Rheological Evidence of Composition Fluctuations in an Unentangled Diblock Copolymer Melt near the Order-Disorder Transition
- UMM
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 TODT. These findings demonstrate that chain entanglements are not responsible for the well-documented fluctuation mode in the terminal viscoelastic regime of block copolymer melts.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- INDUSTRY
- OSTI ID:
- 1095355
- Journal Information:
- ACS Macro Letters, Vol. 2, Issue (6) ; 06, 2013; ISSN 2161-1653
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- ENGLISH
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