Role of molecular architecture in mechanical failure of glassy/semicrystalline block copolymers: CEC vs CECEC lamellae

T. J. Hermel, S. F. Hahn, K. A. Chaffin, W. W. Gerberich, F. S. Bates

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

The role of molecular architecture on the ultimate mechanical properties of nearly symmetric, lamellae-forming, CEC triblock and CECEC pentablock copolymers, where C and E denote poly(cyclohexylethylene) (PCHE) and poly(ethylene) (PE), respectively, was studied. Reciprocating shear was exploited to produce macroscopic sheets of aligned material with a "perpendicular" orientation. Subsequent stress-strain measurements, directed normal to the lamellae, revealed dramatic differences in toughness that correlate with architecture. Results demonstrate a dramatic crossover from brittle to ductile behavior when block connectivity is increased from n=2 to n=4, where n signifies the number of linearly coupled triblocks.

Original languageEnglish (US)
Pages (from-to)2190-2193
Number of pages4
JournalMacromolecules
Volume36
Issue number7
DOIs
StatePublished - Apr 8 2003

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