Abstract
A systematic study of solid state polymerization (SSP), concerning the melt extruded blend of poly(ethylene terephthalate)/polycarbonate (catalyzed PET/PC, 80/20 wt %), as a function of temperature range (180-190°C) for a fixed time (6 h) is presented. The materials obtained were evaluated by differential scanning calorimetry (DSC), thermogravimetry/derivative thermogravimetry (TG/DTG), optical microscopy (OM) and intrinsic viscosity (IV) analysis. After SSP, at all reaction temperatures, PET glass transition and heating crystallization temperatures slightly decreased, melting temperature slightly increased, while degree of crystallinity was practically invariable. The DTG curves indicated that, at least, three phases remained. The OM images revealed that the morphology is constituted of a PET matrix and a PC dispersed phase. In the interfacial region we noticed the appearance of structures like bridges linking the matrix and the dispersed domains. These bridges were correlated to the PET/PC block copolymer obtained during blending in the molten state. IV increased for all polymerization temperatures, due to the occurrence of PET chain extension reactions - esterification and transesterification. The IV range for bottle grade PET was achieved.
Highlights
Thermogravimetry/derivative thermogravimetry (TG/DTG), optical microscopy (OM) and intrinsic viscosity (IV) analysis
The results have shown there is a decrease in the molar mass of the blends due to the competition among chain degradative reactions – acidolysis and alcoholysis – and transesterification in the molten state
The first one was attributed to the Poly(ethylene terephthalate) (PET)/PC block copolymer generated during molten state processing
Summary
Solid state polymerization (SSP) is traditionally a reduce its molecular weight. Subsequent SSP indicated post-condensation technique in which polymer or its an enhancement of the rate of crystallization[2]. The effect prepolymer increases in molar mass through reactions of black activated carbon nanoparticles on solid state among terminal-reactive groups It can be considered polymerization of PET was investigated by Karayannidis an eco-friendly technique compared to interfacial and co-authors[3]. The action of titanium isopropoxide and antimony trioxide on SSP of PET and PEN oligomers the amorphous phase become mobile enough to allow reaction among polymer-terminal groups while the was studied by Sivaram and co-authors[5] They reported an increase of the crystallization rate but a reduction of segments in the crystalline phase have restricted mobility. C. et al - Solid state polymerization of PET/PC extruded blend: effect of reaction temperature on thermal, morphological and viscosity properties microstrucutre via 13C NMR sequence distribution was conducted on poly(butylene terephthalate) copolymers[9].
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