scholarly journals Thermal and Mechanical Properties of Polyethylene/Doped-TiO2Nanocomposites Synthesized Using In Situ Polymerization

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
S. H. Abdul Kaleel ◽  
Bijal Kottukkal Bahuleyan ◽  
J. Masihullah ◽  
Mamdouh Al-Harthi
Keyword(s):  
Mechanical Properties ◽  
In Situ Polymerization ◽  
Filler Concentration ◽  
Thermal And Mechanical Properties ◽  
Scanning Calorimetry ◽  
Polyethylene Matrix ◽  
Highly Active ◽  
Nanoparticles Dispersion ◽  
Temperature And Pressure

Ethylene polymerization was carried out using highly active metallocene catalysts (Cp2ZrCl2and Cp2TiCl2) in combination with methylaluminoxane. Titanium (IV) oxide containing 1% Mn as dopant was used as nanofillers. The effects of filler concentration, reaction temperature, and pressure on the thermal and mechanical properties of polymer were analyzed. The improvement of nanoparticles dispersion in the polyethylene matrix was checked by WAXD. The thermal properties were analyzed using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The filler impact on the melting temperature of polyethylene synthesized using Cp2ZrCl2was very minimal which is due to the degree of short-chain branching. The ash content was also analyzed for each nanocomposite and found to be in line with the activity of the catalyst. There was a significant increase in the mechanical properties of the polyethylene by addition of filler.

scholarly journals Fabrication, Crystalline Behavior, Mechanical Property and In-Vivo Degradation of Poly(l–lactide) (PLLA)–Magnesium Oxide Whiskers (MgO) Nano Composites Prepared by In-Situ Polymerization

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1123 ◽  
Author(s):  
Hui Liang ◽  
Yun Zhao ◽  
Jinjun Yang ◽  
Xiao Li ◽  
Xiaoxian Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Oxide ◽  
Bone Repair ◽  
In Situ Polymerization ◽  
Resonance Spectroscopy ◽  
Scanning Calorimetry ◽  
Biomedical Material ◽  
In Vivo Degradation

The present work focuses on the preparation of poly(l–lactide)–magnesium oxide whiskers (PLLA–MgO) composites by the in-situ polymerization method for bone repair and implant. PLLA–MgO composites were evaluated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and solid-state 13C and 1H nuclear magnetic resonance spectroscopy (NMR). It was found that the whiskers were uniformly dispersed in the PLLA matrix through the interfacial interaction bonding between PLLA and MgO; thereby, the MgO whisker was found to be well-distributed in the PLLA matrix, and biocomposites with excellent interface bonding were produced. Notably, the MgO whisker has an effect on the crystallization behavior and mechanical properties; moreover, the in vivo degradation of PLLA–MgO composites could also be adjusted by MgO. These results show that the whisker content of 0.5 wt % and 1.0 wt % exhibited a prominent nucleation effect for the PLLA matrix, and specifically 1.0 wt % MgO was found to benefit the enhanced mechanical properties greatly. In addition, the improvement of the degrading process of the composite illustrated that the MgO whisker can effectively regulate the degradation of the PLLA matrix as well as raise its bioactivity. Hence, these results demonstrated the promising application of PLLA–MgO composite to serve as a biomedical material for bone-related repair.

scholarly journals The Effect of Boron Nitride on the Thermal and Mechanical Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 940 ◽  
Author(s):  
Mualla Öner ◽  
Gülnur Kızıl ◽  
Gülşah Keskin ◽  
Celine Pochat-Bohatier ◽  
Mikhael Bechelany
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Boron Nitride ◽  
Young’S Modulus ◽  
Mechanical Performance ◽  
Young's Modulus ◽  
Filler Concentration ◽  
Gravimetric Analysis ◽  
Thermal And Mechanical Properties ◽  
Scanning Calorimetry

The thermal and mechanical properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate, PHBV) composites filled with boron nitride (BN) particles with two different sizes and shapes were studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), thermal gravimetric analysis (TGA) and mechanical testing. The biocomposites were produced by melt extrusion of PHBV with untreated BN and surface-treated BN particles. Thermogravimetric analysis (TGA) showed that the thermal stability of the composites was higher than that of neat PHBV while the effect of the different shapes and sizes of the particles on the thermal stability was insignificant. DSC analysis showed that the crystallinity of the PHBV was not affected significantly by the change in filler concentration and the type of the BN nanoparticle but decreasing of the crystallinity of PHBV/BN composites was observed at higher loadings. BN particles treated with silane coupling agent yielded nanocomposites characterized by good mechanical performance. The results demonstrate that mechanical properties of the composites were found to increase more for the silanized flake type BN (OSFBN) compared to silanized hexagonal disk type BN (OSBN). The highest Young’s modulus was obtained for the nanocomposite sample containing 1 wt.% OSFBN, for which increase of Young’s modulus up to 19% was observed in comparison to the neat PHBV. The Halpin–Tsai and Hui–Shia models were used to evaluate the effect of reinforcement by BN particles on the elastic modulus of the composites. Micromechanical models for initial composite stiffness showed good correlation with experimental values.

Preparation PET Hybrided Materials by In Situ Polymerization for Delustered Fibers

2017 ◽  
Vol 898 ◽  
pp. 2166-2173
Author(s):  
Mahgoub Osman Montaser ◽  
Jia Liang Zhou ◽  
Mohamed Nourrein ◽  
Chong Li ◽  
Heng Xue Xiang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Hybrid Materials ◽  
In Situ Polymerization ◽  
High Load ◽  
Scanning Calorimetry ◽  
Chemical Structures ◽  
Master Batch ◽  
Scanning Electron

A series of polyethylene terephthalate (PET) hybrid materials with high-load TiO2 content were prepared via in situ polymerization by dispersing unmodified titanium dioxide (TiO2) in Ethylene Glycol (EG), and the influence of load TiO2 nanofillers on the physical properties of PET masterbatch was investigated. The intrinsic viscosities of the prepared PET hybrid materials were affected by the addition of the nanoparticles and in both cases a slight decrease was observed. In addition, the thermal behavior of these PET hybrid materials and neat PET was investigated using Differential Scanning Calorimetry (DSC). The chemical structures of PET hybrid materials were characterized by Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM). The TiO2 nanoparticles show well dispersibility in PET matrix. The PET hybrid material with 40wt.% TiO2 content was used as master batch to prepare full dull PET fiber with 2.5 wt.% TiO2. The melt flow ability of PET hybrid materials shows good winding and drawing performance, and also the resulted fiber has better mechanical properties than neat PET fiber. It suggests that this PET/TiO2 masterbatch by in situ polymerization may find good application for delustered fiber preparation.

An in situ polymerization approach for functionalized MoS2/nylon-6 nanocomposites with enhanced mechanical properties and thermal stability

2015 ◽  
Vol 3 (47) ◽  
pp. 24112-24120 ◽  
Author(s):  
Xin Wang ◽  
Ehsan Naderi Kalali ◽  
De-Yi Wang
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
In Situ Polymerization ◽  
Nylon 6 ◽  
Interfacial Interaction ◽  
Thermal And Mechanical Properties

The enhancement in the thermal and mechanical properties of polymer/inorganic nanosheet composites depends strongly on their interfacial interaction.

Dielectric, thermal and mechanical properties of hybrid PMMA/RGO/Fe2O3 nanocomposites fabricated by in-situ polymerization

2020 ◽  
Vol 46 (5) ◽  
pp. 5828-5840 ◽  
Author(s):  
Yasir Ul-Haq ◽  
Imran Murtaza ◽  
Sadaf Mazhar ◽  
Rizwan Ullah ◽  
Mahmood Iqbal ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
In Situ Polymerization ◽  
Thermal And Mechanical Properties

Comparative study of the thermal and mechanical properties of nanocomposites prepared by in situ polymerization of ε-caprolactone and functionalized carbon nanotubes

2012 ◽  
Vol 33 (4) ◽  
pp. 562-572 ◽  
Author(s):  
Víctor H. Antolín-Cerón ◽  
Sergio Gómez-Salazar ◽  
Martin Rabelero ◽  
Víctor Soto ◽  
Gabriel Luna-Bárcenas ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Comparative Study ◽  
In Situ Polymerization ◽  
Thermal And Mechanical Properties ◽  
Functionalized Carbon Nanotubes

Polyethylene Functionalized Multi-Walled Carbon Nanotubes via In Situ Polymerization

2012 ◽  
Vol 573-574 ◽  
pp. 1163-1166
Author(s):  
Shi Yun Li ◽  
De Sheng Hu
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Storage Modulus ◽  
Raman Spectra ◽  
In Situ Polymerization ◽  
Thermal And Mechanical Properties ◽  
The Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The MWNTs/PE nanocomposites are prepared by in situ polymerization with mulltiwalled carbon nanotubes (MWNTs) supported Cp2ZrCl2 catalyst and MAO as cocatalyst. The SEM and AFM results show that MWNTs are exfoliated and homogenously dispersed in PE matrix by the in situ polymerization. The up-shifting of the G band in Raman spectra show the strong compressive forces associated with PE chains on the MWNTs. The storage modulus of the MWNTs/PE nanocomposite can be increased by 160% even at low amount of MWNTs (0.2 wt %) due to MWNTs well-dispersed and exfoliated in the matrix. The TGA and DMA tests point to significant improvements on thermal and mechanical properties of the PE/MWNTs nanocomposites compared to pure PE.

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