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New pour point depressants were prepared by making use of the random copolymerization of acrylate monomer. The pour point and cloud point of the synthetic polymers in diesel mixtures containing 5%(BD5) and 20%(BD20) biodiesel were investigated. The characteristics of the synthetic polymers which were random structure of P(St/SMA). P(SMA/St), P(SMA/OMA/St), P(LM/AMA/St), P(LMA/SMA/St) were analyzed by ¹H-NMR and GPC. When the synthetic polymers were added to BD5 and BD20 at the concentration of 5000ppm. The pour point of the terpolymers were -5℃~-10℃ lower than that of the copolymers. In the case of BD5 whose pour point is -12.5℃, the pour point of the existing additives and the P(LMA/SMA/St) polymer additive which showed the lowest pour point among the synthetic polymers were -37.5℃ and -35℃ respectively at the concentration of 5000ppm. The result showed the pour point of the P(LMA/SMA/St) polymer was higher than the existing additives. On the other hand. in the case of BD20 whose pour point is -10℃, the pour points of the existing additives and the P(LMA/OMA/St) polymer was -32.5℃ and -35℃ respectively at the concentration of 5000ppm. It showed that the P(LMA/OMA/St) polymer was lower than the existing additives. In the results of cloud point, the cloud point of the synthetic polymers revealed -3℃ lower than before addition of the polymers and -2℃ lower than the cloud point of existing additives.

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UCI(KEPA) : I410-ECN-0101-2010-551-002328153