Abstract
The modification of unsaturated polyesters by poly(ethylene glycol) end groups was described in a recent work by us /1/. The modification was done in order to increase the toughness of the cured unsaturated polyester (UPE), and to lower the shrinkage during curing. This is normally done by physical methods, in which case elastomer particles (low profile additives) are added to the matrix. Chemical modification can also be used, examples are incorporation of long chain diols or unsaturated acids in the polyester chain. In our work the modification was done by an end-group reaction of a carboxyl-terminated unsaturated polyester with poly(ethylene glycol) mono methyl ethers of various molecular weights (range 350 to 2000 g/mol). Analysis revealed that diblock copolymers of the AB type was formed, and that the diblock copolymers had predominantly one poly(ethylene glycol) end group per polyester segment.
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