ABSTRACT
To produce polymers with controlled solubility in epoxy resins, block copolymers (BCPs) of two types were synthesized: (a) A–B, B–A–B of the polymerization type produced by step-by-step ‘living’ polymerization of non-polar and polar monomers, butadiene and ε-caprolactone; (b) (AX)n–(BX)m of the polyaddition type produced from bifunctional non-polar hydroxyoligobutadienes, polar polyoxypropyleneglycols and diisocyanates. It has been shown that BCPs solubility depends on the ratio of polar to non-polar fractions in the macromolecule that ensures uniform composition of resulting products. This ratio can be controlled by dosing monomers (for BCPs of the first type) or by variation in blend composition and/or in MW of oligomers (for BCPs of the second type).
