Deterioration analysis method

Patent metadata

Field	Value
Publication number	US-9638645-B2
Application number	US-201113881158-A
Country	US
Kind code	B2
Filing date	Aug 9, 2011
Priority date	Dec 16, 2010
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

The present invention provides deterioration analysis method which allows a detailed analysis of deterioration, especially deterioration of surface conditions, of a polymer material. The present invention relates to a deterioration analysis method, including irradiating a polymer material with high intensity X-rays, and measuring X-ray absorption while varying the energy of the X-rays, to analyze deterioration of the polymer.

First claim

The invention claimed is:

1. A deterioration analysis method, comprising
irradiating a polymer material with high intensity X-rays, and measuring X-ray absorption while varying the energy of the X-rays, to analyze deterioration of the polymer,
wherein the polymer material is a rubber material containing at least one diene rubber, or a composite material combining the rubber material and at least one resin,
an energy range scanned with the high intensity X-rays is 4000 eV or less,
the deterioration analysis method comprises: calculating normalization constants α and β using Equation 1 below based on X-ray absorption spectra obtained by scanning over a required range of high intensity X-ray energies at the carbon K-shell absorption edge within the range of 260 to 400 eV; performing waveform separation of the X-ray absorption spectra at the carbon K-shell absorption edge corrected with the normalization constants α and β to obtain peak areas attributed to π* transition at around 285 eV; and determining a degree of deterioration using Equation 2 below with the obtained peak areas:
[total area of X-ray absorption spectrum over measurement range of sample before deterioration]×α=1, and

[total area of X-ray absorption spectrum over measurement range of sample after deterioration]×β=1; and  (Equation 1)

[1−[(peak area of π* after deterioration)×β]/[(peak area of π* before deterioration)×α]]×100=degree (%) of deterioration.  (Equation 2)

2. The deterioration analysis method according to claim 1 ,
wherein peak intensities are used instead of the peak areas.

3. The deterioration analysis method according to claim 1 ,
wherein the high intensity X-rays have a number of photons of 10 7 (photons/s) or more and a brilliance of 10 10 (photons/s/mrad 2 /mm 2 /0.1% bw) or more.

4. The deterioration analysis method according to claim 2 ,
wherein the high intensity X-rays have a number of photons of 10 7 (photons/s) or more and a brilliance of 10 10 (photons/s/mrad 2 /mm 2 /0.1% bw) or more.

Assignees

• Kaneko Fusae
• Kishimoto Hiroyuki
• Sumitomo Rubber Ind

Inventors

• Kaneko Fusae
• Kishimoto Hiroyuki

Classifications

• G01N33/445

  Rubber · CPC title

• G01N23/063

  Physics · mapped topic

• G01N23/083

  the radiation being X-rays · CPC title

• G01N23/00 Primary

  Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 · CPC title

• G01N2223/627

  tyres · CPC title