Crystal structure effect in radiation induced solid state polymerization of methacrylamide

Usanmaz, Ali
Kafadar, AB
Radiation induced solid state polymerization of methacrylamide was carried out, opened to atmosphere and under vacuum conditions at room temperature. The white colored powder polymers obtained were insoluble in most common organic solvents such as carbon tetrachloride, dimethysulfoxide, acetone, etc. The polymers were characterized by IR, direct pyrolysis mass spectrometer (DP-MS), XRD, TGA, and DSC methods. The mechanism of the polymerization was elucidated from these results. There were no definite effects of oxygen on the polymerization mechanism. The limiting diffusion of oxygen into the material is due to the close packing of monomer molecules. Polymerization proceeds on the monomerpolymer interface by the opening of the vinyl bond. The polymer obtained was amorphous and did not give a melting peak in DSC thermogram. From the experimental data, it was shown that the polymer gave a side group cyclization upon thermal treatment.


CEVIK, NN; Usanmaz, Ali (Informa UK Limited, 1993-01-01)
4-Vinyl-1-cyclohexene was polymerized by radiation at room temperature under vacuum and in atmospheric air. The change of percent conversion with irradiation time is almost linear up to limiting conversion, but it is S-type in atmospheric air. It was shown that the mechanism of polymerization is most probably ionic rather than free-radical. The cationic polymerization was carried out in dichloromethane solution at -8-degrees-C using BF3(C2H5)2O as catalyst. The nature of the polymer obtained was investigate...
Topotactic solid-state polymerization of acenaphtylene by radiation
Usanmaz, Ali; Baytar, N (Informa UK Limited, 1998-01-01)
The radiation-induced solid-state polymerization of acenaphthylene was carried out under vacuum at room temperature. The monomer and obtained polymer samples were investigated by UV, FTIR, DSC, TG, and powder X-ray diffraction methods to characterize the polymer and elucidate the polymerization mechanism. The polymer samples were crystalline with melting points ranging in 380-390 degrees C interval. Polymerization takes place through vinyl groups by a radical mechanism and crystal structure of monomer and p...
Topotactic solid-state polymerization of 3-aminocrotonamide by radiation
Usanmaz, Ali; Melad, OK (Wiley, 1996-04-30)
Radiation-induced solid-state polymerization of 3-aminocrotonamide (3-amino-2-butenamide) was carried out at room temperature, in open air atmosphere and under vacuum condition. The polymer obtained was white powder, soluble in methanol, but insoluble in water. The nature of polymers were investigated by IR, UV, x-ray, DP-MS, and elemental analysis to elucidate the mechanism of the polymerization. The polymer was crystalline with melting point in the range of 245-255 degrees C. The cell parameters and space...
Usanmaz, Ali; KIZILIRMAK, N (Informa UK Limited, 1992-01-01)
Solid-state polymerization of 1-ethynyl-1-cyclohexanol was carried out by irradiation in vacuum and in open air at 20-degrees-C. Radiation-induced polymerization was also done in a benzene solution. The products were mixtures of oligomers and polymers. IR, NMR, UV, and x-ray investigations showed the initial formation of trimer, oligomer, and polymer. The polymer fraction increased with an increase of conversion. Electroinitiated polymerization gave soluble and insoluble fractions. The soluble fraction was ...
Solid State Polymerization of N-vinylcaprolactam via Gamma Irradiation and Characterization
Usanmaz, Ali; Ozdemir, Tonguc; Polat, Özlem (Informa UK Limited, 2009-01-01)
In this study, N-vinylcaprolactam was polymerized via gamma irradiation in the solid state. The polymerization was carried out at room temperature both under vacuum and open to atmosphere. The polymerization mechanism showed auto acceleration and the rate of polymerization was higher in the presence of oxygen. Complete conversion was obtained under vacuum conditions and 90% conversion was obtained in the case of polymerization open to atmosphere. The polymers were characterized by FTIR, NMR, DSC, TGA, GPC, ...
Citation Formats
A. Usanmaz and A. Kafadar, “Crystal structure effect in radiation induced solid state polymerization of methacrylamide,” JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY, pp. 387–399, 2004, Accessed: 00, 2020. [Online]. Available: