Issue 16, 1995

Dependence of the lamellar thickness of an extended-chain single crystal of polyethylene on the degree of supercooling and the pressure

Abstract

The dependence of the lamellar thickness (I) of an extended-chain single crystal (ECSC) of polyethylene (PE) crystallized at various pressures below or at the triple-point pressure (Ptri= 0.5 GPa) on the degree of super-cooling (ΔT) and the pressure have been studied. The value of I increased with the decrease in ΔT[i.e. increase in the crystallization temperature (Tc)] at a fixed pressure, similar to the well known ΔT dependence of I for a folded-chain single crystal (FCC). The observed maximum value of I, obtained at the lowest ΔT(Imax) increased with increasing pressure and the crystal changed from FCC to an extended-chain crystal (ECC) at ca. 0.25 GPa. Application of the chain-sliding diffusion theory, previously proposed by one of the authors (M.H.) was found to explain well observed significant ΔT dependence of I and the pressure dependence of Imax. It was proposed that the value of I is determined by the cessation of lamellar thickening growth at the phase transition from metastable hexagonal to stable orthorhombic. The phase transition was also studied and it is suggested to be a nucleation-controlled process of the primary nucleus.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans., 1995,91, 2573-2579

Dependence of the lamellar thickness of an extended-chain single crystal of polyethylene on the degree of supercooling and the pressure

M. Hikosaka, H. Okada, A. Toda, S. Rastogi and A. Keller, J. Chem. Soc., Faraday Trans., 1995, 91, 2573 DOI: 10.1039/FT9959102573

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements