Microwave-assisted synthesis of modified polyaspartic acid in solvent

Abstract

Abstract: Polyaspartic acid (PASP) is suitable for the inhibition of scale deposition from water. To
enhance its inhibition efficiency, PASP was modified by reacting aspartic acid (Asp) with
glutamic acid (Glu) to provide Asp-Glu copolymer under microwave irradiation. The influence
of reaction parameters on conversion, molecular weight and inhibition of CaCO3
precipitation was investigated Infra-red. (IR), 1H nuclear magnetic resonance (1H NMR) and
13C nuclear magnetic resonance (13C NMR) spectroscopies were used to characterize the
copolymer. The results show that copolymerization of aspartic acid and glutamic acid is
catalyzed by a small amount of phosphorous acid (H3PO4) in solvent, the product conversion
is 98.05% under the following conditions: the molar ratio of glutamic acid to reactant
[Glu/(Asp＋Glu)] is 0.3 and that of catalyst (Cat) to reactant [Cat/(Glu+Asp)] is 0.05
(0.65ml H3PO4), the volume of solvent dimethylformamide is 16ml, the microwave power used
is 720W and the reaction for 3 min. The weight average molecular weight of copolymer
synthesized under these conditions is 2709 and the inhi-bition rate for CaCO3 is 97.75%.

Key words: microwave irradiation, aspartic acid, glutamic acid, copolymer, conversion ratio, scale inhibition

摘要： Polyaspartic acid (PASP) is suitable for the inhibition of scale deposition from water. To
enhance its inhibition efficiency, PASP was modified by reacting aspartic acid (Asp) with
glutamic acid (Glu) to provide Asp-Glu copolymer under microwave irradiation. The influence
of reaction parameters on conversion, molecular weight and inhibition of CaCO3
precipitation was investigated Infra-red. (IR), 1H nuclear magnetic resonance (1H NMR) and
13C nuclear magnetic resonance (13C NMR) spectroscopies were used to characterize the
copolymer. The results show that copolymerization of aspartic acid and glutamic acid is
catalyzed by a small amount of phosphorous acid (H3PO4) in solvent, the product conversion
is 98.05% under the following conditions: the molar ratio of glutamic acid to reactant
[Glu/(Asp＋Glu)] is 0.3 and that of catalyst (Cat) to reactant [Cat/(Glu+Asp)] is 0.05
(0.65ml H3PO4), the volume of solvent dimethylformamide is 16ml, the microwave power used
is 720W and the reaction for 3 min. The weight average molecular weight of copolymer
synthesized under these conditions is 2709 and the inhi-bition rate for CaCO3 is 97.75%.

关键词: microwave irradiation;aspartic acid;glutamic acid;copolymer;conversion ratio;scale inhibition

ZHANG Yuling, HUANG Junli, CHENG Zhihui, YANG Shilin. Microwave-assisted synthesis of modified polyaspartic acid in solvent[J]. .

张玉玲, 黄君礼, 程志辉, 杨士林. 微波溶剂法合成天冬氨酸-谷氨酸共聚物研究[J]. CIESC Journal.

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