Order-disorder transitions in cross-linked block copolymer solids

Hyeok Hahn, Arup K. Chakraborty, Jayajit Das, John A. Pople, Nitash P. Balsara

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The nature of order-disorder transitions in cross-linked diblock copolymer melts was studied using small-angle X-ray scattering (SAXS) and birefringence measurements. Experiments were conducted on cross-linked polystyrene-block- polyisoprene copolymer samples wherein the polyisoprene block was selectively cross-linked at a temperature well above the order-disorder transition temperature of the pure block copolymer. We find a reversible transition from a disordered gel to an ordered gel when the cross-linking density is below a critical value. The theological properties of disordered block copolymer gels are very different from that of cross-linked homopolymer gels.

Original languageEnglish
Pages (from-to)1277-1285
Number of pages9
Issue number4
StatePublished - 22 Feb 2005
Externally publishedYes


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