Kinetic Modeling and Degradation Study of Liquid Polysulfide Resin-Clay Nanocomposite

Shakiba, Mohamadreza; Kakoei, Arash; Jafari, Iman; Ghomi, Erfan Rezvani; Kalaee, Mohammadreza; Zarei, Davood; Abdouss, Majid; Shafiei-Navid, Saeid; Khosravi, Fatemeh; Ramakrishna, Seeram

doi:10.3390/molecules26030635

Cited by 13 publications

(6 citation statements)

References 32 publications

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“…Nylons are also categorized as semi‐crystalline polymers encompassing both crystalline and amorphous phases when solidified from a melt 8 . The degree of crystallinity is inversely proportional to the toughness, flexibility, and color of the material and can be controlled by adjusting the cooling rate 41–43 . Nylons are also known to be water absorbent (<4.5), 1 ultraviolet radiations (UV) resistant, and chemical resistant against most dilute acidic and alkaline mediums 4 .…”

Section: Nylon Propertiesmentioning

confidence: 99%

Nylon—A material introduction and overview for biomedical applications

Shakiba

Ghomi

Khosravi

et al. 2021

Polymers for Advanced Techs

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117

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Nylon is a human‐made material and has been applied in many industrial fields. This literature review explores the use of nylon in biomedical applications and discusses the properties and three‐dimensional (3D) printability of this material. Nylon is studied due to its versatility as an engineering plastic that can be easily transformed into fibers, films, and molded parts. Due to nylon's biocompatible nature, it has desirable chemical stability and tunable mechanical properties making this material and its derivatives widely used as sutures, catheters, dentures, and so on. However, the interactions between nylon and human body tissues have yet to be fully understood. Nevertheless, nylon is hybridized with different materials and used as skin dressings. In recent years, nylon composites have been actively researched in tissue engineering as an alternative to metallic implants with an appropriate bioactivity potential for bone growth. As nylon is supposed to be in contact with the tissue for a long time, hence researchers are developing antimicrobial strategies for the nylon materials to even promote their potential a step further. The 3D printing of nylon is currently confined to specific applications due to the printing technology's current limitations.

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Section: Nylon Propertiesmentioning

confidence: 99%

Nylon—A material introduction and overview for biomedical applications

Shakiba

Ghomi

Khosravi

et al. 2021

Polymers for Advanced Techs

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117

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“…In general, it can be observed from Table 2 and Figure 5 that the inhibitory effect of graphene increases the thermal stability of the final nanocomposites. The thermal stability of the samples with graphene incorporation is due to the proper interaction between the graphene and the UHMWPE matrix, the shielding effect of the charred polymer on the surface, as well as the high thermal stability of graphene [26].…”

Section: Thermal Degradation Studiesmentioning

confidence: 99%

Thermal Degradation Kinetics and Modeling Study of Ultra High Molecular Weight Polyethylene (UHMWP)/Graphene Nanocomposite

et al. 2021

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The incorporation of nanofillers such as graphene into polymers has shown significant improvements in mechanical characteristics, thermal stability, and conductivity of resulting polymeric nanocomposites. To this aim, the influence of incorporation of graphene nanosheets into ultra-high molecular weight polyethylene (UHMWPE) on the thermal behavior and degradation kinetics of UHMWPE/graphene nanocomposites was investigated. Scanning electron microscopy (SEM) analysis revealed that graphene nanosheets were uniformly spread throughout the UHMWPE’s molecular chains. X-Ray Diffraction (XRD) data posited that the morphology of dispersed graphene sheets in UHMWPE was exfoliated. Non-isothermal differential scanning calorimetry (DSC) studies identified a more pronounced increase in melting temperatures and latent heat of fusions in nanocomposites compared to UHMWPE at lower concentrations of graphene. Thermogravimetric analysis (TGA) and derivative thermogravimetric (DTG) revealed that UHMWPE’s thermal stability has been improved via incorporating graphene nanosheets. Further, degradation kinetics of neat polymer and nanocomposites have been modeled using equations such as Friedman, Ozawa–Flynn–Wall (OFW), Kissinger, and Augis and Bennett’s. The "Model-Fitting Method” showed that the auto-catalytic nth-order mechanism provided a highly consistent and appropriate fit to describe the degradation mechanism of UHMWPE and its graphene nanocomposites. In addition, the calculated activation energy (Ea) of thermal degradation was enhanced by an increase in graphene concentration up to 2.1 wt.%, followed by a decrease in higher graphene content.

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“…The degradation process is caused in polymers when a change in their physical and/or chemical properties occurs [19]. Physical changes include reducing the molecular weight, tensile strength, elongation at break and teardrop in the level of transparency [20,21].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Poly (Ethylene glycol) Emulation on the Degradation of PLA/Starch Composites

et al. 2021

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As a hydrophilic renewable polymer, starch has been widely used in biocompatible plastics as a filler for more than two decades. The present study aimed at investigating the effects of polyethylene glycol (PEG), as a plasticizer, on the physicochemical properties of a hybrid composite—polylactic acid (PLA) and thermoplastic starch (TPS). A solvent evaporation process was adopted to gelatinize the starch and disparate PEG contents ranging from 3 to 15 wt.% (with respect to the sample weight) were examined. It was revealed that the increase in the PEG content was accompanied by an increment in the starch gelatinization degree. Referring to the microstructural analyses, the TPS/PLA mixture yielded a ductile hybrid composite with a fine morphology and a uniform phase. Nevertheless, two different solvents, including acetone and ethanol, were used to assess if they had any effect on the hybrid’s morphology, tensile strength and thermal properties. It was found that ethanol culminated in a porous hybrid composite with a finer morphology and better starch distribution in the PLA structure than acetone. As the result of PEG addition to the composite, the crystallinity and tensile strength were decreased, whereas the elongation increased. The hydrolytic degradation of samples was assessed under different pH and thermal conditions. Moreover, the microbial degradation of the PLA/TPS hybrid composite containing different PEG molar fractions was investigated in the soil for 45 days. The rate of degradation in both hydrolytic and biodegradation increased in the samples with a higher amount of PEG with ethanol solvent.

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Kinetic Modeling and Degradation Study of Liquid Polysulfide Resin-Clay Nanocomposite

Cited by 13 publications

References 32 publications

Nylon—A material introduction and overview for biomedical applications

Nylon—A material introduction and overview for biomedical applications

Thermal Degradation Kinetics and Modeling Study of Ultra High Molecular Weight Polyethylene (UHMWP)/Graphene Nanocomposite

The Effect of Poly (Ethylene glycol) Emulation on the Degradation of PLA/Starch Composites

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