Deterioration analysis method

Patent metadata

Field	Value
Publication number	US-10145807-B2
Application number	US-201815880172-A
Country	US
Kind code	B2
Filing date	Jan 25, 2018
Priority date	Dec 16, 2010
Publication date	Dec 4, 2018
Grant date	Dec 4, 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

The invention claimed is:

1. A deterioration analysis method, comprising
irradiating a polymer material with high intensity X-rays; and
measuring X-ray absorption of the irradiated polymer material, while varying the energy of the X-rays to analyze deterioration of the polymer material,

wherein
the X-ray absorption is measured by producing an X-ray absorption spectrum that includes carbon and oxygen K-shell absorption peaks of the polymer material after deterioration and of same polymer material before deterioration,
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, and
the deterioration analysis method comprises: determining a normalization constant γ using Equation 4 below based on the X-ray absorption spectrum at the carbon K-shell absorption peak edge of the polymer material after deterioration; and correcting a total peak area of the oxygen K-shell absorption peak edge with the normalization constant γ based on Equation 5 below to determine the amount of oxygen and ozone bonded to the polymer material:
[total area of X-ray absorption spectrum at carbon K-shell absorption edge]×γ=1, and  (Equation 4)

[peak area of oxygen K-shell absorption edge]×γ=amount (index) of oxygen and ozone bonded.   (Equation 5)

2. 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.

Assignees

• Sumitomo Rubber Ind

Inventors

• Kaneko Fusae
• Kishimoto Hiroyuki

Classifications

• G01N23/085 Primary

  X-ray absorption fine structure [XAFS], e.g. extended XAFS [EXAFS] · CPC title

• G01N23/00

  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

• G01N33/445

  Rubber · CPC title

• G01N2223/627

  tyres · CPC title

• G01N23/083

  the radiation being X-rays · CPC title