Preparation of polyacrylonitrile with different molecular weights and high conversion yield in aqueous phase polymerization | ||||
| Egyptian Journal of Chemistry | ||||
| Volume 65, Issue 132, December 2022, Page 1347-1353 PDF (668.98 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2022.134810.5934 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Nivin Basiouny1; Hassan H. H. Hefni   2; Wael abouelmagd3; Nasser Abd El-Rahman4; eid esmail5; mona youssif6
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| 1assistance researcher, petrochemicals department Egyptian Petroleum Research Institute, | ||||
| 2Egyptian Petroleum Research Institute | ||||
| 3chemistry department, faculty of science, Ain Shams University, Cairo, Egypt, | ||||
| 4Petrochemicals department, Egyptian Petroleum research Institute | ||||
| 5petrochemicals department, Egyptian Petroleum Research Institute, Egypt | ||||
| 6petrochemicals department Egyptian Petroleum Research Institute, Egypt | ||||
| Abstract | ||||
| Different molecular weights of polyacrylonitrile (PAN) homopolymers were prepared based on the process of aqueous phase precipitation polymerization of acrylonitrile. Aqueous phase precipitation polymerization system includes water as aqueous media, acrylonitrile as monomer, ammonium persulfate as initiator, and drops of HCl as the activator of polymerization process. The polymerization processes were investigated at different monomer and initiator ratios, and different pH. The results showed that molecular weight of prepared polyacrylonitrile increased up to with increasing the monomer ratio at optimized pH 2.25, and the conversion percent was decreased. However, with increasing initiator ratios the opposite trend was occurred, i.e. the molecular weight decreased and conversion percent increased. The optimized conditions for getting suitable molecular weight at high conversion (84%) were at pH 2.25, 90 g/L of monomer concentration, and 0.67 g/L of APS initiator at time 6 hr. The prepared polymers were investigated using XRD, FTIR, H1NMR, TGA, and DSC. XRD results showed that crystallinity of the prepared polymers was decreased with increasing its molecular weight, as well as, the higher molecular weight of prepared PAN has more thermal stability than lower molecular weight. | ||||
| Keywords | ||||
| Polyacrylonitrile; aqueous phase precipitation polymerization; molecular weight; conversion yield | ||||
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