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.

The crystallization, thermal and mechanical properties of nano‐Sb 2 O 3 filled poly(butylene terephthalate)

2019 ◽  
Vol 26 (3) ◽  
pp. 268-281
Author(s):  
Jianlin Xu ◽  
Chenghu Kang ◽  
Lei Niu ◽  
Chengcheng Xu ◽  
Jianbin Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal And Mechanical Properties ◽  
Butylene Terephthalate

scholarly journals Effect of Diatomaceous Biosilica and Talc on the Properties of Dielectric Elastomer Based Composites

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5828
Author(s):  
Ewa Olewnik-Kruszkowska ◽  
Weronika Brzozowska ◽  
Arkadiusz Adamczyk ◽  
Magdalena Gierszewska ◽  
Izabela Wojtczak ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Environmentally Friendly ◽  
Polymeric Materials ◽  
Dielectric Elastomer ◽  
Thermal And Mechanical Properties ◽  
Valuable Source ◽  
Natural Fillers

Currently, scientists are still looking for new polymeric materials characterized by improved mechanical, thermal as well as dielectric properties. Moreover, it should be stressed that new composites should be environmentally friendly. For this reason, the aim of this work is to establish the influence of natural fillers in the form of diatomaceous biosilica (B) and talc (T) on the properties of dielectric elastomer (DE)-based composites. The dielectric elastomer-based materials have been tested taking into account their morphology, thermal and mechanical properties. Moreover, the dielectric constant of the obtained materials was evaluated. Obtained results revealed that the presence of both diatomaceous biosilica and talc significantly increases dielectric properties while having no significant effect on the mechanical properties of the obtained composites. It should be stressed that the performed analyses constitute a valuable source of knowledge on the effective modification of the thermal and dielectric properties of newly obtained materials.

The effect of bis allyl benzoxazine on the thermal, mechanical and dielectric properties of bismaleimide–cyanate blend polymers

RSC Advances ◽  
2015 ◽  
Vol 5 (72) ◽  
pp. 58821-58831 ◽  
Author(s):  
Yiqun Wang ◽  
Kaichang Kou ◽  
Guanglei Wu ◽  
Ailing Feng ◽  
Longhai Zhuo
Keyword(s):  
Mechanical Properties ◽  
Dielectric Properties ◽  
Polymer Composite ◽  
High Performance ◽  
Cross Linking ◽  
Thermal And Mechanical Properties ◽  
High Performance Polymer ◽  
The Cross

A high-performance polymer composite was fabricated using Bz-allyl/BMI/BADCy resin, in which the BMI/BADCy resin was modified with Bz-allyl to improve its dielectric, thermal and mechanical properties and the cross-linking degree after curing.

Fine structure and physical properties of poly(butylene terephthalate) sheets prepared by roll drawing

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Sunhee Lee ◽  
Kazuo Nakayama ◽  
Hyunhok Cho
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Fine Structure ◽  
Physical Properties ◽  
Molecular Orientation ◽  
Thermal And Mechanical Properties ◽  
Butylene Terephthalate ◽  
Orientation Effects ◽  
Axial Form ◽  
Drawing Method

AbstractPBT sheets were extruded from T-die using a single extruder and were winded by a take-up roller controlled at 50°C and with speed at 1.2 m/min. Oriented PBT sheets were prepared with various winding roll speeds at 3.6, 4.8 and 6.0 m/min. Fine structure and physical properties of PBT sheets thus obtained were investigated by measuring the molecular orientation, crystal structure, dynamic visco-elasticity, thermal and mechanical properties, sonic modulus, etc. PBT melts were found to be readily crystallizable in the sheet. In the case of roll drawing, the DRmax of PBT sheet was 5. The PBT sheets prepared from winding speed at 6 m/min showed polymorphism of both α- and β-form crystallites with crystallinity of about 24%. In the tri-directional WAXD patterns, the PBT sheets by the roll drawing method turned out to be oriented in the uniplanar-axial form. For the roll drawn PBT sheets with various winding speeds, large orientation effects were observed in the winding direction together with improved thermal and mechanical properties.

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.

Thermal and mechanical properties of poly(butylene terephthalate)/epoxy blends

2008 ◽  
Vol 109 (6) ◽  
pp. 4082-4088 ◽  
Author(s):  
Huiliang Zhang ◽  
Shulin Sun ◽  
Minqiao Ren ◽  
Qingyong Chen ◽  
Jianbin Song ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal And Mechanical Properties ◽  
Butylene Terephthalate ◽  
Epoxy Blends
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