Structurally different amorphous solids of isotactic poly(4-methyl-1-pentene) and an apparently press-working-induced amorphization

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Abstract

We have done press working of isotactic poly(4-methyl-1-pentene) (P4MP1) and carried out X-ray diffraction measurements of the pressed sheet at atmospheric pressure. The result shows an apparently pressure-induced amorphization, although the result will be partly due to the pressure gradient in the sample in the compression process. Separately from this measurement, we quenched the melted state of this polymer at atmospheric pressure and obtained an amorphous solid, and measured its X-ray diffraction at room temperature. Although the diffraction spectrum of this amorphous sample partially contained crystalline Bragg peaks, we found a difference between the diffraction spectra of quenched and pressed amorphous samples at the first peak height, which mirrors the difference between the diffraction spectra of low-density and high-density melt of the same polymer. We also suggest from the diffraction results that the crystalline state at room temperature contains high-density amorphous parts rather than low-density amorphous parts.

Original languageEnglish
Pages (from-to)28-31
Number of pages4
JournalJournal of Molecular Liquids
Volume200
Issue numberPA
DOIs
Publication statusPublished - 2014

Fingerprint

Amorphization
Diffraction
diffraction
Atmospheric pressure
Polymers
atmospheric pressure
Crystalline materials
X ray diffraction
Pressure gradient
polymers
room temperature
pressure gradients
poly(4-methyl-1-pentene)
x rays
Temperature
mirrors

Keywords

  • First sharp diffraction peak
  • High pressure
  • Intermediate range order
  • Polyamorphism
  • Polymer melt

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

Cite this

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title = "Structurally different amorphous solids of isotactic poly(4-methyl-1-pentene) and an apparently press-working-induced amorphization",
abstract = "We have done press working of isotactic poly(4-methyl-1-pentene) (P4MP1) and carried out X-ray diffraction measurements of the pressed sheet at atmospheric pressure. The result shows an apparently pressure-induced amorphization, although the result will be partly due to the pressure gradient in the sample in the compression process. Separately from this measurement, we quenched the melted state of this polymer at atmospheric pressure and obtained an amorphous solid, and measured its X-ray diffraction at room temperature. Although the diffraction spectrum of this amorphous sample partially contained crystalline Bragg peaks, we found a difference between the diffraction spectra of quenched and pressed amorphous samples at the first peak height, which mirrors the difference between the diffraction spectra of low-density and high-density melt of the same polymer. We also suggest from the diffraction results that the crystalline state at room temperature contains high-density amorphous parts rather than low-density amorphous parts.",
keywords = "First sharp diffraction peak, High pressure, Intermediate range order, Polyamorphism, Polymer melt",
author = "Ayano Chiba",
year = "2014",
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AU - Chiba, Ayano

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AB - We have done press working of isotactic poly(4-methyl-1-pentene) (P4MP1) and carried out X-ray diffraction measurements of the pressed sheet at atmospheric pressure. The result shows an apparently pressure-induced amorphization, although the result will be partly due to the pressure gradient in the sample in the compression process. Separately from this measurement, we quenched the melted state of this polymer at atmospheric pressure and obtained an amorphous solid, and measured its X-ray diffraction at room temperature. Although the diffraction spectrum of this amorphous sample partially contained crystalline Bragg peaks, we found a difference between the diffraction spectra of quenched and pressed amorphous samples at the first peak height, which mirrors the difference between the diffraction spectra of low-density and high-density melt of the same polymer. We also suggest from the diffraction results that the crystalline state at room temperature contains high-density amorphous parts rather than low-density amorphous parts.

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