TY - GEN
T1 - Influence of domain spacing and molecular architecture on the deformation behaviour of polystyrene (PS) based thermoplastic elastomers
AU - Schlegel, R.
AU - Duan, Y.
AU - Hölzer, S.
AU - Weidisch, R.
AU - Mays, J. W.
AU - Avgeropoulos, A.
AU - Hadjichristidis, Nikolaos
PY - 2009/12/1
Y1 - 2009/12/1
N2 - Mechanical properties of four kinds of thermoplastic elastomers with similar PS content and different molecular architecture were investigated: trifunctional and tetrafunctional PS-g-polyisoprene (PI) multigraft copolymers, H-shaped PI-PS graft copolymers and LN4 16-68-16 with two PS outer blocks and a random polybutadiene (PB)-PS middle block. All of samples are phase separated and form alternate PS and rubbery lamellae. Multihysteresis measurements showed that with increasing complexity of the molecular architecture and decreasing domain spacing (from multigraft copolymers to H-shaped graft copolymers and LN4) the residual strain decreases obviously. For tri- and tetrafunctional multigraft copolymers, which have same domain spacing, increasing functionality were found to improve the elastomeric character of the investigated materials. In a conclusion, the domain spacing is the most dominant factor on the hysteresis properties and molecular architecture (difference of functionality) is the second one, within the studied range PS content has no obvious influence on the hysteresis properties.
AB - Mechanical properties of four kinds of thermoplastic elastomers with similar PS content and different molecular architecture were investigated: trifunctional and tetrafunctional PS-g-polyisoprene (PI) multigraft copolymers, H-shaped PI-PS graft copolymers and LN4 16-68-16 with two PS outer blocks and a random polybutadiene (PB)-PS middle block. All of samples are phase separated and form alternate PS and rubbery lamellae. Multihysteresis measurements showed that with increasing complexity of the molecular architecture and decreasing domain spacing (from multigraft copolymers to H-shaped graft copolymers and LN4) the residual strain decreases obviously. For tri- and tetrafunctional multigraft copolymers, which have same domain spacing, increasing functionality were found to improve the elastomeric character of the investigated materials. In a conclusion, the domain spacing is the most dominant factor on the hysteresis properties and molecular architecture (difference of functionality) is the second one, within the studied range PS content has no obvious influence on the hysteresis properties.
UR - http://www.scopus.com/inward/record.url?scp=84869853225&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84869853225
SN - 9781617382277
T3 - 12th International Conference on Fracture 2009, ICF-12
SP - 2624
EP - 2631
BT - 12th International Conference on Fracture 2009, ICF-12
T2 - 12th International Conference on Fracture 2009, ICF-12
Y2 - 12 July 2009 through 17 July 2009
ER -