Transport-morphology relationships in segmented polybutadiene polyurethanes: 1. Experimental results

Myrna Serrano; William J. MacKnight; Edwin L. Thomas; Julio M. Ottino

doi:10.1016/0032-3861(87)90009-7

Transport-morphology relationships in segmented polybutadiene polyurethanes: 1. Experimental results

Myrna Serrano^*, William J. MacKnight, Edwin L. Thomas, Julio M. Ottino

^*Corresponding author for this work

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Abstract

The microphase-separated morphology in a series of well characterized polybutadiene polyurethanes with hydroxy-terminated polybutadiene (HTPBD) endcapped with 2,4-toluene diisocyanate (TDI) as the soft segment (SS) phase, and the combination of 2,4-toluene diisocyanate and 1,4-butanediol (BDO) as the hard segment (HS) phase, has been investigated by transmission electron microscopy (TEM) and sorption studies using N₂, O₂ and CO₂. This system constitutes a model segmented polyurethane copolymer composed of amorphous rubbery and glassy domains. Evidence for the presence of phase separation is inferred from the scattering and phase contrast mechanisms of imaging. However, it is not possible to assign specific domain morphologies such as spherical, lamellar or cylindrical, based solely on the results of TEM. Complementary evidence of the domain presence is provided from the transport results; in particular, phase inversion and domain connectivity. Incomplete phase separation was indicated from the combined transport-morphology results for samples with less than 33 wt % hard segment.

Original language	English (US)
Pages (from-to)	1667-1673
Number of pages	7
Journal	Polymer
Volume	28
Issue number	10
DOIs	https://doi.org/10.1016/0032-3861(87)90009-7
State	Published - Sep 1987

Funding

This research was supported by the US Army Research Office, Durham (AROD) under grant DAAG-2982-K-0135.

Keywords

electron microscopy
morphology
phase separation
polybutadiene polyurethanes
transport

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/0032-3861(87)90009-7

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@article{e7b7f8eacfbc415a8e721b71fdbaf4a2,

title = "Transport-morphology relationships in segmented polybutadiene polyurethanes: 1. Experimental results",

abstract = "The microphase-separated morphology in a series of well characterized polybutadiene polyurethanes with hydroxy-terminated polybutadiene (HTPBD) endcapped with 2,4-toluene diisocyanate (TDI) as the soft segment (SS) phase, and the combination of 2,4-toluene diisocyanate and 1,4-butanediol (BDO) as the hard segment (HS) phase, has been investigated by transmission electron microscopy (TEM) and sorption studies using N2, O2 and CO2. This system constitutes a model segmented polyurethane copolymer composed of amorphous rubbery and glassy domains. Evidence for the presence of phase separation is inferred from the scattering and phase contrast mechanisms of imaging. However, it is not possible to assign specific domain morphologies such as spherical, lamellar or cylindrical, based solely on the results of TEM. Complementary evidence of the domain presence is provided from the transport results; in particular, phase inversion and domain connectivity. Incomplete phase separation was indicated from the combined transport-morphology results for samples with less than 33 wt % hard segment.",

keywords = "electron microscopy, morphology, phase separation, polybutadiene polyurethanes, transport",

author = "Myrna Serrano and MacKnight, {William J.} and Thomas, {Edwin L.} and Ottino, {Julio M.}",

note = "Funding Information: This research was supported by the US Army Research Office, Durham (AROD) under grant DAAG-2982-K-0135.",

year = "1987",

month = sep,

doi = "10.1016/0032-3861(87)90009-7",

language = "English (US)",

volume = "28",

pages = "1667--1673",

journal = "Polymer",

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TY - JOUR

T1 - Transport-morphology relationships in segmented polybutadiene polyurethanes

T2 - 1. Experimental results

AU - Serrano, Myrna

AU - MacKnight, William J.

AU - Thomas, Edwin L.

AU - Ottino, Julio M.

N1 - Funding Information: This research was supported by the US Army Research Office, Durham (AROD) under grant DAAG-2982-K-0135.

PY - 1987/9

Y1 - 1987/9

N2 - The microphase-separated morphology in a series of well characterized polybutadiene polyurethanes with hydroxy-terminated polybutadiene (HTPBD) endcapped with 2,4-toluene diisocyanate (TDI) as the soft segment (SS) phase, and the combination of 2,4-toluene diisocyanate and 1,4-butanediol (BDO) as the hard segment (HS) phase, has been investigated by transmission electron microscopy (TEM) and sorption studies using N2, O2 and CO2. This system constitutes a model segmented polyurethane copolymer composed of amorphous rubbery and glassy domains. Evidence for the presence of phase separation is inferred from the scattering and phase contrast mechanisms of imaging. However, it is not possible to assign specific domain morphologies such as spherical, lamellar or cylindrical, based solely on the results of TEM. Complementary evidence of the domain presence is provided from the transport results; in particular, phase inversion and domain connectivity. Incomplete phase separation was indicated from the combined transport-morphology results for samples with less than 33 wt % hard segment.

AB - The microphase-separated morphology in a series of well characterized polybutadiene polyurethanes with hydroxy-terminated polybutadiene (HTPBD) endcapped with 2,4-toluene diisocyanate (TDI) as the soft segment (SS) phase, and the combination of 2,4-toluene diisocyanate and 1,4-butanediol (BDO) as the hard segment (HS) phase, has been investigated by transmission electron microscopy (TEM) and sorption studies using N2, O2 and CO2. This system constitutes a model segmented polyurethane copolymer composed of amorphous rubbery and glassy domains. Evidence for the presence of phase separation is inferred from the scattering and phase contrast mechanisms of imaging. However, it is not possible to assign specific domain morphologies such as spherical, lamellar or cylindrical, based solely on the results of TEM. Complementary evidence of the domain presence is provided from the transport results; in particular, phase inversion and domain connectivity. Incomplete phase separation was indicated from the combined transport-morphology results for samples with less than 33 wt % hard segment.

KW - electron microscopy

KW - morphology

KW - phase separation

KW - polybutadiene polyurethanes

KW - transport

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ER -

Transport-morphology relationships in segmented polybutadiene polyurethanes: 1. Experimental results

Abstract

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Keywords

ASJC Scopus subject areas

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