMCC
Y1  - 2006
SN  - 0835-3026
VL  - Vol. 57
SP  - 187
EP  - 209
ER  -