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  • 1
    Electronic Resource
    Electronic Resource
    Thermoplastic polyheterocycles. I: Polyalkylene-benzoxazolesPresented in part at the 25th anniversary meeting of the ACS Polymer Group of the North Carolina Section of the American Chemical Society, Chapel Hill, N.C., Nov. 12, 1992. (1994)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 34 (1994), S. 301-304 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polyalkylenebenzoxazoles of high molecular weight (inherent viscosity values from 0.76 to 2.95) were prepared from 4,6-diaminoresorcinol dihydrochloride and aliphatic diacids in polyphosphoric acid by heating at 180 to 200°C for 3-5 h. Melting points of the polymers ranged from 148 to 423°C, depending on the length of the alkylene chain. Glass transition temperatures were relatively low, ranging from 50 to 100°C and did not show the pronounced odd/even effect noted for melting points. In all cases, rapid weight loss occurred above 400°C. No evidence for the formation of a molecular composite was observed in an attempt to prepare in situ a rod-like polybenzoxazole in a polyalkylenebenzoxazole.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760340411
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  • 2
    Electronic Resource
    Electronic Resource
    Fibers from aromatic copolyamides of limited orderPart XV in a series on New High Temperature Polymers. (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 3237-3244 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Fibers were spun from six different, wholly aromatic copolyamides of limited order. Tensile properties of the fibers were obtained at standard conditions and, for selected fibers, at elevated temperatures and after heat-aging at 300°C in air. The dry-heat shrinkage determined up to 400°C on selected fibers was relatively low; zero-strength temperatures ranged from 375°C to 495°C. Resistance to numerous chemical reagents was determined for one of the fibers and found to be comparable to that of the fibers from other wholly aromatic polyamides. Resistance to ultraviolet light appeared to be of the same order as that of unstabilized nylon 66.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070161215
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  • 3
    Electronic Resource
    Electronic Resource
    Polyisophthalamides with phenylthio pendent groups (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 1327-1333 
    Details
    ISSN: 0887-624X
    Keywords: aromatic polyamides ; polyisophthalamides ; phenylthio pendent groups ; 5-phenylthioisophthalic acid ; phosphorylation polycondensation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of polyisophthalamides containing pendent phenylthio groups was prepared from seven aromatic diamines and 5-phenylthioisophthalic acid by the phosphorylation polycondensation method. The properties of these polymers were compared with those of the analogous unmodified ones. The modified polymers exhibited better solubility in organic solvents than their unmodified counterparts. They also showed glass transition temperatures that were lower by approximately 30°C. However, the presence of the side groups did not bring about any substantial lowering of the thermal stability as measured by TGA. Other properties investigated were mechanical strength and water sorption.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300710
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and polycondensation of novel nitro-aromatic monomers: 4,4′-diamino-3′-nitrobenzanilide (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 873-877 
    Details
    ISSN: 0887-624X
    Keywords: 4,4′-diamino-3′-nitrobenzanilide (DNB) ; poly-p-benzamide (PBA) ; poly-p-benzamide end-capped with nitro-p-phenylenediamine ; polyterephthalamide of 4,4′-diamino-3′-nitrobenzanilide ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080330515
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  • 5
    Electronic Resource
    Electronic Resource
    Nematogenic block copolymers of rigid and flexible aromatic units. I. Synthesis and characterization (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 653-667 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Three types of wholly aromatic block copolymers were synthesized using the phosphorylation reactions of Yamazaki and Higashi. Each copolymer contained blocks of rigid and flexible units. The first copolymer, PBA/PABH-T, contains blocks of poly(p-benzamide) and the polyterephthalamide of p-aminobenzhydrazide. The second copolymer, PBA/MPD-I, contains blocks of poly(p-benzamide) and poly(p-phenylene isophthalamide), whereas the third, PPD T/MPD-I, contains blocks of poly(p-phenylene terephthalamide) and poly(m-phenylene isophthalamide). Three synthetic routes were used for the preparation of the block copolymers. In the two-step polycondensation (A), monomers of the flexible block are added to the rigid prepolymer. The multistep method (B) differs in that the rigid prepolymer is carboxy-terminated prior to addition of the monomers of the flexible block. Carboxy-terminated prepolymer of the rigid block is reacted with amine-terminated prepolymer of the flexible block in the two-pot condensation (C). The presence of a considerable amount of the flexible homopolymer is indicated by viscosity, extraction, and NMR studies, particularly when methods A and C were used. The flexible homopolymer can be extracted by using a nonsolvent for the rigid blocks. Extraction of the rigid homopolymer (which may also be presumed to be produced) entails a more elaborate procedure. In principle, one can use these methods to obtain pure block copolymer for study of mixtures with the rigid and flexible homopolymers. Phase studies of some of these systems will be reported in a following paper.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080250217
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  • 6
    Electronic Resource
    Electronic Resource
    Aromatic rigid chain copolymers. I. Synthesis, structure, and solubility of phenyl-substituted para-linked aromatic random copolyamides (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 1175-1195 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Four 2,5-biphenylene based difunctional condensation monomers, such as 2,5-diphenyldicar-boxylic acid or phenylterephthalic acid (PTA), 2,5-bis(carbonylimino-4-benzoic acid)biphenyl (2,5-BCIBABP), 2,5-diaminobiphenyl hydrochloride (2,5-DABP.HCl) and 2,5-bis(iminocarbonyl-4-benzoic acid)biphenyl (2,5-BICBABP), have been synthesized and characterized. These monomers were polymerized in combination with terephthalic acid (TA) and p-phenylenediamine (PPD) via the phosphorylation reaction to prepare a series of phenyl-substituted random copolyamides having all amide groups attached to para-positions of the benzene rings. All the copolyamides have been characterized by solubility, solution viscosity, and by differential scanning calorimetry (DSC). Some of these copolyamides have unusual solubility in organic solvents such as N,N-dimethylacetamide (DMAc) and N-methyl-2-pyrrolidinone (NMP) containing dissolved lithium chloride. A few copolyamides were tested for lyotropic behavior and found to form anisotropic solutions at critical concentrations in organic solvents. A randomly distributed unsymmetrical phenyl substituent on the benzene ring of para-oriented wholly aromatic polyamides dramatically changes the solubility and melting point. The phenyl substituent on a terephthalic acid unit is more efficient in decreasing melting point and increasing solubility in organic solvents of aromatic polyamides than the one on a p-phenylenediamine unit. However, the former also introduces a more flexible link in the extended polyamide chain.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080270407
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  • 7
    Electronic Resource
    Electronic Resource
    Nematogenic block copolymers of rigid and flexible aromatic units. IV. Synthesis by two-pot phosphorylation reactions (1989)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 27 (1989), S. 59-63 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1989.140270203
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  • 8
    Electronic Resource
    Electronic Resource
    Thermoplastic polyheterocycles. II: Polyalkylene-imidesPresented in part at the 25th anniversary meeting of the ACS Polymer Group of the North Carolina Section of the American Chemical Society, Chapel Hill, N.C., Nov. 12, 1992. (1994)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 34 (1994), S. 305-307 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polyalkylene-imides (i.e., aliphatic-aromatic polyimides) were prepared smoothly in N-methyl pyrollidone from straight chain aliphatic diamines and pyrromellitic dianhydride. Melting points of the polymers ranged from about 300 to 450°C, depending of the length of the alkylene chains. An odd/even effect related to the alkylene chain was noted for melting points and glass transition temperatures (Tg) of the polymers. The Tgs were relatively high, especially when compared to similarly structured polyalkylene-heterocycles, e.g., polyakylenebenzoxazoles.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760340412
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  • 9
    Electronic Resource
    Electronic Resource
    Rigid chain polymersPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Synthetic polymers with exceptional properties” in Bad Nauheim (W-Germany) on April 19/20, 1982. (1982)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 109 (1982), S. 1-19 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The history of rigid chain polymers (i.e., polymers that show mesogenic behavior either in the melt or in solution) is traced from its beginnings to the present. Some correlations between certain mesogenic structures and the physical properties of the corresponding polymers are drawn, particularly as they relate to fibers and to a lesser degree to films and molding resins. Some factors relating to the processing of rod-like polymers from thermotropic melts and from lyotropic solutions are dealt with, and some end use applications for rigid chain polymers are given.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1982.051090101
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  • 10
    Electronic Resource
    Electronic Resource
    High performance fibers from aromatic polymersPresented in part fit the International Symposium on Man-Made Fillers, Kalinin, USSR, May 1548, 1974. (1976)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 16 (1976), S. 298-302 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Examples are given to show how molecular structures may be synthesized to prepare polymers useful for the formation of fibers intended for specific end uses, particularly for high performance applications. Current trends and developments taken from the literature are reviewed and some new work from the laboratories of Monsanto Company is presented concerning the use of aromatic polymers for heat and flame resistant fibers. Some new polymers and new routes of synthesis are described. Correlations are made between flame resistance as measured by oxygen index (O.I.) values and the structure of a large number of aromatic polymers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760160504
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