Deterioration analysis method

Patent metadata

Field	Value
Publication number	US-9915627-B2
Application number	US-201715462403-A
Country	US
Kind code	B2
Filing date	Mar 17, 2017
Priority date	Dec 16, 2010
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

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

What is 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:
performing waveform separation of an X-ray absorption spectrum at the oxygen K-shell absorption edge obtained by scanning over a range of high intensity X-ray energies of 500 to 600 eV; and
calculating contribution rates of oxygen deterioration and ozone deterioration using Equation 3 below, wherein the oxygen deterioration corresponds to a peak on the low energy side with a peak top energy in the range of 532 to 532.7 eV, and the ozone deterioration corresponds to a peak on the high energy side with a peak top energy in the range of 532.7 to 534 eV:
[peak area of oxygen deterioration]/[(peak area of ozone deterioration)+(peak area of oxygen deterioration)]×100=contribution rate (%) of oxygen deterioration,

and
[peak area of ozone deterioration]/[(peak area of ozone deterioration)+(peak area of oxygen deterioration)]×100=contribution rate (%) of ozone deterioration.   (Equation 3)

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

• Sumitomo Rubber Ind

Inventors

• Kaneko Fusae
• Kishimoto Hiroyuki

Classifications

• G01N2223/60

  Specific applications or type of materials · CPC title

• G01N23/063 Primary

  Physics · mapped topic

• G01N23/083

  the radiation being X-rays · CPC title

• G01N33/445

  Rubber · CPC title

• G01N2223/632

  residual life, life expectancy · CPC title