Open AccessEffect of modified calcium carbonate on the thermal and mechanical properties of biodegradable poly(L-lactic acid)
Author(s) -
YanHua Cai,
Yanhua Zhang,
Lisha Zhao
Publication year - 2015
Publication title -
polimery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 26
ISSN - 0032-2725
DOI - 10.14314/polimery.2015.095
Subject(s) - crystallization , calcium nitrate , calcium carbonate , materials science , ultimate tensile strength , elongation , lactic acid , chemical engineering , sodium carbonate , calcium , calcite , potassium carbonate , sodium , composite material , chemistry , mineralogy , organic chemistry , metallurgy , bacteria , biology , engineering , genetics
Modified calcite CaCO3 (M-CaCO3) was synthesized from calcium nitrate, sodium carbonate, ethylene diamine tetraacetic acid and sodium dodecyl sulfate. Then, poly(L-lactic acid) (PLLA)/ M-CaCO3 composites were fabricated using melt blending and hot-press forming technologies. The effect of M-CaCO3 on the thermal and mechanical performance of PLLA was investigated. The results showed that the crystallization temperature and M-CaCO3 content significantly affected the crystallization of PLLAbut the effect of M-CaCO3 on the crystallization of PLLAwas very complicated. Compared to neat PLLA, 1 %M-CaCO3 decreased the t1/2 from 3999.4 s to 342.7 s at 100 °C. Themelt index measurements indicated that a small amount ofM-CaCO3could block the fluidity of PLLA.However, the addition of a high contentM-CaCO3 increased the fluidity of PLLA. The results of tensile strengths and elongation at break of PLLA/M-CaCO3 composites showed that both M-CaCO3 content and defective modification CaCO3 affected the mechanical performance of the PLLA/M-CaCO3 composites.
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