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Solid-state n.m.r. investigation of crosslinkable blends of novolac and poly(∈-caprolactone)

journal contribution
posted on 1999-01-01, 00:00 authored by Z Zhong, Qipeng Guo, Y Mi
The miscibility, phase behavior, and intermolecular interaction of novolac/poly(∈-caprolactone) (PCL) blends, before and after curing, were investigated by the high resolution solid-state nuclear magnetic resonance (n.m.r.) technique. It was found that there exists hydrogen-bonding interaction between the carbonyl groups of PCL and the hydroxyl groups of novolac, which results in the downfield shift of carbonyl carbon resonance of PCL and the upfield shift of hydroxyl-substituted carbon resonance of novolac. The interaction also broadens the line width of carbonyl carbon resonance. After curing with 15 wt% hexamine (relative to novolac content), hydrogen-bonding interaction still exists between the components in the crosslinked blends. However, the relative amount of hydrogen bonds decreases significantly. Both the uncured and the cured novolac/PCL blends exhibit composition-dependent miscibility. The curing causes an increase of the domain size in the amorphous phase and a reaction of miscibility between the two components. © 1998 Elsevier Science Ltd. All rights reserved.

History

Journal

Polymer

Volume

40

Issue

1

Pagination

27 - 33

Publisher

Elsevier

Location

London, Eng.

ISSN

0032-3861

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1998, Elsevier Science