A theoretical approach to polycondensation reaction of Aa-Bb type Involving intramolecular cycllzatlon has been proposed by Tang Au-chin et al.. In this paper, the theoretical sol-gel distribution is tested by polycon...A theoretical approach to polycondensation reaction of Aa-Bb type Involving intramolecular cycllzatlon has been proposed by Tang Au-chin et al.. In this paper, the theoretical sol-gel distribution is tested by polycondensation of adipic acid with trimethylol propane in a sto-ichiometric ratio of 0. 8, and the effect of intramolecular cyclization is discussed in detail.展开更多
A potential biodegradable and optically active bulky chiral aromatic amide-imidic diacid monomer,（2S,3S）-5-（3- methyl-2-phthalimidylpentanoylarnino）isophthalic acid（7）,containing a rigid phthalimide and flexible...A potential biodegradable and optically active bulky chiral aromatic amide-imidic diacid monomer,（2S,3S）-5-（3- methyl-2-phthalimidylpentanoylarnino）isophthalic acid（7）,containing a rigid phthalimide and flexible L-isoleucine pendant group was synthesized in three steps.New aromatic polyamides including pendant phthalimido groups and flexible side spacers have been synthesized by direct polycondensation reaction of equimolar amounts of different aromatic diamines with an optically active diacid 7,using N-methyl-2-pyrrolidone（NMP） as a solvent and triphenyl phosphite/CaCl_2/pyridine as a condensing agent.These polyamides were characterized by FTIR,~1H-NMR spectroscopy,specific rotation, thermogravimetric and elemental analysis.The resulting polymers have inherent viscosities in the range of 0.21-0.45 dL/g. Amino acid existence in this backbone results in optically active polymers.Due to introduction of bulky and flexible groups in these polyamides,they show improved solubility in polar aprotic solvents such as NMP and dimethylacetamide and also good thermal stability（10%weight loss temperatures in excess of 330℃,and char yields at 600℃in nitrogen higher than 62%）.展开更多
文摘A theoretical approach to polycondensation reaction of Aa-Bb type Involving intramolecular cycllzatlon has been proposed by Tang Au-chin et al.. In this paper, the theoretical sol-gel distribution is tested by polycondensation of adipic acid with trimethylol propane in a sto-ichiometric ratio of 0. 8, and the effect of intramolecular cyclization is discussed in detail.
基金supported by the Research Affairs Division Isfahan University of Technology(IUT),IsfahanNational Elite Foundation(NEF) Center of Excellency in Sensors and Green Chemistry Research(IUT)
文摘A potential biodegradable and optically active bulky chiral aromatic amide-imidic diacid monomer,（2S,3S）-5-（3- methyl-2-phthalimidylpentanoylarnino）isophthalic acid（7）,containing a rigid phthalimide and flexible L-isoleucine pendant group was synthesized in three steps.New aromatic polyamides including pendant phthalimido groups and flexible side spacers have been synthesized by direct polycondensation reaction of equimolar amounts of different aromatic diamines with an optically active diacid 7,using N-methyl-2-pyrrolidone（NMP） as a solvent and triphenyl phosphite/CaCl_2/pyridine as a condensing agent.These polyamides were characterized by FTIR,~1H-NMR spectroscopy,specific rotation, thermogravimetric and elemental analysis.The resulting polymers have inherent viscosities in the range of 0.21-0.45 dL/g. Amino acid existence in this backbone results in optically active polymers.Due to introduction of bulky and flexible groups in these polyamides,they show improved solubility in polar aprotic solvents such as NMP and dimethylacetamide and also good thermal stability（10%weight loss temperatures in excess of 330℃,and char yields at 600℃in nitrogen higher than 62%）.
