Effects of topological constraint and knot entanglement on the crystal growth of polymers proved by growth rate of spherulite of cyclic polyethylene

Tsunaki Kitahara, Shinichi Yamazaki, Kunio Kimura

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In order to clarity tne effects ot entanglement species on nucleation ot polymers, we stuaiea tne growtn rate ot spneruute G of cyclic ana linear polyethylenes (C-PE and L-PE) from the melt as a function of degree of supercooling A T by means of polarizing optical microscope. We prepared several C-PEs with different weight average molecular weights M w=9300, 43600 and 86500, and L-PE with A/,=44000. G of all the sample were obeyed the equation, G = G 0 exp (-B/△T).BoîC-PE gradually increased with increasingM w. B is proportional to the surface free energy of the end surface of the nucleus, and this indicates that the regularity of folding surface increased with increasing M w. We consider that topological constraint of cyclic polymer becomes large with decreasing M., of the cyclic polymer. On the other hand, for C-PE and L-PE having almost the same M w (=44 k), G 0 of C-PE is much less than that of L-PE. Due to the topological constraint of cyclic polymer, we speculated that the adsorption mode on the crystal surface of C-PE is different than that of L-PE.

Original languageEnglish
Pages (from-to)694-701
Number of pages8
JournalKobunshi Ronbunshu
Volume68
Issue number10
DOIs
Publication statusPublished - Oct 2011

Fingerprint

spherulite
Polyethylene
Crystallization
Crystal growth
Polyethylenes
Polymers
polymer
crystal
supercooling
Supercooling
nucleation
Free energy
folding
Microscopes
Nucleation
Molecular weight
melt
adsorption
Adsorption
Crystals

Keywords

  • Cyclic polymer
  • Entanglement
  • Growth rate
  • Polyethylene
  • Spheruhte
  • Topology

ASJC Scopus subject areas

  • Polymers and Plastics
  • Environmental Science(all)
  • Materials Science (miscellaneous)
  • Chemical Engineering (miscellaneous)

Cite this

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title = "Effects of topological constraint and knot entanglement on the crystal growth of polymers proved by growth rate of spherulite of cyclic polyethylene",
abstract = "In order to clarity tne effects ot entanglement species on nucleation ot polymers, we stuaiea tne growtn rate ot spneruute G of cyclic ana linear polyethylenes (C-PE and L-PE) from the melt as a function of degree of supercooling A T by means of polarizing optical microscope. We prepared several C-PEs with different weight average molecular weights M w=9300, 43600 and 86500, and L-PE with A/,=44000. G of all the sample were obeyed the equation, G = G 0 exp (-B/△T).Bo{\^i}C-PE gradually increased with increasingM w. B is proportional to the surface free energy of the end surface of the nucleus, and this indicates that the regularity of folding surface increased with increasing M w. We consider that topological constraint of cyclic polymer becomes large with decreasing M., of the cyclic polymer. On the other hand, for C-PE and L-PE having almost the same M w (=44 k), G 0 of C-PE is much less than that of L-PE. Due to the topological constraint of cyclic polymer, we speculated that the adsorption mode on the crystal surface of C-PE is different than that of L-PE.",
keywords = "Cyclic polymer, Entanglement, Growth rate, Polyethylene, Spheruhte, Topology",
author = "Tsunaki Kitahara and Shinichi Yamazaki and Kunio Kimura",
year = "2011",
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pages = "694--701",
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T1 - Effects of topological constraint and knot entanglement on the crystal growth of polymers proved by growth rate of spherulite of cyclic polyethylene

AU - Kitahara, Tsunaki

AU - Yamazaki, Shinichi

AU - Kimura, Kunio

PY - 2011/10

Y1 - 2011/10

N2 - In order to clarity tne effects ot entanglement species on nucleation ot polymers, we stuaiea tne growtn rate ot spneruute G of cyclic ana linear polyethylenes (C-PE and L-PE) from the melt as a function of degree of supercooling A T by means of polarizing optical microscope. We prepared several C-PEs with different weight average molecular weights M w=9300, 43600 and 86500, and L-PE with A/,=44000. G of all the sample were obeyed the equation, G = G 0 exp (-B/△T).BoîC-PE gradually increased with increasingM w. B is proportional to the surface free energy of the end surface of the nucleus, and this indicates that the regularity of folding surface increased with increasing M w. We consider that topological constraint of cyclic polymer becomes large with decreasing M., of the cyclic polymer. On the other hand, for C-PE and L-PE having almost the same M w (=44 k), G 0 of C-PE is much less than that of L-PE. Due to the topological constraint of cyclic polymer, we speculated that the adsorption mode on the crystal surface of C-PE is different than that of L-PE.

AB - In order to clarity tne effects ot entanglement species on nucleation ot polymers, we stuaiea tne growtn rate ot spneruute G of cyclic ana linear polyethylenes (C-PE and L-PE) from the melt as a function of degree of supercooling A T by means of polarizing optical microscope. We prepared several C-PEs with different weight average molecular weights M w=9300, 43600 and 86500, and L-PE with A/,=44000. G of all the sample were obeyed the equation, G = G 0 exp (-B/△T).BoîC-PE gradually increased with increasingM w. B is proportional to the surface free energy of the end surface of the nucleus, and this indicates that the regularity of folding surface increased with increasing M w. We consider that topological constraint of cyclic polymer becomes large with decreasing M., of the cyclic polymer. On the other hand, for C-PE and L-PE having almost the same M w (=44 k), G 0 of C-PE is much less than that of L-PE. Due to the topological constraint of cyclic polymer, we speculated that the adsorption mode on the crystal surface of C-PE is different than that of L-PE.

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KW - Topology

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