TY - JOUR
T1 - Synthesis and characterization of phosphonated Poly(ethylene terephthalate) ionomers
AU - Ju, Lin
AU - Pretelt, Juan
AU - Chen, Tianran
AU - Dennis, Joseph M.
AU - Heifferon, Katherine V.
AU - Baird, Donald G.
AU - Long, Timothy Edward
AU - Moore, Robert B.
PY - 2018/8/29
Y1 - 2018/8/29
N2 - A more efficient route for the synthesis of phosphonated dimethyl isophthalate, disodium salt is shown to provide a significantly higher yield (42%), in contrast to a previously reported yield (15%). This higher yield enabled the synthesis of phosphonated poly(ethylene terephthalate) (PPET) ionomers using conventional melt polycondensation with ethylene glycol and dimethyl terephthalate. The physical properties of these phosphonated PET ionomers (Na+-PPET) were characterized using differential scanning calorimetry (DSC), melt rheology, and tensile testing. DSC analysis showed that the crystalline melting temperatures, crystallization temperatures, degrees of crystallinity, and crystallization rates decreased with increasing ionic content. Melt rheology confirmed the existence of physical crosslinks in Na+-PPET ionomers, as indicated by a crossover of the storage and loss moduli, attributed to strong electrostatic associations between phosphonated units on the polymer chains. Tensile tests of the Na+-PPET samples showed enhanced Young's modulus and yield stress compared to pure PET.
AB - A more efficient route for the synthesis of phosphonated dimethyl isophthalate, disodium salt is shown to provide a significantly higher yield (42%), in contrast to a previously reported yield (15%). This higher yield enabled the synthesis of phosphonated poly(ethylene terephthalate) (PPET) ionomers using conventional melt polycondensation with ethylene glycol and dimethyl terephthalate. The physical properties of these phosphonated PET ionomers (Na+-PPET) were characterized using differential scanning calorimetry (DSC), melt rheology, and tensile testing. DSC analysis showed that the crystalline melting temperatures, crystallization temperatures, degrees of crystallinity, and crystallization rates decreased with increasing ionic content. Melt rheology confirmed the existence of physical crosslinks in Na+-PPET ionomers, as indicated by a crossover of the storage and loss moduli, attributed to strong electrostatic associations between phosphonated units on the polymer chains. Tensile tests of the Na+-PPET samples showed enhanced Young's modulus and yield stress compared to pure PET.
KW - Ionomer characterization
KW - Multivalent ionomer
KW - Phosphonated PET
KW - Polyester ionomer
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U2 - 10.1016/j.polymer.2018.07.065
DO - 10.1016/j.polymer.2018.07.065
M3 - Article
AN - SCOPUS:85053156248
SN - 0032-3861
VL - 151
SP - 154
EP - 163
JO - Polymer
JF - Polymer
ER -