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Method for characterization of thermoplasticity elastic body shape change chalasis

A technology of thermoplastic elastomer and thermoplastic elasticity, which is applied in the direction of testing the ductility of materials, special data processing applications, instruments, etc., and can solve problems such as large gaps between curves and experimental data points

Inactive Publication Date: 2008-08-27
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the measured data of the compression deformation relaxation behavior of the PP modified SEBS elastomer material is fitted using the formula (1), it is found that the fitted curve is quite different from the experimental data points

Method used

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  • Method for characterization of thermoplasticity elastic body shape change chalasis
  • Method for characterization of thermoplasticity elastic body shape change chalasis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Embodiment 1: PP modified SEBS elastomer material

[0073] The two exponential decay functions in the mathematical software (see formula (2)) are fitted with the SEBS / PP compression set experimental data, and the results are shown in Figure 2. It can be seen from Figure 1 that the curve fitted according to formula (2) is in good agreement with the experimental data.

Embodiment 2

[0074] Embodiment 2: PP modified SEPS elastomer material

[0075] A large amount of experimental data obtained from the SEPS / PP deformation relaxation experiment was fitted to the mathematical model formula (Figure 3), and the fitted curve was in good agreement with the experimental data.

Embodiment 3

[0076] Embodiment 3: PP modified SBS elastomer material

[0077] The compression deformation relaxation experimental data of the SBS / PP elastomer material is fitted to the mathematical model formula (2), and the fitting curve shows that the experimental data curve and the formula fitting curve have a good degree of agreement (Figure 4).

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Abstract

The present invention relates to a characterization method for the deformation and relaxation of thermoplastic elastomer. The compression, deformation and relaxation behavior of plastics modification thermoplastic elastomer material are measured, i.e. a sample is placed in a compressor to be compressed for a certain time at normal temperature; after pressure is removed, tracking measurement is carried out to the deformation and relaxation conditions of the tested material; by analyzing and fitting a large amount of obtained experimental data, a mathematical model for the deformation and relaxation of the thermoplastic elastomer is built. The model can accurately describe the molecular chain relaxation behavior of thermoplastic elastomer and plastics modification thermoplastic elastomer material.

Description

technical field [0001] The invention relates to a characterization method for chemical material properties, in particular to a characterization method for establishing a mathematical model describing the movement of polymer molecular chains after a thermoplastic elastomer acts on an external force for a specific time. Background technique: [0002] The process of polymer movement is a relaxation process. Due to the frictional force of the motor unit when the polymer moves, it takes a long time for the molecules to reach a new equilibrium state that is compatible with the external conditions from an equilibrium state. Generally speaking, the relaxation process of polymer molecular segments follows an exponential relationship (see formula (1) below). This formula is a universal formula for describing the relaxation process of polymer chain segments. [0003] Δx(t)=Δx 0 · exp(-t / τ) (1) [0004] Where: Δx 0 : Indicates the length of the sample elongated by the external force...

Claims

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Application Information

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IPC IPC(8): G01N3/28G06F19/00
Inventor 王霞寇雪莹刘克家孙静
Owner SHANGHAI INST OF TECH
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