2.4. Instrumental analysis
Fourier transform infrared (FTIR) spectroscopy was used for
analyzing the changes of chemical structure. UHMWPE fibers were
mixed with KBr and pressed into pellets. The mixture was analyzed
with a Thermo Fisher Scientific Inc. Nicolet 6700 FTIR spectrometer.
The morphological observations were executed using a scanning
electron microscope (SEM) (TM3000, Hitachi High-Technologies
Co., Ltd.). In order to be observed more clearly and have better
conductivity, the surfaces of the specimens were sputter-coated
with gold prior to their observation.
Dynamic mechanical analysiswas performed with a DMAþ1000
dynamic measurement system (Metravib, France) using a constant
frequency of 10 Hz the specimens were heated at a rate of
5 C min1 from 80 to 0 C.