Abstract
Two-dimensional magic-angle-spinning (2D-MAS) NMR has been used to measure the orientation parameter, P2, of the diphenylene propane unit in bisphenol-A polycarbonate oriented by stretching to various extension ratios,λ, atT=295K andT= 403 K.P 2 is proportional to the birefringenceΔn, with a maximum birefringenceΔn 0= 0.189. There is some evidence that the order parameterP ″2 of the DPP units with respect to the chain axis deviates from unity.Δn 0 is therefore expected to be different from the birefringence,Δn 0 ′, of perfectly aligned chains of polycarbonate. The experimental results obtained forP 2(λ) are compared to those predicted by the aggregate model.
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Vogt, V.D., Dettenmaier, M., Spiess, H.W. et al. Orientation of the diphenylene propane unit in stretched polycarbonate from two-dimensional magic-angle-spinning NMR. Colloid & Polymer Sci 268, 22–27 (1990). https://doi.org/10.1007/BF01410418
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DOI: https://doi.org/10.1007/BF01410418