Rheological evidence of composition fluctuations in an unentangled diblock copolymer melt near the order-disorder transition

Justin G. Kennemur, Marc A. Hillmyer, Frank S. Bates

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Rheological and small-angle X-ray scattering (SAXS) measurements were conducted on a symmetric, low molar mass (Mn = 17.6 kg/mol), poly(tert-butylstyrene-block-methyl methacrylate) (PtBS-PMMA) diblock copolymer near the order-disorder transition temperature (TODT = 193 ± 1 C). Evidence of composition fluctuations is apparent in the low frequency elastic (G′) and loss (G″) moduli and in the temperature dependence of the peak scattering intensity, I(q*), up to 50 C above the T ODT. These findings demonstrate that chain entanglements are not responsible for the well-documented fluctuation mode in the terminal viscoelastic regime of block copolymer melts.

Original languageEnglish (US)
Pages (from-to)496-500
Number of pages5
JournalACS Macro Letters
Volume2
Issue number6
DOIs
StatePublished - Jul 1 2013

Fingerprint Dive into the research topics of 'Rheological evidence of composition fluctuations in an unentangled diblock copolymer melt near the order-disorder transition'. Together they form a unique fingerprint.

Cite this