Thermodynamic behavior of poly(cyclohexylethylene) in polyolefin diblock copolymers

Eric W. Cochran; Frank S. Bates

doi:10.1021/ma020227+

Thermodynamic behavior of poly(cyclohexylethylene) in polyolefin diblock copolymers

Eric W. Cochran, Frank S. Bates

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

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Abstract

We report the temperature dependence of the Flory-Huggins interaction parameter for three symmetric diblock copolymer systems containing poly(cyclohexylethylene) (PCHE): poly(cyclohexylethylene-b-ethylene) (CE), poly(cyclohexylethylene-b-ethylethylene) (CE_E), and poly(cyclohexylethylene-b-ethylenepropylene) (CP). Order-disorder transition temperatures (T_ODT) were determined using dynamic mechanical spectroscopy and interpreted with mean-field theory, (χN)_ODT = 10.5, leading to well-defined expressions for χ(T). These results have been analyzed in the context of solubility parameter (δ) theory resulting in a unique parameter δ_C that describes the interactions in CE, CP, and CE_E, where δ_C < δ_EE < δ_P < δ_E with (δ_E - δ_C) ≈ 1.6 MPa^1/2 at 500 K. In contrast to the predictions of group contribution theory, this indicates that δ_C is in surprisingly close proximity to the solubility parameter for poly(dimethylsiloxane).

Original language	English (US)
Pages (from-to)	7368-7374
Number of pages	7
Journal	Macromolecules
Volume	35
Issue number	19
DOIs	https://doi.org/10.1021/ma020227+
State	Published - Sep 10 2002

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title = "Thermodynamic behavior of poly(cyclohexylethylene) in polyolefin diblock copolymers",

abstract = "We report the temperature dependence of the Flory-Huggins interaction parameter for three symmetric diblock copolymer systems containing poly(cyclohexylethylene) (PCHE): poly(cyclohexylethylene-b-ethylene) (CE), poly(cyclohexylethylene-b-ethylethylene) (CEE), and poly(cyclohexylethylene-b-ethylenepropylene) (CP). Order-disorder transition temperatures (TODT) were determined using dynamic mechanical spectroscopy and interpreted with mean-field theory, (χN)ODT = 10.5, leading to well-defined expressions for χ(T). These results have been analyzed in the context of solubility parameter (δ) theory resulting in a unique parameter δC that describes the interactions in CE, CP, and CEE, where δC < δEE < δP < δE with (δE - δC) ≈ 1.6 MPa1/2 at 500 K. In contrast to the predictions of group contribution theory, this indicates that δC is in surprisingly close proximity to the solubility parameter for poly(dimethylsiloxane).",

author = "Cochran, {Eric W.} and Bates, {Frank S.}",

year = "2002",

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T1 - Thermodynamic behavior of poly(cyclohexylethylene) in polyolefin diblock copolymers

AU - Cochran, Eric W.

AU - Bates, Frank S.

PY - 2002/9/10

Y1 - 2002/9/10

N2 - We report the temperature dependence of the Flory-Huggins interaction parameter for three symmetric diblock copolymer systems containing poly(cyclohexylethylene) (PCHE): poly(cyclohexylethylene-b-ethylene) (CE), poly(cyclohexylethylene-b-ethylethylene) (CEE), and poly(cyclohexylethylene-b-ethylenepropylene) (CP). Order-disorder transition temperatures (TODT) were determined using dynamic mechanical spectroscopy and interpreted with mean-field theory, (χN)ODT = 10.5, leading to well-defined expressions for χ(T). These results have been analyzed in the context of solubility parameter (δ) theory resulting in a unique parameter δC that describes the interactions in CE, CP, and CEE, where δC < δEE < δP < δE with (δE - δC) ≈ 1.6 MPa1/2 at 500 K. In contrast to the predictions of group contribution theory, this indicates that δC is in surprisingly close proximity to the solubility parameter for poly(dimethylsiloxane).

AB - We report the temperature dependence of the Flory-Huggins interaction parameter for three symmetric diblock copolymer systems containing poly(cyclohexylethylene) (PCHE): poly(cyclohexylethylene-b-ethylene) (CE), poly(cyclohexylethylene-b-ethylethylene) (CEE), and poly(cyclohexylethylene-b-ethylenepropylene) (CP). Order-disorder transition temperatures (TODT) were determined using dynamic mechanical spectroscopy and interpreted with mean-field theory, (χN)ODT = 10.5, leading to well-defined expressions for χ(T). These results have been analyzed in the context of solubility parameter (δ) theory resulting in a unique parameter δC that describes the interactions in CE, CP, and CEE, where δC < δEE < δP < δE with (δE - δC) ≈ 1.6 MPa1/2 at 500 K. In contrast to the predictions of group contribution theory, this indicates that δC is in surprisingly close proximity to the solubility parameter for poly(dimethylsiloxane).

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Thermodynamic behavior of poly(cyclohexylethylene) in polyolefin diblock copolymers

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