Pengaruh jumlah nanofiller organoclay dan panjang rantai alkil surfaktan terhadap sifat mekanik bahan bionanokomposit poli (vinil alkohol) organoclay dan selulosa asetat organoclay = The Effect of organoclay nanofiller content and surfactant alkyl chain length to mechanical properties of poly vinyl alcohol organoclay and cellulose acetate organoclay