Hyperbranched polymers (HBP6) with polyethylene glycol (PEG) chains were synthesized via bulk
polymerization of diepoxide, primary amine, and monoepoxide. Polylactide (PLA) composites, with
aluminum trihydroxide (ATH) and HBP6, were prepared via direct melt compounding using a brabender.
The limiting oxygen index (LOI) could be raised to 44% for the PLA composite with 29 wt% ATH and 1%
HBP6. A UL-94 V-0 rating could be achieved by adding ATH and HBP6 to the PLA matrix. The HBP6 has a
lower glass transition temperature (Tg), approximately 31 C, and its incorporation as a plasticizer could
increase the impact strength of a PLA blend or composite. The elongation at break could be increased
from 5% for neat PLA to 83% for the PLA composite with an addition of 10% of HBP6 and 20% ATH. The
enhancement of impact strength of the composite was not only attributed to the decrease in Tg, but also
the dispersion of second-phase HBP6 domains formed by the phase separation.
Hyperbranched polymers (HBP6) with polyethylene glycol (PEG) chains were synthesized via bulkpolymerization of diepoxide, primary amine, and monoepoxide. Polylactide (PLA) composites, withaluminum trihydroxide (ATH) and HBP6, were prepared via direct melt compounding using a brabender.The limiting oxygen index (LOI) could be raised to 44% for the PLA composite with 29 wt% ATH and 1%HBP6. A UL-94 V-0 rating could be achieved by adding ATH and HBP6 to the PLA matrix. The HBP6 has alower glass transition temperature (Tg), approximately 31 C, and its incorporation as a plasticizer couldincrease the impact strength of a PLA blend or composite. The elongation at break could be increasedfrom 5% for neat PLA to 83% for the PLA composite with an addition of 10% of HBP6 and 20% ATH. Theenhancement of impact strength of the composite was not only attributed to the decrease in Tg, but alsothe dispersion of second-phase HBP6 domains formed by the phase separation.
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