Construction of crosslinking network structures by adding<scp>ZnO</scp>and<scp>ADR</scp>in intumescent flame retardant<scp>PLA</scp>composites

Chen, Yajun; Wu, Xingde; Li, Mengqi; Qian, Lijun; Zhou, Hongfu

doi:10.1002/pat.5505

Cited by 17 publications

(12 citation statements)

References 65 publications

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“…The mechanical properties test results showed that when DCP and TAIC were added at the same time, the mechanical properties improved significantly and were close to that of pure PLA. Compared with the ADR/nano ZnO system [51], the mechanical properties of the two system are similar to those of pure PLA, which means that both crosslinked structures can achieve excellent performance. In addition, the study of Zhang [54] showed that the mechanical properties of PLA composites decreased significantly after the addition of flame retardants.…”

Section: The Mechanical Properties Of Pla and Its Compositesmentioning

confidence: 97%

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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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Section: The Mechanical Properties Of Pla and Its Compositesmentioning

confidence: 97%

“…It was found that the addition of ADR and nano ZnO could balance the mechanical properties and the flame retardant performance of the flame-retardant PLA. We tried to add different synergists to PLA [51,52]. However, nano ZnO is not recommended to be used in biodegradable plastic PLA because it is toxic to organisms.…”

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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“…A vacant aluminum pan was applied as the reference. The crystallinity (χ c ) was calculated by the below formula 1 13,19,22,23,26 :…”

Section: Differential Scanning Calorimetry Analysismentioning

confidence: 99%

“…In a general sense, it is hard for a pristine polyester to meet all requirements of practical applications 3,18 and commonly the desired properties are given by melt blending with other functional fillers 5,[19][20][21][22] or reacting with some active materials, 21,23 making up the respective weakness. With regards to PLA, a large number of studies on improving its properties by various means have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…They found that the physical, mechanical, and anti‐bacterial properties were affected positively by the hybrid nanoparticles with excellent dispersion and the morphology types of the nanoparticles. Qian et al 22 constructed crosslinking network structures by adding ZnO and ADR in intumescent flame retardant PLA (FRPLA) composites, and the thermal stability, flame retardant performance and mechanical properties were studied. It was reported that crosslinking structures were formed due to the catalytic chain scission effect of nano ZnO and chain extension effect of ADR.…”

Section: Introductionmentioning

confidence: 99%

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Roles of physical filling and chemical crosslinking on the physico‐mechanical properties of polylactic acid

Hao¹,

Tian²,

Chen³

et al. 2022

J of Applied Polymer Sci

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Polylactic acid (PLA) modified materials were prepared with physical filling and chemical crosslinking methods by melt extrusion respectively in this work, and the mechanical, rheological, crystalline, and heat resistance properties were investigated. It is found that filling with talc as the nucleating agent enhanced the crystallization capacity of PLA evidently. When 2 wt% talc was added into the PLA matrix, the crystallinity increased to 30.69% from 6.53% for neat PLA, enhancing by more than 3.6 times. Meanwhile heat resistance of talc filled PLA was improved significantly after annealing, increasing the heat deflection temperature from below 55 C for neat PLA to about 130 C for 2 wt % talc filled PLA. Molecular chains entanglement and spatial structures formation due to crosslinking reactions played key roles in tailoring the tensile, rheological properties and melt strengths of PLA materials. The elongation at break of the modified PLA materials increased by 149% and 126% separately after the crosslinking reactions with and without talc. The melt flow index decreased to 1.70 g/10 min after crosslinking from 11.79 g/10 min of neat PLA, indicating that crosslinking reactions exert significant effects on improving melt strength of PLA.

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Construction of a hydrophobicity, phosphorus‐ and nitrogen‐containing layered double hydroxides‐based synergistic effect flame retardant for poly (lactic acid)

Wang,

Gao,

Zhang

et al. 2024

J of Applied Polymer Sci

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In this work, a synergistic effect strategy was explored for fabricating hydrophobicity, phosphorus‐ and nitrogen‐containing layered double hydroxides nanosheets (LDHs) based flame retardant (LDHs‐K@DM). This fabricating process was achieved by amination of the surface of LDHs and, subsequently, interfacial self‐assembly with high P content of diethylenetriaminpenta (methylene‐phosphonic acid) (DTPMP) and high N content of melamine (MEL). The chemical construction and thermal stabilization properties of LDHs‐K@DM were confirmed via different characterization approaches. The results revealed that LDHs‐K@DM was successfully prepared and the surface of LDHs‐K@DM was transformed into hydrophobicity with high water contact angle. Moreover, LDHs‐K@DM had better thermal stability. After that, LDHs‐K@DM was molten compounded with biobased polylactic acid (PLA). It was suggested that LDHs‐K@DM were uniformly dispersed in the PLA matrix and could accelerate the decomposition of PLA to form char residues. Most importantly, the addition of 20 wt% LDHs‐K@DM into PLA can endow the composite to achieve a desirable UL‐94 V‐0 rating and the limiting oxygen index value of 30.9%. Finally, the synergistic effect flame retardant mechanism of LDHs‐K@DM was comprehensively analyzed. This synergistic decorating strategy for preparing LDHs‐K@DM flame retardant is promising for industrial production.

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Construction of crosslinking network structures by addingZnOandADRin intumescent flame retardantPLAcomposites

Cited by 17 publications

References 65 publications

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

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

Roles of physical filling and chemical crosslinking on the physico‐mechanical properties of polylactic acid

Construction of a hydrophobicity, phosphorus‐ and nitrogen‐containing layered double hydroxides‐based synergistic effect flame retardant for poly (lactic acid)

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