ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Polysilanes  (2)
  • Springer  (2)
  • 1990-1994  (2)
  • 1955-1959
Collection
Keywords
Publisher
  • Springer  (2)
Years
  • 1990-1994  (2)
  • 1955-1959
Year
  • 1
    Electronic Resource
    Electronic Resource
    Blending, geldrawing and UV-photolysis of ultrahigh molecular weight polyethylene and poly(di-n-pentylsilylene) (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 554-562 
    Details
    ISSN: 1435-1536
    Keywords: Polysilanes ; geldrawing ; ultradrawn blends ; molecular orientation ; UV polarizers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Blending of drawable UHMW-PE with poly(di-n-pentylsilylene) by concurrent gel crystallization was performed and the resulting blends drawn to tapes of high strength and high modulus. As shown by electron microscopy, poly(di-n-pentylsilylene) could be dispersed as nanometer-sized domains in the UHMW-PE matrix and afterwards cooriented by ultradrawing. In the drawn tapes the crystallinity of the PE component was unaffected by blending. Polarized FTIR-spectroscopy demonstrated high orientation of both blend components. Corresponding UV-spectra showed local conformational changes of the polysilylene chains, as well as strong UV-dichroism. Intensive UV-radiation yielded selective decomposition of the polysilylene while the PE was little affected. Reactive intermediates resulted in the formation of Si-H groups which might be helpful to introduce chemical links between PE fibrils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657986
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Crystallization and mesomorphic disordering of di-n-hexylsilylene/di-n-pentylsilylene copolymers (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 442-448 
    Details
    ISSN: 1435-1536
    Keywords: Polysilanes ; di-n-alkylsilane copolymers ; isodimorphic crystallization ; thermochromism ; solid state NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A series of di-n-hexyl/di-n-pentylsilylene copolymers with monomodal molecular weight distribution have been prepared by Wurtz-coupling of dichlorosilanes using isooctane as a co-solvent. Crystallization and mesomorphic disordering were studied with regard to thermochromic effects and the silicon-chain conformation by DSC, MAS29Si-NMR, and UV-spectroscopy. The results show that the formation of a columnar mesomorphic phase is little affected by copolymerization of DHS and DPS units. Due to the preordering in the mesophase, three-dimensional ordering in the crystal is not hindered by topological constraints and isodimorphic mixed crystal formation was observed over the whole copolymer composition range. The predominantly all-trans structure, which is observed for crystalline poly(di-n-hexylsilylene), is maintained for copolymers containing up to 20%n-pentyl substituents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655880
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...