scholarly journals Use of Phosphorylated Chitosan/Alumina Nanoadditives for Polymer Performance Improvement.

2022 ◽  
Author(s):  
Mehdi Hatami ◽  
Nima Rahnama ◽  
Hassan Karimi-Maleh ◽  
Nader Djafarzadeh ◽  
Mohammad Qandalee ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Flame Retardant ◽  
Alumina Nanoparticles ◽  
Elemental Phosphorus ◽  
Scanning Calorimetry ◽  
Poly Ethylene Terephthalate ◽  
Flame Retardant Properties ◽  
Poly Ethylene ◽  
Surface Modified ◽  
New Generation

Abstract In this research, a new generation of ternary nanocomposites based on poly(ethylene terephthalate) (PET), phosphorylated chitosan and surface modified alumina nanoparticles were fabricated in four steps. The phosphorylation process was targeted for the insertion of elemental phosphorus as a flame retardant agent in the final PET nanocomposite. Likewise, environmentally friendly nano-alumina was used for PET matrix to improve the flame retardant properties of PET in collaboration with elemental phosphorus. Alternatively, the presence of alumina nanoparticles in combination with phosphorylated chitosan improved the antibacterial activity of the PET matrix. Furthermore, the effects of the phosphorylated chitosan and alumina nanoparticles on the morphology and thermal properties of nanocomposites were inspected by different approaches. The structure and distribution of the nanoscale particles in PET were analyzed by scanning electron microscopy. In addition, differential scanning calorimetry and thermogravimetric analyses were used for the in-depth evaluation of the thermal properties of prepared nanocomposites.

Thermal Properties of Ester-Type Easy Cationic Dyeable Poly(ethylene Terephthalate) (ECDP) Polymers

2010 ◽  
Vol 44-47 ◽  
pp. 2409-2413 ◽  
Author(s):  
Yu Sun ◽  
Guo Zheng ◽  
Hong Xiang Yang ◽  
Yan Jun Liu ◽  
Xiao Ning Li
Keyword(s):  
Thermal Properties ◽  
Diethylene Glycol ◽  
Ethylene Terephthalate ◽  
Glycol Succinate ◽  
Glycol Adipate ◽  
Scanning Calorimetry ◽  
Poly Ethylene Terephthalate ◽  
Monomer Content ◽  
Diethylene Glycol Succinate ◽  
Poly Ethylene

This study investigated the thermal properties of ester-type easy cationic dyeable poly(ethylene terephthalate) (ECDP) polymers using differential scanning calorimetry (DSC), therogravimetric analysis (TGA). The mass ratios of 5-sodium sulfo bis(-hydroxyethyl) isophthalate(SIPE) for ECDP polymers were 2.8%, 5.5%, 6.8%, respectively. The fourth monomers were diethylene glycol adipate (DGA), diethylene glycol succinate (DGS) and diethylene glycol subacate (DES) with different contents. The results suggested that the Tg of ester-type ECDP decreased with the increasing the molecule weight of the fourth monomer at fixed SIPE and fourth monomer contents. The Tch of ECDP polymer to be lower than that of the CDP polymer with the same SIPE content. And it decreased as SIPE and fourth monomer contents increased, it also decreased with the increasing of the molecule weight of the fourth monomer given the same SIPE content. The effect of the ester-type soft segments reduced the Tm of ECDP. The thermal stability of ECDP polymer was less than PET and CDP polymers, and it decreased with increasing SIPE content, but increased with the ester-type fourth monomer content increasing.

Investigation of Flame Retardant Properties of Poly(ethylene Terephthalate)/Silatrane Complex/Montmorillonite Nanocomposites

2013 ◽  
Vol 747 ◽  
pp. 43-46
Author(s):  
Phawittra Sonsilchai ◽  
Duangdao Aht-Ong
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Ethylene Terephthalate ◽  
Synergistic Effects ◽  
One Pot ◽  
Poly Ethylene Terephthalate ◽  
Twin Screw ◽  
Ft Ir ◽  
Flame Retardant Properties ◽  
Poly Ethylene

Poly (ethylene terephthalate) or PET was used in many applications such as packagings, textiles, electrical devices, and auto parts as well due to its good mechanical properties and dimensional stabilities, etc. However, the main drawback of PET is poor flame retardant and melt-dripping, which needed to be solved. Therefore, the aim of this research was to improve the flame retardant properties of PET by investigating the synergistic effects of flame retardant agents between silatrane complex and montmorillonite (MMT) at various concentrations. Silatrane complex was synthesized from silica through one pot process. The characteristic of the obtained silatrane complex was determined by FT-IR, SEM, and TGA. Various ratios of PET/silatrane complex/MMT nanocomposites were prepared by melt bending using a twin screw extruder and compressed into standard shape according to ASTM standard by a compression molding, respectively. Morphology, flame retardant properties, and mechanical properties of PET nanocomposites were investigated. The flame retardant properties were evaluated by LOI values and UL-94V rating. The results showed that mechanical properties of PET/silatrane complex/MMT nanocomposites were slightly different from those of the neat PET. The flame retardant properties showed that the LOI values of PET/silatrane complex/MMT nanocomposites were greater than that of neat PET and increased with increasing the silatrane complex concentration. The LOI value of PET/7%silatrane/2%MMT nanocomposite was increased up to 60.75%, compared with that of neat PET. While neat PET was classified into V-2 rating since it showed sustainable burning and melt-dripping behavior during burning process, PET/silatrane complex/MMT nanocomposites did not show such behavior and thus could be designated as V-0 rating. In addition, the results indicated that the MMT could occur synergistic effect with silatrane complex as well.

A study on the fracture, mechanical and thermal properties of chain extended recycled poly(ethylene terephthalate)

2015 ◽  
Vol 30 (8) ◽  
pp. 1157-1172 ◽  
Author(s):  
Nevin Gamze Karsli
Keyword(s):  
Thermal Properties ◽  
Ethylene Terephthalate ◽  
Chain Extender ◽  
Mechanical And Thermal Properties ◽  
Ftir Analysis ◽  
Dsc Analysis ◽  
Scanning Calorimetry ◽  
Poly Ethylene Terephthalate ◽  
Impact Modifier ◽  
Poly Ethylene

The aim of this study is to simultaneously improve the mechanical strength and fracture toughness properties of recycled poly(ethylene terephthalate) (r-PET). For this purpose, Joncryl® was used as chain extender and Lotader® was used as impact modifier. The combined effect of chain extender and impact modifier on the chemical, fractural, mechanical, and thermal properties of r-PET was investigated. Fourier transformed infrared spectroscopy (FTIR) analysis, EWF analysis, tensile test, and differential scanning calorimetry (DSC) analysis were performed. FTIR analysis revealed that all the epoxy groups in the Joncryl® were consumed during the compounding. EWF results showed that while toughness of r-PET decreased with the addition of Joncryl®, toughness was increased with addition of impact modifier Lotader®. It was found that 2.5% Lotader® usage at the same time with Joncryl® increased the tensile strength of r-PET as well as toughness. It was observed from DSC analysis that chain extender and impact modifier addition did not change the thermal transition temperatures of r-PET.

scholarly journals Thermal properties of MECDP copolyesters

2012 ◽  
Vol 16 (5) ◽  
pp. 1456-1459 ◽  
Author(s):  
Ming-Liang Zhao ◽  
Yuan Liu ◽  
Fa-Xue Li ◽  
Xue-Li Wang ◽  
Yu Gao ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Thermal Degradation ◽  
Ethylene Glycol ◽  
Poly Ethylene Glycol ◽  
Scanning Calorimetry ◽  
Degradation Temperature ◽  
Poly Ethylene Terephthalate ◽  
Oxygen Condition ◽  
Poly Ethylene ◽  
Temperature Melting

MECDP copolyesters based on poly(ethylene terephthalate) were prepared with sodium-5-sulfo-bis-(hydroxyethyl)-isophthalate and poly(ethylene glycol) units as modifiers. Thermal properties of these copolyesters were characterized by differential scanning calorimetry and thermal gravity analyzer. Experimental results indicated that glass transition temperature, melting temperature and thermal degradation temperature reduced with increasing the poly(ethylene glycol) content. The incorporation of poly(ethylene glycol) increased the flexibility and irregularity of molecular chains which led to lower crystallinity, and bought more ether bonds into molecular chains. Besides, the thermal degradation under oxygen condition happened easily compared to that under nitrogen condition.

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

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 ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

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.

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