Influence of chain extenders and chain end groups on properties of segmented polyurethanes. I. Phase morphology (EN)

Savelyev, YuV (EN)

Privalko, EG (EN)

Korskanov, VV (EN)

Kanapitsas, A (EN)

Privalko, VP (EN)

Grekov, AP (EN)

Pissis, P (EN)

Akhranovich, ER (EN)

Shtompel, VI (EN)

Segmented polyurethanes from oligotetramethylene glycol 1000, 4,4′-diphenylmethane diisocyanate and different chain extenders were characterized by specific heat capacity (temperature interval 130-450 K) and small-angle X-ray scattering measurements. A regular macrolattice of uniform-size micro-domains of stiff segments spanning a continuous matrix of soft segments was observed for the sample chain-extended with dihydrazide of isophthalipc acid, DIPA. The distribution of microdomains by sizes remained unchanged, whereas the overall degree of micropahase separation (DMS) increased due to dilution of DIPA and/or blocking of chain ends with crown ether-containing di- and monohydrazides. The distribution of microdomains by sizes broadened, whereas the DMS either remained unchanged or slightly decreased on dilution of DIPA with hydroxyl-containing chain extenders [1,4-di-N-oxy-2,3-bis-(oxymethyl)-quinoxaline and 1,4-butane-diol, respectively]. © 1998 Elsevier Science Ltd. All rights reserved. (EN)

journalArticle (EN)

Molecular structure (EN)

Specific heat of solids (EN)

Degree of microphase separation (EN)

Polymer Science (EN)

Composition effects (EN)

Polyurethanes (EN)

Isophthalipc acid (EN)

Oligotetramethylene glycol (EN)

Diphenylmethane diisocyanate (EN)

Phase separation (EN)

Chain ends (EN)

Glycols (EN)

X ray scattering (EN)

Chain extenders (EN)

National Technical University of Athens

Digital Library of National Technical University of Athens | Dspace@NTUA

Κεντρική Βιβλιοθήκη Ε.Μ.Π.

Ιδρυματικό Αποθετήριο

Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά

Polymer (EN)

English

1998 (EN)

http://hdl.handle.net/123456789/12738

0032-3861 (EN)

ISI:000073791900018 (EN)

3425 (EN)

15 (EN)

39 (EN)

10.1016/S0032-3861(97)10101-X (EN)

3429 (EN)

ELSEVIER SCI LTD (EN)