Improving the stability and ductility of polylactic acid <i>via</i> phosphite functional polysilsesquioxane

Luo, Ji; Meng, Xin; Gong, Weiguang; Jiang, Zewen; Xin, Zhong

doi:10.1039/c9ra03147b

Cited by 18 publications

(11 citation statements)

References 55 publications

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“…However, due to easy combustibility of PLA, its applications have been restricted in electronic appliances, automobiles, and airplanes 4,5 . Hence, it is of much importance to enhance the thermal stability and flame retardancy of PLA 6‐8 …”

Section: Introductionmentioning

confidence: 99%

Effect of nickel phytate on flame retardancy of intumescent flame retardant polylactic acid

Gong

Fan

Luo

et al. 2020

Polymers for Advanced Techs

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Biodegradable polymers with flame retardancy have aroused great interest in the fabrication of biobased flame retardants. In this study, nickel phytate (PA‐Ni) was prepared by reaction of phytic acid from plant seeds with nickel acetate in water and then used as flame retardant added into polylactic acid (PLA) with intumescent flame retardant (IFR). With the loading of 4 wt% PA‐Ni and 11 wt% IFR, the resulted PLA composite can achieve a UL94 V‐0 test rating. The results show that the pHRR of PLA/11IFR/4PA‐Ni decreases by 62.3% compared with that of virgin PLA and residual char increases significantly. The flame retardant mechanism was analyzed by scanning electron microscopy–energy‐dispersive x‐ray spectroscopy and thermogravimetric analysis coupled to Fourier transform infrared spectroscopy. It is showed that PA‐Ni can improve the formation of continuous and compact char residues, and phosphorus‐containing compounds can act as a radical scavenger to quench free radicals generated during combustion, suggesting that gas‐phase flame retarded mechanism coexists with condensing phase flame retarded mechanism.

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Section: Introductionmentioning

confidence: 99%

Effect of nickel phytate on flame retardancy of intumescent flame retardant polylactic acid

Gong

Fan

Luo

et al. 2020

Polymers for Advanced Techs

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“…Among those, PLA has the potential to be the most commercially available biodegradable plastic derived from biomass with good mechanical properties, 1,2 easy processability, 1 and transparency 3,4 . However, its applications are limited owing to its brittleness, 1,2,5 poor thermal stability, 6 and high cost when compared with conventional plastics.…”

Section: Introductionmentioning

confidence: 99%

Compatibility improvement of poly(lactic acid)/thermoplastic starch blown films using acetylated starch

Noivoil

Yoksan

2020

J of Applied Polymer Sci

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The present research aims to improve the compatibility between relatively hydrophobic poly(lactic acid) (PLA) and hydrophilic thermoplastic starch (TPS) and the properties of the PLA/TPS blends by replacing TPS from native cassava starch (TPSN) with TPS from acetylated starch (TPSA). The effects of the degree of acetylation (DA) of acetylated starch, that is, 0.021, 0.031, and 0.074, on the morphological characteristics and properties of PLA/TPS blend are investigated. The melt blends of PLA and TPS with a weight proportion of PLA:TPS of 50:50 are fabricated and then blown into films. Scanning electron microscopy confirms the dispersion of TPS phase in the PLA matrix. Better dispersion and smaller size of the TPS phase are observed for the PLA/TPSA blend films with low DA of acetylated starch, resulting in improved tensile and barrier properties and increased storage modulus, thermal stability, and Tg, Tcc, and Tm of PLA. Elongation at break of the PLA/TPSA blend increases up to 57%, whereas its water vapor permeability and oxygen permeability decrease about 15%. The obtained PLA/TPSA blend films have the potential to be applied as biodegradable flexible packaging.

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“…Although adding toughening agent and natural fiber can improve the mechanical properties, the addition of flammable components will raise the concern of the flame retardant properties. Recently, a new method of construction of cross-linked structure in flame-retardant PLA was developed to improve the mechanical properties without affecting its flame retardant properties [43][44][45][46][47][48]. The preparation method is simple, and the PLA material can be endowed with good mechanical properties with low amount of cross-linked component.…”

Section: Introductionmentioning

confidence: 99%

Mechanically Robust and Flame-Retardant Polylactide Composites Based on In Situ Formation of Crosslinked Network Structure by DCP and TAIC

Chen

et al. 2022

Polymers

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The addition of intumescent flame retardant to PLA can greatly improve the flame retardancy of the material and inhibit the dripping, but the major drawback is the adverse impact of the mechanical properties of the material. In this study, we found that the flame retardant and mechanical properties of the materials can be improved simultaneously by constructing a cross-linked structure. Firstly, a cross-linking flame-retardant PLA structure was designed by adding 0.9 wt% DCP and 0.3 wt% TAIC. After that, different characterization methods including torque, melt flow rate, molecular weight and gel content were used to clarify the formation of crosslinking structures. Results showed that the torque of 0.9DCP/0.3TAIC/FRPLA increased by 307% and the melt flow rate decreased by 77.8%. The gel content of 0.9DCP/0.3TAIC/FRPLA was 30.8%, indicating the formation of cross-linked structures. Then, the mechanical properties and flame retardant performance were studied. Results showed that, compared with FRPLA, the tensile strength, elongation at break and impact strength of 0.9DCP/0.3TAIC/FRPLA increased by 34.8%, 82.6% and 42.9%, respectively. The flame retardancy test results showed that 0.9DCP/0.3TAIC/FRPLA had a very high LOI (the limiting oxygen index) value of 39.2% and passed the UL94 V-0 level without dripping. Finally, the crosslinking reaction mechanism, flame retardant mechanism and the reasons for the improvement of mechanical properties were studied and described.

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Improving the stability and ductility of polylactic acid via phosphite functional polysilsesquioxane

Abstract: Improving the stability and ductility of polylactic acid via phosphite functional polysilsesquioxane.

Cited by 18 publications

References 55 publications

Effect of nickel phytate on flame retardancy of intumescent flame retardant polylactic acid

Effect of nickel phytate on flame retardancy of intumescent flame retardant polylactic acid

Compatibility improvement of poly(lactic acid)/thermoplastic starch blown films using acetylated starch

Mechanically Robust and Flame-Retardant Polylactide Composites Based on In Situ Formation of Crosslinked Network Structure by DCP and TAIC

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