A series of new optically active aromatic poly(ester amide)s containing a chiral group in the side chain prepared from the p-toluenesulfonic acid salt of o,o'-bis(leucyl)-hexanediol (TS-+LHD+TS-) and p-phthaloyl c...A series of new optically active aromatic poly(ester amide)s containing a chiral group in the side chain prepared from the p-toluenesulfonic acid salt of o,o'-bis(leucyl)-hexanediol (TS-+LHD+TS-) and p-phthaloyl chloride and styrene-2,5- dicarbonyl chloride styrene have been synthesized by interfacial polymerization. The structure of the monomer is elucidated by FT-IR and elemental analysis. The thermal properties of the polymers were studied by DSC and TGA. The chiroptical properties of the above polymer have also been studied by circular dichroism (CD) spectroscopy. Results indicated that these polymers form helical structures.展开更多
I. INTRODUCTION Calorimetry at very low temperatures is one of the useful tools for the investigation of magnetic properties of materials. Paramagnetic substances often exhibit
New optically active poly(ester-imide)s PEIs were prepared from newly synthesized N,N′-(bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic)-bis-L-isoleucine diacid 4 via direct polycondensation with various aromatic dio...New optically active poly(ester-imide)s PEIs were prepared from newly synthesized N,N′-(bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic)-bis-L-isoleucine diacid 4 via direct polycondensation with various aromatic diols in a system of tosyl chloride (TsCl), pyridine (Py), and N,N-dimethylformamide (DMF). The reactions with bicyclo TsCl were significantly promoted by controlling alcoholysis with diols, in the presence of catalytic amounts of DMF, to give a series of optically active PEIs, with good yield and moderate inherent viscosity ranging from 0.44 to 0.66 dL/g. The diacid 4 was synthesized by the condensation reaction of [2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride 1 with L-isoleucine 2 in acetic acid. All of these polymers were highly organosoluble in solvents such as N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), dimethylsulfoxide (DMSO), and N-methyl-2-pyrrolidone (NMP) at room temperature. They were fully characterized by means of NMR spectroscopy, FTIR spectroscopy, gel permeation chromatography (GPC), elemental analyses, inherent viscosity, solubility test, and specific rotation, and thermal properties of the poly(ester-imide)s were investigated using TGA/DTG.展开更多
基金This work was supported by the National Natural Science Foundation of China (No. 20134010,20274003).
文摘A series of new optically active aromatic poly(ester amide)s containing a chiral group in the side chain prepared from the p-toluenesulfonic acid salt of o,o'-bis(leucyl)-hexanediol (TS-+LHD+TS-) and p-phthaloyl chloride and styrene-2,5- dicarbonyl chloride styrene have been synthesized by interfacial polymerization. The structure of the monomer is elucidated by FT-IR and elemental analysis. The thermal properties of the polymers were studied by DSC and TGA. The chiroptical properties of the above polymer have also been studied by circular dichroism (CD) spectroscopy. Results indicated that these polymers form helical structures.
文摘I. INTRODUCTION Calorimetry at very low temperatures is one of the useful tools for the investigation of magnetic properties of materials. Paramagnetic substances often exhibit
文摘New optically active poly(ester-imide)s PEIs were prepared from newly synthesized N,N′-(bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic)-bis-L-isoleucine diacid 4 via direct polycondensation with various aromatic diols in a system of tosyl chloride (TsCl), pyridine (Py), and N,N-dimethylformamide (DMF). The reactions with bicyclo TsCl were significantly promoted by controlling alcoholysis with diols, in the presence of catalytic amounts of DMF, to give a series of optically active PEIs, with good yield and moderate inherent viscosity ranging from 0.44 to 0.66 dL/g. The diacid 4 was synthesized by the condensation reaction of [2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride 1 with L-isoleucine 2 in acetic acid. All of these polymers were highly organosoluble in solvents such as N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), dimethylsulfoxide (DMSO), and N-methyl-2-pyrrolidone (NMP) at room temperature. They were fully characterized by means of NMR spectroscopy, FTIR spectroscopy, gel permeation chromatography (GPC), elemental analyses, inherent viscosity, solubility test, and specific rotation, and thermal properties of the poly(ester-imide)s were investigated using TGA/DTG.
