Analysis of high melt‐strength poly(ethylene terephthalate) produced by reactive processing by shear and elongational rheology

Matthias Kruse; Peng Wang; Rajas Sudhir Shah; Manfred H. Wagner

doi:10.1002/pen.24936

journal article Nov 13, 2018

Analysis of high melt‐strength poly(ethylene terephthalate) produced by reactive processing by shear and elongational rheology

Matthias Kruse

Peng Wang

Rajas Sudhir Shah

Manfred H. Wagner

Polymer Engineering & Science Vol. 59 No. 2 pp. 396-410 · Wiley

View at Publisher Save 10.1002/pen.24936

Abstract

Three grades of poly(ethylene terephthalate) (PET) produced by different synthesis routes and with different molar masses were reactively extruded with two tetra‐functional chain extenders, i.e., pyromellitic dianhydride (PMDA) and tetraglycidyl diamino diphenyl methane (TGDDM). The preferred reactivity of the coupling agents led to different long‐chain branched (LCB) structures, which can be related to different hydroxyl and carboxyl end group concentrations of the PET grades investigated. The complex viscosity and the transient elongational viscosity increased by up to two decades. Both the activation energy of flow and the loss angle indicate long‐chain branching. A more quantitative assessment of the extent of strain hardening was achieved by application of the molecular stress function (MSF) model. The two material parameters of the model revealed different behaviors depending on the chain extender used. The initial molar mass of PET and the concentration of end groups, i.e., hydroxyl and carboxyl, determine the structure of the polymer molecules. PMDA proved to be an excellent coupling agent for industrial processing which induces reproducibly either a star‐like, comb‐like, or randomly branched structure depending on the concentration of coupling agent added and the hydroxyl concentration of the PET employed. TGDDM led to a hyperbranched structure. POLYM. ENG. SCI., 59:396–410, 2019. © 2018 Society of Plastics Engineers

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References

76

[1]

Xanthos M. (1992)

[2]

10.3139/217.2032

[3]

10.1002/pen.20588

[4]

10.1122/1.1413503

[5]

10.1122/1.1567752

[6]

10.1002/pen.11326

[7]

10.1002/pi.1526

[8]

Coccorullo I. Polymer (2009)

[9]

10.1016/s0032-3861(00)00032-x

[10]

10.1016/j.jmatprotec.2007.11.090

[11]

10.1002/pola.1995.080331017

[12]

10.1002/(sici)1099-0518(199605)34:7<1337::aid-pola22>3.0.co;2-9

[13]

10.1002/1097-4628(20000906)77:10<2206::aid-app14>3.0.co;2-d

[14]

10.1002/app.1985.070300815

[15]

10.1002/app.1986.070320423

[16]

10.1002/app.1987.070330838

[17]

10.1016/j.reactfunctpolym.2011.10.007

[18]

10.1016/j.polymdegradstab.2009.03.010

[19]

10.3139/9783446412811

[20]

Ferry J.D. (1980)

[21]

10.1016/s0377-0257(02)00080-0

[22]

S.Kheirandish “Constitutive Equations for Linear and Long‐Chain‐Branched Polymer Melts ” Ph.D. Thesis Berlin (2005).

[23]

10.1007/s003970000137

[24]

10.1007/s003970200010

[25]

10.1122/1.4853395

[26]

10.1122/1.549853

[27]

10.1122/1.549955

[28]

10.1007/s00397-005-0435-6

[29]

10.1122/1.2351880

[30]

10.1016/s0377-0257(98)00112-8

[31]

10.1122/1.1687786

[32]

Berkowitz S.A. Polymer (1984)

[33]

10.1007/s00397-016-0955-2

[34]

10.1007/978-0-387-69002-5_25

[35]

10.1002/pen.20155

[36]

10.1016/j.polymdegradstab.2015.06.001

[37]

10.1016/s0032-3861(99)00768-5

[38]

M.Kruse “From Linear to Long‐Chain Branched Polyethylene (Terephthalate) – Reactive Extrusion Rheology and Molecular Characterization ” Ph.D. Thesis Berlin (2016).

[39]

10.1007/s00397-004-0405-4

[40]

Krevelen D.W. (1976)

[41]

10.1122/1.550338

[42]

10.1122/1.550388

[43]

10.1039/f29787401802

[44]

10.1002/pol.1983.180210501

[45]

Doi M. (1986)

[46]

10.1007/s00397-014-0787-x

[47]

10.1122/1.549715

[48]

10.1007/s003970050010

[49]

Wagner M.H. Int. J. Appl. Mech. Eng. (2006)

[50]

10.1122/1.1562155

Showing 50 of 76 references

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Details

Published: Nov 13, 2018
Vol/Issue: 59(2)
Pages: 396-410
License: View

Authors

M

Matthias Kruse

Polymer Engineering/Polymer Physics Berlin Institute of Technology (TU Berlin) D‐10623 Berlin Germany

P

Peng Wang

Polymer Engineering/Polymer Physics Berlin Institute of Technology (TU Berlin) D‐10623 Berlin Germany

R

Rajas Sudhir Shah

Polymer Engineering/Polymer Physics Berlin Institute of Technology (TU Berlin) D‐10623 Berlin Germany

M

Manfred H. Wagner

Polymer Engineering/Polymer Physics Berlin Institute of Technology (TU Berlin) D‐10623 Berlin Germany

Funding

Deutsche Forschungsgemeinschaft

Cite This Article

Matthias Kruse, Peng Wang, Rajas Sudhir Shah, et al. (2018). Analysis of high melt‐strength poly(ethylene terephthalate) produced by reactive processing by shear and elongational rheology. Polymer Engineering & Science, 59(2), 396-410. https://doi.org/10.1002/pen.24936

Analysis of high melt‐strength poly(ethylene terephthalate) produced by reactive processing by shear and elongational rheology

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