Effects of various properties of cellulose sheets on hydrophobization efficiency of gas grafting with palmitoyl chloride.

Cellulose sheets with different basis weight and beating degree were prepared, and gas grafting was performed under high temperature and high pressing pressure conditions. Then, the grafting efficiency expressed in the grafted fatty acid content and the like was analyzed. As a result, it was found that the grafted fatty acid content per square meter of cellulose sheet increased by 78.15 mg/m² as the sheet basis weight doubled from 100 g/m² to 200 g/m². This is due to more hydroxyl groups per equal area due to the higher basis weight. However, when the freeness of fibers reduced from 500 mL CSF to 300 mL CSF by beating, the grafted fatty acid content of the cellulose sheet per square meter decreased as low as 48.02 mg/m². This can be attributed to both the decrease in the accessible hydroxyl group content per equal area and the decrease in the porosity of the cellulose sheet. Both of these phenomena are caused by beating of fibers. [ABSTRACT FROM AUTHOR]