STUDY OF THE GRAFTING COPOLYMERIZATION MODIFICATION OF CAPROLACTAM ONTO HARDWOOD PULP FIBER: EFFECTS ON THE PHYSICAL PROPERTIES OF THE GRAFTED PULP
The effect of grafting on bleached hardwood pulp with caprolactam in an alkaline aqueous medium was studied, with potassium persulphate/sodium bisulfite as initiator system. Both the grafting ratio and the modified pulp properties of the grafting copolymerization process have been determined, the relevance between the modified effects and main technological parameters such as dosage of main chemicals (monomer, initiator, sodium hydroxide), reaction time and temperature, were discussed. The optimum modification technology condition was as follows: the monomer concentration was 0.44mol/L, the potassium persulfate concentration was 14.8mmol/L, the mass ratio of potassium persulfate to sodium bisulfite was 1.25, the reaction temperature was 50 , and the reaction time was 3 hours. The ℃ results showed that a higher grafting ratio of 28.2％ could be reached under the optimized modification conditions, and the physical strength performances of the modified pulp such as tensile index, bursting index and tearing index could be improved significantly with the optimum modification conditions. As a result, the brightness of pulp was reduced somewhat. The structure of copolymer was characterized by FT-IR. The fact verified that caprolactam had been grafted onto the hardwood pulp successfully.
hardwood pulp caprolactam grafting copolymerization grafting ratio physical properties
Wang Lijun Han Qing Xiu Huijuan
College of Pulping and Papermaking Engineering,Shaanxi University of Science & Technology, Xi’an,710021, China
国际会议
广州
英文
1670-1673
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）