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 13 publications

(12 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

See 1 more Smart Citation

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…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%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Solid‐state NMR characterization of multi‐component intumescent flame retardant polybutylene succinate formulations

Xiao

Fontaine

et al. 2022

Polymers for Advanced Techs

View full text Add to dashboard Cite

In this work, a series of multi‐component intumescent PBS formulations were elaborated by the combination of intumescent flame retardant (IFR) system (consisting of ethylenediamine phosphate and melamine poly(aluminum phosphate), 7:3, wt:wt) and synergists. Three boron/zinc‐containing compounds (i.e., melamine borate, zinc oxide, zinc carbonate) were examined as potential synergists to improve the fire behavior and fire retardancy of PBS. The MLC results showed that the incorporation of all of these compounds enhanced the fire retardancy of PBS to some extent. Among them, zinc oxide exhibited the best fire retardant performances in terms of reduction of the peak heat release rate (pHRR, −61%), fire growth rate index (FIGRA, −19%), maximum average rate of heat emission (MARHE, −55%), and increase of the time to pHRR (+370 s) and to flameout (+650 s) as compared to PBS/IFR10%. Furthermore, the effect of zinc oxide loading on the fire retardancy of PBS was also investigated, the results showed that 2 wt.% loading exhibited the best performances. Solid‐state NMR characterization indicated that the presence of ZnO resulted in the formation of a crack‐free and dense intumescent char layer reinforced by complex aluminum‐zinc‐phosphates glassy species. The intumescent char layer provided a protective physical barrier with improved flexibility and cohesion, which effectively limits the heat and mass transfer between condensed and gas phases and hence, improving the fire retardancy of PBS.

show abstract

Construction of crosslinking network structures by addingZnOandADRin intumescent flame retardantPLAcomposites

Cited by 13 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

Solid‐state NMR characterization of multi‐component intumescent flame retardant polybutylene succinate formulations

Contact Info

Product

Resources

About