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  • 1
    Electronic Resource
    Electronic Resource
    Head-to-head vinyl polymers (1983)
    Springer
    Polymer bulletin 9 (1983), S. 355-360 
    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 The radical cyclopolymerization of N,N′-dimethyl-N,N′-dimethacrylurea (DMDMU) was investigated. The resulting polymer was completely soluble in benzene, and was found to compose of a seven-membered cyclized unit by means of IR and NMR spectra. This observation indicated that this cyclopolymerization was performed with alternating inter-and intra-molecular head-to-head (h-h) propagations, i.e. h-h cyclopolymerization mechanism to give a h-h cyclopolymer. When the cyclopolymer was heated, it was found to convert to a h-h cyclopolymer of N-methyl-N,N-dimethacrylamide(MDMA). The hydrolysis of the cyclopolymers of DMDMU and MDMA to h-h polymethacrylic derivatives was not succeeded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265313
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  • 2
    Electronic Resource
    Electronic Resource
    Cyclopolymerization of N-methacryloyl-N-methylcrotonamide (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 963-969 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: N-Methacryloyl-N-methylcrotonamide (MMCA) was prepared by the reaction of methacryloyl chloride with N-methylcrotonamide. While N,N-disubstituted methacrylamide and crotonamide, which can be considered as structual moieties of MMCA, do not homopolymerize, nevertheless MMCA yielded a homopolymer consisting of 5-membered cyclic repeating units. MMCA was found to be more reactive than N-propyldimethacrylamide in copolymerization with styrene and methyl methacrylate. Since the polymer radical adds to the methacrylamide moiety, the steric hindrance of a β-methyl group in the crotonamide moiety must be less significant than that of the α-methyl group of the methacrylamide moiety in the dimethacrylamide. The 5-membered ring formation during the polymerization of MMCA was facilitated by the favorable conformation of the three carbon atoms concerned in the ring closure to achieve coplanarity, which is required for the fast 5-membered ring closure. The coplanarity of the three carbon atoms and reluctance to homopolymerize of the reacting double bonds seem to be the minimum requirements for forming of a polymer consisting of solely 5-membered cyclic repeating units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830420
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  • 3
    Electronic Resource
    Electronic Resource
    Head-to-head vinyl polymers. XI. Preparation and characterization of poly(methyl acrylate) and poly(methyl methacrylate) consisting of head-to-head and head-to-tail units through cyclopolymerization of acrylic and methacrylic anhydrides (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 3503-3515 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acrylic anhydride (AAn) and methacrylic anhydride (MAAn) were polymerized with radical initiator in polar solvents at high temperatures. The polymers obtained were found to consist of five-and six-membered ring structures by comparing IR spectra of the polymers with those of model compounds, succinic anhydride, and glutaric anhydride. Hydrolysis and methylation of the polymers gave new polymers composed of head-to-head (HH) and head-to-tail (HT) methyl acrylate (MA) or methyl methacrylate (MMA) units. The content of HH unit of these HH/HT polymers was determined by 1H-NMR and 13C-NMR spectra. The softening, glass transition, and thermal degradation temperatures of the poly(MA) with HH and HT units were found to somewhat increase with increasing of the content of the HH units. On the other hand, the glass transition and thermal degradation temperatures of the poly(MMA) with HH and HT units increased similarly, but the softening temperature decreased as the content of the HH units increased.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170211212
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  • 4
    Electronic Resource
    Electronic Resource
    Head-to-head vinyl polymers. X. Cyclopolymerization of o-dimethacryloyloxybenzene (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 3169-3180 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: To clarify the possibility of preparing a polymer that contained head-to-head (h-h) methyl methacrylate (MMA) unit radical cyclopolymerization of o-dimethacryloyloxybenzene (o-DMB) was investigated. p-Dimethacryloyloxybenzene (p-DMB) was also used in comparison. When the polymerizations were carried out with higher monomer concentrations than ca. 0.5 mol/L, benzene-insoluble polymer was produced. The extent of cyclization (fc) in benzene-soluble polymer increased with a decrease in the monomer concentration and an increase in the polymerization temperature. The 1H-NMR and 13C-NMR spectra of poly(MMA) derived from poly(o-DMB) by hydrolysis and methylation were in fairly good agreement with those of ordinary head-to-tail (h-t) poly(MMA). Therefore, it was concluded that the intramolecular propagation in cyclopolymerization of o-DMB was mainly performed by a h-t mechanism. However, the initial and maximum degradation temperatures of the poly(MMA) were observed to be somewhat higher than those of the ordinary poly(MMA), which suggests that a minor amount of the h-h unit was formed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170211113
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  • 5
    Electronic Resource
    Electronic Resource
    Head-to-head vinyl polymers, 8Part 7: L. Quach, T. Otsu, J. Polym. Sci., Polym. Chem. Ed., in contribution. Preparation and characterization of new polymers composed of head-to-head and head-to-tail methoxycarbonylethylene units (1982)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 3 (1982), S. 193-197 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1982.030030402
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  • 6
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    Head-to-head vinyl polymers (1983)
    Springer
    Details
    Publication Date: 1983-01-01
    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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