Improving the crystallization and fire resistance of poly(lactic acid) with nano-ZIF-8@GO

Zhang, Mi; Shi, Xiaowei; Dai, Xiu; Huo, Changan; Xie, Jiong; Li, Xu; Wang, Xinlong

doi:10.1007/s10853-018-2049-2

Cited by 39 publications

(17 citation statements)

References 47 publications

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“…Therefore, commercial PLA's are semicrystalline with melting temperature, T m , between 140 and 180 • C in dependence on the enantiomeric purity (Fambri and Migliaresi, 2010) and glass transition temperature, T g , which usually ranges from 55 to 65 • C (Auras et al, 2004;Krishnan et al, 2016). However, the rate of the PLA crystallization is slow (Auras et al, 2004;Liu et al, 2014;Murariu et al, 2015;Zhang et al, 2018), frequently slower than the cooling rate used in common polymer processing devices (Zhang et al, 2018). Consequently, the crystallinity of PLA in its blends processed by common procedures tends to be very low, typically lower than 10% (Bai et al, 2012(Bai et al, , 2013Ostafinska et al, 2015Ostafinska et al, , 2017.…”

Section: Introductionmentioning

confidence: 99%

Phase Structure, Compatibility, and Toughness of PLA/PCL Blends: A Review

et al. 2019

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Results of the studies dealing with the toughness of polylactic acid/polycaprolactone (PLA/PCL) blends are analyzed with respect to the PCL particle size, PLA matrix crystallinity, and presence of a compatibilizer. It is shown that a high toughness or even "super-toughness" of PLA/PCL blends without a compatibilizer can be achieved for blends with the proper size of PCL particles. Nevertheless, the window for obtaining the super-tough PLA/PCL blends is quite narrow, as the final impact strength is very sensitive to multiple parameters: namely the blend composition, PLA matrix crystallinity, and PCL particle size. Available literature data suggest that the optimal composition for PLA/PCL blends is around 80/20 (w/w). The PLA/PCL(80/20) blends keep high stiffness of PLA matrix and the concentration of PCL particles is sufficient to achieve high toughness. The PLA/PCL(80/20) blends with low-crystallinity PLA matrix (below ca 10%) exhibit the highest toughness for bigger PCL particles (weight average diameter above 1 µm), while the blends with high-crystallinity PLA matrix (above ca 30%) exhibit the highest toughness for smaller PCL particles (weight average diameter below 0.5 µm). The addition of a compatibilizer may improve the toughness only on condition that it helps to achieve a suitable particle size. The toughness of both non-compatibilized and compatibilized PLA/PCL blends with optimized morphology can be more than 15 times higher in comparison with neat PLA.

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Section: Introductionmentioning

confidence: 99%

Phase Structure, Compatibility, and Toughness of PLA/PCL Blends: A Review

et al. 2019

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“…The glass transition temperature ( T g ), the crystallization peak temperature ( T c ), the melting temperature ( T m ), the melting enthalpy (∆ H m ), the cold‐crystallization enthalpy (∆ H c ), and the crystallinity (χ c ) are shown in Table . The PLA and PLA composites have a similar T g of around 64°C, which indicates that the addition of MoS 2 ‐PDA@Ni(OH) 2 hybrids do not affect the integrity of the PLA structure and the movement of the PLA chains . MoS 2 ‐PDA@Ni(OH) 2 /PLA composites show a lower T c than that of neat PLA according to Table , which is attributed to faster crystallization.…”

Section: Resultsmentioning

confidence: 87%

“…The PLA and PLA composites have a similar T g of around 64°C, which indicates that the addition of MoS 2 -PDA@Ni(OH) 2 hybrids do not affect the integrity of the PLA structure and the movement of the PLA chains. 39 MoS 2 -PDA@Ni(OH) 2 /PLA composites show a lower T c than that of neat PLA according to Table 3, which is attributed to faster crystallization. It also shows that MoS 2 -PDA@Ni(OH) 2 /PLA composites start to crystallize more earlier than neat PLA under nonisothermal states, which manifests that the presence of MoS 2 -PDA@Ni(OH) 2 can act as the nucleating agent on the with neat PLA.…”

Section: Crystallization Of Pla Compositesmentioning

confidence: 94%

Mussel‐inspired decoration of Ni(OH)₂ nanosheets on 2D MoS₂ towards enhancing thermal and flame retardancy properties of poly(lactic acid)

Gao

Wang

Zhou

et al. 2019

Polymers for Advanced Techs

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In the present work, a facile and environmental method was developed to fabricate the novel functionalized MoS2 hybrid. Firstly, MoS2 nanosheets were coated with polydopamine (PDA) through the self‐polymerization of dopamine (MoS2‐PDA) in a buffer solution. Then the decoration of Ni(OH)2 on the MoS2‐PDA was synthesized because of the strong affinity of Ni2+ with hydroxyl groups in PDA. Finally, the as‐synthesized MoS2‐PDA@Ni(OH)2 was introduced into poly(lactic acid) (PLA) matrix to explore flame retardancy, thermal stability, and crystalline property of the composites. As confirmed by X‐ray diffraction (XRD), Fourier‐transform infrared spectrometer (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), the MoS2 nanosheets were dually modified with PDA and Ni(OH)2 without destroying the original structures. The thermal degradation of PLA with MoS2‐PDA@Ni(OH)2 generated a notably higher yield of char. Moreover, the crystallization rate of composites is higher than neat PLA. The cone calorimeter test revealed that the introduction of 3% MoS2‐PDA@Ni(OH)2 resulted in lower Peak Heat Release Rate (PHRR) (decreased by 21.7%). Thus, the research provided an innovative functionalization method for manufacturing PLA composites with high performances.

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“…Their results showed that the addition of ZIF‐8 improved the limited oxygen index (LOI) of ZIF‐8/PLA composites, but it did not reduce the dripping of PLA during combustion. Zhang et al . prepared ZIF‐8@GO/PLA composites, their results showed that the LOI of the composite reached 23.2% and the UL‐94 vertical burning test reached V‐2 rating when 2 wt % ZIF‐8@GO was added into PLA.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect between zeolitic imidazolate framework‐8 and expandable graphite to improve the flame retardancy and smoke suppression of polyurethane elastomer

Wang

Chen

et al. 2019

J of Applied Polymer Sci

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Zeolitic imidazolate framework-8 (ZIF-8) was synthesized at room temperature, and then added with expandable graphite (EG) to polyurethane elastomer (PUE) to study their flame retardancy and smoke suppression of PUE. The results showed that when the total flame retardant was 3 wt % and the ratio of ZIF-8 and EG was 1:3, it had the best effect on the flame retardancy and smoke suppression of PUE. Compared with pure PUE, the peak heat release rate, the total heat release, and the maximum smoke density values of Z1E3 decreased by 83.4, 42.6, and 22.4%, respectively. Moreover, the limited oxygen index value of Z1E3 increased to 30.2% and its UL-94 vertical burning test reached V-1 rating. This was because ZIF-8 synergized with EG to make the intumescent char layer compact, resulting in improved flame retardancy and smoke suppression of PUE. The specific mechanism of flame retardancy and smoke suppression is also discussed in this article.

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Improving the crystallization and fire resistance of poly(lactic acid) with nano-ZIF-8@GO

Cited by 39 publications

References 47 publications

Phase Structure, Compatibility, and Toughness of PLA/PCL Blends: A Review

Phase Structure, Compatibility, and Toughness of PLA/PCL Blends: A Review

Mussel‐inspired decoration of Ni(OH)₂ nanosheets on 2D MoS₂ towards enhancing thermal and flame retardancy properties of poly(lactic acid)

Synergistic effect between zeolitic imidazolate framework‐8 and expandable graphite to improve the flame retardancy and smoke suppression of polyurethane elastomer

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Improving the crystallization and fire resistance of poly(lactic acid) with nano-ZIF-8@GO

Cited by 39 publications

References 47 publications

Phase Structure, Compatibility, and Toughness of PLA/PCL Blends: A Review

Phase Structure, Compatibility, and Toughness of PLA/PCL Blends: A Review

Mussel‐inspired decoration of Ni(OH)2 nanosheets on 2D MoS2 towards enhancing thermal and flame retardancy properties of poly(lactic acid)

Synergistic effect between zeolitic imidazolate framework‐8 and expandable graphite to improve the flame retardancy and smoke suppression of polyurethane elastomer

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Mussel‐inspired decoration of Ni(OH)₂ nanosheets on 2D MoS₂ towards enhancing thermal and flame retardancy properties of poly(lactic acid)