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  • 1
    Electronic Resource
    Electronic Resource
    Formation Mechanism of Poly(4'-oxy-4-biphenylcarbonyl) Crystals Obtained by Solution Polymerization (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 255-259 
    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/ma00105a033
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and formation mechanism of poly(oxycarbonyl-1,4-phenylene) whiskers from 4-acetoxybenzoic acid (1988)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 9 (1988), S. 687-691 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1988.030091003
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  • 3
    Electronic Resource
    Electronic Resource
    Epitaxial polymerization of acetylene (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1757-1764 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Epitaxial polymerization of acetylene was studied using systematic series of homologous isomorphic compounds as substrates for the purpose of establishing techniques for preparing well oriented polyacetylenes. From electron microscopy, it was confirmed that polyacetylenes grow on the substrate in the form of fibrils whose orientation is strongly dependent on the lattice matching between polyacetylene and substrate crystals: e.g. with naphthalene and anthracene as substrates the fibrils assume zigzag orientation in three specific directions on the crystal but with biphenyl and terphenyl the zigzag fibrils assume predominantly two specific directions. The mechanism of epitaxial growth during polymerization on the various substrates is discussed on the basis of the features of the epitaxial fibrils.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870719
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  • 4
    Electronic Resource
    Electronic Resource
    Copolymerization effect of m-acetoxybenzoic acid on morphology of poly(oxy-1,4-benzenediylcarbonyl) whiskers (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 739-745 
    Details
    ISSN: 0887-624X
    Keywords: poly(oxy-1,4-benzenediylcarbonyl) ; polymer whisker ; copolymerization ; needlelike crystals ; crystallization during polymerization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Copolymerizations of p-acetoxybenzoic acid (p-ABA) and m-acetoxybenzoic acid (m-ABA) were carried out in liquid paraffin at 330°C without stirring. Needlelike crystals are obtained when the content of m-ABA in the feed (χf) is in the range of 0-30 mol %. These needlelike crystals are inclined to show the fibrillation in both ends and the radial growth nature from the central part as χf increased. At higher χf than 40 mol %, crystals are not precipitated during polymerization. The content of m-oxybenzoyl units in the obtained whiskers (χw) are much lower than χf. The details of the polymerization and crystallization processes reveal that cooligomers containing more m-oxybenzoyl units cannot participate in the formation of needlelike crystals due to the higher solubility and the segregation effect of crystallization. The whiskers are predominantly formed by co-oligomers consisting almost entirely of p-oxybenzoyl units. © 1996 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Single crystals of amylose V complexes. III. Crystals with 81 helical configuration (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 9 (1971), S. 1471-1481 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Single crystals of amylose V complexes with the 81 helical configuration can be obtained from aqueous solutions of amylose by using α-naphthol as a complexing agent. Morphological observations suggest that the differences in crystallization behavior among the α-naphthol complex and other complexes with alcohols are due to differences in solubility of the complexes in water. Electron diffraction studies indicate a two-dimensional tetragonal unit cell with a = b = 22.9 Å. It is deduced that the space group providing a satisfactory arrangement of two helices is one of the enantiomorphs P41212 and P43212. From x-ray diffraction it was found that the c axis spacing of the α-naphthol complex is equivalent to that in 61 and 71 helical amylose crystals. Consequently, the geometry of the helical configuration requires an integral number of glucose residues per turn. The true helical diameters of the n-butanol, isopropanol, and α-naphthol complexes were calculated from experimental data. The ratio was 6:7:8 and indicated that the helix of the α-naphthol complex has eight glucose residues per turn. The diversity of helical configurations in V amylose crystals is discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.160090807
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  • 6
    Electronic Resource
    Electronic Resource
    Single crystals of amylose V complexes. II. Crystals with 71 helical configuration (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 4 (1966), S. 161-171 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It has been shown that lamellar crystals of amylose V complexes with 71 helical configuration can be obtained by using complexing agents larger in cross section than n-butanol. The electron diffraction studies indicated a new unit cell for the unheated lamellar crystals which are composed of molecules with 71 helical configuration and hold water molecules on the exterior of the helix. Furthermore, from a throughly dried specimen at 100°C. in vacuo we obtained a pattern which showed only three Debye rings. Its spacings were explained by a two-dimensional hexagonal unit cell having a = b = 14.7 A. proposed by Zaslow. It was also found that when the crystals were dispersed in methanol at room temperature, their electron diffraction pattern was the same as that of the anhydrous amylose V complex of n-butanol.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.160040201
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  • 7
    Electronic Resource
    Electronic Resource
    Single crystals of poly(ethylene terephthalate) (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 81-92 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Single crystals of poly(ethylene terephthalate) were prepared by evaporating the solvent slowly from dilute solution at crystallization temperature. The single crystals are parallelograms in shape and thicken by spiral growths with screw dislocations at their center. In the electron microscope they are seen to consist of platelets about 100 A. in thickness. Low-angle x-ray measurements on the film obtained by filtering the crystal suspension reveal a long spacing in good agreement with that calculated from shadow lengths. Electron and x-ray diffraction patterns show that the chain molecules are inclined at about 25-35° to the normal to the basal plane of the single crystals and sharply folded within the lamellae. Various morphological features and arrangement of the unit cell in the single crystal platelets are described and discussed.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030110
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  • 8
    Electronic Resource
    Electronic Resource
    Single crystals of amylose V complexes (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 3251-3260 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In the present paper our previous results and Manley's results for single crystals of amylose V complexes are confirmed. A reasonable interpretation of electron diffraction patterns from lamellar crystals of the monohydrated complex and of the anhydrous complex is presented. It is concluded that the longer side of rectangular lamellae corresponds to the a axis of the unit cell of the wet complex, and that the crystal structure does not have hexagonal symmetry at the time when the lamellar crystals are formed in the supercooled solution. The mode of chain packing in the single crystals is described and discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030919
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