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  • Determination of orientational anisotropy in glassy solids by 2D dipolar spectra with sample flipping.

Determination of orientational anisotropy in glassy solids by 2D dipolar spectra with sample flipping.

Journal of magnetic resonance (San Diego, Calif. : 1997) (1997-11-14)
M Utz, J Eisenegger, U W Suter, R R Ernst
ABSTRACT

A method is proposed for the quantitative measurement of orientational anisotropy in glassy solids based on 2D dipolar NMR spectra with sample flipping (dipolar DECODER experiment). Purely dipolar spectra are obtained by chemical shift refocusing by a multiple pulse sequence. The experiment is applied to an investigation of a doubly 13C-labeled sample of bisphenol-A polycarbonate deformed in a channel-die apparatus. The orientational distribution function is determined by an expansion of the distribution in terms of spherical harmonics up to degree four.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Poly(Bisphenol A carbonate), melt index 10-12 g/10 min (300°C/1.2kg)
Sigma-Aldrich
Poly(Bisphenol A carbonate), average Mw ~45,000 by GPC
Supelco
Poly(Bisphenol A carbonate), analytical standard, molecular weight series
Supelco
Poly(Bisphenol A carbonate), analytical standard