Diffusion and annealing in crystallizing polymers

Ultraviolet and fluorescent microscopy of additives in crystallizing polypropylene can be used to study the development of crystallinity within growing spherulites. As the spherulite forms, impurity species including fluorescent additives are initially rejected then subsequently diffuse back in. Sim...

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Bibliographic Details
Published in:Polymer (Guilford) 1982-01, Vol.23 (6), p.877-883
Main Authors: Ryan, T.G, Calvert, P.D
Format: Article
Language:English
Subjects:
additives
annealing
Crystallization
diffusion
impurities
spherulites
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Summary:Ultraviolet and fluorescent microscopy of additives in crystallizing polypropylene can be used to study the development of crystallinity within growing spherulites. As the spherulite forms, impurity species including fluorescent additives are initially rejected then subsequently diffuse back in. Simultaneously the interior of the spherulite is increasing in crystallinity and tending to push the impurities back towards the outside. The effect of these processes on the final distribution of impurities within the spherulite is calculated. These results suggest that non-uniformity in additive concentrations will have little impact on the stabilization of the polymer against photo-oxidation.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(82)90151-3