Composite materials with improved properties in compression: Anionic polymerization of 1-methyl-1-silacyclopent-3-ene. Characterization of poly(1-methyl-1-sila-cis-pent-3-ene) by sup 1 H, sup 13 C, and sup 29 Si NMR spectroscopy and mechanism of polymerization
1-Methyl-1-silacyclopent-3-ene (I) undergoes anionic ring opening polymerization on treatment with n-butyllithium and hexamethylphosphoramide as cocatalysts in tetrahydrofuran to yield poly(1-methyl-1-sila-cis-pent-3-ene) (II). II has been characterized by infrared and {sup 1}H, {sup 13}C and {sup 29}Si nuclear magnetic resonance spectroscopy as well as by gel permeation chromatography, thermogravimetric analysis and elemental analysis. Due to the low molecular weight of II, {sup 1}H, {sup 13}C and {sup 29}Si NMR spectroscopy affords detailed information that permits characterization of microstructures involved in initiation and termination. End groups have been identified as substituted 1-methyl-1-silacyclopent-3-enes. The mechanism of this polymerization is discussed.
- Research Organization:
- University of Southern California, Los Angeles, CA (USA). Loker Hydrocarbon Research Inst.
- OSTI ID:
- 6950011
- Report Number(s):
- AD-A-221688/5/XAB
- Resource Relation:
- Other Information: Pub. in Macromolecules, Vol. 23, No. 7, 1915-1917(1990)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON 13
NUCLEAR MAGNETIC RESONANCE
POLYMERS
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
SILICON 29
AMIDES
ANIONS
CHROMATOGRAPHY
COMPOSITE MATERIALS
HYDRIDES
HYDROGEN
METHYL RADICALS
MICROSTRUCTURE
MOLECULAR WEIGHT
PHOSPHORS
POLYMERIZATION
RINGS
SILICON
SPECTROSCOPY
THERMAL GRAVIMETRIC ANALYSIS
ALKYL RADICALS
CARBON ISOTOPES
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
ELEMENTS
EVEN-ODD NUCLEI
GRAVIMETRIC ANALYSIS
HYDROGEN COMPOUNDS
IONS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
NONMETALS
NUCLEI
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
RADICALS
RESONANCE
SEMIMETALS
SEPARATION PROCESSES
SILICON ISOTOPES
STABLE ISOTOPES
THERMAL ANALYSIS
360601* - Other Materials- Preparation & Manufacture
400201 - Chemical & Physicochemical Properties