Preparation Of β-cyclodextrin Functionalized Polypropylene/Wood Cellulose And Its Adsorption And Release

The natural polymers modified can enlarge the scope of applications. In this paper, the cyclodextrin grafted with three polymer matrixs (polypropylene, wood and cellulose) were prepared as carriers with unique advantages. The carriers does not noly retain the unique nature of the cyclodextrin, but also had the characteristics of polymer materials. Therefore, the carriers could slow-release the loaded flavors or low molecular weight additives e.g. preservatives, which have a wide range in the field of environmental protection, food, packaging, medical and household chemicals.In this paper, polypropylene, wood flour and lignocellulose were usd as raw materials grafted with β-CD. By changing the experimental conditions such as reaction temperature, reaction time, reaction concentration e.g. to obtaine the optimal synthesize process. The results showed that the optimal synthetical condition was that the ratio of wood flour and CA-P-CD was1:9by weight, the reaction temperature was100℃, the reaction time was2.5h, with the β-cyclodextrin content of19.37μmol·g-1; The ratio of lignocellulose and CA-β-CD was1:8by weight, the reaction temperature was100℃, the reaction time was3h, with the P-cyclodextrin content of26.52μmol·g-1; The ratio of PP-glycidyl methacrylate (GMA) and β-CD was1:8by weight, the concentration of NaCl was1mol/L, the reaction temperature was70℃, the reaction time was2h, with the P-cyclodextrin content of29.37μmol·g-1.The carriers papered by cyclodextrin grafted polypropylene and lignocellulose were chosen to inclusing two sustained release molecules:eugenol and rose perfume. This paper also reserched that the adsorbed amount and the release rate of the two release agentthes with two different release molecules. The results showed that within20days after the PP-β-CD grafted eugenol and rose perfume, the eugenol loss rate of PP-β-cyclodextrin was12%and the rose perfume loss rate was24%. Under the same conditions, after20days, the eugenol loss rate of lignocellulose-β-cyclodextrin was9%and the rose perfume loss rate was33%. Therefore, β-cyclodextrin had achieved the purpose of the slow release the eugenol and rose perfume. The initial adsorption amounts of lignocellulose-β-cyclodextrin were less than PP-β-cyclodextrin. This is due to the β-cyclodextrin grafted amount of lignocellulose were less than PP, which affected the adsorption amount of eugenol and rose perfume.