Characterizing Biaxially Stretched Polypropylene / Graphene Nanoplatelet Composites

In this work, polypropylene (PP) nanocomposites containing different weight concentration of graphene nanoplatelets (GNP) were prepared by melt-mixing using an industrial-scale, co-rotating, intermeshing, twin-screw extruder. The materials were then compression moulded into sheets, and biaxially stretched at different stretching ratios (SRs) below the PP melting temperature. The effects of GNP content and biaxial stretching on the bulk properties of unfilled PP and PP/GNP nanocomposites have been investigated in details. Results show that the addition of GNP (>5wt%) can lead to electrically conductive composites due to the formation of percolation network. The GNP have led to increased polymer crystallinity and enhanced materials stiffness and strength. Biaxial stretching process further enhances the materials mechanical properties but has slightly decreased the composites electrical conductivity. The PP/GNP nanocomposites were also processed into 3D demonstrator parts using vacuum forming, and the properties of which were comparable with biaxially stretched composites.

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Behaviour of PLA/POSS nanocomposites: Effects of filler content, functional group and copolymer compatibilization

Polymers and Polymer Composites ◽

10.1177/09673911211008020 ◽

2021 ◽

pp. 096739112110080

Author(s):

Yelda Meyva Zeybek ◽

Cevdet Kaynak

Keyword(s):

Functional Group ◽

Filler Content ◽

Mechanical And Thermal Properties ◽

Screw Extruder ◽

Melt Mixing ◽

Grafted Copolymer ◽

Before And After ◽

Twin Screw ◽

Oligomeric Silsesquioxane ◽

Matrix Nanocomposites

The main purpose of this study was to investigate influences of three parameters on the mechanical and thermal properties of the polylactide (PLA) matrix nanocomposites filled with polyhedral oligomeric silsesquioxane (POSS) particles. For the first parameter of “Filler Content”, nanocomposites with 1, 3, 5, 7 wt% basic POSS structure were compared. For the second parameter of “Functional Group,” basic POSS structure having only nonpolar isobutyl groups were compared with three other functionalized POSS structures; i.e. aminopropylisobutyl-POSS (ap-POSS), propanediolisobutyl-POSS (pd-POSS) and octasilane-POSS (os-POSS). Finally, for the third parameter of “Copolymer Compatibilization,” all specimens were compared before and after their maleic anhydride (MA) grafted copolymer compatibilization. Specimens were produced with twin-screw extruder melt mixing and shaped under compression molding. Various tests and analyses indicated that the optimum filler content for the improved mechanical properties was 1 wt%; while the optimum structure for strength and modulus was pd-POSS structure, in terms of fracture toughness it was basic POSS structure. Additional use of MA compatibilization was especially effective for the basic POSS and os-POSS particles.

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Performance of polylactide against UV irradiation: Synergism of an organic UV absorber with micron and nano-sized TiO2

Journal of Composite Materials ◽

10.1177/0021998319899140 ◽

2020 ◽

Vol 54 (18) ◽

pp. 2489-2504 ◽

Cited By ~ 1

Author(s):

Ulas Can ◽

Cevdet Kaynak

Keyword(s):

Weight Loss ◽

Thermal Properties ◽

Uv Irradiation ◽

Chemical Structure ◽

Mechanical And Thermal Properties ◽

Screw Extruder ◽

Melt Mixing ◽

Uv Absorber ◽

Fluorescent Lamps ◽

Twin Screw

The main purpose of this study was to investigate mechanical and thermal performance of polylactide specimens against UV irradiation; first when only adding benzotriazole benzotriazole-based organic UV absorber (UVA), micro (200 nm) and nano (50 nm) sized titania (TiO2) particles alone, and then to reveal possible synergism when they are added together. Compounds were prepared by twin-screw extruder melt mixing, while the 2 mm thick specimens were shaped by compression molding. Specimens were exposed to UV irradiation under fluorescent lamps (UVB-313) with 0.50 W/m2 for the periods of 12 and 24 days. Changes in the performance of UV irradiated specimens were evaluated in terms of % weight loss, changes in color and chemical structure, including the decreases in the mechanical and thermal properties. Various tests and analysis revealed that synergistic benefits of using micro and nano TiO2 particles together with benzotriazole-type UVA were not only due to the effective stiffening, strengthening and toughening actions of titania particles, but also due to their very significant “UV screening” actions absorbing the photons of the UV irradiation, thus decreasing the degree of the detrimental photodegradation reactions leading to chain scissions in their PLA matrix.

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Effect of Compatibilizer on Impact Strength and Morphology of Polystyrene/Zinc Oxide Nanocomposites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.545.330 ◽

2012 ◽

Vol 545 ◽

pp. 330-334

Author(s):

Sirirat Wacharawichanant ◽

Pranee Saetun ◽

Thunwawon Lekkong ◽

Thongyai Supakanok

Keyword(s):

Particle Size ◽

Zinc Oxide ◽

Impact Strength ◽

Impact Test ◽

Screw Extruder ◽

Melt Mixing ◽

Zno Particles ◽

Twin Screw ◽

The Impact ◽

Scanning Electron

This article investigated the effects of particle size of zinc oxide (ZnO) and polystyrene-co-maleic anhydride (SMA) compatibilizer on impact strength and morphology of polystyrene (PS)/ZnO71 (71 nm) and PS/ZnO250 (250 nm) nanocomposites. PS/ZnO nanocomposites with varying concentration of ZnO and SMA were prepared by a melt mixing technique in a twin screw extruder. It was found that the impact strength of PS nanocomposites increased up to a ZnO content of 1.0 wt%. Moreover, PS/ZnO250 nanocomposites had higher impact strength than PS/ZnO71 nanocomposites. The addition of SMA increased the impact strength of PS/ZnO nanocomposites with increasing SMA content. The result showed that SMA could improve impact strength of nanocomposites. The dispersion of ZnO particles on PS/ZnO nanocomposites was studied by scanning electron microscope (SEM). It was observed that the dispersion of ZnO particles of PS/ZnO nanocomposites without SMA was non-uniform and the agglomeration of ZnO particles in the polymer matrix increased with increasing ZnO content. The dispersion of ZnO particles of PS/ZnO nanocomposites after adding SMA was relatively good and only few aggregations exist. These observations support the results of the impact test where the PS/ZnO nanocomposites with SMA displayed higher impact strength than the PS/ZnO nanocomposites without SMA. The study showed that SMA was used as a compatibilizer to improve the dispersability and compatibility of ZnO particles in PS matrix.

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Effect of Compatibilizers on Mechanical Thermal and Morphology Properties of HDPE/TiO2 Nanocomposites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.93-94.169 ◽

2010 ◽

Vol 93-94 ◽

pp. 169-172

Author(s):

N. Wiriyanukul ◽

S. Wacharawichanant

Keyword(s):

Tensile Strength ◽

Electron Microscope ◽

High Density Polyethylene ◽

Morphological Properties ◽

Screw Extruder ◽

Melt Mixing ◽

Before And After ◽

Twin Screw ◽

Dispersion Of Nanoparticles ◽

Scanning Electron

This work studies the effect of PE-g-MA compatibilizer on mechanical thermal and morphological properties of high density polyethylene (HDPE)/titanium dioxide (TiO2) nanocomposites. The HDPE/TiO2 nanocomposites with and without PE-g-MA compatibilizer were prepared by melt mixing technique in a twin screw extruder. The results found that Young's Modulus of HDPE/TiO2 nanocomposites increased with increasing TiO2 contents. The addition of PE-g-MA compatibilizer had no significant effect on the tensile strength and stress at break of HDPE/TiO2 nanocomposites. The decomposition temperatures of HDPE/TiO2 nanocomposites before and after adding PE-g-MA compatibilizer increased with increasing TiO2 contents. The dispersion of TiO2 nanoparticles in HDPE matrix was observed by scanning electron microscope (SEM). The dispersion of nanoparticles in HDPE matrix with PE-g-MA compatibilizer was relatively good, only a few aggregates exited.

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Compatibilization Effect of Polyfunctional Monomers on PP/TPU Blends

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.322.394 ◽

2011 ◽

Vol 322 ◽

pp. 394-397 ◽

Cited By ~ 1

Author(s):

Lan Fang Guan ◽

Jin Zhou Chen

Keyword(s):

Mechanical Properties ◽

Twin Screw Extruder ◽

Screw Extruder ◽

Melt Mixing ◽

Polyfunctional Monomer ◽

Trimethylolpropane Triacrylate ◽

Twin Screw ◽

Compatibilization Effect

This paper mainly researched how polyfunctional monomers affect the Compatibilization of PP/TPU blends. With triallylisocyanurate (TAIC) and trimethylolpropane triacrylate (TMPTA) which belong to polyfunctional monomers as compatibilizers, various PP/TPU blends were prepared via melt mixing by using a twin-screw extruder. It is investigated that the effect of polyfunctional monomer on the mechanical properties, morphology and melt flowing behavior of the blends. The results show that the compatibility of PP/TPU is improved by adding moderate TAIC or TMPTA, and the compatibilization effect of TMPTA is superior to TAIC, especially when the content of monomers is 3 phr.

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Effect of γ-Radiation on the Property of Polypropylene/Nylon-6 Blends

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.320.69 ◽

2011 ◽

Vol 320 ◽

pp. 69-74

Author(s):

Jin Zhou Chen ◽

Qian Wang ◽

Ming Jun Niu ◽

Kai Guo ◽

Xin Fa Li ◽

...

Keyword(s):

Radiation Dose ◽

Nylon 6 ◽

Fixed Dose ◽

Screw Extruder ◽

Melt Mixing ◽

Γ Radiation ◽

Maleated Polypropylene ◽

Lower Radiation Dose ◽

Fixed Dose Rate ◽

Twin Screw

Blends PP/PA (100:18) was prepared by means of melt-mixing using a twin- screw extruder, and the effects of γ-radiation in air on their stability under lower radiation dose (≤5kGy) at a fixed dose rate of 110Gy/min have been researched. The effects of nylon-6 (PA-6), trimethyrol-propane trimethacrylate (TMPTA), maleated polypropylene (mPP) and γ-radiation dose (D) on melt flow ability, mechanical property, thermal property and morphology of the blends were investigated. It was noted that its tensile strength (σs) and Young’s modulus (E) increased with the addition of TMPTA, while its elongation (ε) and melt flowing rate (MFR) decreased. Compatibilizer mPP and TMPTA could improve the compatibility of the PP/PA-6. Its heat resistance was superior to PP. There was little effect of γ-radiation in air on their σs, E and ε when irradiation dose ranged from 0.1 to 5.0kGy.

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Mechanical Properties of PLA/LLDPE Films Reinforced with Silica from Rice Husk

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1025-1026.221 ◽

2014 ◽

Vol 1025-1026 ◽

pp. 221-226 ◽

Cited By ~ 5

Author(s):

Supavinee Sareeladdanon ◽

Pranut Potiyaraj

Keyword(s):

Mechanical Properties ◽

Rice Husk ◽

Tensile Testing ◽

Tensile Modulus ◽

Screw Extruder ◽

Melt Mixing ◽

Elongation At Break ◽

Rice Husk Silica ◽

Result Show ◽

Twin Screw

Nanocomposite is one of the most favorable approaches to improve mechanical properties of polymers. This study prepared polymer composite of PLA and LLDPE with different amount of rice husk silica (0.5 and 1 wt%). The composites were prepared by melt-mixing in a twin-screw extruder and processed into film by a chill roll cast extruder. The mechanical properties were investigated through tensile testing and tear testing. The result show that the tensile modulus of PLA decreased with 1wt% rice husk silica. Similarly, tensile modulus of LLDPE dropped with the addition of silica. However, with the addition 0.5 and 1 wt% rice husk silica, the elongation at break of PLA and LLDPE composites increases significantly.

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The Comprehensive Approach to Preparation and Investigation of the Eu3+ Doped Hydroxyapatite/poly(L-lactide) Nanocomposites: Promising Materials for Theranostics Application

Nanomaterials ◽

10.3390/nano9081146 ◽

2019 ◽

Vol 9 (8) ◽

pp. 1146 ◽

Cited By ~ 5

Author(s):

Katarzyna Szyszka ◽

Sara Targonska ◽

Malgorzata Gazinska ◽

Konrad Szustakiewicz ◽

Rafal J. Wiglusz

Keyword(s):

Emission Spectra ◽

Calcium Hydroxyapatite ◽

Spectroscopic Properties ◽

Precipitation Method ◽

Screw Extruder ◽

Scanning Calorimetry ◽

Melt Mixing ◽

Twin Screw ◽

The One ◽

Properties Of Composites

In response to the need for new materials for theranostics application, the structural and spectroscopic properties of composites designed for medical applications, received in the melt mixing process, were evaluated. A composite based on medical grade poly(L-lactide) (PLLA) and calcium hydroxyapatite (HAp) doped with Eu3+ ions was obtained by using a twin screw extruder. Pure calcium Hap, as well as the one doped with Eu3+ ions, was prepared using the precipitation method and then used as a filler. XRPD (X-ray Powder Diffraction) and IR (Infrared) spectroscopy were applied to investigate the structural properties of the obtained materials. DSC (Differential Scanning Calorimetry) was used to assess the Eu3+ ion content on phase transitions in PLLA. The tensile properties were also investigated. The excitation, emission spectra as well as decay time were measured to determine the spectroscopic properties. The simplified Judd–Ofelt (J-O) theory was applied and a detailed analysis in connection with the observed structural and spectroscopic measurements was made and described.

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