Molecular structure and rheological properties of a poly(ethylene terephthalate) modified by two different chain extenders

2020 ◽  
Vol 138 (13) ◽  
pp. 50110
Author(s):  
Michael Härth ◽  
Andrea Dörnhöfer ◽  
Joachim Kaschta ◽  
Helmut Münstedt ◽  
Dirk W. Schubert
Keyword(s):  
Molecular Structure ◽  
Rheological Properties ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Terephthalate ◽  
Chain Extenders ◽  
Poly Ethylene

Calix[4]arenes Used as a New Type of Chain Extender in the Preparation of Polyurethanes

2007 ◽  
Vol 60 (3) ◽  
pp. 167 ◽  
Author(s):  
Qin Zheng ◽  
Shuling Gong ◽  
Haiqing Dong ◽  
Yuanyin Chen
Keyword(s):  
Ethylene Terephthalate ◽  
Toluene Diisocyanate ◽  
Elongation At Break ◽  
Poly Ethylene Terephthalate ◽  
Solvent Type ◽  
Lower Yield Strength ◽  
New Type ◽  
Chain Extenders ◽  
Poly Ethylene ◽  
Hydroxy Groups

A series of polyether– or polyester–polyurethanes based on tetrahydrofuran–propylene oxide copolyether diol (PTMG/PPG) or poly(ethylene terephthalate) diol (PET), toluene diisocyanate (TDI), and three kinds of chain extenders including two calix[4]arene derivatives and 3,3´-dichloro-4,4´-diaminodiphenylmethane (MOCA) were synthesized in toluene. The thermal stability and mechanical properties of solvent-type polyurethanes were investigated. Incorporation of calixarenes into polyurethane backbones improved the thermal properties of the polyurethane as a result of the residual phenol hydroxy groups of the calix[4]arene units. Compared with polyurethane chain-extended by MOCA, the polyurethanes with calix[4]arene derivatives had higher elongation at break, lower elastic modulus, and lower yield strength, as a result of the larger steric cubage of calix[4]arene units and relatively large free volume of the polymer.

Improving the properties of recycled PET/PEN blends by using different chain extenders

2016 ◽  
Vol 36 (6) ◽  
pp. 615-624 ◽  
Author(s):  
Simge Can ◽  
N. Gamze Karsli ◽  
Sertan Yesil ◽  
Ayse Aytac
Keyword(s):  
Ethylene Terephthalate ◽  
Chain Extender ◽  
Degree Of Crystallinity ◽  
Recycled Pet ◽  
H Nmr ◽  
Loading Level ◽  
Poly Ethylene Terephthalate ◽  
Chain Extenders ◽  
Izod Impact ◽  
Poly Ethylene

Abstract The main aim of this study was to improve the mechanical properties of the recycled poly(ethylene terephthalate)/poly(ethylene 2,6-naphthalate) (r-PET/PEN) blends by enhancing the miscibility between PET and PEN with the usage of chain extenders. This idea was novel for the recycled PET-based r-PET/PEN blends, as investigation of the effects of the chain extender usage on the properties of r-PET/PEN blends has not been studied in the literature, according to our knowledge. 1,4-Phenylene-bis-oxazoline (PBO), 1,4-phenylene-di-isocyanate (PDI), and triphenyl phosphite (TPP) were selected as chain extenders. The maximum tensile strength value was observed for the 1.0PDI sample. Moreover, PDI-based blends exhibited better Izod impact strength when compared with all other samples. The miscibility and degree of crystallinity values of all blends were discussed by means of thermal analysis. 1H-nuclear magnetic resonance (1H-NMR) analysis was carried out to determine transesterification reaction levels. According to 1H-NMR results, the increase in the level of transesterification was around 40% with the usage of PDI. The optimum loading level for selected chain extenders was determined as 1 wt.%, and PDI-based blends exhibited better properties when compared with those of the blends based on PBO and TPP at this loading level.

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 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

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
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