| Poly (aryl ether ketone) compounds, a high-performance semi-crystalline specialengineering plastics, a phenylene connected by phenylene linkages and carbonyl, contains a higherproportion of the benzene ring in the molecular structure and therefore has excellent heatresistance, mechanical properties, flame retardancy and other excellent performances.Because themolecular structure of the flexible ether linkages is more convenient to its thermoplasticmachine-shaping, poly（aryl ether ketone）widely used. But the solubility of polyaryletherketone isnot so perfect, therefore it affects the solution processability of polyaryletherketone. In order toimprove the solubility of poly（aryl ether ketone）, a Phenolphthalein Poly (aryl ether ketone)--PEK-C was synthesized. Because bulky side groups are introducted into polymer chains and theirregularity and crystalline are destroyed. PEK-C hence has a very good solubility, and theimprovement of the production process also greatly reduced the cost of production.Because PEK-C is high temperature resistant, self lubricating, self-lubricating, and has awell excellent mechanical property and processing performance feature, it is widely applied inmany fields. But the fire resistance of PEK-C is worse than the the traditional polypolyaryletherketone. According to reports in the literature, the introduction of phosphorus in thepolymer can effectively improves the fire resistance of polymers. For example, the introductionsof phosphorus in PC、PE、PI and other special engineering plastics all get an well improvement inthe fire resistance. The main purpose of this paper is to improve the fire resistance of PEK-C bytwo different means of the introduction of phosphorus into the polymer, in the meantime,maintaining other excellent performances.Firstly, by means of reactive fire resistance, BFPPO,as the essence of fire retardant, withDifferent number of DFK reacting with phenolphthalein is introduced into the main chain of PEK-C. A series of Blends P9-P1and a PEPPO are composed, and the paper characterizes theirstructures, the basic properties and fire retardance. The phosphorus structure is introduced into thepolymer by infrared spectroscopy and phosphorus magnetic resonance imaging test; X-raydiffraction testing and DSC show that the synthetic polymer are amorphous polymers; In thetensile test, the modulus increases with the increase of the rigid structure of BFPPO contentincreases, while the tensile strength and elongation at break has been reduced; In the tensile test,the modulus increases with the increase of the rigid structure of BFPPO content increases, whilethe tensile strength and elongation at break has been reduced; DSC testing showed that the glasstransition temperature (Tg) of the polymer increases with the increase of BFPPO, which will helpto improve the upper temperature limit of the polymer. The mechanism of phosphorus-containingflame-retardant is explored by the TGA test; the test results show that the introduction ofphosphorus significantly improve the combustion properties of PEK-C copolymers, stillmaintaining a good solubility and light transmittance.Secondly, there is an other approach to improve the flame retardance of polymer materials, aflame retardant is added into flame-retardant materials, doing not occur to any chemical reaction,only on the physical way, which is called additive type flame retardant mean. It is aflame-retardant effect of polymer with another polymer physical blend. The poly (aryl ether)PEPPO synthesised with phosphorus-containing monomer BFPPO is solution blended withdifferent proportions of PEK-C. Then it is processed into films, getting a series of blends filmBP9-BP1. Blend films crystallization is tested of crystallization and light transmittance, thethermal performance characterized by DSC, TGA and DMA test, meanwhile mechanicalproperties, SEM, DSC and DMA tests are taken, which shows that they have poor compatibility.Blending method provides a new way to improve the flame retardancy of the PEK-C. |
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