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

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.

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.

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.

scholarly journals In-Line Rheo-Optical Investigation of the Dispersion of Organoclay in a Polymer Matrix during Twin-Screw Compounding

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2128
Author(s):  
Paulo F. Teixeira ◽  
José A. Covas ◽  
Loïc Hilliou
Keyword(s):  
Local Heating ◽  
Polymer Nanocomposite ◽  
Structural Rearrangement ◽  
Particle Dispersion ◽  
Optical Investigation ◽  
Twin Screw Extrusion ◽  
Clay Particles ◽  
Clay Dispersion ◽  
Screw Extrusion ◽  
Twin Screw

The dispersion mechanisms in a clay-based polymer nanocomposite (CPNC) during twin-screw extrusion are studied by in-situ rheo-optical techniques, which relate the CPNC morphology with its viscosity. This methodology avoids the problems associated with post extrusion structural rearrangement. The polydimethylsiloxane (PDMS) matrix, which can be processed at ambient and low temperatures, is used to bypass any issues associated with thermal degradation. Local heating in the first part of the extruder allows testing of the usefulness of low matrix viscosity to enhance polymer intercalation before applying larger stresses for clay dispersion. The comparison of clay particle sizes measured in line with models for the kinetics of particle dispersion indicates that larger screw speeds promote the break-up of clay particles, whereas smaller screw speeds favor the erosion of the clay tactoids. Thus, different levels of clay dispersion are generated, which do not simply relate to a progressively better PDMS intercalation and higher clay exfoliation as screw speed is increased. Reducing the PDMS viscosity in the first mixing zone of the screw facilitates dispersion at lower screw speeds, but a complex interplay between stresses and residence times at larger screw speeds is observed. More importantly, the results underline that the use of larger stresses is inefficient per se in dispersing clay if sufficient time is not given for PDMS to intercalate the clay galleries and thus facilitate tactoid disruption or erosion.

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