PHASE-SEPARATION OF POLYSULFIDE POLYMERS IN EPOXY ADHESIVES
UNSPECIFIED (1992) PHASE-SEPARATION OF POLYSULFIDE POLYMERS IN EPOXY ADHESIVES. In: 1991 ANNUAL CONF ON ADHESION AND ADHESIVES, CITY UNIV LONDON, LONDON, ENGLAND, MAR 26-27, 1991. Published in: INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES, 12 (3). pp. 171-177.Full text not available from this repository.
Modification of an epoxy system with a conventional polysulphide polymer, while resulting in increased adhesion to difficult-to-bond substrates and improved durability, flexibility and impact resistance, also leads to a reduction in the epoxy glass transition temperature (T(g)), thereby lowering the upper service temperature, and low peel strength, limiting the material's application. The reduction in T(g) is due to reaction of the flexible, rubbery polysulphide into the epoxy/amine system, decreasing the overall rigidity of the matrix. However, if the polysulphide can be made to phase separate then these limitations may potentially be overcome. In this work the type of epoxy resin was kept constant and the effect of modifying the polysulphide polymer (rubber molecular weight, degree of branching, rubber end-group and level of rubber used) was investigated for systems cured with liquid amine or dicyandiamide curative. The new systems are shown to exhibit only a small reduction in the epoxy Tg while having improved peel strength and maintaining the greater lap shear strength expected of a polysulphide-modified material.
|Item Type:||Conference Item (UNSPECIFIED)|
|Subjects:||T Technology > TP Chemical technology
T Technology > TA Engineering (General). Civil engineering (General)
|Journal or Publication Title:||INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES|
|Number of Pages:||7|
|Page Range:||pp. 171-177|
|Title of Event:||1991 ANNUAL CONF ON ADHESION AND ADHESIVES|
|Location of Event:||CITY UNIV LONDON, LONDON, ENGLAND|
|Date(s) of Event:||MAR 26-27, 1991|
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