scholarly journals Microwave-assisted synthesis and characterization of some optically active poly(ester-imide) thermoplastic elastomers

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Saeed Zahmatkesh ◽  
Abdol Reza Hajipour
Keyword(s):  
Thermal Analyses ◽  
Specific Rotation ◽  
Thermoplastic Elastomers ◽  
Optically Active ◽  
Microwave Assisted Synthesis ◽  
H Nmr ◽  
Microwave Assisted ◽  
Diacid Chloride ◽  
Elemental Analyses

AbstractPyromellitic dianhydride (1) was reacted with L-leucine (2) to result in [N,N'-(pyromellitoyl)-bis-L-leucine diacid] (3). This compound (3) was converted to N,N'-(pyromellitoyl)-bis-L-leucine diacid chloride (4) by reaction with thionyl chloride. The microwave-assisted polycondensation of this diacid chloride (4) with polyethyleneglycol-diol (PEG-200) and/or three synthetic bisphenols furnish a series of new PEIs and Co-PEIs in a laboratory microwave oven (Milestone). The resulting polymers and copolymers have inherent viscosities in the range of 0.31- 0.53 dl g-1. These polymers are optically active, thermally stable and soluble in polar aprotic solvents such as DMF, DMSO, NMP, DMAc and sulfuric acid. All of the above polymers were fully characterized by IR spectroscopy, 1H NMR spectroscopy, elemental analyses, specific rotation and thermal analyses. Some structural characterizations and physical properties of these optically active PEIs and Co-PEIs are reported.

Optically active polymer: synthesis and characterization of new optically active poly (hydrazide-imide)s incorporating L- leucine

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Abdol Reza Hajipour ◽  
Saeed Zahmatkesh ◽  
Arnold E. Ruoho
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Specific Rotation ◽  
Optically Active ◽  
Gravimetric Analysis ◽  
Optically Active Polymer ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
Good Thermal Stability ◽  
H Nmr

AbstractThis paper deals with the polycondensation between a chiral diacyl chloride (N,N′-Pyromelliticdiimido-di-L-leucine chloride) and six different dihydrazides. The corresponding poly (hydrazide-imide)s which have been obtained in quantitative yields are moderately soluble in polar aprotic solvents, have good thermal stability and optical activity. The synthetic compounds have been characterized by IR, UV and 1H NMR spectroscopy, elemental analysis and specific rotation. The thermal properties of the polymers (10 and 15) have been studied by thermo gravimetric analysis (TGA) and differential scanning calorimetry (DSC).

Interfacial synthesis and characterization of L-lysinederived optically active poly(hydrazide-imide)s

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Saeed Zahmatkesh ◽  
Alireza Banaei ◽  
Ashkbous Yazdanpanah
Keyword(s):  
Specific Rotation ◽  
Viscosity Measurement ◽  
Optically Active ◽  
Synthesis And Characterization ◽  
Aprotic Solvents ◽  
Glass Transition Temperatures ◽  
H Nmr ◽  
Interfacial Synthesis ◽  
Ft Ir

AbstractSix novel poly(hydrazide-imide)s (PHIa-f) were prepared from the reaction of a novel L-lysine-derived chiral diacid, ethyl L-lysine-N,N'-ditrimellitoyl diacide (1), with six synthetic dihydrazides by interfacial polycondensation. These polymers have inherent viscosities in the range of 0.23 to 0.42 dl g-1, display optical activity, and are readily soluble in polar aprotic solvents. They start to decompose (T10%) above 248 ºC and display glass-transition temperatures at 164.37-210.20 0C All of the above polymers were fully characterized by UV, FT-IR and 1H NMR spectroscopy, elemental analysis, TGA, DSC, inherent viscosity measurement and specific rotation.

Optically active: microwave-assisted synthesis and characterization of l-lysine-derived poly (amide-imide)s

Amino Acids ◽  
2010 ◽  
Vol 41 (2) ◽  
pp. 485-494 ◽  
Author(s):  
Ali Reza Alborzi ◽  
Saeed Zahmatkesh ◽  
Karim Zare ◽  
Javad Sadeghi
Keyword(s):  
Optically Active ◽  
Synthesis And Characterization ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

Study on synthesis and characterization of novel optically active poly(amide-imide)s based on bis(p-aminobezoic acid)-N-trimellitylimido-S-valine via direct polycondensation

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Shadpour Mallakpour ◽  
Majid Kolahdoozan
Keyword(s):  
Acetic Acid Solution ◽  
Specific Rotation ◽  
Optically Active ◽  
High Yield ◽  
Aminobenzoic Acid ◽  
H Nmr ◽  
Diaminodiphenyl Sulfone ◽  
Tosyl Chloride ◽  
Diacid Chloride ◽  
Poly Condensation

AbstractN-Trimellitylimido-S-valine (3) was prepared by reaction of trimellitic anhydride (1) with S-valine (2) in acetic acid solution at refluxing temperature. This diacid was reacted with thionyl chloride and N-trimellitylimido-S-valine diacid chloride (4) was obtained in quantitative yield. The reaction of this diacid chloride with p-aminobenzoic acid was carried out in dry tetrahydrofurane and bis(paminobenzoic acid)-N-trimellitylimido-S-valine (5) was obtained as a novel optically active amide-imide diacid monomer in high yield. The direct poly condensation of amide-imide diacid monomer with aromatic diamins such as 4,4'-diaminodiphenyl sulfone, 4,4'-diaminodiphenyl ether, benzidine, 4,4'-diaminodiphenyl methane, 1,4- phenylene diamine and 2,5-diamino toluene was carried out in tosyl chloride/ pyridine/dimethylformamide system. The resulting novel optically active poly(amide-imide)s (PAIs) with inherent viscosities ranging from 0.24-0.76 dLg-1, were obtained in good yield. All of these polymers were fully characterized with FTIR spectroscopy and specific rotation. Some elemental analysis, thermal properties and 1H-NMR of these new optically active PAIs are also reported.

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