6533b853fe1ef96bd12ad341
RESEARCH PRODUCT
Beiträge zur polymerisation von 2-isopropenylnaphthalin, 3. Anionische homopolymerisation von 2-isopropenylnaphthalin
Dieter EngelRolf C. Schulzsubject
chemistry.chemical_classificationGel permeation chromatographychemistry.chemical_compoundchemistryVirial coefficientIntrinsic viscosityPolymer chemistryButyllithiumPolymerGlass transitionTetrahydrofuranLight scatteringdescription
The anionic homopolymerization of 2-isoprenylnaphthalene with butyllithium in tetrahydrofuran at –78°C is described. The refractive index increment amounts to dn/dc = 0,2084 ml/g for these polymers in toluene at 25°C and wavelength λ = 436 nm. Determination of the molecular weights by light scattering yielded values between 13 000 and 270 000. The second virial coefficients also determined by light scattering measurements are comparable with the corresponding data of poly(α-methylstyrene). A calibration curve is given for gel permeation chromatography of the poly(2-isoprenylnaphthalene)s, whose polymolecularity indexes Mw/Mn lie between 1,06 and 1,2. Their intrinsic viscosity/molecular weight relationship is [η] = 1,43·10−2M0,663. From 1H NMR of the α-methyl group fractions of isotactic triads between 30 and 55% are evaluated. The glass transition temperature extrapolated to infinite molecular weight is Tg∞ = 221°C. Above 300°C fast degradation by monomer formation is observed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1981-11-01 | Die Makromolekulare Chemie |