Study On The Preparation And Properties Of Modified By ATRP Grafting Method In Water Aqueous

Atom transfer radical polymerization (ATRP) is a new and efficient polymerization route, which could be used to prepare polymer with well controlled molecular weight and low polydispersity.Studies on modified silk by ATRP grafting method in aqueous were done as follows:1. Silk fibroin was reacted with 2-bromoisobutyryl bromide (BriB-Br) to obtain silk macroinitiator. The modified silk was prepared using dimethylaminoethyl methacrylate (DMAEMA) as monomer, CuBr/N, N, N', N", N" -pentamethyldiethylenetriamine (PMDETA) as catalyst system via atom transfer radical polymerization method in water aqueous. The effect of monomer concentration, dosage of catalyst and ligand, reacting temperature, time and pH value on the grafting was discussed. The advantage and disadvantages of grafted silk by traditional chemical grafting and ATRP grafting method were compared. The results showed that ATRP method has advantages of mild reaction condition and controlled molecular weight.2. The mechanical properties, whiteness, moisture regain and K/S value of the untreated and grafted silk were measured. The structure of grafted silk was analyzed by FI-IR, XRD and SEM. The results indicated that DMAEMA monomer was triumphantly grafted onto silk by ATRP method, and it has little effect on silk wearability.3. The anti-bacterial finish of ATRP grafted silk was studied, the quaternized silk has durable anti-bacterial effect.