Chain extension and branching of poly(ethylene terephthalate) (PET) with di- and multifunctional epoxy or isocyanate additives: An experimental and modelling study

2012 ◽  
Vol 72 (1) ◽  
pp. 50-60 ◽  
Author(s):  
Patrizio Raffa ◽  
Maria-Beatrice Coltelli ◽  
Stefania Savi ◽  
Sabrina Bianchi ◽  
Valter Castelvetro
Keyword(s):  
Ethylene Terephthalate ◽  
Chain Extension ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Modelling Study

Effects of Chain Extension and Branching on the Properties of Poly (Ethylene-Terephthalate)-Organoclay Nanocomposites

2004 ◽  
Vol 856 ◽  
Author(s):  
Ali Emrah Keyfoglu ◽  
Ulku Yilmazer
Keyword(s):  
Ethylene Terephthalate ◽  
Interlayer Spacing ◽  
Chain Scission ◽  
Chain Extension ◽  
Twin Screw Extrusion ◽  
Poly Ethylene Terephthalate ◽  
Screw Extrusion ◽  
Organically Modified ◽  
Twin Screw ◽  
Poly Ethylene

ABSTRACTThe effects of chain extension and branching on the properties of nanocomposites produced from recycled poly (ethylene-terephthalate) and organically modified clay were investigated. As the potential chain extension/branching agent, maleic anhydride (MA) and pyromellitic dianhydride (PMDA) were used. The nanocomposites were prepared by twin-screw extrusion, followed by injection molding. Recycled poly (ethylene-terephthalate) was mixed with 2, 3 or 4 weight % of organically modified montmorillonite. During the second extrusion step, 0.5, 0.75 or 1 weight % of MA or PMDA was added to the products of the first extrusion. The effects of the sequence of addition of the ingredients on the final properties of the nanocomposites were also investigated. X-Ray Diffraction analysis showed that, the interlayer spacing of Cloisite 25A expanded from 19.21 Å to about 28–34 Å after processing with polymer indicating an intercalated structure. PMDA content, MA content and screw speed did not have a significant effect on the expanded interlayer distance. In the first extrusion step, nanocomposites containing 3% organoclay content gave significant increase in Young's modulus and decrease in elongation at break values indicating good interfacial adhesion. After the addition of anhydrides, it was observed that, in general PMDA improved the mechanical properties of the nanocomposite owing to the branching and chain extension effects that increase the molecular weight. However, MA did not significantly improve the properties, since in this case the chain scission seemed to be more dominant.

Fabrication of improved overall properties of poly (ethylene terephthalate) by simultaneous chain extension and crystallization promotion

2018 ◽  
Vol 133 (3) ◽  
pp. 1447-1454 ◽  
Author(s):  
Yiyang Liu ◽  
Alvianto Wirasaputra ◽  
Zhijie Jiang ◽  
Shumei Liu ◽  
Jianqing Zhao ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
Chain Extension ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Recycling of poly(ethylene terephthalate) by chain extension during reactive extrusion using functionalized block copolymers synthesized by RAFT polymerization

2018 ◽  
Vol 135 (42) ◽  
pp. 46771 ◽  
Author(s):  
Juan José Benvenuta-Tapia ◽  
Valeria Jordana González-Coronel ◽  
Guillermo Soriano-Moro ◽  
Isabel Martínez-De la Luz ◽  
Eduardo Vivaldo-Lima
Keyword(s):  
Block Copolymers ◽  
Ethylene Terephthalate ◽  
Raft Polymerization ◽  
Reactive Extrusion ◽  
Chain Extension ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene
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