تهيه و شناسايي پلي آميدهاي جديد فعال نوري و مقاوم به حرارت حاوي آمينواسيدL- لوسين در زنجيره جانبي به عنوان يك گروه زيست تخريب پذير

چكيده انگليسي :

AbstractIn this project a series of novel chiral and biodegradable polyamides PA s based onL leucine amino acid were synthesized For this purpose at first 2S 5 4 4 methyl 2 phthalimidyl penthanoylamino benzoylamino isophthalic acid was prepared in fivesteps Polymers were prepared from condensation reaction of mentioned diacid withdifferent aliphatic and aromatic diisocyanates in common organic solvents and moltenionic liquid MIL in the presence of dibutyltin dilaurate DBTDL as a catalyst andwithout any catalyst by two methods gradual heating and microwave irradiationmethods Ionic liquids IL s have attracted much attention given their widespreadpotential for practical applications They have many attractive properties such aschemical and thermal stability non flammability high ionic conductivity and a wideelectrochemical potential window An IL is a salt composed of an asymmetric organiccation and most commonly an inorganic anion which is liquid at or near roomtemperature These solvents have the ability to dissolve a range of inorganic organic and polymeric materials at very high concentrations They are non corrosive andnegligible vapor pressure at ambient condition makes these substances attractive as green solvents and in contrast to conventional solvents they do not produce volatileorganic compounds due to their insignificant vapor pressure Ammonium quaternarytype aliphatic cation is one cationic part of IL s They are widely used for manyapplications such as lubricating materials cationic surfactants fabric softeners andelectrostatics adhesion promoters in asphalt corrosion inhibitors and advancedbattery technology that due to their IL behavior Recently moltentetrabutylammonium bromide TBAB has been used as an efficient catalyst forMichael addition in a number of useful synthetic transformations These reactionscatalyzed by molten TBAB are in general very fast and clean Because of using thisIL it s commodious and high dielectric property that caused of rapid absorbtion ofmicrowave irradiation and accordingly increase rate reaction In addition to theseadvantages it is good situated for toxic common solvents Chiral phenomena playimportant roles in nature Considerable interest has been drawn to the synthesis andapplication of optically active polymers because of their potential ability inapplications such as molecular recognition construction of supermolecular assemblysystems and liquid crystalline formation In addition synthesis of optically activepolymers is a topic that has been paid more attention Specially the synthesis ofpolymers containing amino acids is a subject of much interest since a high degree ofamino acid functionality can lead to polymers with increased solubility and the abilityto form secondary structures Possible applications of amino acid based polymersinclude dentistry drug delivery gene therapy tissue engineering chiral recognitionstationary phases asymmetric catalysts metal ion absorbents and biomaterials Aromatic polyamides are high performance polymeric materials for their excellenthigh thermal and chemical resistance favorable electrical insulating properties as wellas superior mechanical characteristics and their potential as high performancematerials for several applications Because of the stiffness of the polymer chains andthe strong molecular interactions through hydrogen bonding their solubility is limitedand the high temperatures restrict their extensive uses Therefore numerous effortshave been made to improve their processability by structural modification Theincorporation of pendant bulky packing disruptive groups along the polymerbackbone outcomes in a less ordered polymer matrix hence increasing the solubilitycharacteristics while other advantageous properties are retained Finally the inherentviscosity and rotation of resulting polymers were measured The structures ofmonomer and polymers were confirmed by different identification methods such asFT IR UV Vis 1H NMR and elemental analysis The TGA

زاده نظري، امين

تهيه و شناسايي پلي آميدهاي جديد فعال نوري و مقاوم به حرارت حاوي آمينواسيدL- لوسين در زنجيره جانبي به عنوان يك گروه زيست تخريب پذير

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