Significant Enhancement of Mechanical and Thermal Properties of Thermoplastic Polyester Elastomer by Polymer Blending and Nanoinclusion (original) (raw)
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Nanocomposites Based on Thermoplastic Polyester Elastomers
Elastomers, 2017
The use of fillers in order to enhance the properties of polymers has been already well documented. Fundamentally, traditional fillers were applied to reduce the cost of the final polymeric products. Moreover, most micron-sized fillers required high loading for slight properties enhancement, thus causing problems in processing and melt flow due to the high viscosity of the obtained composite. Nanofillers might constitute the answer to the requirements made to the modern polymer materials. Nanofillers in the range of 3-5 wt% achieve the same reinforcement as 20-30 wt% of micron-sized fillers. Therefore, this study presents the influence of three different types of nanofillers that differ in shape (aspect ratio) on the morphology, electrical conductivity, and thermal stability of polyester thermoplastic elastomer (TPE) matrix, by means of poly(trimethylene)-blockpoly(tetramethylene oxide) copolymer (PTT-PTMO). The morphology in this copolymer consisted of semicrystalline PTT domains dispersed in the soft phase of amorphous, noncrystallisable PTMO. The PTT-PTMO copolymer has been combined with 0.5 wt% of 1D (single-walled carbon nanotubes (SWCNTs), silicon carbide (SiC) nanofibers), 2D (graphene oxide (GO), graphene nanoplatelets (GNPs)), and 3D (polyhedral oligomeric silsesquioxane (POSS)) through in situ synthesis to obtain nanocomposites (NCs) samples.
Macromolecular Symposia, 1997
A thermotropic liquid crystalline polyester (LCP) with a flexible spacer group in the main chain has been synthesized by polycondensation and mixed with poly(ethy1ene terephthalate) (PET). The influence of the LCP's contents on thermal properties of the blends has been determined by Differential Scanning Calorimetry (DSC). LCP and blends were also characterized by Carbon 13 Nuclear Magnetic Resonance (NMR), Fourier Transform Inbred Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA).
Thermal characterization of thermoplastic elastomeric natural rubber-polypropylene blends
Thermochimica Acta, 1991
The thermal behaviour of natural rubber-polypropylene (NR/PP) thermoplastic elastomeric blends has been studied by a number of different techniques, e.g. differential scanning calorimetry (DSC), thermogravimetry (TG) and dynamic mechanical analysis (DMA). The melting temperature (T,) for polypropylene is 165 o C. DSC results show a drop in the T, value with increasing rubber content. The effect of 20 parts of an interfacial agent, like ethylene-propylene diene rubber (EPDM) or chlorinated polyethylene (CPE), is similar.
Journal of Applied Polymer Science, 2007
The linear thermal expansion coefficients (CLTEs) along flow direction (FD) for the injection‐molded blends composed of isotactic polypropylene (iPP) and various ethylenic thermoplastic elastomers (TPEs) were investigated using a thermo‐mechanical analyzer. The iPP/TPE blends with higher comonomer contents in the TPE showed extremely low CLTE. TEM observation revealed that the array of the TPE whose MFR was adjusted to be higher than the iPP matrix was in lamella‐like sheet stacked normal to normal direction (ND) with being elongated along both FD and transverse‐to‐flow direction. At higher magnification of TEM, the iPP lamellae in the blend with higher comonomer contents in the TPE deeply penetrated into the TPE phase as a consequence of the faster iPP crystallization before the completion of the phase‐separation. Hence, the location of the iPP amorphous chains would change depending on the comonomer contents in the TPE; in the case of the iPP/TPE blend with higher comonomer conten...
Advances in computer science research, 2023
The numerous studies were performed on the polymer blends and their nano-composite, the sub-inclusion of nano-particles in the binary polymer blend modifies thermal and mechanical properties of the system. At the other hand, very few literatures are available in view of the ternary blends of polymers with addition of nano-particles. The ternary polymer blends with their rheological and morphological properties are reviewed in this research work. The specific work is concentrated on PP (polypropylene)-PS (polystyrene)-PMMA (Poly (methyl methacrylate)) ternary blends with or without compatibilizer in presence of the MWNT (Multiwall carbon nanotube) nano-particles and improvement in mechanical and thermal properties of the resulting material were studied. In the literature, Impact of the mixing time and dispersed phase content were observed in relation with volume average diameter and volume percentage. Addition of SEBS (Styrene-ethylene-butylene-styrene) to the PP/PS blend decreases stress at breaking point and increases impact strength. SIS (Polystyrene-block-polyisopreneblock-polystyrene), LUC (maleic anhydride Lucofin R 1492M HG) and PODIC ((Peroxan C126), a dimyristylperoxydicarbonate)) are excellent compatibilizers for enhancing impact Strength.
Dynamic vulcanization of polyethylene-based thermoplastic elastomer blends
Journal of Applied Polymer Science, 2010
In this investigation, the effects of blending with ethylene-propylene-diene terpolymer and subsequent dynamic curing with sulfur on the macromolecular structure and properties of pure low-density polyethylene and high-density polyethylene were studied. The crosslinking efficiency of polyethylene-based ethylene-propylene-diene terpolymer blends upon dynamic curing was assessed with torque and gel content measurements. The curing of dispersed ethylene-propylene-diene terpolymer in a polyethylene matrix improved both the mechanical and thermomechanical properties as a result of the formation of a crosslink structure in the rubber phase. In view of the electrical applications of this cured blend material, the volume resistivity was measured. The thermal stability of vulcanized polyethylene/ethylene-propylene-diene terpolymer blends was found to be superior to that of unvulcanized blends. In scanning electron microscopy analysis, good interface bonding between the polyethylene matrix and dispersed ethylene-propylene-diene terpolymer was observed for the cured blends. V
2011
Polybutylene Terephthalate (PBT) / Polyethylene Terephthalate (PET) nanocomposite blend was fabricated using melt blending technique in a twin extruder. The blend composition was optimized at PBT-PET weight ratio of 8020. The effect of incorporation of Organically Modified Montmorillonite (OMMT) and naturally occurring sodium Montmorillonite (MMT) on the mechanical, thermal and morphological properties of the nanocomposites blend has been investigated. It was observed that the Izod impact strength, tensile strength and flexural strength demonstrated a significant increase with the increase in clay loading from 1-7 weight % due to homogeneous dispersion of clay within the blend matrix. Thermo gravimetric analysis revealed an increase in thermal stability of the blend with the incorporation of nanoclay. There is also decrease in the melting temperature and crystallisation temperature as observed from DSC thermograms. DMA add the evidence for TGA, DSC and mechanical results. PBT - PET ...