The Study On The Synthesis Of The Starch Grafted Polyamidine

The polyamidine being made by direct co-polymerization of N-vinyl formamide(NVF) and acrylonitrile(AN) was in low-molecule and high cost, so it's appling was restricted. Because starch with many hydroxy groups is abundant, it's easy to esterificatien and graft. In order to descend the cost and ascend the molecule, this paper was studied on polyamidine grafted with starch.Starch grafted polyamidine was made from starch grafting NVF and AN. In this paper, aqueous solution polymerization and the direct acetamiprid in acid medium were studied. (1)The optimized reaction conditions of intermediate were: the starch percent of 11.1%(wt); the initiator percent of 0.30%(wt); m(NVF):m(AN)=1:1; the polymerization temperature of 50℃; the polymerization time of 5h. (2)The optimized reaction conditions of acetamiprid were: the HCl percent of 11.1%(wt); the formamidine temperature of 95℃; formamidine time of 1.5h.The co-polymer and graft polyamidine were characterized by FT-IR. The properties of the graft polyamidine such as reduced viscosity and charge density were determined. It was found that the reduced viscosity of graft polyamidine was 1.94dL·g-1, it's charge density was 2.29mmol·g-1. The applied properties of the graft polyamidine such as the turbidity, COD and the percent of oil in the oil water seperation were determined. The results were satified that when grafted polyamidine for 25.0mg·L-1, the turbidity was 4.2; when grafted polyamidine for 50.0mg·L-1, the percent of oil in the oil water was 20.0mg·L-1.Additional, seed polymerization and other polymerization methods were also tried, which had yielded certain results. Furthermore, the influence of changes of concentrations of initiator, starch, monomer on graft efficiency and co-polymerization rate was studied during the co-polymerization reaction. Also the apparent activation energy was obtained.At present, this research is absolutely new. It's experement method and results are not recorded within national and international documents. But the formamidine is experemented in acid medium, so the decomposition of starch is serious. In order to solve this problem, the further research will be studied in future.