Strengthening, toughing and thermally stable ultra-thin MXene nanosheets/polypropylene nanocomposites via nanoconfinement

Shi, Yongqian; Liu, Chuan; Liu, Lu; Fu, Libu; Yu, Bin; Lv, Yuancai; Yang, Fuqiang; Song, Pingan

doi:10.1016/j.cej.2019.122267

Cited by 199 publications

(81 citation statements)

References 59 publications

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“…But the T cc and T m of PLA‐7 shift to lower temperature than pure PLA. It is attributed to the small molecule DOPO will change to liquid state and plasticize the amorphous phase of PLA, meanwhile MPP serves as a nucleating agent in PLA matrix …”

Section: Resultsmentioning

confidence: 99%

Synergistic effect of flame retardants and graphitic carbon nitride on flame retardancy of polylactide composites

Cao

Chi

Deng

et al. 2020

Polymers for Advanced Techs

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In order to improve the flame retardant of polylactide (PLA), the synergistic effect of graphitic carbon nitride (g-C 3 N 4 ) with commercial-available flame retardants melamine pyrophosphate (MPP) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) was investigated. The PLA composites containing 5 wt% g-C 3 N 4 and 10 wt% DOPO had a highest limited oxygen index (LOI) value of 29.5% and reached the V-0 rating of UL-94 test. The cone calorimeter tests exhibited that DOPO had a better synergistic effect with g-C 3 N 4 than MPP to improve flame retardancy of PLA. The peak heat release rate (pHRR) and total heat release (THR) of PLA composites containing 10 wt% DOPO could be reduced by 25.2% and 23.6%, respectively, as compared with those of pure PLA. The presence of rich phosphorus element and aromatic groups in DOPO contributed to obtain continuous compact char layer and increase the graphitization level of char residues, thereby, resulting in improving the flame retardancy of PLA together with g-C 3 N 4 . In addition, the incorporation of DOPO can serve as a plasticizer to reduce the complex viscosity, improving the processability of PLA composites. K E Y W O R D S flame retardancy, graphitic carbon nitride, polylactide 1 | INTRODUCTION Bio-based and biodegradable polymers have received considerable attention during the last decade due to the growing environmental pollution and the shortage of petroleum resources. Polylactide (PLA),one of the commercial biodegradable polyesters, exhibits superior mechanical property, biodegradability, and easy processability. 1,2 It has a variety of potential applications, such as packaging, fishery, electronics, and automobile components. 3-5 However, the intrinsic poor thermal resistance and high combustibility of PLA restrict its further applications. To address the aforementioned challenges, many researches have demonstrated that the incorporation of twodimensional nanofiller is a simple and effective way to enhance thermal stability and flame retardant performance of PLA. It is widely acknowledged that the combination of the dispersed two-dimensional nanofiller with additive-type flame retardants can dramatically inhibit the oxidation reactions and/or pyrolytic reactions during the combustion. Tawaih et al reported that the peak heat release rate (pHRR) and total heat release (THR) of PLA composites could be reduced by 76.5% and 76.9%, respectively, with 2 wt% of sodium metaborate

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Section: Resultsmentioning

confidence: 99%

Synergistic effect of flame retardants and graphitic carbon nitride on flame retardancy of polylactide composites

Cao

Chi

Deng

et al. 2020

Polymers for Advanced Techs

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“…The thermal stability of polymeric materials was investigated by the TG technique [ 38 , 39 ]. The TG and differential thermogravimetry (DTG) curves of RPUF and its composites are portrayed in Figure 1 , and the related thermal data are recorded in Table 1 .…”

Section: Resultsmentioning

confidence: 99%

“…Thermogravimetric analysis (TGA) was performed using a Q5000 analyzer (TA Co., New Castle, DE, USA) [ 38 ]. The RPUF samples were heated from room temperature to 800 °C at a linear heating of 20 °C min −1 in ambient air.…”

Section: Methodsmentioning

confidence: 99%

Enhanced Fire Safety of Rigid Polyurethane Foam via Synergistic Effect of Phosphorus/Nitrogen Compounds and Expandable Graphite

et al. 2020

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In order to explore highly efficient flame-retardant rigid polyurethane foam (RPUF), phosphorus/nitrogen compounds and expandable graphite (EG) were successfully incorporated into RPUF by a free one-spot method. The combustion results showed that the fire safety of the RPUF samples was remarkably improved by the addition of phosphoric/nitrogen compounds and EG. With the incorporation of 22.4 wt.% phosphorus/nitrogen compounds and 3.2 wt.% EG, the RPUF composites achieved UL-94 V-0 rating. Besides, the total heat release and total smoke release of RPUF composites were reduced by 29.6% and 32.4% respectively, compared to those of the pure RPUF sample. PO• and PO2• together with nonflammable gaseous products were evolved from phosphoric/nitrogen compounds in the gas phase, which quenched the flammable free radicals in the matrix and diluted the concentration of combustible gaseous products generated from PRUF during combustion. The compact char residues which acted as excellent physical barriers were formed by catalysis of EG and phosphoric/nitrogen compounds in the condense phase. The fire hazard of RPUF was significantly reduced by the synergistic effect of phosphorus-nitrogen compounds and EG. This work provides a promising strategy to enhance the fire safety of RPUF.

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“…Therefore, the research boom of 2-D layered nanomaterials with similar structures with graphene has been rising in recent years. Some studies have shown that 2-D layered materials (e.g., MoS 2 , GO) can improve the thermal stability and flame retardancy of polymer materials (Huang et al, 2012 ; Liao et al, 2012 ; Maddalena et al, 2018 ; Shi et al, 2019 , 2020 ). The improvement of thermal stability and flame retardant is mainly due to the blocking effect of 2-D layered structure, which can effectively prevent the volatilization of combustible gas and oxygen diffusion, and delay mass loss.…”

Section: Introductionmentioning

confidence: 99%

Polydopamine-Bridged Synthesis of Ternary h-BN@PDA@TiO2 as Nanoenhancers for Thermal Conductivity and Flame Retardant of Polyvinyl Alcohol

Wang

2020

Front. Chem.

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In this study, h-BN@PDA@TiO 2 hybrid nanoparticles were prepared and used as functional fillers to prepare PVA nanocomposites, and the effects of hybrid particles on PVA thermal conductivity and flame retardant properties were studied. The results showed that hybrid particles could significantly improve the thermal conductivity and flame retardant performance of PVA composites, and effectively inhibit the release of toxic gases such as combustible pyrolysis products and CO, which enhanced the fire safety of PVA composites. When the addition amount of hybrid particles is 5 wt%, the thermal conductivity of PVA composites is 239.1% higher than that of the pure PVA and the corresponding temperature of PVA composites with a mass loss of 5 wt% was 16.2°C higher than that of the pure PVA. This is due to the barrier effect of h-BN and the protective effect of dense carbon layer catalyzed by TiO 2 .

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Strengthening, toughing and thermally stable ultra-thin MXene nanosheets/polypropylene nanocomposites via nanoconfinement

Cited by 199 publications

References 59 publications

Synergistic effect of flame retardants and graphitic carbon nitride on flame retardancy of polylactide composites

Synergistic effect of flame retardants and graphitic carbon nitride on flame retardancy of polylactide composites

Enhanced Fire Safety of Rigid Polyurethane Foam via Synergistic Effect of Phosphorus/Nitrogen Compounds and Expandable Graphite

Polydopamine-Bridged Synthesis of Ternary h-BN@PDA@TiO2 as Nanoenhancers for Thermal Conductivity and Flame Retardant of Polyvinyl Alcohol

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