Morphological and thermal characterization of an immiscible catalyzed polymer blends (PC/PET)

Poly Ethylene ◽

Two Phases

The aim is to study the reactive compatibilization of two immiscible thermoplastic polyesters, namely polycarbonate (PC) and poly (ethylene terephthalate) (PET), by transesterification reactions through melt compounding. For this, a catalyst, which is hydrated samarium acetylacetonate (Sm(acac)3), is incorporated with concentrations of 0.10, 0.15 and 0.20 phr into the 70PC/30PET mixture. The characterization of the PC/PET blends by differential scanning calorimetry (DSC) revealed that, the transesterification reactions in the absence of catalyst are undetectable or practically impossible; however, by increasing the catalyst concentration, significant variations are noticed on the thermal properties. These modifications, due to the interfacial reactions between the two phases of the system, were also evidenced by variations in morphological properties observed after the study of atomic force microscopy (AFM).

Electrical, Thermal, and Morphological Properties of Poly(ethylene terephthalate)-Graphite Nanoplatelets Nanocomposites

International Journal of Polymer Science ◽

10.1155/2017/6758127 ◽

2017 ◽

Vol 2017 ◽

pp. 1-9 ◽

Cited By ~ 3

Author(s):

Basheer A. Alshammari ◽

Arthur N. Wilkinson ◽

Ghzzai Almutairi

Keyword(s):

Electrical Conductivity ◽

Percolation Threshold ◽

Ethylene Terephthalate ◽

Threshold Value ◽

Morphological Properties ◽

Degree Of Crystallinity ◽

Graphite Nanoplatelets ◽

Melt Compounding ◽

Graphite nanoplatelets (GNP) were incorporated with poly(ethylene terephthalate) (PET) matrix by melt-compounding technique using minilab compounder to produce PET-GNP nanocomposites, and then the extruded nanocomposites were compressed using compression molding to obtain films of 1 mm thickness. Percolation threshold value was determined using percolation theory. The electrical conductivity, morphology, and thermal behaviors of these nanocomposites were investigated at different contents of GNP, that is, below, around, and above its percolation threshold value. The results demonstrated that the addition of GNP at loading >5 wt.% made electrically conductive nanocomposites. An excellent electrical conductivity of ~1 S/m was obtained at 15 wt.% of GNP loading. The nanocomposites showed a typical insulator-conductor transition with a percolation threshold value of 5.7 wt.% of GNP. In addition, increasing screw speed enhanced the conductivity of the nanocomposites above its threshold value by ~2.5 orders of magnitude; this behavior is attributed to improved dispersion of these nanoparticles into the PET matrix. Microscopies results exhibited no indication of aggregations at 2 wt.% of GNP; however, some rolling up at 6 wt.% of GNP contents was observed, indicating that a conductive network has been formed, whereas more agglomeration and rolling up could be seen as the GNP content is increased in the PET matrix. These agglomerations reduced their aspect ratio and then reduced their reinforcement efficiency. NP loading (>2 wt.%) increased degree of crystallinity and improved thermal stability of matrix slightly, suggesting that 2 wt.% of GNP is more than enough to nucleate the matrix.

Investigation of Morphology of Recycled PET by Modulated DSC

Materials Science Forum ◽

10.4028/www.scientific.net/msf.885.263 ◽

2017 ◽

Vol 885 ◽

pp. 263-268

Author(s):

Bela Molnar ◽

Ferenc Ronkay

Keyword(s):

Heat Flow ◽

Morphological Properties ◽

Modulated Dsc ◽

Scanning Calorimetry ◽

Total Heat Flow ◽

Recycled Pet ◽

Modulated Differential Scanning Calorimetry ◽

Injection Molded ◽

During research injection molded samples were made from recycled poly (ethylene terephthalate) (PET). Morphological properties of samples were investigated by modulated differential scanning calorimetry (MDSC). Total heat flow was separated in two parts, reversing and non-reversing heat flow during measurements. Relationships were found between crystallization and melting processes: the initial crystallinity equals to the non-reversing melting, and the post-crystallization processes equals to reversing melting.

Preparation and characterization of solution blended poly(ethylene terephthalate-co-ethylene furandicarboxylate) and poly(lactic acid)

Future Energy, Environment and Materials ◽

10.2495/feem130771 ◽

2014 ◽

Author(s):

Hae-Ri Kim ◽

Byeong-Uk Nam ◽

Yeon-Hee Kim

Keyword(s):

Lactic Acid ◽

Ethylene Terephthalate ◽

Poly Lactic Acid ◽

Mechanical and thermal characterization of grafted PP-NCC nanocomposites

Journal of Thermoplastic Composite Materials ◽

10.1177/0892705719878226 ◽

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.

Structural, thermal and electrical properties of composites electrolytes (1−x) CsH2PO4/x ZrO2 (0 ≤ x ≤ 0.4) for fuel cell with advanced electrode

SN Applied Sciences ◽

10.1007/s42452-020-04097-9 ◽

2021 ◽

Vol 3 (1) ◽

Author(s):

Deshraj Singh ◽

Pawan Kumar ◽

Jitendra Singh ◽

Dharm Veer ◽

Aravind Kumar ◽

...

Keyword(s):

Fuel Cell ◽

Solid Acid ◽

Thermal Characterization ◽

Dihydrogen Phosphate ◽

Conducting Material ◽

Scanning Calorimetry ◽

Milling Method ◽

Thermal And Electrical Properties ◽

Properties Of Composites

AbstractComposites proton conducting material based on cesium dihydrogen phosphate (CDP) doped with zirconium oxide (1−x) CsH2PO4/x ZrO2 were synthesized with different concentration having in the range such as x = 0.1, 0.2, 0.3 and 0.4 by ball milling method. The prepared solid acid composites were dried at 150 °C for 6 h. Structural and thermal characterization of solid acid composite proton electrolytes were carried out by X-ray diffractometer, Fourier transform infrared spectroscopy, and Raman spectroscopy respectively. Phase transition of the prepared materials was carried out by using differential scanning calorimetry and conductivity was measured by LC Impedance meter in the range 1 Hz to 400 kHz. The ionic conductivity of ZrO2 doped CsH2PO4 (CDP) was increased up to 1.3 × 10–2 S cm−1 at the 280 °C under environment atmospheric humidification which showed high stability as compared to pure CsH2PO4 (CDP). This obtaining result would be useful for establishing and design the next generation fuel cell.

Comparative Study of Structural Changes of Polylactide and Poly(ethylene terephthalate) in the Presence of Trichoderma viride

International Journal of Molecular Sciences ◽

10.3390/ijms22073491 ◽

2021 ◽

Vol 22 (7) ◽

pp. 3491

Author(s):

Grażyna B. Dąbrowska ◽

Zuzanna Garstecka ◽

Ewa Olewnik-Kruszkowska ◽

Grażyna Szczepańska ◽

Maciej Ostrowski ◽

...

Keyword(s):

Structural Changes ◽

Ethylene Terephthalate ◽

Molecular Mechanisms ◽

Blot Hybridization ◽

Trichoderma Viride ◽

Cost Effective ◽

Plastic Pollution ◽

Scanning Calorimetry ◽

Plastic pollution is one of the crucial global challenges nowadays, and biodegradation is a promising approach to manage plastic waste in an environment-friendly and cost-effective way. In this study we identified the strain of fungus Trichoderma viride GZ1, which was characterized by particularly high pectinolytic activity. Using differential scanning calorimetry, Fourier-transform infrared spectroscopy techniques, and viscosity measurements we showed that three-month incubation of polylactide and polyethylene terephthalate in the presence of the fungus lead to significant changes of the surface of polylactide. Further, to gain insight into molecular mechanisms underneath the biodegradation process, western blot hybridization was used to show that in the presence of poly(ethylene terephthalate) (PET) in laboratory conditions the fungus produced hydrophobin proteins. The mycelium adhered to the plastic surface, which was confirmed by scanning electron microscopy, possibly due to the presence of hydrophobins. Further, using atomic force microscopy we demonstrated for the first time the formation of hydrophobin film on the surface of aliphatic polylactide (PLA) and PET by T. viride GZ1. This is the first stage of research that will be continued under environmental conditions, potentially leading to a practical application.

A differential scanning calorimetry study on poly(ethylene terephthalate) isothermally crystallized at stepwise temperatures: multiple melting behavior re-investigated

Colloid & Polymer Science ◽

10.1007/bf00654051 ◽

1996 ◽

Vol 274 (4) ◽

pp. 309-315 ◽

Cited By ~ 26

Author(s):

E. M. Woo ◽

T. Y. Ko

Keyword(s):

Differential Scanning Calorimetry ◽

Ethylene Terephthalate ◽

Melting Behavior ◽

Scanning Calorimetry ◽

Differential Scanning Calorimetry Study ◽

Multiple Melting Behavior ◽

Poly Ethylene ◽

Multiple Melting

Identification of LDPE Grades Focusing on Specific CH2 Raman Vibration Modes

International Journal of Spectroscopy ◽

10.1155/2013/720598 ◽

2013 ◽

Vol 2013 ◽

pp. 1-6 ◽

Cited By ~ 3

Author(s):

Richard Jumeau ◽

Patrice Bourson ◽

Michel Ferriol ◽

François Lahure ◽

Marc Ponçot ◽

...

Keyword(s):

Differential Scanning Calorimetry ◽

Raman Spectroscopy ◽

Vibrational Spectroscopy ◽

Phenomenological Model ◽

Low Density ◽

Vibration Modes ◽

Scanning Calorimetry ◽

Lamella Thickness ◽

The possibilities of applications of vibrational spectroscopy techniques (Raman spectroscopy) in the analysis and characterization of polymers are more and more used and accurate. In this paper, our purpose is to characterize Low Density Poly(Ethylene) (LDPE) grades by Raman spectroscopy and in particular with CH2 Raman vibration modes. With temperature measurements, we determine different amorphous and crystalline Raman assignments. From these results and on the basis of the evolution of CH2 bending Raman vibration modes, we develop a phenomenological model in correlation with Differential Scanning Calorimetry and in particular with crystalline lamella thickness determination.