THE INFLUENCE OF HETEROGENEOUS CROSS-LINK DENSITY ON THE THERMOMECHANICAL AND HYGROTHERMAL PROPERTIES OF AN UNSATURATED POLYESTER RESIN .1.THERMOMECHANICAL RESPONSE
Pm. Jacobs et Fr. Jones, THE INFLUENCE OF HETEROGENEOUS CROSS-LINK DENSITY ON THE THERMOMECHANICAL AND HYGROTHERMAL PROPERTIES OF AN UNSATURATED POLYESTER RESIN .1.THERMOMECHANICAL RESPONSE, Polymer, 33(7), 1992, pp. 1418-1422
The crosslinking reactions that occur in unsaturated polyester resins
result in a heterogeneous structure of highly crosslinked domains sepa
rated by less highly crosslinked material. This structure is a result
of the formation of gel particles, which are initiated at free radical
s during the curing reaction. Controlling the concentration of free ra
dicals present in the system enables the heterogeneity within the resi
n to be varied, and its influence on the thermomechanical properties t
o be studied.