Patent AU-2021100393-A4 (AU)
Title: A Method and System for Detecting Conformational Transition Temperature of Polymer Films
Inventor: WEI DONGSHAN
IPC: G01N21/84
Filed: 2021-01-22
Granted: 2021-04-22
Abstract: The invention discloses a method and a system for detecting the conformational transition 
temperature of polymer films. The method comprises steps: preparation of polymer solution 
with set concentration; preparation of film samples by the polymer solution; measurement of 
the terahertz time-domain spectrum signal of temperature-controlled sample cell; placing the 
sample into the temperature-controlled sample cell, and then first measuring the terahertz time
domain spectral signals of the polymer film sample at different temperature points with a first 
preset temperature interval in a wide temperature range; first determining the transition 
temperature of the polymer film sample based on above-mentioned terahertz time-domain 
spectrum signal of temperature-controlled sample cell and the first measured terahertz time
domain spectrum signals of the polymer film sample; second measuring the terahertz time
domain spectral signal of the polymer film sample at different temperature points with a second 
preset and small temperature interval around the transition temperature determined by the 
above first measurement; second more accurately determining the conformational transition 
temperature of the polymer film sample based on the terahertz time-domain spectrum signal of 
the temperature-controlled sample cell and the second measured terahertz time-domain spectral 
signals of the polymer film sample. In the invention, the terahertz time-domain spectrum 
technology is used for detecting the conformational transition temperature of the polymer film, 
which has the advantages of rapidness, no label, simple operation, wide application range, good 
repeatability, high result accuracy and the like.
1 /3 
101 
Preparation ofpolymer solution with set concentration.  
102 
Preparation of film samples by the polymer solution.  
103 
Measurement ofthe terahertz time-domain spectrum signal ofthe 
temerature-controlled sample cell.  
Placing the sample into the temperature-controlled sample cell, and 104 
then first measuring the terahertz time-domain spectral signals of 
the polymer film sample at different temperature points xith a first 
preset temperature interval in a wide temperature range.  
First determining the transition temperature of the thin film sample 
based on above-mentioned terahertz time-domain spectrum signal of 105 
the temperature-controlled sample cell and the first measured 
terahertz time-domain spectral signals ofthe polymer film sample.  
Second measuring the terahertz time-domain spectral signal of 106 
the polymer film sample at different temperature points with a 
second preset and small temperature interval around the transition 
temperature determined by the abovefirstmeasurement.  
Second more accurately determining the conformational transition 
temperature ofthe polymer film sample based on the terahertz time- 107 
domain spectrum signal ofthe temperature-controlled sample cell 
and the second measured terahertz time-domain spectral signals of 
the polymer film sample.  
Figure 1 A flowchart of the method for detecting conformational transition temperature of 
polymer films in one embodiment of the present invention.  
0.15 
-- 50°C 
- 100°C 
0.10 - -- 150C: 
-0.05
0.00 
-0.05 
-0.101 
29 30 31 32 
Time [ps] 
Figure 2 Time-domain spectra of PVA film samples at different temperatures in an 
embodiment of the present invention.