where W0 is the initial dry weight of the composites and Wa is
the weight of the composites after exposure to water. Densities of
the PLA and its composites were measured in an electronic
densimeter Alfa Mirage model MD-300 S by weighing the mass of
the composites in water and air.
The reported results for mechanical testing were average values
of five measurements while those for water absorption, densities,
DMA,TGA, DSC, HDT, and molecular weightwere average values of
three measurements.