Mechanical Properties and Degrading Behaviors of Aluminum Hypophosphite-Poly(Lactic Acid) (PLA) Nanocomposites

Gu, Lin; Qiu, Jianhui; Qiu, Chen; Yao, Youwei; Sakai, Eiichi; Yang, Liting

doi:10.1080/03602559.2018.1466169

Cited by 13 publications

(13 citation statements)

References 47 publications

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“…Investigating the retarded thermal behavior of nanocomposites in this region, one can realize that addition of AHP nanoparticles to the resin decreased the decomposition rate, representing improved thermal resistance in the system, even at very low concentrations (0.1 wt.% of resin). The decreasing trend of initial decomposition temperature (T 5% ) of nanocomposites (Table 5) demonstrates the higher activity of the O=P-O bond compared to the common C-C and C-O bonds in epoxy, which is boosted by increasing the nanoparticle content and leads to significant decline in T 5% (∆T = 20 • C) to 300 • C for the highest loading [46]. In fact, the addition of AHP nanoparticles causes a decrease in the temperature at which the carbon layer forms [47].…”

Section: Thermal Stabilitymentioning

confidence: 99%

Curing Kinetics and Thermal Stability of Epoxy Composites Containing Newly Obtained Nano-Scale Aluminum Hypophosphite (AlPO2)

et al. 2020

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For the first time, nano-scale aluminum hypophosphite (AlPO2) was simply obtained in a two-step milling process and applied in preparation of epoxy nanocomposites varying concentration (0.1, 0.3, and 0.5 wt.% based on resin weight). Studying the cure kinetics and thermal stability of these nanocomposites would pave the way toward the design of high-performance nanocomposites for special applications. Scanning electron microscopy (SEM) and transmittance electron microscopy (TEM) revealed AlPO2 particles having domains less than 60 nm with high potential for agglomeration. Excellent (at heating rate of 5 °C/min) and Good (at heating rates of 10, 15 and 20 °C/min) cure states were detected for nanocomposites under nonisothermal differential scanning calorimetry (DSC). While the dimensionless curing temperature interval (ΔT*) was almost equal for epoxy/AlPO2 nanocomposites, dimensionless heat release (ΔH*) changed by densification of polymeric network. Quantitative cure analysis based on isoconversional Friedman and Kissinger methods gave rise to the kinetic parameters such as activation energy and the order of reaction as well as frequency factor. Variation of glass transition temperature (Tg) was monitored to explain the molecular interaction in the system, where Tg increased from 73.2 °C for neat epoxy to just 79.5 °C for the system containing 0.1 wt.% AlPO2. Moreover, thermogravimetric analysis (TGA) showed that nanocomposites were thermally stable.

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Section: Thermal Stabilitymentioning

confidence: 99%

Curing Kinetics and Thermal Stability of Epoxy Composites Containing Newly Obtained Nano-Scale Aluminum Hypophosphite (AlPO2)

et al. 2020

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“…The thermal degradation kinetics of the BC/PLA system has been studied previously by Qian et al, (2016) [ 9 ], and that of the AHP/PLA system by Gu et al, (2019) [ 4 ]. Liu et al, (2016) [ 10 ] studied the flame-retardant properties of a three-phase system involving PLA, AHP, and powdered siliceous rice husk (SRH); in what is perhaps the closest known facsimile to the three-phase system of PLA/BC/AHP tested here.…”

Section: Introductionmentioning

confidence: 99%

Development of Biodegradable Flame-Retardant Bamboo Charcoal Composites, Part II: Thermal Degradation, Gas Phase, and Elemental Analyses

et al. 2020

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Bamboo charcoal (BC) and aluminum hypophosphite (AHP) singly and in combination were investigated as flame-retardant fillers for polylactic acid (PLA). A set of BC/PLA/AHP composites were prepared by melt-blending and tested for thermal and flame-retardancy properties in Part I. Here, in Part II, the results for differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR), thermogravimetry-Fourier transform infrared spectrometry (TG-FTIR), X-ray diffraction (XRD), and X-ray photoelectron analysis (XPS) are presented. The fillers either singly or together promoted earlier initial thermal degradation of the surface of BC/PLA/AHP composites, with a carbon residue rate up to 40.3%, providing a protective layer of char. Additionally, BC promotes heterogeneous nucleation of PLA, while AHP improves the mechanical properties and machinability. Gaseous combustion products CO, aromatic compounds, and carbonyl groups were significantly suppressed in only the BC-PLA composite, but not pure PLA or the BC/PLA/AHP system. The flame-retardant effects of AHP and BC-AHP co-addition combine effective gas-phase and condensed-phase surface phenomena that provide a heat and oxygen barrier, protecting the inner matrix. While it generated much CO2 and smoke during combustion, it is not yet clear whether BC addition on its own contributes any significant gas phase protection for PLA.

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“…The reducing trend of onset and endset temperature of epoxy hybrid composites (Table 2) established the higher action of the O P O bonding compared with C O and C C networks in an epoxy polymer and tended to a considerable reduction to 393 and 398 C for CFE, and CTE composites, respectively. [78] In principle, the incorporation of fly ash and TiC nanofillers produces a decrement in the temperature that the carbon layer creates. [79] Furthermore, this influence is decreased in the CFTE hybrid composite because of the lower quantity of phosphorous, including materials.…”

Section: Tga and Dtg Curvesmentioning

confidence: 99%

Effect of coir fiber and inorganic filler on physical and mechanical properties of epoxy based hybrid composites

Kavya

Bavan

Yogesha³

et al. 2021

Polymer Composites

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The present work's target is to study the impact of fly ash or TiC nanoparticles or both on the characteristics of coir fiber epoxy hybrid composites. Mechanical characteristics like tensile, flexural, inter-laminar shear strength, impact strength, shore D hardness, and thermal stability or degradation characteristics were determined. The microstructure of the samples was observed from a scanning electron microscopy. It was observed that the addition of coir fiber, fly ash, and TiC nanoparticles in the epoxy polymer enhanced the mechanical and thermal characteristics of composites. It can be assigned to the better interaction and uniform distribution between the fillers and the epoxy polymer. Fillers acted a critical role in enhancing the characteristics of epoxy hybrid composites. Additionally, water absorption characteristics were also investigated for all specimens. A comparative examination was performed between various fabricated composite specimens. Results exhibited that, the water absorption of the composites improves considerably with the addition of reinforcements. Also, thermogravimetric analysis exhibited that the fabricated epoxy hybrid composites were stable thermally.

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Mechanical Properties and Degrading Behaviors of Aluminum Hypophosphite-Poly(Lactic Acid) (PLA) Nanocomposites

Cited by 13 publications

References 47 publications

Curing Kinetics and Thermal Stability of Epoxy Composites Containing Newly Obtained Nano-Scale Aluminum Hypophosphite (AlPO2)

Curing Kinetics and Thermal Stability of Epoxy Composites Containing Newly Obtained Nano-Scale Aluminum Hypophosphite (AlPO2)

Development of Biodegradable Flame-Retardant Bamboo Charcoal Composites, Part II: Thermal Degradation, Gas Phase, and Elemental Analyses

Effect of coir fiber and inorganic filler on physical and mechanical properties of epoxy based hybrid composites

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