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Simple and efficient method for the synthesis of multiarm star-shaped graft copolymers of polycaprolactone (PCL) and hyperbranched polyester Boltorn H40 (BH40) is presented. Grafting of ε-caprolactone (CL) from BH40 proceeds without the addition of a catalyst, and without drying of CL. p-Toluenesulfonic acid, which is added as a catalyst during the synthesis of BH40, acts also as a catalyst for CL...
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