scholarly journals Rheological properties of high melt strength poly(ethylene terephthalate) formed by reactive extrusion

2006 ◽  
Vol 100 (5) ◽  
pp. 3646-3652 ◽  
Author(s):  
J. S. Forsythe ◽  
K. Cheah ◽  
D. R. Nisbet ◽  
R. K. Gupta ◽  
A. Lau ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Ethylene Terephthalate ◽  
Reactive Extrusion ◽  
Melt Strength ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Molecular characterization and rheological properties of modified poly(ethylene terephthalate) obtained by reactive extrusion

2001 ◽  
Vol 41 (8) ◽  
pp. 1299-1309 ◽  
Author(s):  
Quoc Tuan Nguyen ◽  
Sonia Japon ◽  
André Luciani ◽  
Yves Leterrier ◽  
Jan-Anders E. Månson
Keyword(s):  
Rheological Properties ◽  
Molecular Characterization ◽  
Ethylene Terephthalate ◽  
Reactive Extrusion ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

scholarly journals Film Blowing of Linear and Long-Chain Branched Poly(ethylene terephthalate)

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1605 ◽  
Author(s):  
Michael Härth ◽  
Andrea Dörnhöfer
Keyword(s):  
Film Thickness ◽  
Ethylene Terephthalate ◽  
Reactive Extrusion ◽  
Chain Extender ◽  
Product Performance ◽  
Film Blowing ◽  
Melt Strength ◽  
Thickness Uniformity ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Film blowing of Poly(ethylene terephthalate) (PET) is challenging due its inherently low melt viscosity and poor melt strength. In this study, it is shown how the rheological properties of a commercial PET can be altered by reactive extrusion using either pyromellitic dianhydride (PMDA) or a multifunctional epoxy (Joncryl® ADR 4368) as chain extender, in order to improve the processing behavior during film blowing. The modified materials were characterized by shear and elongation rheometry and relevant processing characteristics, like melt pressure, bubble stability, and film thickness uniformity, were used to assess the influence of the type of modifier on processing and product performance. It is shown that PMDA is useful to increase the melt strength which leads to an improved bubble stability, while epoxy modified PET shows a reduced drawability that can cause problems at high take-up ratios. On the other hand, the epoxy modifier indicates a pronounced strain hardening during elongational deformation, and therefore leads to a better film thickness uniformity compared to the neat PET and the PET modified with PMDA. The differences with respect to processing performance are discussed and ascribed to the molecular structure of the materials.

Effect of coupling agent on crystallization and rheological properties of poly(ethylene terephthalate) composite masterbatches

2015 ◽  
Vol 38 (11) ◽  
pp. 2358-2367 ◽  
Author(s):  
Zhaohui Jiang ◽  
Zengge Guo ◽  
Congcong Pu ◽  
Zhao Jia ◽  
Changfa Xiao ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Coupling Agent ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

scholarly journals Study of nanoclay blends based on poly(ethylene terephthalate)/poly(ethylene naphthalene 2,6-dicarboxylate) prepared by reactive extrusion

2014 ◽  
Vol 34 (5) ◽  
pp. 431-439 ◽  
Author(s):  
Foued Zouai ◽  
Said Bouhelal ◽  
M. Esperanza Cagiao ◽  
Fatma Zohra Benabid ◽  
Djafer Benachour ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
Tensile Modulus ◽  
Reactive Extrusion ◽  
Organic Peroxide ◽  
Scanning Calorimetry ◽  
Tetramethylthiuram Disulfide ◽  
X Ray Scattering ◽  
Poly Ethylene Terephthalate ◽  
One Step ◽  
Poly Ethylene

Abstract The success of processing compatible blends, based on poly(ethylene terephthalate) (PET)/poly(ethylene naphthalene 2,6-dicarboxylate) (PEN)/clay nanocomposites in one step by reactive melt extrusion is described. Untreated clay was first purified and functionalized “in situ” with a compound based on an organic peroxide/sulfur mixture and (tetramethylthiuram disulfide) as the activator for sulfur. The PET and PEN materials were first separately mixed in the molten state with functionalized clay. The PET/4 wt% clay and PEN/7.5 wt% clay compositions showed total exfoliation. These compositions, denoted nPET and nPEN, respectively, were used to prepare new nPET/nPEN nanoblends in the same mixing batch. The nPET/nPEN nanoblends were compared to neat PET/PEN blends. The blends and nanocomposites were characterized using various techniques. Microstructural and nanostructural properties were investigated. Fourier transform infrared spectroscopy (FTIR) results showed that the exfoliation of tetrahedral clay nanolayers is complete and the octahedral structure totally disappears. It was shown that total exfoliation, confirmed by wide angle X-ray scattering (WAXS) measurements, contributes to the enhancement of impact strength and tensile modulus. In addition, WAXS results indicated that all samples are amorphous. The differential scanning calorimetry (DSC) study indicated the occurrence of one glass transition temperature Tg, one crystallization temperature Tc and one melting temperature Tm for every composition. This was evidence that both PET/PEN and nPET/nPEN blends are compatible in the entire range of compositions. In addition, the nPET/nPEN blends showed lower Tc and higher Tm values than the corresponding neat PET/PEN blends. In conclusion, the results obtained indicate that nPET/nPEN blends are different from the pure ones in nanostructure and physical behavior.

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