New Technology for Solid-state Polymerization of Polymers: Polyethylene terephthalate-Solid-state Polyaddition

Improving gas barrier of PET by blending with aromatic polyamides

“…Aromatic polyamides provide higher barrier than aliphatic polyamides, and unlike aliphatic polyamides, the aromatic polyamides retain high barrier under conditions of high humidity [9], making them more suitable for beverage packaging applications [10][11][12]. However, achieving the optimum barrier structure of PET/polyamide blends is compromised by incompatibility of the constituent polymers.…”

Recycled poly(ethylene terephthalate) chain extension by a reactive extrusion process

“…Recently, intensive drying to remove moisture, and vacuum degassing processing, were introduced by Erema in their plasticrecycling systems to minimize the effect of these reactions, resulting in higher PET [] in comparison with normal extruded PET (1). Solid state processing has also been reported to achieve higher PET [] (2,3). However, this process is considered to be slow and expensive.…”

Molecular structure influence on bending behavior of polyester filaments examined using a modified cantilever bending test

“…7 The loop test of Fukuda 8 or Zhou and Gosh 9 or the bending test of Matthewson, 1,10 with simple setups give relative values, which can only be referenced to the respective method and are based on the assumption of pure linear-elastic material behavior. 20,21,26 High molecular grades can be gained by solid-state polycondensation, which needs high reaction times (of several hours) and high costs in large-scale production [28][29][30][31][32] or by adding reactive bifunctional acid derivatives to the polymerization process accompanied by a decrease in reaction control. These include bending stiffness measurements via Laser Doppler vibrometry 11 or dynamic vibroscope measurements 12,13 based on resonance frequency methods, 14 as well as three-point bending via atomic force microscopy.…”

“…[23][24][25][26][27][28] The result is a low melt strength, limiting the use for several processes. 20,21,26 High molecular grades can be gained by solid-state polycondensation, which needs high reaction times (of several hours) and high costs in large-scale production [28][29][30][31][32] or by adding reactive bifunctional acid derivatives to the polymerization process accompanied by a decrease in reaction control. 19,33 To overcome this, the use of chain extenders, additives of low molar mass which are known to increase the molecular weight of polymers and broaden the molar mass distribution [20][21][22]34 is frequently reported.…”