MORPHOLOGY EVOLUTION IN PTFE AS A FUNCTION OF MELT TIME AND TEMPERATURE II. LOW MOLECULAR WEIGHT FOLDED CHAIN SINGLE CRYSTALS AND BAND STRUCTURES

J. Yang; P.H. Geil; T. C. Long; P. Xu

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MORPHOLOGY EVOLUTION IN PTFE AS A FUNCTION OF MELT TIME AND TEMPERATURE II. LOW MOLECULAR WEIGHT FOLDED CHAIN SINGLE CRYSTALS AND BAND STRUCTURES

Papers | Updated：2021-06-21

- MORPHOLOGY EVOLUTION IN PTFE AS A FUNCTION OF MELT TIME AND TEMPERATURE II. LOW MOLECULAR WEIGHT FOLDED CHAIN SINGLE CRYSTALS AND BAND STRUCTURES
- Vol. 23, Issue 2, Pages: 137-145(2005)
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- Published：20 March 2005
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J. Yang, P.H. Geil, T. C. Long, et al. MORPHOLOGY EVOLUTION IN PTFE AS A FUNCTION OF MELT TIME AND TEMPERATURE II. LOW MOLECULAR WEIGHT FOLDED CHAIN SINGLE CRYSTALS AND BAND STRUCTURES[J]. 2005, 23(2): 137-145.
DOI：

J. Yang, P.H. Geil, T. C. Long, et al. MORPHOLOGY EVOLUTION IN PTFE AS A FUNCTION OF MELT TIME AND TEMPERATURE II. LOW MOLECULAR WEIGHT FOLDED CHAIN SINGLE CRYSTALS AND BAND STRUCTURES[J]. 2005, 23(2): 137-145. DOI：

摘要

The effect of sintering dispersed and bulk

low molecular weight (Mn = 50

000 Da)

nano-emulsion polytetrafluoroethylene (PTFE) particles near their melting point is described. With the nascent particles consisting of ca. 75 nm diameter

hexagonal

single crystals

sintering at

e.g.

350℃

results

initially

in merger of neighboring particles

followed by individual molecular motion on the substrate and the formation of folded chain

lamellar single crystals and spherulites

and on-edge ribbons. It is suggested these structures develop

with time

in the mesomorphic “melt”. Sintering of the bulk resin yields extended chain

band structures

as well as folded chain lamellae; end-surface to end-surface merger

possibly by end-to-end polymerization

occurs with increasing time.

Abstract

The effect of sintering dispersed and bulk

low molecular weight (Mn = 50

000 Da)

nano-emulsion polytetrafluoroethylene (PTFE) particles near their melting point is described. With the nascent particles consisting of ca. 75 nm diameter

hexagonal

single crystals

sintering at

e.g.

350℃

results

initially

in merger of neighboring particles

followed by individual molecular motion on the substrate and the formation of folded chain

lamellar single crystals and spherulites

and on-edge ribbons. It is suggested these structures develop

with time

in the mesomorphic “melt”. Sintering of the bulk resin yields extended chain

band structures

as well as folded chain lamellae; end-surface to end-surface merger

possibly by end-to-end polymerization

occurs with increasing time.

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