Flame Retardancy Properties and Rheological Behavior of PP/DiDOPO Conjugated Flame Retardant Composites

Zhang, Daohai; Shang, Xiaoyu; Luo, Jiyong; Sun, Junzhuo; Tan, Fang; Bao, Dongmei; Qin, Shuhao

doi:10.3389/fchem.2022.933716

Cited by 4 publications

(4 citation statements)

References 19 publications

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“…When the content of DiDOPO in conjugated structure was 16 wt %, the LOI value of polypropylene composites was 24%, reaching V-0 grade, and the composites might have low conductivity and charge mobility. In addition, according to the data provided in this paper, the FRI value at this time was 0.80 . Yang et al synthesized the multifunctional flame retardant EAD with a conjugated structure by an addition reaction of P–H of DOPO and the alkynyl group of 4-ethynylaniline (EA).…”

Section: Introductionmentioning

confidence: 89%

“…In addition, according to the data provided in this paper, the FRI value at this time was 0.80. 26 Yang et al synthesized the multifunctional flame retardant EAD with a conjugated structure by an addition reaction of P–H of DOPO and the alkynyl group of 4-ethynylaniline (EA). When 2 wt % EAD was added to the epoxy resin, the phosphorus loading was only 0.186 wt %, which could effectively improve the flame retardancy of the epoxy resin and LOI increased by 31% and UL-94 reached V-0 grade.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of High-Molecular-Weight Bifunctional Additives with both Flame Retardant Properties and Antistatic Properties via ATRP

et al. 2022

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Polystyrene (PS) is widely used in our daily life, but it is flammable and produces a large number of toxic gases and hightemperature flue gases in the combustion process, which limit its application. Improving the flame retardancy of PS has become an urgent problem to be solved. In addition, in view of the disadvantage that small-molecule flame retardants can easily migrate from polymers during use, which leads to the gradual reduction of the flame retardant effect or even loss of flame retardant performance, and the outstanding advantages of ATRP technology in polymer structure design and function customization, we used ATRP technology to synthesize the high-molecular-weight bifunctional additive PFAA-DOPO-b-PDEAEMA, which has flame retardant properties and antistatic properties. The chemical structure and molecular weight of PFAA-DOPO-b-PDEAEMA were characterized by FTIR, 1 H NMR, GPC, and XPS. When the addition of PFAA-DOPO-b-PDEAEMA was 15 wt %, the limiting oxygen index (LOI) of polystyrene composites was 28.4%, which was 53.51% higher than that of pure polystyrene, the peak of the heat release rate (pHRR) was 37.61% lower than that of pure polystyrene, UL-94 reached V-0 grade, and the flame retardant index (FRI) was 2.98. In addition, when the PFAA-DOPO-b-PDEEMA content is 15 wt %, the surface resistivity and volume resistivity of polystyrene composites are 2 orders of magnitude lower than those of polystyrene. This research work provides a reference for the design of bifunctional and even multifunctional polymers.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Synthesis of High-Molecular-Weight Bifunctional Additives with both Flame Retardant Properties and Antistatic Properties via ATRP

et al. 2022

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“…Phosphorus is an effective flame-retardant element, and phosphorus-based flame retardants can thermally decompose and release phosphorus-containing reactive radicals (e.g., PO2-, PO-, and HPO-, etc.) in the gas phase when used ( Zhang et al, 2022a ; Zhang et al, 2022b ). The average reactivity of these radicals is 10 times that of Cl- and 5 times that of Br-, which can effectively trap hydroxyl and hydrogen radicals, terminate the radical segment, and prevent further thermal decomposition of polyester materials.…”

Section: Introductionmentioning

confidence: 99%

Flame-retardant properties and mechanism of LGF/PBT/DOPO-HQ-conjugated flame-retardant composites

Sun

Zhang²,

Shang³

et al. 2022

Front. Chem.

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In this article, long fiber reinforced polybutylene terephthalate (LGF/PBT/DOPO-HQ) flame-retardant composites were prepared using 10-(2,5-dihydroxy phenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO-HQ) as the conjugated flame-retardant. The effects of different flame-retardant contents on the combustion properties of the composites were investigated. The results showed that after adding 14% of DOPO-HQ, the flame-retardant effect of the composite reached the V-0 level of UL-94 fire rating with an ultimate oxygen index (LOI) of 26.4%. The average heat release rate (Av-HRR), peak heat release rate (PHRR), and total heat release rate (THR) decreased by 45.9, 56.5, and 32.6%, respectively. This shows that LGF/PBT/DOPO-HQ composite has good flame-retardant properties. Meanwhile, the flame-retardant mechanism of cohesive phase and gas-phase synergy during the combustion of flame retardants was analyzed by carbon layer morphology and dynamic thermal decomposition.

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“…In recent years, phosphorous-containing compounds have attracted wide attention for being halogen-free and having high efficiency in the fire protection of polymers, such as 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and its derivatives (Perez et al, 2006;Zhang et al, 2011;Zhang et al, 2022a;Zhang et al, 2022b), hypophosphite (Ge et al, 2015), metal phosphinate (Zhao et al, 2013;He et al, 2020), etc., (Si et al, 2014). Among these flame retardants, the most important and efficient flame retardants are metal phosphinates, which can play their main role in gas phase by releasing PO•free radical scavenger and also catalyze the charring in the condensed phase.…”

Section: Introductionmentioning

confidence: 99%

Thermal degradation behavior and flame retardant properties of PET/DiDOPO conjugated flame retardant composites*

Xiang

Gao

et al. 2022

Front. Chem.

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PET/DIDOPO conjugated flame retardant composites were prepared by melt blending of styrene bridged DOPO (DIDOPO) into polyethylene terephthalate (PET). The flame retardancy, rheological behavior, and thermal degradation behavior of the composite were characterized by vertical combustion test (UL-94), limit oxygen index test (LOI), rotational rheometer, and thermogravimetry (TG). The results showed that the flame retardant composite with V-0 grade was obtained when the amount of DIDOPO is 12.5wt%, and the corresponding LOI value was 56.87% higher than that of PET. The thermogravimetry-fourier infrared spectroscopy (TG-FTIR) test results showed that DIDOPO could promote the degradation of PET/DIDOPO materials, and release phosphorus-containing free radicals to quench the flame, therefore slowing down the combustion process, and mainly playing the key flame retardant role in gas-phase.

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Flame Retardancy Properties and Rheological Behavior of PP/DiDOPO Conjugated Flame Retardant Composites

Cited by 4 publications

References 19 publications

Synthesis of High-Molecular-Weight Bifunctional Additives with both Flame Retardant Properties and Antistatic Properties via ATRP

Synthesis of High-Molecular-Weight Bifunctional Additives with both Flame Retardant Properties and Antistatic Properties via ATRP

Flame-retardant properties and mechanism of LGF/PBT/DOPO-HQ-conjugated flame-retardant composites

Thermal degradation behavior and flame retardant properties of PET/DiDOPO conjugated flame retardant composites*

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