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Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   FEBRUARY 2005 , Volume 14 , Number 2 (56); Page(s) 169 To 180.
 
Paper: 

SYNTHESIS AND PROPERTIES OF NOVEL OPTICALLY ACTIVE POLY(AMIDE IMIDE URETHANE) THERMOPLASTIC ELASTOMERS BY THE REACTION OF A L-LEUCINE BASED-DIACID CHAIN EXTENDER AND PEG-TERMINATED MDI

 
 
Author(s):  MALAKPOUR SH.*, RAFI MANZELAT F.
 
* Organic Polymer Chemistry Research Laboratory, College of Chemistry, Isfahan University of Technology, Isfahan-84156/83111, I.R. Iran
 
Abstract: 

A new class of optically active poly(amide imide urethane) (PAIU) thermoplastic elastomers were synthesized via the reaction of NCO terminated polyether polyols with an imide containing optically active amino acid-based dicarboxylic acid chain extender according to a two-step diisocyanate route. In the first step, 4,4'-methylene-bis-(4-phenylisocyanate) (MDI) (6) was reacted with polyethyleneglycol-diols (PEG)s such as PEG-400, PEG-600, PEG-1000 and PEG-2000 to produce the diisocyanate-terminated polyether polyol (soft segment). The chain extension of the above soft segment with bis(p-amido benzoic acid)-N-trimellitylimido-L-leucine (BPABTL) (5) was the second step to furnish a series of new optically active PAIUs. The prepared PAIUs were characterized by conventional methods, and their physical properties such as solution viscosity, solubility, thermal stability and thermal behaviour were studied. The copolymerization reactions were performed in the presence of triethylamine (TEA), pyridine (Py), dibutyltin dilurate (DBTDL) and no catalyst, respectively. The resulting multiblock copolymers had inherent viscosities in the range of 0.12-0.55 dL/g. These copolymers are optically active, thermally stable and soluble in amide-type solvents. Some structural characterizations and physical properties of these new optically active PAIU thermoplastic elastomers are reported.

 
Keyword(s): POLY(AMIDE IMIDE URETHANE), THERMOPLASTIC ELASTOMER, OPTICALLY ACTIVE, DIACID CHAIN EXTENDER, NCO-TERMINATED, DIISOCYANATE ROUTE
 
References: 
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