Flammability, thermal stability, and mechanical properties of ethylene‐propylene‐diene monomer/polypropylene composites filled with intumescent flame retardant and inorganic synergists

2020 ◽  
Vol 138 (13) ◽  
pp. 50116
Author(s):  
Can Chen ◽  
Ying Zhou ◽  
Weidi He ◽  
Chengtao Gao ◽  
Xiaolang Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Flame Retardant ◽  
Intumescent Flame Retardant ◽  
Ethylene Propylene Diene Monomer ◽  
Ethylene Propylene ◽  
Polypropylene Composites

Influence of zinc borate on the flame retardancy and thermal stability of intumescent flame retardant polypropylene composites

2015 ◽  
Vol 115 ◽  
pp. 224-232 ◽  
Author(s):  
Caimin Feng ◽  
Yi Zhang ◽  
Dong Liang ◽  
Siwei Liu ◽  
Zhenguo Chi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
Intumescent Flame Retardant ◽  
Zinc Borate ◽  
Polypropylene Composites ◽  
Thermal Stability Of

Enhancing the physico-mechanical properties of ethylene propylene diene monomer rubber via ץ-radiation in the presence of bi-functional and tri-functional monomers

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Mai M. El-Zayat ◽  
Maysa A. Mohamed ◽  
Eslam Aboelezz
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Irradiation Dose ◽  
Crosslinking Density ◽  
High Dose ◽  
Ethylene Propylene Diene Monomer ◽  
Ethylene Propylene ◽  
Gel Content ◽  
Oil Resistance ◽  
Bifunctional Monomer

Abstract This study, uses two polyfunctional monomers (PFMs) namely ethylene glycol dimethacrylate (EGDMA) as a bifunctional monomer and trimethylolpropane triacrylate (TMPTA) as a trifunctional monomer were used as co-agents in irradiation crosslinking of Ethylene Propylene Diene Monomer Rubber (EPDM). The effect of concentration of each PFM and irradiation dose on the crosslinking density, gel content, swelling behavior in motor and brake oils, in addition to the mechanical and thermal stability properties of EPDM was investigated in detailed. The results showed a remarkable increase in the gel content, crosslinking density and mechanical properties as the concentration of PFMs increased from 1 to 5 phr (parts per hundred parts of rubber). The various blends of EPDM with the trifunctional monomer express the highest gel content and crosslinking density than those with the bifunctional monomer. The addition of 5 phr of TMPTA to EPDM causes a dramatic improvement in tensile strength (TS) of the prepared blend reached to 188% compared to neat EPDM at 50 kGy. At the same time, the maximum TS of the blend containing 5 phr of EGDMA achieved only 41% compared to neat EPDM at an irradiation dose of 100 kGy. The swelling of irradiated samples in brake oil revealed a stronger oil resistance than motor oil. For all irradiated samples, the oil uptake decreased with the irradiation dose up to 100 kGy. The EPDM samples containing 5 phr of TMPTA recorded the highest oil resistance at 100 kGy. The results also showed that the addition of PFMs and irradiation treatment of the various prepared blends improved the thermal stability of EPDM. Finally, neat EPDM and the blends containing 1 and 3 phr of EGDMA can be used as radiation dosimeters in the very high dose range (50–200 kGy).

Synergistic effects of intumescent flame retardant and nano-CaCO3 on foamability and flame-retardant property of polypropylene composites foams

2017 ◽  
Vol 54 (3) ◽  
pp. 615-631 ◽  
Author(s):  
Li Depeng ◽  
Li Chixiang ◽  
Jiang Xiulei ◽  
Liu Tao ◽  
Zhao Ling
Keyword(s):  
Mechanical Properties ◽  
Stress Concentration ◽  
Flame Retardant ◽  
Synergistic Effects ◽  
Crystallization Rate ◽  
Intumescent Flame Retardant ◽  
Limit Oxygen Index ◽  
Scanning Calorimetry ◽  
Polypropylene Composites ◽  
Flame Retardant Property

Synergistic effects of intumescent flame retardant and nano-CaCO3 on foamability and flame retardant property of polypropylene composites and their foams were carefully investigated. The differential scanning calorimetry results showed that the intumescent flame retardant played a plasticizing effect on the polypropylene/intumescent flame-retardant composites and accelerated the crystallization rate. The rheological properties and supercritical CO2-assisted molding foaming behaviors of the polypropylene/intumescent flame retardant/nano-CaCO3 composites showed that the nano-CaCO3 could enhance their foamability. Scanning electron microscopy pictures and mechanical properties of the polypropylene/intumescent flame-retardant composites foams indicated that the agglomeration of intumescent flame retardant would reduce the cell uniformity and even cause the cell collapse. Furthermore, the stress concentration, caused by the agglomeration, could reduce the mechanical properties of the PP composites foams. The synergistic effect of the nano-CaCO3 could improve the cell uniformity and reduce the stress concentration so that the mechanical properties of the polypropylene/intumescent flame retardant /nano-CaCO3 composites foams were improved. Moreover, the polypropylene/intumescent flame retardant/nano-CaCO3 composites foams had the higher limit oxygen index values than the polypropylene/intumescent flame-retardant foams. TGA results also showed that the nano-CaCO3 could improve the thermal stability of the polypropylene composites foams by forming compact carbon layer. The experimental results indicated that the foamability of the polypropylene composites and the flame-retardant property of their foams could be improved by the synergistic effects of intumescent flame retardant and nano-CaCO3.

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