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Solid-state polycondensation mechanisms

For the solubility of TPA in prepolymer, no data are available and the polymer-solvent interaction parameter X of the Flory-Huggins relationship is not accurately known. No experimental data are available for the vapour pressures of dimer or trimer. The published values for the diffusion coefficient of EG in solid and molten PET vary by orders of magnitude. For the diffusion of water, acetaldehyde and DEG in polymer, no reliable data are available. It is not even agreed upon if the mutual diffusion coefficients depend on the polymer molecular weight or on the melt viscosity, and if they are linear or exponential functions of temperature. Molecular modelling, accompanied by the rapid growth of computer performance, will hopefully help to solve this problem in the near future. The mass-transfer mechanisms for by-products in solid PET are not established, and the dependency of the solid-state polycondensation rate on crystallinity is still a matter of assumptions. [Pg.103]

Similar to virgin PET, solid-state polycondensation (SSP) is the method of choice to increase the molecular weight in mechanical recycling processes. [Pg.179]

Tang, Z., Goa, Q., Huang, N. and Sironi, C., Solid-state polycondensation of poly (ethylene terephthalate) kinetics and Mechanism, J. Appl. Polym. Sci., 57, 473-485 (1995). [Pg.188]

See other pages where Solid-state polycondensation mechanisms is mentioned: [Pg.161]    [Pg.161]    [Pg.240]    [Pg.478]    [Pg.239]    [Pg.478]    [Pg.30]    [Pg.61]    [Pg.84]    [Pg.84]    [Pg.295]    [Pg.145]    [Pg.520]    [Pg.424]    [Pg.398]    [Pg.947]    [Pg.898]    [Pg.352]    [Pg.256]    [Pg.358]    [Pg.78]    [Pg.287]    [Pg.380]    [Pg.455]    [Pg.457]    [Pg.6123]    [Pg.408]    [Pg.862]    [Pg.357]    [Pg.209]    [Pg.147]    [Pg.250]   
See also in sourсe #XX -- [ Pg.209 , Pg.209 ]

See also in sourсe #XX -- [ Pg.209 , Pg.209 ]



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Solid-state polycondensation

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