Title
Preparation of dialdehyde chitosan/crosslinked amino starch and its effect on paper strength
Authors
MEIYAN WU WENZHI LV FENG WANG ZHU LONG JIE CHEN and CUIHUA DONG

Received March 9, 2016
Published Volume 52 Issue 1-2 January-February
Keywords dialdehyde chitosan, crosslinked amino starch, Schiff base, paper sheet, paper strength

Abstract
The dialdehyde chitosan/crosslinked amino starch (DCS/CAS) composite was prepared by the reaction of DCS and CAS. The structure of DCS/CAS and the effects of DCS/CAS on paper strength were investigated. It was demonstrated by FTIR and UV-Vis spectral analyses that DCS was partly grafted onto the main chain of CAS, leading to a Schiff base. The thermal property of DCS/CAS was analysed by TG and DSC, and the thermal decomposition temperature of 200 °C can meet the requirements of the papermaking industry. In addition, the strength of paper sheets can be greatly increased by adding the DCS/CAS composite to pulp, compared with adding DCS or CAS. Specifically, the tensile index and burst index of paper sheets can be increased by 31% and 35%, respectively, if the reaction occurs at a pH value of 6 and a temperature of 70 °C.