Article
Transport-morphology relationships in segmented polybutadiene polyurethanes: 1. Experimental results
Polymer
(1987)
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 , 0 2 and C02 • 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
- morphology,
- electron microscopy,
- polybutadiene polyurethanes,
- phase separation,
- transport
Disciplines
Publication Date
1987
Citation Information
William MacKnight, Myrna Serrano, E. L. Thomas and Julio M. Ottino. "Transport-morphology relationships in segmented polybutadiene polyurethanes: 1. Experimental results" Polymer Vol. 28 (1987) p. 1667 - 1673 Available at: http://works.bepress.com/william_macknight/250/