### 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 language | English |
---|---|

Pages (from-to) | 694-701 |

Number of pages | 8 |

Journal | Kobunshi Ronbunshu |

Volume | 68 |

Issue number | 10 |

DOIs | |

Publication status | Published - Oct 2011 |

### Fingerprint

### 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

**Effects of topological constraint and knot entanglement on the crystal growth of polymers proved by growth rate of spherulite of cyclic polyethylene.** / Kitahara, Tsunaki; Yamazaki, Shinichi; Kimura, Kunio.

Research output: Contribution to journal › Article

}

TY - JOUR

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.

KW - Cyclic polymer

KW - Entanglement

KW - Growth rate

KW - Polyethylene

KW - Spheruhte

KW - Topology

UR - http://www.scopus.com/inward/record.url?scp=82055169603&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=82055169603&partnerID=8YFLogxK

U2 - 10.1295/koron.68.694

DO - 10.1295/koron.68.694

M3 - Article

VL - 68

SP - 694

EP - 701

JO - Kobunshi Ronbunshu

JF - Kobunshi Ronbunshu

SN - 0386-2186

IS - 10

ER -