Flax fibers were obtained from Tanta Flax and Oil Company,
Tanta, Egypt and cotton linters were obtained from El- Nile
Cotton Ginning Company, Minia, Egypt. Fig. 1A and B
show the two raw materials. Glacial acetic acid and acetic
anhydride were purchased from El-Nasr Pharmaceuticals
and Chemicals Company, Cairo, Egypt. Sulfuric acid was used
as a catalyst and for the acid resistance test; polyethylene
glycol 600 was used as a plasticizer; and acetone was used as
a solvent. Sodium hydroxide, lead acetate, ferrous sulfate
and tri- sodium orthophosphate were used for testing acids,
alkalis and salts to the produced CA’s resistance. They were
purchased from Sigma–Aldrich Corporation, USA.