Abstract
Hydrotalcite inorganic fillers with different metal ratios were synthesized by coprecipitation method and hydrothermal method. The hydrotalcite inorganic fillers/polylactic acid composites (HT/PLA) were prepared by melt blending method. The mechanical properties, flame retardancy and thermal properties of the composites were investigated. The results show that HT inorganic filler was successfully prepared by coprecipitation method and it had typical HT structure. Compared with pure PLA, the impact strength and bending strength of HT/PLA composites decreased. The tensile strength, elongation at break, bending strength and tensile modulus of elasticity of the self-made M-Mg/Al-HT/PLA composite were better than those of the purchased C-Mg/Al-HT/PLA composite. The oxygen index of HT/PLA composites increased obviously, and the oxygen index of HT/PLA composites increased with the increase of the amount of HT. Different kinds of HT/PLA composites have different flame retardancy, and the order is Cu/Mg/Al-HT/PLA>Co/Mg/Al-HT/PLA>Ni/Mg/Al-HT/PLA>Mg/AlHT/PLA>Zn/Mg/Al-HT/PLA. The plasticity of HT/PLA composite is higher than that of pure PLA, and its thermal stability is better.
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