Effect of coupling agents on the thermal and mechanical properties of polypropylene–jute fabric composites

2006 ◽  
Vol 55 (9) ◽  
pp. 1104-1113 ◽  
Author(s):  
Betiana A Acha ◽  
María M Reboredo ◽  
Norma E Marcovich
Keyword(s):  
Mechanical Properties ◽  
Coupling Agents ◽  
Thermal And Mechanical Properties ◽  
Jute Fabric ◽  
Fabric Composites

scholarly journals Poly(Butylene Terephthalate) Based Composites Containing Alumina Whiskers: Influence of Filler Functionalization on Dielectric Properties

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Pietro Russo ◽  
Francesca Cimino ◽  
Domenico Acierno ◽  
Giovanni Lupò ◽  
Carlo Petrarca
Keyword(s):  
Mechanical Properties ◽  
Dielectric Properties ◽  
Dissipation Factor ◽  
Coupling Agents ◽  
High Dimensional ◽  
Relative Dielectric Permittivity ◽  
Thermal And Mechanical Properties ◽  
Commercial Alumina ◽  
Butylene Terephthalate ◽  
Internal Chamber

Poly(butylene terephthalate) (PBT) is one of the most widely used semicrystalline thermoplastics polyester because of its superior thermal and mechanical properties, high dimensional stability and excellent processability. In this research PBT-based nanocomposites, including various amounts (up to 10 wt%) of commercial alumina whiskers, have been prepared by using a Brabender internal chamber mixer and analysed in terms of morphological features and dielectric properties. Specific attention has been focused on the effect of the filler functionalization considering 3-glycidoxy propylmethoxysilane (GPS) or 3-methacryloxypropyltrimethoxysilane (MPS) as coupling agents. Tests, performed on compounds filled with neat and functionalized alumina whiskers, show a clear dependence of relative dielectric permittivityεr, invariance of dissipation factor (tgδ), and a sensible increase of volume electrical resistivity(ρv)with the filler’s content and are encouraging for a future introduction of such composites in many electrical applications.

scholarly journals Chemically Functionalized Cellulose Nanocrystals as Reactive Filler in Bio-Based Polyurethane Foams

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2556
Author(s):  
Francesca Coccia ◽  
Liudmyla Gryshchuk ◽  
Pierluigi Moimare ◽  
Ferdinando de Luca Bossa ◽  
Chiara Santillo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cellulose Nanocrystals ◽  
Aqueous Media ◽  
Polyurethane Foams ◽  
Coupling Agents ◽  
Ftir Analysis ◽  
Thermal And Mechanical Properties ◽  
Efficient Coupling ◽  
Flexible Polyurethane ◽  
Pu Foams

Cellulose Nanocrystals, CNC, opportunely functionalized are proposed as reactive fillers in bio-based flexible polyurethane foams to improve, mainly, their mechanical properties. To overcome the cellulose hydrophilicity, CNC was functionalized on its surface by linking covalently a suitable bio-based polyol to obtain a grafted-CNC. The polyols grafted with CNC will react with the isocyanate in the preparation of the polyurethane foams. An attractive way to introduce functionalities on cellulose surfaces in aqueous media is silane chemistry by using functional trialkoxy silanes, X-Si (OR)3. Here, we report the synthesis of CNC-grafted-biopolyol to be used as a successful reactive filler in bio-based polyurethane foams, PUFs. The alkyl silanes were used as efficient coupling agents for the grafting of CNC and bio-polyols. Four strategies to obtain CNC-grafted-polyol were fine-tuned to use CNC as an active filler in PUFs. The effective grafting of the bio polyol on CNC was evaluated by FTIR analysis, and the amount of grafted polyol by thermogravimetric analysis. Finally, the morphological, thermal and mechanical properties and hydrophobicity of filled PUFs were thoughtfully assessed as well as the structure of the foams and, in particular, of the edges and walls of the cell foams by means of the Gibson–Ashby model. Improved thermal stability and mechanical properties of PU foams containing CNC-functionalized-polyol are observed. The morphology of the PU foams is also influenced by the functionalization of the CNC.

scholarly journals Preparation of Polypropylene/Bentonite Composites of Enhanced Thermal and Mechanical Properties using L-leucine and Stearic Acid as Coupling Agents

2021 ◽  
Vol 11 (3) ◽  
pp. 7207-7216
Author(s):  
N. Mohammedi ◽  
F. Zoukrami ◽  
N. Haddaoui
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Stearic Acid ◽  
Decomposition Temperature ◽  
The Other ◽  
Morphological Observation ◽  
Coupling Agents ◽  
Thermal And Mechanical Properties ◽  
Melt Mixing ◽  
Elongation At Break

The compatibilization of raw bentonite (bent) with a polymer matrix of polypropylene (PP) can improve the performance of the material in terms of thermal and mechanical properties. In this study, two kinds of untreated bentonite, bentonite-Maghnia (bent-m) and bentonite-Mostaganem (bent-M), that differ in the proportion of Al2O3 and in the particle size distribution were coupled to typical maleic anhydride grafted polypropylene PP-MA. Stearic Acid (SA) and L-leucine Amino Acid (AA) were selected as new coupling modifiers at a 5/5 ratio of bentonite/coupling agent. All PP/bent composites were prepared by melt mixing at 190°C. Morphological observation revealed a good dispersion of bentonite into the PP matrix in the presence of AA, SA, and PP-MA. Mechanical properties showed an increase in stiffness as bent-m or bent-M were associated with AA. For instance, PP/bent-m/AA composite underwent an improvement of about 13% in Young’s modulus as compared to neat PP. On the other hand, the addition of SA into bent-m maintained stiffness and tensile strength at an acceptable level. An increase of around 40°C and 37% in the decomposition temperature and elongation at break was respectively observed for the PP/bent-m/SA composite. All coupled composites showed high degradation temperatures.

Highly dispersible laser activate particles via surface modification for laser direct structuring and electroless plating application

2018 ◽  
Vol 53 (10) ◽  
pp. 1377-1386
Author(s):  
Kiho Kim ◽  
Seokgyu Ryu ◽  
Jooheon Kim
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Electroless Plating ◽  
Polyphenylene Sulfide ◽  
Solubility Parameters ◽  
Coupling Agents ◽  
Thermal And Mechanical Properties ◽  
Silane Coupling Agents ◽  
Melt Mixing ◽  
Amino Silane

A composite of laser-activate particles and the super engineering plastic of polyphenylene sulfide was fabricated via melt-mixing. The laser-activate particle surfaces were modified using hydroperoxide and three different silane coupling agents. The laser-activate particles dramatically deteriorate the mechanical properties of polyphenylene sulfide because of its low compatibility with the polymer. However, surface modification, especially via amino silane treatment, effectively prevented the degradation of thermal and mechanical properties upon adding laser-activate particle, while modification with phenyl silane had the reverse effect. In order to confirm the different effects, solubility parameters obtained by theoretical calculation via the group contribution method were compared. Thermally and mechanically enhanced laser-activate particle/polyphenylene sulfide composites were fabricated for laser direct structuring and electroless plating applications.

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