Preparation of Polypropylene Graft Maleic Anhydride (PP-g-MA) via Twin Screw Extrusion

2010 ◽  
Vol 93-94 ◽  
pp. 451-454 ◽  
Author(s):  
Rittirong Pruthtikul ◽  
Pitcha Liewchirakorn
Keyword(s):  
Maleic Anhydride ◽  
Polyamide 6 ◽  
Standard Test ◽  
Acid Number ◽  
Test Method ◽  
Reactive Blending ◽  
Twin Screw Extrusion ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Izod Impact

Polypropylene (PP) samples grafted with Maleic Anhydride (MA) were prepared by reactive blending via co-rotating twin screw extrusion. The PP was functionalized in the presence of an optimized amount of precursor, Dicumyl Peroxide (DCP) and MA. The amounts of MA grafted on PP were checked by standard test method for acid number. Maleated PP as a compatibilizer with the highest acid number was added to PP/Polyamide 6 (PA6) and blended in the twin screw extrusion. It was found that the PP-g-MA enhanced tensile properties as well as the izod impact properties of notched samples of PP/PA6/PP-g-MA blends compared to neat polypropylene. The scanning electron microscope confirmed the good adhesion of PA6 on PP matrix.

Self-Extinguishing and Non-Drip Flame Retardant Polyamide 6 Nanocomposite: Mechanical, Thermal, and Combustion Behavior

2018 ◽  
Vol 1 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Hao Wu ◽  
Rogelio Ortiz ◽  
Renan De Azevedo Correa ◽  
Mourad Krifa ◽  
Joseph H. Koo
Keyword(s):  
Maleic Anhydride ◽  
Flame Retardant ◽  
Polymer Matrix ◽  
Flame Retardants ◽  
Polyamide 6 ◽  
Twin Screw Extrusion ◽  
Elongation At Break ◽  
Combustion Behavior ◽  
Screw Extrusion ◽  
Twin Screw

AbstractIncorporation of flame-retardant (FR) additives and nanoclay fillers into thermoplastic polymers effectively suppresses materials flammability and melt dripping behavior. However, it largely affects other properties, such as toughness and ductility. In order to recover the lost toughness and ductility of flame retardant polyamide 6, various loadings of maleic anhydride modified SEBS elastomer were added and processed by twin screw extrusion. TEM images showed exfoliated nanoclay platelets and reveals that the clay platelets well dispersed in the polymer matrix. By balancing the ratio of flame retardants, nanoclay and elastomers, formulation with elongation at break as high as 76% was achieved. Combining conventional intumescent FR and nanoclay, UL-94 V-0 rating and the LOI value as high as 32.2 were achieved. In conclusion, effective self-extinguishing and non-drip polyamide 6 nanocomposite formulations with significant improvement in toughness and ductility were achieved.

scholarly journals Synergistic influence of halogenated flame retardants and nanoclay on flame performance of high density polyethylene and wood flour composites

RSC Advances ◽  
2017 ◽  
Vol 7 (40) ◽  
pp. 24895-24902 ◽  
Author(s):  
Jinlong Zhang ◽  
Qinglin Wu ◽  
Guangyao Li ◽  
Mei-Chun Li ◽  
Xiuxuan Sun ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
High Density Polyethylene ◽  
Flame Retardants ◽  
Wood Flour ◽  
High Density ◽  
Twin Screw Extrusion ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Processing Aids ◽  
Halogenated Flame Retardants

High density polyethylene and wood flour (HDPE/WF) composites containing three flame modifiers (FMs) (i.e., two fire retardants: 1,2-bis(pentabromophenyl) and ethylene bis(tetrabromophthalimide), and one nanoclay), maleic anhydride grafted polyethylene (MAPE) and other processing aids were prepared through twin-screw extrusion, and their properties were characterized.

scholarly journals Rheological characterization of polymer-based nanocomposites with different nanoscale dispersions

e-Polymers ◽  
2005 ◽  
Vol 5 (1) ◽  
Author(s):  
Dong Gi Seong ◽  
Tae Jin Kang ◽  
Jae Ryoun Youn
Keyword(s):  
Storage Modulus ◽  
Extensional Flow ◽  
Rheological Behaviour ◽  
Polyamide 6 ◽  
Twin Screw Extrusion ◽  
Rheological Characterization ◽  
Melt Compounding ◽  
Transmission Electron ◽  
Screw Extrusion ◽  
Twin Screw

AbstractPolyamide 6 - clay nanocomposites with different nanoscale dispersions were prepared by melt compounding via twin-screw extrusion and their internal structures were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The rheological behaviour of these nanocomposites in shear and extensional flow were investigated using an Advanced Rheometric Expansion System and an Elongational Melts Rheometer in connection with the analysis by XRD and TEM. Nanocomposites with fully exfoliated structure and with poorly dispersed structure showed very different rheological behaviour. In general, addition of clay increased the viscosity and the storage modulus of nanocomposites, but different rheological behaviours were observed depending upon the degree of clay dispersion in the polymer matrix. In shear flow, only the exfoliated nanocomposite showed solid-like plateau behaviour in storage modulus and strong shear-thinning behaviour in shear viscosity. In extensional flow, only fully exfoliated nanocomposites showed strain-hardening behaviour, which is caused by the interaction between nanoparticles as well as between polymer molecules and nanoparticles.

scholarly journals Influence of the dispersion method of modified layered silicate on the structure and properties of mixed composites based on polyamide and functionalized polyolefin

2020 ◽  
Vol 65 (2) ◽  
pp. 177-184
Author(s):  
S. S. Pesetskii ◽  
Yu. M. Krivoguz ◽  
S. P. Bogdanovich
Keyword(s):  
Impact Resistance ◽  
Layered Silicate ◽  
Polyamide 6 ◽  
Single Stage ◽  
Test Method ◽  
Structure And Properties ◽  
Twin Screw Extrusion ◽  
Two Stage ◽  
Twin Screw ◽  
Stage Process

The dependences of the structure and properties of polyamide 6 (PA6) with a functionalized polyolefin (FPO) mixtures on the dispersing method of organically modified clay Cloisite 30В (Cl30В) were studied. The concentration of Cl30B organoclay in PA6/fPO mixtures was constant and amounted to 3.0 wt.%, and the content of fPO varied from 10 to 50 wt.%. Compounding of the mixtures was carried out in the melt using a twin-screw extrusion reactor-mixer. Organoclay was introduced into the composition of the mixtures in two ways: simultaneously with all polymer components (one-stage process) and from the previously obtained Cl30B concentrate into fPO (two-stage process). It is established that the introduction of Cl30B organoclay into the composition of the PA6/fPO mixture using the two-stage technology makes it possible to obtain nanocomposites with increased yield strengths (5–6 %), tensile strength (9–15 %), and elongation at break (1.2–4 times) compared with nanocomposites prepared according to a single-stage technology. At the same time, nanocomposites obtained by a single-stage technology in which PA6 forms a dispersion medium, regardless of the type of incision and the test method, have higher impact resistance (up to 1.2 times) than materials prepared by the two-stage method. This is explained by differences in the degree of dispersion of the nanofiller and the level of interphase interactions between the polymer components and nanoparticles, as a result of which the crystallinity of the components in the mixtures changes, as well as the complex of their rheological and mechanical characteristics. It was also shown that Cl30B organoclay additives, irrespective to the method of its introduction, increase the thermal stability of PA 6/fPO mixtures in comparison with the initial PA6. The results can be used in the development of real technical nanocomposites with improved properties based on PA6 and fPO.

Fluorescence quenching of fluoranthene by maleic anhydride in solution and during nonreactive and reactive twin-screw extrusion

2012 ◽  
Vol 53 (2) ◽  
pp. 295-300
Author(s):  
Amine Methenni ◽  
Frej Mighri ◽  
Saïd Elkoun ◽  
Haixia Fang ◽  
Philippe Cassagnau
Keyword(s):  
Maleic Anhydride ◽  
Fluorescence Quenching ◽  
Twin Screw Extrusion ◽  
Screw Extrusion ◽  
Twin Screw

scholarly journals Process-Induced Fiber Orientation in Fused Filament Fabrication

2018 ◽  
Vol 2 (3) ◽  
pp. 45 ◽  
Author(s):  
Tom Mulholland ◽  
Sebastian Goris ◽  
Jake Boxleitner ◽  
Tim Osswald ◽  
Natalie Rudolph
Keyword(s):  
Thermal Conductivity ◽  
Fiber Orientation ◽  
Polyamide 6 ◽  
Thermoplastic Composite ◽  
Micro Computed Tomography ◽  
Twin Screw Extrusion ◽  
Fused Filament Fabrication ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Thin Walled

As the applications for additive manufacturing have continued to grow, so too has the range of available materials, with more functional or better performing materials constantly under development. This work characterizes a copper-filled polyamide 6 (PA6) thermoplastic composite designed to enhance the thermal conductivity of fused filament fabrication (FFF) parts, especially for heat transfer applications. The composite was mixed and extruded into filament using twin screw extrusion. Because the fiber orientation within the material governs the thermal conductivity of the material, the orientation was measured in the filament, through the nozzle, and in printed parts using micro-computed tomography. The thermal conductivity of the material was measured and achieved 4.95, 2.38, and 0.75 W/(m·K) at 70 °C in the inflow, crossflow, and thickness directions, respectively. The implications of this anisotropy are discussed using the example of an air-to-water crossflow heat exchanger. The lower conductivity in the crossflow direction reduces thermal performance due to the orientation in thin-walled parts.

Mechanical Properties of Polypropylene Based Composites Reinforced with B4C

2013 ◽  
Vol 685 ◽  
pp. 19-23 ◽  
Author(s):  
Ali Sinan Dike ◽  
Harun Mindivan
Keyword(s):  
Mechanical Properties ◽  
Maleic Anhydride ◽  
Yield Strength ◽  
Injection Molding ◽  
Scratch Resistance ◽  
Twin Screw Extrusion ◽  
Elongation At Break ◽  
Screw Extrusion ◽  
Twin Screw

The present work aims to compare the mechanical properties of Polypropylene (PP) based composites reinforced with B4C. Maleic Anhydride Modified Polypropylene (MAPP) was added to improve the B4C-matrix interphase. Processing has been carried out by twin-screw extrusion and injection molding. By adding the B4C particles to the PP and PP+MAPP matrix, the yield strength, shore D hardness, microhardness and relative scratch resistance increased gradually, but PP+MAPP/B4C composites showed better overall mechanical properties than the PP/B4C composites. However, elongation at break values occurred for all composites dropped with the B4C content, and PP+MAPP/B4C composites exhibited lower elongations at break than PP/B4C composites.

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