Direct evidence of nucleation during the induction period of polyethylene crystallization by SAXS

Masamichi Hikosaka; Shinichi Yamazaki; Isao Wataoka; Narayan Ch Das; Kiyoka Okada; Akihiko Toda; Katsuaki Inoue

doi:10.1081/mb-120021610

Direct evidence of nucleation during the induction period of polyethylene crystallization by SAXS

Masamichi Hikosaka, Shinichi Yamazaki, Isao Wataoka, Narayan Ch Das, Kiyoka Okada, Akihiko Toda, Katsuaki Inoue

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

Direct evidence that nuclei are formed during the induction period of crystallization is obtained for the first time by means of small-angle X-ray scattering (SAXS). Polyethylene (PE) was used as a model crystalline polymer. The nucleating agent was mixed with PE in order to increase the scattering intensity I_x from nuclei as large as 10⁴ times bigger than usual. I_x increased soon after quenching to the crystallization temperature from the melt and saturated after some time. A new theory is proposed to estimate the size of the nuclei N, the number density distribution of nuclei with N at time t, f(t,N), and the induction time τ_i, by analyzing the SAXS scattering intensity. The volume-averaged size of the nuclei was nearly the same as that of critical nuclei and does not change so much with time during the induction period. Lamellae start stacking much later than nuclei start forming.

Original language	English
Pages (from-to)	847-865
Number of pages	19
Journal	Journal of Macromolecular Science - Physics
Volume	42 B
Issue number	3-4 SPEC.
DOIs	https://doi.org/10.1081/mb-120021610
Publication status	Published - Jan 1 2003
Externally published	Yes

Keywords

Degree of supercooling
Induction period
Nucleation
Nucleus
Polyethylene
Small-angle X-ray scattering

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Polymers and Plastics
Materials Chemistry

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Direct evidence of nucleation during the induction period of polyethylene crystallization by SAXS. / Hikosaka, Masamichi; Yamazaki, Shinichi; Wataoka, Isao; Das, Narayan Ch; Okada, Kiyoka; Toda, Akihiko; Inoue, Katsuaki.

In: Journal of Macromolecular Science - Physics, Vol. 42 B, No. 3-4 SPEC., 01.01.2003, p. 847-865.

Research output: Contribution to journal › Article › peer-review

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abstract = "Direct evidence that nuclei are formed during the induction period of crystallization is obtained for the first time by means of small-angle X-ray scattering (SAXS). Polyethylene (PE) was used as a model crystalline polymer. The nucleating agent was mixed with PE in order to increase the scattering intensity Ix from nuclei as large as 104 times bigger than usual. Ix increased soon after quenching to the crystallization temperature from the melt and saturated after some time. A new theory is proposed to estimate the size of the nuclei N, the number density distribution of nuclei with N at time t, f(t,N), and the induction time τi, by analyzing the SAXS scattering intensity. The volume-averaged size of the nuclei was nearly the same as that of critical nuclei and does not change so much with time during the induction period. Lamellae start stacking much later than nuclei start forming.",

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AU - Hikosaka, Masamichi

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AU - Wataoka, Isao

AU - Das, Narayan Ch

AU - Okada, Kiyoka

AU - Toda, Akihiko

AU - Inoue, Katsuaki

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