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

doi:10.1021/mz4001892

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

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15 Scopus citations

Abstract

Rheological and small-angle X-ray scattering (SAXS) measurements were conducted on a symmetric, low molar mass (M_n = 17.6 kg/mol), poly(tert-butylstyrene-block-methyl methacrylate) (PtBS-PMMA) diblock copolymer near the order-disorder transition temperature (T_ODT = 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 language	English (US)
Pages (from-to)	496-500
Number of pages	5
Journal	ACS Macro Letters
Volume	2
Issue number	6
DOIs	https://doi.org/10.1021/mz4001892
State	Published - Jun 18 2013

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

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.",

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T1 - Rheological evidence of composition fluctuations in an unentangled diblock copolymer melt near the order-disorder transition

AU - Kennemur, Justin G.

AU - Hillmyer, Marc A.

AU - Bates, Frank S.

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Y1 - 2013/6/18

N2 - 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.

AB - 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.

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

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