Block Copolymers near the Microphase Separation Transition. 1. Preparation and Physical Characterization of a Model System

Frank S. Bates; Harvey E. Bair; Mark A. Hartney

doi:10.1021/ma00140a019

Block Copolymers near the Microphase Separation Transition. 1. Preparation and Physical Characterization of a Model System

Frank S. Bates, Harvey E. Bair, Mark A. Hartney

Chemical Engineering and Materials Science

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Abstract

A model set of 1,4-polybutadiene-l,2-polybutadiene diblock copolymers has been prepared and molecularly characterized. Physical characterization by differential scanning calorimetry (DSC) and qualitative identification of the flow behavior (liquid-vs. solid-like) over a period of several days have established die critical degree of polymerization for this system as N_c = 1.20 (± 0.14) X 10³. Below the microphase separation transition the polymers exhibit a single broad glass transition, as measured by DSC, which has been attributed to local segment density fluctuations. This effect was found to be dependent on the degree of polymerization, as predicted from theory.

Original language	English (US)
Pages (from-to)	1987-1993
Number of pages	7
Journal	Macromolecules
Volume	17
Issue number	10
DOIs	https://doi.org/10.1021/ma00140a019
State	Published - Nov 1984

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abstract = "A model set of 1,4-polybutadiene-l,2-polybutadiene diblock copolymers has been prepared and molecularly characterized. Physical characterization by differential scanning calorimetry (DSC) and qualitative identification of the flow behavior (liquid-vs. solid-like) over a period of several days have established die critical degree of polymerization for this system as Nc = 1.20 (± 0.14) X 103. Below the microphase separation transition the polymers exhibit a single broad glass transition, as measured by DSC, which has been attributed to local segment density fluctuations. This effect was found to be dependent on the degree of polymerization, as predicted from theory.",

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AU - Bair, Harvey E.

AU - Hartney, Mark A.

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N2 - A model set of 1,4-polybutadiene-l,2-polybutadiene diblock copolymers has been prepared and molecularly characterized. Physical characterization by differential scanning calorimetry (DSC) and qualitative identification of the flow behavior (liquid-vs. solid-like) over a period of several days have established die critical degree of polymerization for this system as Nc = 1.20 (± 0.14) X 103. Below the microphase separation transition the polymers exhibit a single broad glass transition, as measured by DSC, which has been attributed to local segment density fluctuations. This effect was found to be dependent on the degree of polymerization, as predicted from theory.

AB - A model set of 1,4-polybutadiene-l,2-polybutadiene diblock copolymers has been prepared and molecularly characterized. Physical characterization by differential scanning calorimetry (DSC) and qualitative identification of the flow behavior (liquid-vs. solid-like) over a period of several days have established die critical degree of polymerization for this system as Nc = 1.20 (± 0.14) X 103. Below the microphase separation transition the polymers exhibit a single broad glass transition, as measured by DSC, which has been attributed to local segment density fluctuations. This effect was found to be dependent on the degree of polymerization, as predicted from theory.

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SP - 1987

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JO - Macromolecules

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Block Copolymers near the Microphase Separation Transition. 1. Preparation and Physical Characterization of a Model System

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