scholarly journals Understanding the Morphological Changes in the Polypropylene/Polyamide 6 Fifty/Fifty Blends by Interfacial Modifiers Based on Grafted Atactic Polypropylenes: Microscopic, Mechanical, and Thermal Characterization

2015 ◽  
Vol 2015 ◽  
pp. 1-24 ◽  
Author(s):  
E. P. Collar ◽  
J. Taranco ◽  
S. Areso ◽  
Jesús María García-Martínez
Keyword(s):  
Phase Contrast ◽  
Morphological Changes ◽  
Test Procedure ◽  
Thermal Characterization ◽  
Polyamide 6 ◽  
Ternary Blend ◽  
Mechanical And Thermal Properties ◽  
Flow Conditions ◽  
Atactic Polypropylene ◽  
Confined Flow

The main aim of the present work is to correlate the morphological changes observed in the modified PP/PA6 fifty/fifty blends molded at confined flow conditions with both their mechanical and thermal properties and the kind and the amount of the interfacial modifiers used. Both transmitted light optical microscopy in the positive phase contrast mode, PC TOM, and field emission scanning electronic microscopy, FE SEM, were the used techniques for, respectively, general morphology overview and fractures surface analysis. The interfacial modifiers, a succinic anhydride, aPP-SA, and a succinyl-fluorescein, aPP-SF/SA, grafted atactic polypropylenes obtained and well characterized in authors’ laboratories came from the chemical modification of an atactic polypropylene industrial by-product. The amounts of any of both the interfacial modifiers came coded by the Box-Wilson experiment design methodology applied to the overall PP/PA6 binary system, watching that the interfacial agent was not a third component on a ternary blend but a true interfacial modifier in a binary one. All the studies were carried out over suitable specimens according to each test procedure with no further material manipulations to preserve at any moment the morphology of the blends as they emerge from the compression molding step at confined flow conditions.

scholarly journals Compatibilization of Polypropylene/Polyamide 6 Blend Fibers Using Photo-Oxidized Polypropylene

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 81 ◽  
Author(s):  
Francesco La Mantia ◽  
Manuela Ceraulo ◽  
Maria Mistretta ◽  
Luigi Botta ◽  
Marco Morreale
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Morphological Changes ◽  
Elongational Flow ◽  
Polyamide 6 ◽  
Flow Conditions ◽  
Polyolefin Blends ◽  
Pp Blends ◽  
Oxidized Polypropylene

The use of polyamide/polyolefin blends has gained importance and concern for years, but they also show some issues to be adequately addressed, such as the incompatibility between the two components. This is usually overcome by using suitable compatibilizers, typically based on functionalized polyolefins. However, there is only little information about the use of a degraded polyolefins to induce compatibilization. This is even truer, as far as polyamide 6/polypropylene (PA6/PP) blends are concerned. In this work, compatibilization of PA6/PP blends by using small amounts of photo-oxidized PP was investigated; furthermore, the effects due to the presence of the photo-oxidized PP were studied also in relationship to the spinning operation, where the existence of the non-isothermal elongational flow can lead to significant, further morphological changes. It was found that isotropic samples showed significant enhancements of the tensile properties upon adding the photo-oxidized PP. Under non-isothermal elongational flow conditions, the presence of the photo-oxidized PP was particularly effective in improving the mechanical properties in comparison to the uncompatibilized blend fibers. Furthermore, an important result was found: The elongational-flow processing allowed obtaining anisotropic samples where the improvements of the properties, in comparison to the isotropic samples, were similar to those achieved by using a compatibilizer.

Thermal characterization of ABS-Graphene blended three dimensional printed functional prototypes for electro chemical energy storage

2018 ◽  
Vol 1 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Kamaljit Singh Boparai ◽  
Rupinder Singh
Keyword(s):  
Energy Storage ◽  
Structural Changes ◽  
Fused Deposition Modeling ◽  
Morphological Changes ◽  
Three Dimensional ◽  
Thermal Characterization ◽  
Chemical Energy ◽  
Flow Index ◽  
Fused Deposition

This study highlights the thermal characterization of ABS-Graphene blended three dimensional (3D) printed functional prototypes by fused deposition modeling (FDM) process. These functional prototypes have some applications as electro-chemical energy storage devices (EESD). Initially, the suitability of ABS-Graphene composite material for FDM applications has been examined by melt flow index (MFI) test. After establishing MFI, the feedstock filament for FDM has been prepared by an extrusion process. The fabricated filament has been used for printing 3D functional prototypes for printing of in-house EESD. The differential scanning calorimeter (DSC) analysis was conducted to understand the effect on glass transition temperature with the inclusion of Graphene (Gr) particles. It has been observed that the reinforced Gr particles act as a thermal reservoir (sink) and enhances its thermal/electrical conductivity. Also, FT-IR spectra realized the structural changes with the inclusion of Gr in ABS matrix. The results are supported by scanning electron microscopy (SEM) based micrographs for understanding the morphological changes.

Mechanical and thermal characterization of grafted PP-NCC nanocomposites

2019 ◽  
pp. 089270571987822
Author(s):  
Saud Aldajah ◽  
Mohammad Y Al-Haik ◽  
Waseem Siddique ◽  
Mohammad M Kabir ◽  
Yousef Haik
Keyword(s):  
Thermal Properties ◽  
Interfacial Adhesion ◽  
Thermal Characterization ◽  
Mechanical And Thermal Properties ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Three Point Bending ◽  
Twin Screw ◽  
Thermal Stability Of

This study reveals the enhancement of mechanical and thermal properties of maleic anhydride-grafted polypropylene (PP- g-MA) with the addition of nanocrystalline cellulose (NCC). A nanocomposite was manufactured by blending various percentages of PP, MA, and NCC nanoparticles by means of a twin-screw extruder. The influence of varying the percentages of NCC on the mechanical and thermal behavior of the nanocomposite was studied by performing three-point bending, nanoindentation, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and Fourier-transform infrared (FTIR) spectroscopy tests. The novelty of this study stems on the NCC nanoparticles and their ability to enhance the mechanical and thermal properties of PP. Three-point bending and nanoindentation tests revealed improvement in the mechanical properties in terms of strength, modulus, and hardness of the PP- g-MA nanocomposites as the addition of NCC increased. SEM showed homogeneity between the mixtures which proved the presence of interfacial adhesion between the PP- g-MA incorporated with NCC nanoparticles that was confirmed by the FTIR results. DSC and TGA measurements showed that the thermal stability of the nanocomposites was not compromised due to the addition of the coupling agent and reinforced nanoparticles.

scholarly journals Mechanical and Thermal Characterization of Natural Intralaminar Hybrid Composites Based on Sisal

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 866 ◽  
Author(s):  
Alexandre L. Pereira ◽  
Mariana D. Banea ◽  
Jorge S.S. Neto ◽  
Daniel K.K. Cavalcanti
Keyword(s):  
Thermal Properties ◽  
Natural Fiber ◽  
Hybrid Composites ◽  
Thermal Characterization ◽  
Mechanical And Thermal Properties ◽  
Scanning Calorimetry ◽  
Sem Images ◽  
The Matrix ◽  
American Society ◽  
Curaua Fibers

The main objective of this work was to investigate the effect of hybridization on the mechanical and thermal properties of intralaminar natural fiber-reinforced hybrid composites based on sisal. Ramie, sisal and curauá fibers were selected as natural fiber reinforcements for the epoxy matrix based composites, which were produced by the hand lay-up technique. Tensile, flexural and impact tests were carried out according to American society for testing and materials (ASTM) standards to characterize the hybrid composites, while differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to evaluate the thermal properties. It was found that the mechanical properties are improved by hybridization of sisal based composites. The thermal analysis showed that the hybridization did not significantly affect the thermal stability of the composites. A scanning electron microscopy (SEM) was used to examine the fracture surface of the tested specimens. The SEM images showed a brittle fracture of the matrix and fiber breakage near the matrix.

scholarly journals 3D visualization of the lumbar facet joint after degeneration using propagation phase contrast micro-tomography

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Yong Cao ◽  
Yi Zhang ◽  
Xianzhen Yin ◽  
Hongbin Lu ◽  
Jianzhong Hu ◽  
...  
Keyword(s):  
Subchondral Bone ◽  
Phase Contrast ◽  
Facet Joint ◽  
3D Visualization ◽  
Early Stage ◽  
Morphological Changes ◽  
Diagnostic Tools ◽  
Lumbar Facet Joint ◽  
Micro Tomography ◽  
Lumbar Facet

Abstract Lumbar facet joint (LFJ) degeneration is believed to be an important cause of low back pain (LBP). Identifying the morphological changes of the LFJ in the degeneration process at a high-resolution level could be meaningful for our better understanding of the possible mechanisms underlying this process. In the present study, we determined the 3D morphology of the LFJ using propagation phase contrast micro-tomography (PPCT) in rats to assess the subtle changes that occur during the degeneration process. PPCT provides vivid 3D images of micromorphological changes in the LFJ during its degeneration process, and the changes in the subchondral bone occurred earlier than in the cartilage during the early stage of degeneration of the LFJ. The delineation of this alteration was similar to that with the histological method. Our findings demonstrated that PPCT could serve as a valuable tool for 3D visualization of the morphology of the LFJ by providing comprehensive information about the cartilage and the underlying subchondral bone and their changes during degeneration processes. It might also have great potential for providing effective diagnostic tools to track changes in the cartilage and to evaluate the effects of therapeutic interventions for LFJ degeneration in preclinical studies.

In Situ Polymerization Organic-Inorganic Hybrid Materials Monomer Casting Polyamide 6/ Nanorods Yttrium Hydroxide

2013 ◽  
Vol 662 ◽  
pp. 24-27 ◽  
Author(s):  
Wei He ◽  
Mi Zhuang ◽  
Yan Xin Li ◽  
A.S. Luyt ◽  
Tie Jun Ge
Keyword(s):  
Mass Fraction ◽  
Synthesis Method ◽  
Polyamide 6 ◽  
Mechanical And Thermal Properties ◽  
Sem Images ◽  
Inorganic Particles ◽  
Yttrium Hydroxide ◽  
Alkaline Conditions ◽  
The Impact

Single crystalline Y(OH)3 nanorods were synthesized from Y2O3 powder by a simple hydrothermal synthesis method under alkaline conditions. SEM images displayed that the nanorods have average diameters of about 400nm and lengths up to several micrometers. In this paper, it is used nano-inorganic particles yttrium hydroxide to modified MC nylon. The different mass fraction of yttrium hydroxide has affected mechanical and thermal properties of the MC nylon composites. The results show that with increasing of the mass fraction of yttrium hydroxide, the impact strength is the highest value when yttrium hydroxide mass fraction of 0.25wt%, however the tensile strength decrease 20%. And there is a little change in thermal stability when Yttrium Hydroxide added.

PHASE-CONTRAST MICROSCOPY STUDIES OF EARLY CISPLATIN-INDUCED MORPHOLOGICAL CHANGES OF MALIGNANT MESOTHELIOMA CELLS AND THE CORRESPONDENCE TO INDUCED APOPTOSIS

2008 ◽  
Vol 34 (2) ◽  
pp. 49-67 ◽  
Author(s):  
Veronica Janson ◽  
Parviz Behnam-Motlagh ◽  
Roger Henriksson ◽  
Per Hörstedt ◽  
Karl Gunnar Engström ◽  
...  
Keyword(s):  
Malignant Mesothelioma ◽  
Phase Contrast ◽  
Morphological Changes ◽  
Phase Contrast Microscopy ◽  
Contrast Microscopy ◽  
Induced Apoptosis

Effects of 3-APTMS-Modified Nano-SiO2 on the Mechanical Properties and Crystallization Behavior of Polyamide-6

2016 ◽  
Vol 869 ◽  
pp. 314-319
Author(s):  
Breno D. Queiroz ◽  
Vitor L.P. Janzantti ◽  
José Donato Ambrósio
Keyword(s):  
Residence Time ◽  
Rotational Speed ◽  
Polyamide 6 ◽  
Processing Parameters ◽  
Solution Viscosity ◽  
Mechanical And Thermal Properties ◽  
Melt Blending ◽  
Scanning Calorimetry ◽  
Capillary Rheometry ◽  
Filling Volume

Nanocomposites of polyamide-6 with nanoSiO2 surface modified by 3-aminopropyltrimethoxysilane (3-APTMS) were prepared by melt blending in torque rheometer. Chemical modification of nanoparticles surface with 3-APTMS were observed by FTIR. Prior to nanocomposites processing, neat polyamide-6 (PA-6) was processed in a torque rheometer with varying processing parameters: polymer residence time in the chamber, rollers rotational speed, and polymer filling volume in the chamber. Two levels for each parameter were fixed. The influence of these parameters on degradation of PA-6 was determined by dilute solution viscosity and capillary rheometry. Results indicate that the best condition was achieved with the higher polymer residence time in the chamber, the higher rollers rotational speed, and the higher polymer filling volume in the chamber. With this information, PA-6 pellets were mixed with nanosilica particles unmodified and surface-capped by 3-APTMS via melt blending in torque rheometer, obtaining PA-6 composites with 1 wt.% of nanofillers. Mechanical and thermal properties of nanocomposites were evaluated by means of tensile test and differential scanning calorimetry (DSC).

Sign in / Sign up

Export Citation Format

Share Document