Polymer Fractionation by Automated Laboratory System with Laser Optical Probe (L.A.F.P.)

Year 2022, Volume: 5 Issue: 2, 85 - 90, 30.11.2022

Mustafa Tolay Cemil Koyunoğlu , Patrizia Cinquina

Abstract

By examining the composition of copolymers and the distribution of their molecular weights, one can get an idea about their various properties. It is necessary to obtain homogeneous samples from fractions of different molecular weights of copolymers. Fractionation processes are quite difficult and time consuming. In this study, a type of ethylene-propylene copolymer was fractionated depending on molecular weight with a system based on laser turbidity measurement. The copolymer was dissolved in diphenylmethane at a certain temperature. The temperature of the system and the adjustment of other parameters are made with the developed computer-controlled system. When the temperature of the solution was lowered slowly and in a controlled manner, the separation of fractions with certain molecular weights could be achieved. The solution turbidity formed during the separation was measured and controlled by the developed laser system. Molecular weights, viscosities and IR analyses of the copolymer and its fractions were tried to find the properties of the fractions.

Keywords

Polymer fractionation, molecule distribution, laser probes, laboratory automation, batch chemical reactors

Thanks

We would like to thank Dott. Fabio Garbassi, Dott. Giangaleazzo Triulzi, Dott. Mariano Tacchi Venturi, Dott. Paolo Palagi, Ing. Paolo Bovio, Ing. Antonio Giuliani (Istituto Guido Donegani, Enichem, Novara, Italy) who helped us in this study, for their contribution.

References

• 1. Patterson G. Physical chemistry of macromolecules [Internet]. Boca Raton: CRC Press; 2007 [cited 2022 Jul 26]. Available from: http://www.crcnetbase.com/isbn/9781420014501
• 2. Misra GS. Introductory polymer chemistry. New York: J. Wiley & Sons; 1993. 253 p.
• 3. Collins EA, Bareš J, Billmeyer FW. Experiments in polymer science. New York: Wiley; 1973. 530 p.
• 4. Gouw TH. Guide to modern methods of instrumental analysis [Internet]. New York: Wiley-Interscience; 1972 [cited 2022 Jul 26]. Available from: http://books.google.com/books?id=1HhOAQAAIAAJ
• 5. Mendelson RA, Bowles WA, Finger FL. Effect of molecular structure on polyethylene melt rheology. I. Low-shear behavior. J Polym Sci A-2 Polym Phys. 1970 Jan;8(1):105–26.
• 6. Zimm BH, Kilb RW. Dynamics of branched polymer molecules in dilute solution. J Polym Sci. 1959 May;37(131):19–42.
• 7. Ram A, Miltz J. New method for MWD determination in branched polymers. J Appl Polym Sci. 1971 Nov;15(11):2639–44.
• 8. Schártl W, Schärtl W. Light scattering from polymer solutions and nanoparticle dispersions. Berlin: Springer; 2007. (Springer laboratory manuals in polymer science).
• 9. Tung LH. Block copolymer molecular weight by GPC. J Appl Polym Sci. 1979 Aug 15;24(4):953–63.
• 10. Scholte ThG, Meijerink NLJ, Schoffeleers HM, Brands AMG. Mark–Houwink equation and GPC calibration for linear short-chain branched polyolefines, including polypropylene and ethylene–propylene copolymers. J Appl Polym Sci. 1984 Dec;29(12):3763–82.
• 11. Flory PJ. Principles of polymer chemistry. 19. print. Ithaca, NY: Cornell Univ. Press; 2006. 672 p.
• 12. Tolay M, Cinquina P, Triulzi G. (L.A.P.F.)-Laboratorio Automatico per Il Frazionamento Polimeri. Novara, Italy: Istituto Guido Donegani, Gruppo Enichem; 1990 May.
• 13. Cinquina P, Triulzi G, Garbassi F. Procedure for the Continuous Fractionation of Polymers and Relative Equipment. Novara; 19778A/90.
• 14. Tolay M, Cinquina P, Triulzi G. Optical Probe to Determine the Turbidity of a Solution by Immersion. Novara; 911044370.1, 1991.
• 15. Tolay M, Cinquina P, Triulzi G. Optical Probe to Determine The Turbidity of a Solution of Polymers by Immersion (L. A. F. P.). In Istanbul, Turkey; 1996.
• 16. Desreux V, Bischoff J. Viscosimètres capillaires modifiés. Bull Soc Chim Belges. 2010 Sep 1;59(1–2):93–101.
• 17. Benoit H, Grubisic Z, Rempp P, Decker D, Zilliox JG. Étude par chromatographie en phase liquide de polystyrènes linéaires et ramifiés de structures connues. J Chim Phys. 1966;63:1507–14.