What question did this study set out to answer?

To examine how impurity segregation and molecular weight fractionation influence the growth kinetics of spherulitic crystallization in polymer melts.

April 1, 1964Journal of Applied Physics

Spherulitic Crystallization from the Melt. II. Influence of Fractionation and Impurity Segregation on the Kinetics of Crystallization

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Authors

HKH. D. KeithAT&T (United States)FPF. J. PaddenAT&T (United States)

Discussion

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Implication

Experimental analysis demonstrates impurity segregation alters radial growth kinetics in polymer melts, indicating bulk melt transport processes govern spherulitic crystallization.

Key Points

To examine how impurity segregation and molecular weight fractionation influence the growth kinetics of spherulitic crystallization in polymer melts.
Measured spherulitic radial growth rates over a range of temperatures across several polymers.
Introduced varying proportions of impurity species exhibiting widely different molecular weights.
Variations in growth rate with molecular weight showed that transport processes extending into the melt from solid-liquid interfaces control growth kinetics.
Polymers containing very low molecular weight impurities exhibited parabolic radial growth [(radius) ∝ (time)½] instead of typical linear growth due to extended radial diffusion.
Conventional interface jump-process models proved inadequate for explaining the observed molecular weight dependence.

Cite This Study

Keith et al. (1964) studied this question.

synapsesocial.com/papers/6a1f06ca459b8c409ce6bf8d https://doi.org/10.1063/1.1713607

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Implication

Experimental analysis demonstrates impurity segregation alters radial growth kinetics in polymer melts, indicating bulk melt transport processes govern spherulitic crystallization.

Spherulitic Crystallization from the Melt. II. Influence of Fractionation and Impurity Segregation on the Kinetics of Crystallization

Discussion

Member takes

Implication

Key Points

Cite This Study

Spherulitic Crystallization from the Melt. II. Influence of Fractionation and Impurity Segregation on the Kinetics of Crystallization

Discussion

Member takes

Implication

Key Points

Cite This Study

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