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6613307 
Journal Article 
PERMEATION OF WATER-VAPOR THROUGH SURFACE-LAYER RESINS 
Seycek, O; Scherz, N; , 
1995 
0 
Die Angewandte Makromolekulare Chemie
ISSN: 0003-3146 
HUTHIG & WEPF VERLAG 
BASEL 
47-58 
WOS:A1995TJ27100005 
Thin, plane plates of a defined thickness were cast from two types of gelcoat resins (isophthalic acid neopentylglycol CUP) and vinylester resin (PHA) based on bisphenol A) as a model for a gelcoat or topcoat layer of a glass fibre-reinforced laminate. The effect of undercuring as well as of resin dilution with styrene on the water vapor permeation through these plates was examined. In both cases the dilution of the resin results in an obvious increase of permeability. Undercuring (curing degrees of about 97%) and subsequent extraction of residual styrene monomer increases the water vapor permeability in the UP, on the other hand a light drop of the permeation coefficient was registered in the case of PHA. The results are discussed in connection with the different kinetics of the curing reactions in both resin types.