بررسي اثر نوع شبكه ساز در پليمرشدن رسوبي آكريليك اسيد

Crosslinkers of Different Types in Precipitation Polymerization of Acrylic Acid

rosslinked poly(acrylic acid)s were prepared using two types of crosslink- ■ er by precipitation polymerization method in a binary organic solvent. ^^^^ N,Nʹ-methylenebisacrylamide (MBA) and polyethylene glycol dimethacry­late (PEGDMA-330) were used as low-molecular weight and long-chain crosslink­ers, respectively. The effect of various types of crosslinkers on polymer characteris­tics (i.e., gel content, equilibrium swelling, glass transition temperature, and rheo- logical properties) was investigated. Maximum amount of viscosity was obtained by using long-chain crosslinker. The Flory-Rehner equation and rubber elasticity theo­ry were used to discuss the network structure of polymer. It was observed that, the glass transition temperature (T ) of the synthesized polymer containing PEGDMA- 330 is higher than that of polymer containing MBA. Apparent and rotational viscos­ity were used to determine the optimal crosslinker type. In addition, the consistency coefficient (m) and flow behavior index (n) parameter of Ostwald equation were investigated as well.