Method for determining glass-transition temperature of polymer film

A glass transition and polymer technology, applied in the investigation stage/state change, etc., to achieve good accuracy, good repeatability, and high sensitivity

Active Publication Date: 2013-11-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when studying the properties of polymers at the micro-nano scale, traditional research methods have revealed various deficiencies in sensitivity and accuracy.

Method used

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  • Method for determining glass-transition temperature of polymer film
  • Method for determining glass-transition temperature of polymer film
  • Method for determining glass-transition temperature of polymer film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The organic field effect transistor device is placed on the Keithley 4200 micro-operation probe station equipped with a hot stage, and the output curve of the source and drain current changes with temperature. The gate voltage is constant at -60V, and the source and drain voltage is constant at -45V. The source-drain current output curve of the organic field effect transistor in the heating process, the temperature corresponding to the turning point of the source-drain current output curve is the glass transition temperature of the polymer sample to be tested.

[0035] Wherein, the material constituting the polymer thin film layer of the organic field effect transistor is a polymer sample to be tested.

[0036] The structure diagram of the organic field effect transistor is shown in figure 1 shown. Wherein, 1 is the gate electrode (silicon wafer) with inorganic insulating layer (silicon dioxide), 2 is the polymer thin film layer (that is, the polymer sample to be teste...

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Abstract

The invention discloses a method for determining glass-transition temperature of a polymer film. The method comprises the following steps: taking a to-be determined polymer sample as a polymer film layer material constituting an organic field-effect transistor, heating the organic field-effect transistor under the conditions of constant grid voltage VG and constant source-drain voltage VSD, determining a source-drain current output curve of the organic field-effect transistor during heating, wherein the temperature corresponding to the turning point of the source-drain current output curve is the glass-transition temperature of the to-be determined polymer sample. The method is simple in operation and preparation technology, convenient and rapid in glass-transition temperature determination of the polymer film and ultrathin film, high in sensitivity and accuracy and good in reappearance.

Description

technical field [0001] The invention relates to a method for testing the glass transition temperature of an amorphous polymer film, in particular to a method for measuring the glass transition temperature of a polymer film. Background technique [0002] The glass transition temperature is an important physical parameter to characterize the polymer, the glass transition temperature (T g ), the physical properties of polymers (such as: heat capacity, thermal expansion coefficient, elastic modulus, etc.) change greatly, and the relationship between polymer structure and performance can be studied by studying the glass transition temperature. But the phenomenon of glass transition is very complicated, and there is still no relatively complete theory that can completely explain the experimental facts. From the perspective of molecular structure, the glass transition temperature refers to the temperature corresponding to the transition point of the polymer chain segment from "tha...

Claims

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Application Information

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IPC IPC(8): G01N25/12
Inventor 邵伟胡文平
Owner INST OF CHEM CHINESE ACAD OF SCI
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