New morphologies of polyacetylene from the precursor polymer polybenzvalene
Journal Article
·
· Journal of the American Chemical Society; (USA)
- California Institute of Technology, Pasadena (USA)
The synthesis and properties of the polymer polybenzvalene and its conversion to polyacetylene are presented. This conversion is performed by treating polybenzvalene with Lewis acidic catalysts. The highest quality material was obtained from the isomerization with HgCl{sub 2}. The polyacetylene (PA) produced by this precursor route has a morphology that is considerably more amorphous than other forms of polyacetylene that have been previously reported. Orientation of the precursor polymer by stretching induced crystallinity and chain alignment as determined by X-ray diffraction. The unoriented PA exhibited a conductivity of 1 {Omega}{sup {minus}1} cm{sup {minus}1} and I{sub 2} doping. Materials stretched to elongations of l/l{sub 0} = 2.3 and l/l{sub 0} = 6 displayed conductivities of 13 {Omega}{sup {minus}1} cm{sup {minus}1} and 49 {Omega}{sup {minus}1} cm{sup {minus}1}, respectively. Block copolymers of polynorbornene and polybenzvalene were produced. These copolymers exhibited no phase separation as determined by DSC. The isomerization of these materials produced a polyacetylene-polynorbornene copolymer which exhibits a dominant x-ray diffraction peak with a d spacing of 4.7 {angstrom}. These results indicate that the interchain spacing of the block copolymer is significantly greater than that of the polyacetylene homopolymer due to the intimate mixing of the polyacetylene with the polynorbornene.
- OSTI ID:
- 7072348
- Journal Information:
- Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 111:12; ISSN 0002-7863; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000* -- Chemistry
400201 -- Chemical & Physicochemical Properties
DATA
DATA ANALYSIS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
MORPHOLOGICAL CHANGES
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
POLYACETYLENES
POLYENES
POLYMERS
360603 -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000* -- Chemistry
400201 -- Chemical & Physicochemical Properties
DATA
DATA ANALYSIS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
MORPHOLOGICAL CHANGES
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
POLYACETYLENES
POLYENES
POLYMERS