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Shi Xian Study 20 | Turkish researchers have discovered that ring-opening metathesis polymerization (ROMP) reactions can be used to prepare phosphorus-containing and phenyl copolymers for flame retardant polypropylene-IFR systems
Professor Guralp Ozkoc of Kocaeli University, Turkey and Professor Tarik Eren of Yaldez University of Technology have prepared new 2-phenyl polymers containing phosphorus or phenyl, 3 phosphate polymers and 2 through ring-opening metathesis polymerization. Phenyl-3 phosphate ester copolymer, which is applied to PP flame retardant, fully utilizes the environmental friendliness of polymerized flame retardants relative to small molecule additives, and is easy to blend with other polymers and its entanglement is not easy to remove from the polymer matrix. Precipitation and other advantages.
Researchers have prepared 2-phenyl polymers, 3 phosphate polymers and 2 phenyl-3 phosphate copolymers through molecular design, ring opening, decomposition, polymerization, etc., while using octaphenyl POSS, Melt blended with ammonium polyphosphate and other PP / intumescent flame retardant (IFR) compounds composed of PP to prepare next-generation polypropylene composites. The core point of this work is to study the effects of phenyl and phosphorus-containing homopolymers and copolymers and octaphenyl POSS on the flame retardant synergy and mechanical properties of PP / IFR blends.
Target monomers are prepared by ordinary solution polymerization, and their homopolymers and copolymers are prepared by free-radical polymerization. A new generation of PP composites is prepared by melt blending the homopolymers and copolymers with the PP / IFR system at a certain ratio.
Structural characterization of small molecules and their homopolymers, copolymers, etc. using FTIR, 1HNMR, etc., demonstrates the successful preparation of expected products. TGA, DSC, UL94, LOI testing, etc. are used to homopolymer, copolymer, and PP composites Characterize thermal and combustion properties.
TGA test shows that the thermal decomposition temperature of 2-phenyl polymer is high, and the residual carbon content is about 15%; the thermal decomposition temperature of 3-phosphate polymer is advanced, and the residual carbon content can reach 40%; 2phenyl-3 phosphate The amount of residual carbon in the copolymer is somewhere in between.
The thermal stability test evaluation of the composite material shows that the thermal decomposition of the composite material is divided into two steps. The introduction of the 2 phenyl-3-phosphate copolymer will advance the first part of the composite material, and the thermal stability of the second phase will be improved. obvious. The former is due to the catalytic decomposition of the phosphoric acid group, and the latter is due to the improvement of the thermal stability of the composite material.
The dynamic mechanical analysis of the composite material after the introduction of the copolymer is shown in Table 2 (V). The storage modulus of the composite material has decreased, which may be due to the internal plasticization of the ester group, but as the temperature increases, High, the difference in storage modulus of PP / IFR and PP / IFR / additive composites becomes smaller.
The UL94 test and LOI test were used to evaluate the combustion performance of the composite material. Pure PP is highly flammable with dripping, and the LOI value is only 18.3%. PP / IFR does not significantly improve the combustion performance, and there are still dripping; PP / IFR / additives When a certain amount is added, the flame retardant grade is improved, and the dripping phenomenon is slowed or disappeared. The LOI value can rise to more than 26%, which indicates that the flame retardant performance of the composite material is improved.
Finally, the researchers explained the flame retardant mechanism of the composite material: the mechanism is mainly the dual effect of the barrier effect of the carbon layer and the free radical trapping effect in the gas phase.
Journal of Applied Polymer Science (Vol. 135, Issue 11, March 15, 2018, 45998 pages)
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