One-step sonochemical synthesis of a graphene oxide–manganese oxide nanocomposite for catalytic glycolysis of poly(ethylene terephthalate)

Nanoscale ◽  
2012 ◽  
Vol 4 (13) ◽  
pp. 3879 ◽  
Author(s):  
Gle Park ◽  
Leian Bartolome ◽  
Kyoung G. Lee ◽  
Seok Jae Lee ◽  
Do Hyun Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Manganese Oxide ◽  
Ethylene Terephthalate ◽  
Sonochemical Synthesis ◽  
Poly Ethylene Terephthalate ◽  
One Step ◽  
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.

scholarly journals Preparation and properties of porous carbon material containing magnesium oxide

2011 ◽  
Vol 13 (4) ◽  
pp. 42-46 ◽  
Author(s):  
Jacek Przepiórski ◽  
Adam Czyżewski ◽  
Joanna Kapica ◽  
Miguel de la Casa-Lillo
Keyword(s):  
Magnesium Oxide ◽  
Porous Carbon ◽  
Carbon Material ◽  
Ethylene Terephthalate ◽  
Porous Carbon Material ◽  
Preparation Process ◽  
Poly Ethylene Terephthalate ◽  
One Step ◽  
Textural Parameters ◽  
Poly Ethylene

Preparation and properties of porous carbon material containing magnesium oxide Porous carbons loaded with magnesium oxide were prepared through one-step process. Poly(ethylene terephthalate) and natural magnesite were used as carbon source and MgO precursor, respectively. An impact of a temperature and relative amounts of raw components used for preparations on the textural parameters of resulting hybrid materials is presented and discussed. As found, pore structure parameters tend to decrease along with MgO loading and temperature used during preparation process. Micropore area is the parameter being reduced primarily.

scholarly journals Oxygen Barrier Properties and Melt Crystallization Behavior of Poly(ethylene terephthalate)/Graphene Oxide Nanocomposites

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Anna Szymczyk ◽  
Sandra Paszkiewicz ◽  
Iwona Pawelec ◽  
Sławomir Lisiecki ◽  
Marek Jotko ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Ethylene Terephthalate ◽  
Oxygen Permeability ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Oxygen Barrier ◽  
Melt Crystallization ◽  
Nonisothermal Crystallization ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Poly(ethylene terephthalate) nanocomposites with low loading (0.1–0.5 wt%) of graphene oxide (GO) have been prepared by usingin situpolymerization method. TEM study of nanocomposites morphology has shown uniform distribution of highly exfoliated graphene oxide nanoplatelets in PET matrix. Investigations of oxygen permeability of amorphous films of nanocomposites showed that the nanocomposites had better oxygen barrier properties than the neat PET. The improvement of oxygen permeability for PET nanocomposite films over the neat PET is approximately factors of 2–3.3. DSC study on the nonisothermal crystallization behaviors proves that GO acts as a nucleating agent to accelerate the crystallization of PET matrix. The evolution of the lamellar nanostructure of nanocomposite and neat PET was monitored by SAXS during nonisothermal crystallization from the melt. It was found that unfilled PET and nanocomposite with the highest concentration of GO (0.5 wt%) showed almost similar values of the long period (L=11.4 nm for neat PET andL=11.5 nm for PET/0.5GO).

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