Abstract
A series of new crosslinkers, polyethylene glycol diacrylate 400(PEGDA), and polyethylene glycol dimethacrylate 300(PEGDMA) as long-chain crosslinkers, were utilized to prepare crosslinked poly (acrylic acid) microgels via precipitation polymerization in organic solvent. To investigate the effect of crossslinker type on structure and properties of the polymer, samples synthesized with long chain crosslinkers were compared with polymer synthesized with a short chain one [N,N′-Methylenebisacrylamide (MBA)]. Fourier transform infrared (FTIR)spectroscopy analysis was used for elucidating the structure of the samples and apparent viscosity was employed to determine optimum crosslinker concentration. The alcohol absorbency, gel content, and Tg were improved by utilizing PEGDA as the crosslinker. Rheological measurements of the water-swollen gels showed superior storage modulus with the long chain crosslinker. The Flory–Rehner equation and rubber elasticity theory were used for calculating and were separately discussed in terms of their effect on the structure-properties relationships of the microgels. In addition, the viscosity coefficient (m) and flow behavior index (n) of the Ostwald equation were studied. The microgels follow the close packed hard sphere model and also a power law behavior.
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