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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 34 (1995), S. 43-48 
    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 New aromatic polymers containing formamidine groups were prepared by high temperature solution polycondensation of triethyl orthoformate with various aromatic diamines. The resulting polyformamidines were characterized by elemental analysis, IR' and 1H NMR spectroscopy, viscosity measurements, thermogravimetry, DSC- and WAXS measurements. With few exceptions aromatic polyformamidines show excellent solubility in polar solvents and strong acids, but they were gradually decomposed in extended contact with moisture. Polyformamidines containing rigid para structures are well crystallizing materials, which was proved by WAXS investigations. Glass transition temperatures in the range of 62 – 163°C were observed for semicrystalline or amorphous polymers. All aromatic polyformamidines are thermally stable in nitrogen up to 300°C.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 228 (1995), S. 41-50 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: N-(3-Acetoxyphenyl)trimellitsäureimid und N-(2-Methyl-4-acetoxyphenyl)trimellitsäureimid wurden in Schmelze und dem inerten Wärmeüberträger Marlotherm-S® unter verschiedenen Reaktionsbedingungen polykondensiert. Die synthetisierten Homopoly(esterimid)e sind unlöslich, unschemelzbar, und hochkristallin. Sie verfügen über eine sehr hohe Thermostabilität, die mit dem Homopoly(esterimid) auf der Basis von N-(4-Acetoxyphenyl)trimellitsäureimid vergleichbar ist. Jedoch konnte durch die Modifizierung der Monomereinheit keine wesentliche Schmelzpunktabsenkung im Homopoly(esterimid) erhalten werden, die eine Verarbeitung des Polyesters aus der Schmelze erlaubt.Der mittlere Polykondensationsgrad ist hauptsächlich von der Reaktionstemperatur und der Reaktionszeit abhängig. Verschiebungen von IR-Banden im Bereich der aromatischen Ringstreckschwingungen erlauben die Identifikation der einzelnen Imideinheiten auch in Copolyestern.
    Notes: Polycondensation reactions of N-(3-acetoxyphenyl) trimellitic acid imide and N-(2-methyl-4-acetoxyphenyl) trimellitic acid imide were carried out in bulk or in the inert reaction medium Marlotherm-S® under various reaction conditions. All synthesized homopoly(ester imide)s are insoluble in common organic solvents, not meltable and highly crystalline. The thermostability of the synthesized polyesters is very high and comparable with that of the polyester on the basis of N-(4-acetoxyphenyl) trimellitic acid imide. But also the modified monomer units do not lower the melting temperature range, in which the polyester could be processed from the melt.The average degree of polycondensation depends mainly on reaction temperature and reaction time. Shifts of \documentclass{article}\pagestyle{empty}\begin{document}$$\nu _{c - c_{ar} }$$\end{document} in the FTIR spectra allow to identify various substituted monomer units also in copolyesters.
    Additional Material: 5 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 229 (1995), S. 159-174 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Vollaromatische Copoly(esterimid)e wurden aus den Imidmonomeren N-(3-Acetoxyphenyl)trimellitsäureimid und N-(2-Methyl-4-acetoxyphenyl)trimellitsäureimid mit 4-Acetoxybenzoesäure als Comonomerem in Schmelze und verschiedenen Monomerverhältnissen synthetisiert. Die Eigenschaften der Copoly(esterimid)e im Festkörper und das Schmelz- und Phasenverhalten unterscheiden sich stark. Sie weisen jedoch alle eine hohe Thermostabilität auf. Einige Polyester bilden in der Schmelze Mesophasen aus.Copoly(esterimid)e aus N-(3-Acetoxyphenyl)trimellitsäureimid und 4-Acetoxybenzoesäure bzw. einige Copolyester des ternären Systems sind für eine Verarbeitung aus der Schmelze geeignet.Die Copolyester aus N-(2-Methyl-4-acetoxyphenyl)trimellitsäureimid und 4-Acetoxybenzoesäure sind jedoch bei Temperaturen unterhalb des Zersetzungsbereiches (≤480°C) unschmelzbar.
    Notes: Fully aromatic copoly(ester-imide)s of various compositions were synthesized in bulk by conversion of N-(3-acetoxyphenyl)trimellitic acid imide and N-(2-methyl-4-acetoxyphenyl)trimellitic acid imide with 4-acetoxybenzoic acid as comonomer. The solid state properties, the melting and phase behaviour of the copoly(ester-imide)s differ largely, but all of them show high thermal stability. Some of the copoly(ester-imide)s form mesophases in the melt.Most of the investigated copoly(ester-imide)s of N-(3-acetoxyphenyl)trimellitic acid imide and 4-acetoxybenzoic acid and some of the ternary systems could be processed from the melt. Copoly(ester-imide)s of N-(2-methyl-4-acetoxyphenyl)trimellitic acid imide and 4-acetoxybenzoic acid, however, do not melt before rapid degradation at temperatures above 480°C.
    Additional Material: 7 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 196 (1995), S. 3323-3339 
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The paper describes synthesis and characterization of some new side-chain liquid crystalline polymers (SCLCP) obtained by homo- and copolymerization of fumarates with two mesogenic groups per unit. The homopolymerization of spacerless bis[4-(4-butoxy-benzoyloxy)phenyl] fumarate (1) did not take place due to steric hindrance of the propagation reaction by the bulky phenyl benzoate groups. The radically induced polymerization of the fumarates with spacer between fumaric unit and the mesogenic groups was performed in bulk. At the polymerization temperature the monomers were isotropic. During polymerization the mixtures became turbid due to phase separation of the isotropic monomer and the resulting polymerization products which formed a liquid crystalline (lc) phase. The molecular weights of the obtained homopolymers were relatively low and depended on spacer length. Transfer reactions to the monomer occurred to a considerable extent. The homopolymers showed an enantiotropic SA phase. This was confirmed by X-ray measurements. A model for the arrangement of the polymer backbones in the smectic phase is given. Copolymerization of bis{6-[4-(4-butoxybenzoyloxy)benzoyloxy]hexyl} fumarate (4) with styrene yielded copolymers 6 with different percentages of styrene. All copolymers formed an enantiotropic SA phase. With increasing percentage of styrene the transition to the isotropic state was shifted toward lower temperatures.
    Additional Material: 9 Ill.
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  • 5
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In-situ attenuated total reflection (ATR)-FTIR spectroscopy was used to monitor the consecutively alternating adsorption of polyethylenimine (PEI) and poly(acrylic acid) (PAC) onto both Si crystals (SiO) and CO2 plasma-treated polypropylene (PP) films. The vibration band vas(COO-) and v(C=O) of PAC are diagnostic for the polyelectrolyte layer build-up and sensitive to protonation changes. Human serum albumine (HSA) adsorption experiments revealed a strong decrease of fouling for the PP films, which were modified with polyelectrolyte multilayers, in comparison to the unmodified ones.
    Additional Material: 4 Ill.
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  • 6
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The paper describes the synthesis of thermotropic elastomers from trimellitimide-terminated poly(oxy-1,4-butanediyl) [synonyms: poly(tetramethylene ether glycol), PTMG; poly(tetrahydrofuran), poly(THF)] and acetoxy group-terminated rigid blocks. Copolyester imides are formed by transesterification polycondensation in the melt. According to 13C NMR investigations, their chain sequence distribution is characterized by a block-like structure in which the preformed rigid units are partially exchanged by transesterification reactions during the melt polycondensation. The degree of transesterification depends on the reaction time. The influence of the length of the flexible PTMG units and of the concentration of rigid units on the phase behaviour as well as on the thermal behaviour and the dynamic-mechanical behaviour of the block copolymers is discussed with respect to aromatic model compounds.
    Additional Material: 16 Ill.
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  • 7
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Fully aromatic and aromatic-aliphatic polyformamidines were prepared by high-temperature solution polycondensation of the appropriate diamines with triethyl orthoformate (TEOF). Copolyformamidines of benzidine (4,4′-biphenyldiamine) with p-phenylene and trans-1,4-cyclohexylene units, respectively, showed liquid-crystalline behaviour. Both series of copolyformamidines differ distinctly in crystallinity. This has been discussed with respect to sequence distribution, which was determined by 13 C NMR spectroscopy.
    Additional Material: 3 Ill.
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  • 8
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: FTIR spectroscopy, differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) were used for the characterization of structural properties of a cross-linkable ternary liquid crystalline (lc) copolyester and its binary model copolyesters. The copolyesters based on itaconoylbis(4-oxybenzoic acid), sebacoylbis(4-oxybenzoic acid) and 2-methylhydroquinone were annealed at different temperatures to analyse the structural changes of mesogenic and spacer segments due to their phase transitions. The results of the DSC and WAXS measurements are useful to explain the small effects in the IR spectra connected with polymer morphology. FTIR spectroscopy is able to provide information about the molecular structure along the polymer chains and also about the interactions between these chains. Micro- and macromolecular structures influence the orientation and crosslinking processes in dependence on temperature and time. It was shown that an increase in the ordered state and quality of crystallinity was obtained using different annealing procedures.
    Additional Material: 10 Ill.
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  • 9
    Publication Date: 2006-04-05
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 10
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