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Issue 5, 1999
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Chain folding in poly(ε-caprolactone) studied by small-angle X-ray scattering and Raman spectroscopy. A strategy for blending in the crystalline state

Abstract

Samples of poly(ε-caprolactone), including narrow fractions obtained by preparative gel permeation chromatography (GPC), were characterised by analytical GPC and 13 C NMR spectroscopy. The crystallised samples were investigated by small-angle X-ray scattering to obtain lamellar spacings and by low-frequency Raman spectroscopy to obtain LAM-1 frequencies. Together the two methods gave a reliable estimate of the critical stem length for chain folding in poly(ε-caprolactone) crystallised at room temperature or below, i.e. 15 chain units [CL, OCO(CH 2 ) 5 ] equivalent to 105 chain atoms. A necessary requirement for molecular blending of block copolymers of ε-caprolactone and ethylene oxide with crystalline high molar mass poly(ε-caprolactone) is cocrystallisation. Hence it was concluded that a safe lower limit for successful blending is a poly(ε-caprolactone) block of 20 CL units.

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Article type: Paper
DOI: 10.1039/A808718K
Citation: J. Mater. Chem., 1999,9, 1059-1063
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    Chain folding in poly(ε-caprolactone) studied by small-angle X-ray scattering and Raman spectroscopy. A strategy for blending in the crystalline state

    S. A. Berrill, F. Heatley, J. H. Collett, D. Attwood, C. Booth, J. Patrick A. Fairclough, A. J. Ryan, K. Viras, A. J. Dutton and R. S. Blundell, J. Mater. Chem., 1999, 9, 1059
    DOI: 10.1039/A808718K

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