Properties of paper sheets prepared from in-situ synthesis of cuprite in wood pulp fibers

摘要

Wood pulp-cuprite paper sheets were prepared from in-situ synthesis of copper(I)-oxide in wood pulp fibers,to study its effect on fire retardant porperty.Factors such as the amount of copper sulfate,amount of reducing carbohydrate,pH-value,temperature and the amount of carboxymethyl cellulose were studied to derive the optimumconditions for the formation of Cu(I) O with maintaining or improving the strength properties of the prepared paper sheets.The X-ray diffraction was used to identify the formation of Cu(I)O inside the fibers.The electricalproperties of the prepared paper sheets,e.g.,AC-conductivity (delta),dielectric constant (epsilon') and dielectric loss (epsilon") were also examined.The thermal degradation behaivour of some prepared paper sheets has been studied by means of non-isothermal thermogravimetric analysis,and the kinetic parameters were estimated by using Coats and Redfern equation.The results obtained show a good relation betweenthe amount of formed cuprite with the mechanical and electrical properties of the produced sheets.The formation of cuprite in wood pulp fibers improves the fire retardants property of the paper sheets;while the addition of CMC during cuprite formation diminishes this effect.