The Solid State Postcondensation of PET, 3

Summary: It was demonstrated that it is possible to produce prepolymers with a number‐average degree of polymerisation on the order of 5–40 directly in a liquid‐liquid dispersion in less than three hours. It was also shown that prepolymers made via this route and rapidly crystallised by the addition of a dispersant at ambient temperature are more porous than prepolymers made in an industrial liquid melt process. SEM micrograph of prepolymers pLL‐PTA with DP̄ ₙ = 28, dp ∈ 63–125 μm. magnified image SEM micrograph of prepolymers pLL‐PTA with DP̄ ₙ = 28, dp ∈ 63–125 μm.