Structure and Properties of Nanocomposites With a Poly(Ethylene Terephthalate) Matrix

2006 ◽  
Author(s):  
U. Gurmendi ◽  
J. I. Eguiazabal ◽  
J. Nazabal
Keyword(s):  
Modulus Of Elasticity ◽  
Ethylene Terephthalate ◽  
Chemical Nature ◽  
Clay Content ◽  
High Dispersion ◽  
Organic Modification ◽  
Poly Ethylene Terephthalate ◽  
The Matrix ◽  
Twin Screw ◽  
Poly Ethylene

Polymer nanocomposites based on poly(ethylene terephthalate) PET and with an intercalated and fairly dispersed nanostructure have been obtained in the melt state using a twin screw extruder. The intercalation and dispersion levels as well as the mechanical properties were studied varying the chemical nature and amount of the organic modification of the clay as well as the clay content. The intercalation level of PET into the organoclay galleries was measured by the increase in the interlayer distance upon mixing. The surfactant content did not influence the intercalation level but an interaction between the polymeric matrix and the surfactant, through a common polar character led to easier intercalation. The observed modulus increases and consequently the overall dispersion did not almost depend on either the amount or chemical nature of the used organic modification of the clay, suggesting that the parameters leading to high intercalation differ from those lead to a high modulus of elasticity and therefore to a high dispersion level. The obtained increases in the modulus of elasticity that reflect the dispersion level were large attaining a 41% increase with respect to that of the matrix after a 6wt% clay addition.

Effects of Chain Extension and Branching on the Properties of Poly (Ethylene-Terephthalate)-Organoclay Nanocomposites

2004 ◽  
Vol 856 ◽  
Author(s):  
Ali Emrah Keyfoglu ◽  
Ulku Yilmazer
Keyword(s):  
Ethylene Terephthalate ◽  
Interlayer Spacing ◽  
Chain Scission ◽  
Chain Extension ◽  
Twin Screw Extrusion ◽  
Poly Ethylene Terephthalate ◽  
Screw Extrusion ◽  
Organically Modified ◽  
Twin Screw ◽  
Poly Ethylene

ABSTRACTThe effects of chain extension and branching on the properties of nanocomposites produced from recycled poly (ethylene-terephthalate) and organically modified clay were investigated. As the potential chain extension/branching agent, maleic anhydride (MA) and pyromellitic dianhydride (PMDA) were used. The nanocomposites were prepared by twin-screw extrusion, followed by injection molding. Recycled poly (ethylene-terephthalate) was mixed with 2, 3 or 4 weight % of organically modified montmorillonite. During the second extrusion step, 0.5, 0.75 or 1 weight % of MA or PMDA was added to the products of the first extrusion. The effects of the sequence of addition of the ingredients on the final properties of the nanocomposites were also investigated. X-Ray Diffraction analysis showed that, the interlayer spacing of Cloisite 25A expanded from 19.21 Å to about 28–34 Å after processing with polymer indicating an intercalated structure. PMDA content, MA content and screw speed did not have a significant effect on the expanded interlayer distance. In the first extrusion step, nanocomposites containing 3% organoclay content gave significant increase in Young's modulus and decrease in elongation at break values indicating good interfacial adhesion. After the addition of anhydrides, it was observed that, in general PMDA improved the mechanical properties of the nanocomposite owing to the branching and chain extension effects that increase the molecular weight. However, MA did not significantly improve the properties, since in this case the chain scission seemed to be more dominant.

Effects of Halloysite Nanotubes on Mechanical and Thermal Stability of Poly(Ethylene Terephthalate)/Polycarbonate Nanocomposites

2015 ◽  
Vol 735 ◽  
pp. 8-12
Author(s):  
Nurul Ain Jamaludin ◽  
Azman Hassan ◽  
Norhayani Othman ◽  
Mohammad Jawaid
Keyword(s):  
Thermal Stability ◽  
Ethylene Terephthalate ◽  
Flexural Modulus ◽  
Halloysite Nanotubes ◽  
Mechanical And Thermal Properties ◽  
Poly Ethylene Terephthalate ◽  
Twin Screw ◽  
Poly Ethylene ◽  
The Impact ◽  
Thermal Stability Of

The objective of this study is to investigate the effect of halloysite nanotubes (HNTs) loading on mechanical and thermal properties of poly(ethylene terephthalate)/polycarbonate (PET/PC) nanocomposites. Nanocomposites containing 70PET/30PC and 2-8 phr HNTs were prepared by twin screw extruder followed by injection moulding. As the percentage of HNTs increased, the flexural modulus increased. However, the flexural strength decreased with increasing HNTs content. The impact strength also decreased when HNTs increased. Thermogravimetry analysis of PET/PC/HNTs nanocomposites showed higher thermal stability at high HNTs content. However, on further addition of HNTs up to 8 phr, thermal stability of the nanocomposites decreased due to the poor dispersion of HNTs.

Preparation and Characterization of High-Density Polyethylene Blends and Recycled Poly(ethylene terephthalate)

2014 ◽  
Vol 695 ◽  
pp. 131-134 ◽  
Author(s):  
Mohd Nazry Salleh ◽  
Ruey Shan Chen ◽  
Mohd Hafizuddin Ab Ghani ◽  
Farizul Hafiz Kasim ◽  
Ahmad Sahrim
Keyword(s):  
High Density Polyethylene ◽  
Ethylene Terephthalate ◽  
Chemical Interaction ◽  
High Density ◽  
Impact Properties ◽  
Poly Ethylene Terephthalate ◽  
Twin Screw ◽  
Poly Ethylene ◽  
Methacrylate Copolymer ◽  
The Impact

Polymer blends based on recycled high density polyethylene (rHDPE) and recycled poly (ethylene terephthalate) (rPET) with two types of ethylene-glycidyl methacrylate copolymer (E-GMA), Lotader AX8840 and Lotader AX8900 as compatibilizer were produced in a co-rotating twin screw extruder. The effects of adding rPET content on the impact properties of rHDPE-rich blends were also investigated. The result showed an enhancement of about 80-270% in impact properties as compared to those of the Lotader AX8900. The impact strength also showed a decreasing trend as the rPET content was increased. The addition of E-GMA to the rHDPE/rPET blends was found to recover the blend toughness as well as improving the compatibility between HDPE and PET. In this study, the highest result was obtained for the rHDPE/rPET blends using Lotader AX8840 composition with 7.5% E-GMA content. FTIR analysis of the compatibilized blends confirmed the chemical interaction and improved interfacial bonding between the two phases.

Effects of extrusion conditions on the properties of recycled poly(ethylene terephthalate)/nanoclay nanocomposites prepared by a twin-screw extruder

2008 ◽  
Vol 108 (4) ◽  
pp. 2252-2259 ◽  
Author(s):  
A. L. F. de M. Giraldi ◽  
M. T. M. Bizarria ◽  
A. A. Silva ◽  
J. I. Velasco ◽  
Marcos A. d'Ávila ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Poly Ethylene Terephthalate ◽  
Twin Screw ◽  
Poly Ethylene

Study of braiding commingled self-reinforced PET composites

2018 ◽  
Vol 32 (19) ◽  
pp. 1840086
Author(s):  
C. M. Wu ◽  
W. Y. Hsieh ◽  
S. T. Su ◽  
K. B. Cheng ◽  
K. C. Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ethylene Terephthalate ◽  
Impact Behavior ◽  
Processing Conditions ◽  
Poly Ethylene Terephthalate ◽  
The Matrix ◽  
Poly Ethylene ◽  
Commingled Yarns

This work examines the flexural and impact behavior of self-reinforced poly(ethylene terephthalate) (srPET) composites, which were produced by film stacking from fabrics composed of braiding commingled yarns with high-tenacity PET (serving as the reinforcements) and copolymerized PET (mPET) (serving as the matrix). The influence of the hybrid yarns, fabric architectures, and processing conditions on the mechanical properties of srPETs were studied.

Investigation of Flame Retardant Properties of Poly(ethylene Terephthalate)/Silatrane Complex/Montmorillonite Nanocomposites

2013 ◽  
Vol 747 ◽  
pp. 43-46
Author(s):  
Phawittra Sonsilchai ◽  
Duangdao Aht-Ong
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Ethylene Terephthalate ◽  
Synergistic Effects ◽  
One Pot ◽  
Poly Ethylene Terephthalate ◽  
Twin Screw ◽  
Ft Ir ◽  
Flame Retardant Properties ◽  
Poly Ethylene

Poly (ethylene terephthalate) or PET was used in many applications such as packagings, textiles, electrical devices, and auto parts as well due to its good mechanical properties and dimensional stabilities, etc. However, the main drawback of PET is poor flame retardant and melt-dripping, which needed to be solved. Therefore, the aim of this research was to improve the flame retardant properties of PET by investigating the synergistic effects of flame retardant agents between silatrane complex and montmorillonite (MMT) at various concentrations. Silatrane complex was synthesized from silica through one pot process. The characteristic of the obtained silatrane complex was determined by FT-IR, SEM, and TGA. Various ratios of PET/silatrane complex/MMT nanocomposites were prepared by melt bending using a twin screw extruder and compressed into standard shape according to ASTM standard by a compression molding, respectively. Morphology, flame retardant properties, and mechanical properties of PET nanocomposites were investigated. The flame retardant properties were evaluated by LOI values and UL-94V rating. The results showed that mechanical properties of PET/silatrane complex/MMT nanocomposites were slightly different from those of the neat PET. The flame retardant properties showed that the LOI values of PET/silatrane complex/MMT nanocomposites were greater than that of neat PET and increased with increasing the silatrane complex concentration. The LOI value of PET/7%silatrane/2%MMT nanocomposite was increased up to 60.75%, compared with that of neat PET. While neat PET was classified into V-2 rating since it showed sustainable burning and melt-dripping behavior during burning process, PET/silatrane complex/MMT nanocomposites did not show such behavior and thus could be designated as V-0 rating. In addition, the results indicated that the MMT could occur synergistic effect with silatrane complex as well.

Morphology optimization of poly(ethylene terephthalate)/polyamide blends compatibilized via extension-dominated twin-screw extrusion

2021 ◽  
Vol 41 (3) ◽  
pp. 218-225
Author(s):  
Hao Chen ◽  
Molin Guo ◽  
David Schiraldi ◽  
João M. Maia
Keyword(s):  
Droplet Size ◽  
Ethylene Terephthalate ◽  
Aromatic Polyamide ◽  
Twin Screw Extrusion ◽  
Immiscible Polymers ◽  
Poly Ethylene Terephthalate ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Order Of Magnitude ◽  
Poly Ethylene

Abstract Poly(ethylene terephthalate) (PET) and polyamide (PA) are immiscible polymers, which requires the use of compatibilizers to stabilize the morphology and achieve acceptable property levels. Therefore, controlling the degree of dispersion, especially the size of the disperse PA droplets in the PET matrix is of paramount importance. This study aims to improve the mixing, i.e., minimize PA droplet size, in immiscible and compatibilized PET/PA and PET/Nylon-MXD6 (MXD6) blends by resorting to extension-dominated mixing in twin-screw extrusion (TSE). MXD6 is an aromatic polyamide similar in polarity to PET, so it is expected that it will blend more effectively than is the case with aliphatic nylon-6 and PET. Two screw configurations are used, a benchmark shear-dominated screw with kneading blocks (KBs) in an aggressive configuration, and an extension-dominated screw configuration with static mixers with hyperbolic C–D channels, recently developed by our group, in place of the KBs. The results show that the use of extensional mixing elements (EMEs) in place of KBs results in a significant decrease of both average and maximum droplet size for all blends, and up to more than one order of magnitude between the most extreme cases of the KB-processed immiscible blend and EME-processed compatibilized blends.

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