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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and properties of novel aromatic polyimides of 2,3-bis(4-aminophenoxy)naphthalene (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 4865-4871 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00070a022
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of solvents and additives on the reaction of N-(benzyloxycarbonyl)-L-aspartic anhydride with L-phenylalanine methyl ester (synthesis of aspartame) (1986)
    s.l. : American Chemical Society
    The @journal of organic chemistry 51 (1986), S. 5186-5191 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00376a025
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and properties of new poly(amide-imide)s based on 2,5-bis(trimellitimido)toluene (1999)
    Springer
    Polymer bulletin 42 (1999), S. 1-8 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A series of new aromatic poly(amide-imide)s were synthesized by the triphenyl phosphite activated polycondensation of the diimide-diacid, 2,5-bis(trimellitimido)toluene (I) with various aromatic diamines. The poly(amide-imide)s had inherent viscosities of 0.69–1.89 dL/g. Most of the resulting polymers showed an amorphous nature and were readily soluble in a variety of organic solvents. Transparent, flexible, and tough films of these polymers could be cast from DMAc or NMP solutions. Their cast films had tensile strengths ranging from 76 to 112 MPa, elongations at break from 8 to 31%, and initial moduli from 2.20 to 2.99 GPa. The glass transition temperatures of these polymers were in the range of 253–328°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050427
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of new organo-soluble poly(amide-imide)s based on 1,4-bis(trimellitimido)-2,5-dimethylbenzene (1999)
    Springer
    Polymer bulletin 43 (1999), S. 21-28 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A series of new aromatic poly(amide-imide)s were synthesized by the triphenyl phosphite activated polycondensation of the diimide-diacid, 1,4-bis(trimellitimido)-2,5-dimethylbenzene (I), with various aromatic diamines. The poly(amide-imide)s had inherent viscosities of 1.13–2.22 dL/g. Most of the resulting polymers showed an amorphous nature and were readily soluble in a variety of organic solvents. Transparent, flexible, and tough films of these polymers could be cast from DMAc or NMP solutions. Their cast films had tensile strengths ranging from 64 to 116 MPa, elongations at break from 6 to 20%, and initial moduli from 2.18 to 3.90 GPa. The glass transition temperatures of these polymers were in the range of 247–324°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050528
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation and properties of poly(amideether-imide)s derived from 1,4-bis(4-aminophenoxy)benzene, trimellitic anhydride, and various aromatic diamines (1995)
    Springer
    Journal of polymer research 2 (1995), S. 179-186 
    Details
    ISSN: 1572-8935
    Keywords: 1,4-Bis(4-trimellitimidophenoxy)benzene ; Direct polycondensation ; Poly(amide-etherimide)s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An imide ring containing dicarboxylic acid, 1,4-bis(4-trimellitimidophenoxy)benzene (III), was prepared by the condensation of 1,4-bis(4-aminophenoxy)benzene and trimellitic anhydride. A series of new poly(amide-ether-imide)s were prepared by the direct polycondensation of diimide-diacid III with various aromatic diamines using triphenyl phosphite and pyridine as condensing agents inN-methyl-2-pyrrolidone (NMP) in the presence of calcium chloride. The highest inherent viscosity value of a poly(amide-ether-imide) obtained was 1.78 dL/g (inN,N-dimethylacetamide, DMAc, at 30 °C). Flexible films with excellent tensile properties were cast from DMAc solutions. Glass transition temperatures of these poly(amide-ether-imide)s were recorded in the range of 248–297 “C. These polymers do not show obvious weight loss before 400°C; the decomposition temperatures at which 10% weight loss in nitrogen and in air were observed for these poly(amide-ether-imide)s in the range of 521–564°C and 501–539°C, respectively. The polymers derived fromp-phenylenediamine or the diamines containing 1,4-bisphenoxy units exhibited a higher degree of crystallinity and higher initial decomposition temperatures but poor solubility in organic solvents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01494254
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and thermal properties of bismaleimides with ortho-linked aromatic units (1999)
    Springer
    Journal of polymer research 6 (1999), S. 141-148 
    Details
    ISSN: 1572-8935
    Keywords: Bismaleimide ; BMI ; Ortho-linked bis(ether amine) ; Thermal property
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Three bismaleimides (BMIs) each having an ortho-linked aromatic unit were prepared by condensation of maleic anhydride with 1,2-bis(4-aminophenoxy)benzene (1a), 1,2-bis(4-aminophenoxy)-4-tert-butylbenzene (1b), or 2,3-bis(4-aminophenoxy)naphthalene (1c). The molecular structures of these BMIs were confirmed by elemental, IR, and NMR analyses. The thermal behavior of the BMIs was evaluated by differential scanning calorimetry (DSC), and the thermal properties of the thermally cured BMI resins were determined by dynamic thermogravimetric analysis (TGA) and thermomechanical analysis (TMA). The effects of structure of the BMIs on the curing behavior of the BMIs and on the properties of the cured resins were investigated. The BMI of 1a had a relatively high melting point (256 °C) and immediately polymerized after having been melted. The 1b-and 1c-based BMIs with a bulkier molecular structure exhibited lower melting points (136 and 171 °C), facilitating the use of these BMIs in the molten state. The cured BMI resins did not show significant decomposition below 450 °C in air or nitrogen and did not soften below 400 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0081-4
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation and properties of polyamide-imides derived from 1,3-bis(4-aminophenoxy)benzene, trimellitic anhydride, and various aromatic diamines (1994)
    Springer
    Journal of polymer research 1 (1994), S. 43-49 
    Details
    ISSN: 1572-8935
    Keywords: Poly(amide-imide)s ; Polycondensation ; Phosphorylation ; Aromatic diamines ; 1,3-bis(4-aminophenoxy)benzene ; 1, 3-bis(4-trimellitimidophenoxy)benzene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A diamine, 1,3-bis(4-aminophenoxy) benzene (II), was synthesized in two steps; fist from the condensation of resorcinol with p-chloronitrobenzene in the presence of potassium carbonate, producing I ,3-bis(4-nitrophenoxy) benzene (I), followed by hydrazine hydrate/Pd-C reduction. A two imide rings-preformed dicarboxylic acid, 1,3-bis(4-trimellitimidophenoxy)benzene (III), was prepared from the condensation of diamine II and trimellitic anhydride in 1:2 molar ratio. A series of structurally new polyamide-imides (Va-p) were directly synthesized from the diacid III and various aromatic diamines (IVa-p). The resultant polyamide-imides had inherent viscosities between 0.56–1.39 dl/g. All polymers, except some derived from diamines with p-phenoxy structure, showed excellent solubility. Some polymer resulted in tough or flexible transparent films. Dynamic TG data indicated that all polymers possess excellent thermal stability with no significant weight loss up to the temperature of approximately 450 °C in nitrogen, and their 10% weight loss temperature was recorded in the range of 489–577 °C. Measurements of wide-angle X-ray diffraction revealed that some polymers derived from p-phenoxy group-containing diamines showed crystalline patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378593
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of new poly(amide-imide)s XX. Preparation and properties of poly(amide-Imide)s derived from 1,7-Bis(4-aminophenoxy) naphthalene, trimellitic anhydride, and various aromatic diamines (1996)
    Springer
    Journal of polymer research 3 (1996), S. 193-200 
    Details
    ISSN: 1572-8935
    Keywords: Poly(amide-imide)s ; 1,7-Bis[4-(N-trimellitoyl)phenoxy]naphthalene ; 1,7-Bis(4-aminophenoxy)naphthalene ; Triphenyl phosphite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A dicarboxylic acid (1,7-BTMPN) bearing two preformed imide rings, was prepared from the condensation of 1,7-bis(4-aminophenoxy)naphthalene and trimellitic anhydride. A new family of poly(amide-imide)s with inherent viscosities up to 1.56 dL/g (0.5g/dL in DMAc at 30 °C) was prepared by the triphenyl phosphite activated polycondensation from the diimide-diacid 1,7-BTMPN with various aromatic diamines in a medium consisting ofN-methyl-2-pyrrolidone (NMP), pyridine, and calcium chloride. Most of the resulting polymers were readily soluble in polar solvents such as NMP and DMAc. All the soluble poly(amide-imide)s can form transparent, flexible, and tough films. The glass transition temperatures of these polymers were in the range of 185–267°C and the 10% weight loss temperatures were above 430 °C in nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01494530
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and properties of aromatic polyimides based on ether-sulfone-diamines (1998)
    Springer
    Journal of polymer research 5 (1998), S. 193-198 
    Details
    ISSN: 1572-8935
    Keywords: Polyimides ; Ether-sulfone-diamines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Two diamine monomers, 4,4′-[sulfonylbis(1,4-phenyleneoxy)]dianiline (III a ) and 4,4′-[sulfonylbis(2,6-dimethyl-l,4-phenyleneoxy)]dianiline (III b ), were prepared by an aromatic nucleophilic substitution of 4,4′-sulfonyldiphenol (I a ) and 4,4′-sulfonylbis(2,6-dimethylphenol) (I b ) with p-chloronitrobenzene in the presence of potassium carbonate, followed by hydrazine catalytic reduction of the intermediate dinitro compounds. The diamines III a and III b were used as monomers with various aromatic tetracarboxylic dianhydrides (IV a–f ) to synthesize polyimides. The polymerization was conducted in two steps via the formation of a poly(amic acid) precursor followed by thermal cyclodehydration. The poly(amic acid)s had inherent viscosities above 0.87 and up to 2.56 dL/g. Most poly(amic acid)s could be coated and thermodehydrated into flexible and transparent polyimide films. The polyimides derived from the dianhydrides containing-O-and-SO2-or-C(CF3)2-bridging groups between the phthalic anhydride units were soluble in some organic solvents such as N,N-dimethylacetamide (DMAc) and N,N-dimethylformamide (DMF). The glass transition temperatures (Tg) of the polyimides were in the range from 254 to 300 °C. The methyl-substituted polyimides exhibited slightly higher solubility and higher Tg compared to the corresponding unsubstituted polyimides. Thermogravimetric analysis (TG) showed that the polyimides containing methyl substitutents started to lose weight around 450 °C and the unsubstituted ones started to lose weight around 550 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0056-5
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of polyamides and poly(amide-imide)s based on ether-sulfone-diamines (1998)
    Springer
    Journal of polymer research 5 (1998), S. 243-248 
    Details
    ISSN: 1572-8935
    Keywords: Polyamides ; Poly(amide-imide)s ; Ether-sulfone-diamines ; Methyl substituent ; Solubility ; Tgs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A series of polyamides and poly(amide-imide)s were prepared by the direct polycondensation of 4,4′-[sulfonylbis(1,4-phenyleneoxy)]dianiline or 4,4′-[sulfonylbis(2,6-dimethyl-1,4-phenyleneoxy)]dianiline with aromatic dicarboxylic acids and phthalimide unit-bearing dicarboxylic acids in a N-methyl-2-pyrrolidone (NMP) solution containing dissolved calcium chloride using triphenyl phosphite and pyridine as condensing agents. The inherent viscosities of the resulting polymers were above 0.45 dL/g and up to 1.70 dL/g. Except for the polyamides derived from terephthalic acid and 4,4′-biphenyldicarboxylic acid, all the other polyamides and all poly(amide-imide)s were readily soluble in polar organic solvents such as NMP, N, N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and m-cresol, and afforded transparent and tough films by solution-casting. Most of the polymers showed distinct glass transition on their differential scanning calorimetry (DSC) traces and their glass transition temperatures (Tg) stayed between 140–264 °C. The methyl-substituted polymers showed higher Tgs than the corresponding unsubstituted counterparts. The results of the thermogravimetry analysis (TGA) revealed that all the methyl-substituted polymers showed lower initial decomposition temperatures than the unsubstituted ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0063-6
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