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  • 1
    Digitale Medien
    Digitale Medien
    Structure and properties of injection molded blends of liquid crystal polymer (40 PET/60 PHB) with poly(butylene terephthalate) (1996)
    Springer
    Mechanics of composite materials 32 (1996), S. 473-482 
    Details
    ISSN: 1573-8922
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Blends of a poly(butylene terephthalate) (PBT) and a liquid crystalline polymer (LCP) were prepared in a single screw extruder. The LCP used was a liquid crystalline copolyester of 40% polyethylene terephthalate with 60% p-hydroxybenzoic acid (40 PET/60 PHB). Specimens for mechanical testing were prepared by injection molding. Rheological, morphological, microstructural, and mechanical properties were investigated by capillary rheometry, polarized light microscopy, x-ray diffractometry, and a tensile tester, respectively. For the LCP content higher than 5 wt. % a significant decrease of the viscosity was noted. The morphology of the dispersed LCP phase varies between droplets and oriented fibrils. The degree of cystallinity of PBT and the crystal sizes were found to be affected by LCP addition. The tensile mechanical behavior of the PBT + LCP blends was also found to be affected by their compositions. The elasticity modulus and the parameter of elasticity anisotropy monotonically increase with the LCP content. The strain at break shows a drastic decrease for the blends containing more than 10 wt. % LCP. The long-term creep test shows that the creep compliance decreases noticeably when the LCP content increases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02313866
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  • 2
    Digitale Medien
    Digitale Medien
    A study on the mechanism of polymorphic transition β→α in isotactic polypropylenePart of this work has been presented at the Fourth Polish Crystallographic Symposium on Organic Crystal Chemistry, Poznań-Kiekrz, September 6-9, 1982. (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 2145-2151 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The analysis of the potential energy of the crystal lattice of isotactic polypropylene during the β→α phase transition was carried out. This transformation was realized by rotations and translations within a collection of 10 iPP helices. The lattice energy was calculated by means of the atom-atom potential method. Results and analysis of the data allow to propose a two-stage mechanism polymorphic transformation rotation of helices being the first stage. This mechanism is discussed in relation to physico-chemical conditions of the formation of the β-modification and also with regard to changes of certain physical properties observed in iPP during the β→α phase transition.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1985.021861018
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  • 3
    Digitale Medien
    Digitale Medien
    Molecular and crystal structure of bis(4-mercaptophenyl) sulfide as a model compound for poly(1,4-phenylene sulfide)Part of this work was presented at the IX International Symposium on Organic Sulfur Chemistry, Riga 1980. (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 2489-2495 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The molecular and crystal structure of bis(4-mercaptophenyl) sulfide (3) was determined by means of an X-ray diffraction analysis. The crystals are monoclinic, P21 /n with four molecules in the unit cell of the dimensions: a = 5,752 (1), b = 25,767 (9), c = 7,954 (2) Å and β = 95,2 (1)°. The structure was solved by direct methods and refined by least-squares techniques up to R = 0,075 for 1 280 independent reflections. The molecules of 3 do not have own symmetry and are arranged in the unit cell in chains along the 21 axes. Between sulfur atoms of neighbouring molecules hydrogen bonds are formed. From investigations of 3 and poly(1,4-phenylene sulfide) (2) at low temperatures (down to 90 K) similarities of changes in the crystal structures of both substances were evidenced.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1986.021871022
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  • 4
    Digitale Medien
    Digitale Medien
    Crystal and molecular structure of S,S-[sulfonylbis(1,4-phenylene)] di(thiobenzoate) as a model compound for the respective polymers (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 2033-2041 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The molecular and crystal structure of S,S-[sulfonylbis(1,4-phenylene)] di(thiobenzoate) (1) was determined from X-ray diffractometer data. The crystals are monoclinic, P21/a, with Z = 4 in the unit cell of the dimensions: a = 14,050 Å, b = 10,404 Å, c = 16,734 Å and β = 110,57°. The structure was resolved by direct methods and refined by least-squares techniques up to R = 0,049 for 2466 independent reflections. The molecules of 1 are asymmetric: the thiobenzoate substituents are syn and anti with relation to the central sulfonyl groups and the thiocarbonyl groups do not lie in the planes of the phenylene rings. Three aromatic rings are nearly perpendicular. From energetic calculations the possibility for a rotation around the S1 - C8 bond was evidenced. The results allow to explain the low crystallinity of the polymer consisting of 1 segments.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1984.021850923
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  • 5
    Digitale Medien
    Digitale Medien
    Polymerization of 1,3,5-trithiane in the solid state initiated by UV-irradiation. I. Polymerization conditions and polymer characterization (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 3151-3158 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The solid-state 1,3,5-trithiane polymerization initiated by UV-irradiation was studied at various irradiation times and various polymerization temperatures. The conversion of monomer to polymer reaches limiting values (at longest) in about 30 min of reaction. The apparent activation energy of this process is somewhat higher than in the chemically initiated polymerization. Generated by UV, active centers, which initiate the polymerization, are stable. On the basis of X-ray diffraction studies it was found that the prepared polythiomethylene has a hexagonal structure and high degree of crystallinity. In the polymer investigated, a new additional crystal phase is formed, which is not stable.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1988.080261202
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  • 6
    Digitale Medien
    Digitale Medien
    Structural analysis of an interphase region of isotactic polypropylene (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 34 (1994), S. 253-256 
    Details
    ISSN: 0959-8103
    Schlagwort(e): crystallographic polymorphism ; polypropylene ; SAXS ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Small-angle X-ray scattering (SAXS) data have been used to deduce the localization of organic additives in the bulk of isotactic polypropylene (iPP). The results have shown that changes in the thickness of a transition layer are not directly connected with the introduction of additives but with the content of the hexagonal β-form. This leads to the conclusion that the additives are placed in the amorphous phase in spite of their crucial influence on the formation of the crystalline phase of iPP.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pi.1994.210340303
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