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The influences of chain extension and blending temperature on the thermal properties of poly(L-lactide) (PLL) were investigated. Joncryl® ADR 4368, a styrene-acrylic multifunctional oligomeric agent, was used as a chain extender. Differential scanning calorimetry and thermogravimetry were used to determine the thermal transition properties and thermal stability of the chain extended PLL, respectively. The chain extension reaction occurred at a blending temperature of 190 °C better than at 170 °C. The molecular weights of the chain extended PLLs increased and melt flow indices decreased when the Joncryl® ADR 4368 ratio was increased. The addition of Joncryl® ADR 4368 had an effect on the glass transition temperature, crystallizing temperature and crystallinity of the PLL for the blending temperature of 190 °C. The chain extended PLLs with branched structures showed lower thermal stability than the linear PLLs. The content of branched PLLs increased with the Joncryl® ADR 4368 ratio and blending temperature. The chain extension reaction was complete when 2% Joncryl® ADR 4368 and a blending temperature of 190 °C were used. The results indicated that the chain extension improved the PLL’s melt strength and it has an effect on the thermal stability of the PLLs.

Effect of Chain Extension on Thermal Stability Behaviors of Polylactide Bioplastics