In this paper

a temperature-strain curve tester for polymers by interval load method is introduced

which can accept parameters and collect data with the help of a personal computer. This equipment can be used in teaching work or research work to determine the linear or non-linear expanding behaviors of polymers

such as PMMA

to determine some characteristic temperature of polymers

such as T

g

and T

f

or to do some research work on molecular motion analysis and get the related parameters. By interval load method

the changes of strain of a certain sample in an interval can be detected

thus the differences between being compressed and uncompressed are obviously found out. So the errors of constant method due to the thermal expanding of equipment itself and creep of polymers can be ruled out and then more reliable data can be provided. Being given the parameters of heating rate and intelval load

the universality of this temperature-strain curve tester for polymers is considerable.