Preparation and properties of polyimides and polyamide-imides from diisocyanates

Barikani, Mehdi; Ataei, Shahram Mehdipour

doi:10.1002/(sici)1099-0518(19990701)37:13<2245::aid-pola39>3.0.co;2-r

Cited by 38 publications

(15 citation statements)

References 14 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The synthesis was carried out according to several patents (Zecher et al, 1969;Izumi et al, 1974;Sintes-Zydowicz et al, 1993;Barikani et al, 1999;Kikuchi et al, 2011;Yuhong-Qi et al, 2017). The reaction consists of a mixture of TMA (19.76 g, 0.103 mol), MDI (25.74 g, 0.103 mol) and dry NMP (84.50 g, 0.852 mol).…”

Section: Synthesis Of Poly(amide-imide)mentioning

confidence: 99%

Obtaining kinetic parameters of polyamide imide reaction

López-Badillo¹,

Velasco-Hernández²,

García-Castro³

et al. 2019

Rev.Mex.Ing.Quim.

View full text Add to dashboard Cite

show abstract

Section: Synthesis Of Poly(amide-imide)mentioning

confidence: 99%

Obtaining kinetic parameters of polyamide imide reaction

López-Badillo¹,

Velasco-Hernández²,

García-Castro³

et al. 2019

Rev.Mex.Ing.Quim.

View full text Add to dashboard Cite

show abstract

“…Thus, more attention has been paid to the modification of these macromolecules by the introduction of heterocyclic groups into the backbone of PUs. [9][10][11][12] Polyimides (PIs) with aromatic heterocyclic structures are heatresistant and have good chemical and electrical properties. Because of their outstanding thermal stability and mechanical properties, 8 their applicability can be maintained even after revelation at 5008C and higher for several minutes or at 3008C for a couple of months.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of new optically active segmented poly(amide imide urethane)s based on different diacids via an isocyanate route

Mallakpour

Khani

Rafiemanzelat

2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

A new class of optically active poly(amide imide urethane)s (PAIUs) was synthesized via a two-step diisocyanate route. In the first step, 4,4 0 -methylenebis(phenyl isocyanate) (MDI) was reacted with different diacids to produce an isocyanate-terminated oligo(amide imide). The chain extension of the previous hard segment with poly (ethylene glycol) diols with a molecular weight of 400 was the second step for furnishing a series of new PAIUs. N-Trimellitylimido-L-leucine was used as a diacid monomer for polycondensation reactions. Polymerization reactions were performed without any catalysts or with pyridine or dibutyltin dilaurate as a catalyst. The optimized reaction conditions were used for the reaction of N-trimellitylimido-L-isoleucine, N-trimellitylimido-L-methionine, N-trimellitylimido-S-valine, and N-trimellitylimido-L-phenylalanine as diacid monomers with MDI. The resulting multiblock copolymers had inherent viscosities of 0.25-0.78 dL/g. These multiblock copolymers were optically active, thermally stable, and soluble in amide-type solvents. All these polymers were fully characterized with Fourier transform infrared spectroscopy, 1 H-NMR and ultraviolet-visible spectroscopy, specific rotation measurements, and thermal analyses. Some structural characteristics and physical properties of these new optically active PAIUs were examined.

show abstract

“…Polyamide-imide (PAI) is a kind of high-performance thermoplastic resin.It isused for advanced applications, such as in the electrical, aerospace, automobile and energy fields in the form of adhesives, composite materials and coating materials, related to their combinationof high toughness, high thermal stability, high glass transition temperature and enhanced chemical resistance [1][2][3][4][5]. Polyamide-imide can be obtained from different strategies of synthesis.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and curing process of TMA-MDI polyamide-imides

et al. 2017

MATEC Web Conf.

View full text Add to dashboard Cite

Abstract. The influence of molecular ratio of monomers, reaction time, reaction temperature and solid content on the molecular weight of polyamide imides(PAI), heating rate, temperature and time on tensile properties of PAI film was investigated in detail. The results showed that when monomer molar ratio (MDI: TMA)R >1, PAI is an isocyanate terminated, intrinsic viscosity increases with the increase of R, reaches maximum value at R=1.06, then it decreases obviously. Contrarily, when R <1, PAI is terminated with anhydride, intrinsic viscosity increases with the decrease of R, its maximum value at R= 0.97, then it decreases with the decrease of R. The relation between intrinsic viscosityof PAI and reaction temperature, reaction time, solid content all follows the parabolic law. The optimal reaction temperature,reaction time, solid content is 140℃, 120 min, 30%. Therefore, the best synthesis process of the PAI is reacting for 120 min at 140℃ when 30% solid content and R=1.06. Tensile strength and elongation increase with the increase of heating rate, curing temperature and curing time, after peak value, they decrease with the increase of heating rate, curing temperature andcuring time. The best curing process of the PAI is curing for 2h at 260℃and heating rate 100℃/h.

show abstract

Preparation and properties of polyimides and polyamide-imides from diisocyanates

Cited by 38 publications

References 14 publications

Obtaining kinetic parameters of polyamide imide reaction

Obtaining kinetic parameters of polyamide imide reaction

Synthesis and characterization of new optically active segmented poly(amide imide urethane)s based on different diacids via an isocyanate route

Synthesis and curing process of TMA-MDI polyamide-imides

Contact Info

Product

Resources

About