scholarly journals Influence of expanded graphite (EG) and graphene oxide (GO) on physical properties of PET based nanocomposites

2014 ◽  
Vol 16 (4) ◽  
pp. 45-50 ◽  
Author(s):  
Sandra Paszkiewicz ◽  
Małgorzata Nachman ◽  
Anna Szymczyk ◽  
Zdeno Špitalský ◽  
Jaroslav Mosnáček ◽  
...  
Keyword(s):  
Physical Properties ◽  
In Situ Polymerization ◽  
Crystallization Rate ◽  
Expanded Graphite ◽  
Exfoliated Graphene ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Agglomeration Of Nanoparticles ◽  
Graphite Sheets

Abstract This work is the continuation and refinement of already published communications based on PET/EG nanocomposites prepared by in situ polymerization1, 2. In this study, nanocomposites based on poly(ethylene terephthalate) with expanded graphite were compared to those with functionalized graphite sheets (GO). The results suggest that the degree of dispersion of nanoparticles in the PET matrix has important effect on the structure and physical properties of the nanocomposites. The existence of graphene sheets nanoparticles enhances the crystallization rate of PET. It has been confirmed that in situ polymerization is the effective method for preparation nanocomposites which can avoid the agglomeration of nanoparticles in polymer matrices and improve the interfacial interaction between nanofiller and polymer matrix. The obtained results have shown also that due to the presence of functional groups on GO surface the interactions with PET matrix can be stronger than in the case of exfoliated graphene (EG) and matrix.

Effect of Zeolite as a Green Catalyst and Nucleation Agent on the Physical Properties of Poly(Ethylene 2,5-Furan-Dicarboxylate)

2018 ◽  
Vol 773 ◽  
pp. 88-93
Author(s):  
Je Young Park ◽  
Dong Yeop X. Oh ◽  
Tae Ho Kim ◽  
Sung Yeon Hwang
Keyword(s):  
In Situ Polymerization ◽  
Average Molecular Weight ◽  
Crystallization Rate ◽  
Melt Crystallization ◽  
Nucleation Agent ◽  
Weight Average Molecular Weight ◽  
Green Catalyst ◽  
Highest Weight ◽  
Poly Ethylene

In this study, poly(ethylene 2,5-furan dicarboxylate) (PEF) was synthesized from biomass-based dimethyl furan-2,5-dicarboxylate using different-sized zeolites, with substituted ions such as Li and K, as efficient green catalysts for in situ polymerization. The Z5Ali catalyst yielded the PEF biopolyester with the highest weight-average molecular weight among all the samples: 53,800 g/mol. From their TGA curves, it was confirmed that the PEF sample with ZA5Li as the catalyst showed an increased thermal stability compared to homo-PEF. Generally, homo-PEF exhibited a very low melt-crystallization rate with low enthalpy. However, all the PEF samples using zeolite as the catalyst formed endotherms I and II. This result was attributed to the fact that zeolite affects the melt and recrystallization of imperfect crystals due to physical hindrance.

scholarly journals The effect of attapulgite on crystallization behavior of Poly(ethylene terephthalate) (PET)/Attapulgite (AT) nano composites

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Fan Xufen ◽  
Chen Dajun
Keyword(s):  
Ethylene Terephthalate ◽  
In Situ Polymerization ◽  
Nucleating Agent ◽  
Avrami Equation ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

AbstractPoly (ethylene terephthalate) (PET)/Attapulgite (AT) nanocomposites were prepared via in-situ polymerization. According to the observation of transmission electron microscopy (TEM), attapulgite is well dispersed in the PET matrix in a nanometer scale. The influence of attapulgite content on the nonisothermal crystallization kinetics was studied using a classical Avrami equation with Jeziorny method. The crystalline structures of the pure PET and PET/AT nanocomposites with different amount of AT (0.2%, 0.5%, 1%, 2%) were characterized by differential scanning calorimetry (DSC) and X-ray diffraction (XRD) methods. It was found that the crystallization temperature for PET/AT nanocomposites with 0.2% and 0.5% content of AT were higher than pure PET and the rate of crystallization of all PET/AT nanocomposite samples increased significantly which indicated that attapulgite could be used as an effective nucleating agent in PET. However, with the addition of AT, smaller crystalline size, more crystalline defects and lower degree of crystallization was demonstrated.

scholarly journals In situ polymerization and characterization of graphite nanoplatelet/poly(ethylene terephthalate) nanocomposites for construction of melt-spun fibers

RSC Advances ◽  
2017 ◽  
Vol 7 (53) ◽  
pp. 33477-33485 ◽  
Author(s):  
Qiushu Xu ◽  
Chaosheng Wang ◽  
Biao Wang ◽  
Ye Chen ◽  
Huaping Wang
Keyword(s):  
Ethylene Terephthalate ◽  
In Situ Polymerization ◽  
Antistatic Property ◽  
Poly Ethylene Terephthalate ◽  
Melt Spun ◽  
Poly Ethylene ◽  
Spun Fibers

This work described a set of graphite nanoplatelet/poly(ethylene terephthalate) (GnP/PET) nanocomposites synthesized via an in situ polymerization for construction of melt-spun fibers with enhanced antistatic property.

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