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Journal of Adhesion Science and Technology, 2015

Structural alterations of polycarbonate/PBT by gamma
irradiation for high technology applications
M. F. Zakia,b, Elsayed K. Elmaghrabya 

and A. B. Elbasatyc


Experimental Nuclear Physics Department, Nuclear Research Center, Atomic Energy Authority, Cairo, Egypt;
Faculty of Medicine, Medical Physics Department, Jazan University, Jazan, Saudi Arabia; cFaculty of Industrial
Education, Physics Department, Helwan University, Cairo, Egypt

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In this work, polycarbonate/polybutylene terephthalate (PC/PBT)
was irradiated with different gamma doses ranging from 200 kGy to
1950 kGy. Structural alterations of irradiated PC/PBT polymer blend
have been studied using UV–vis spectroscopy, X-ray diffraction, and
Fourier transform infrared (FTIR), as well as surface wettability. The
results of UV–vis spectra showed that gamma irradiation induced
an increase in the optical absorption with an increase in the gamma
doses with shift in the optical absorption edge in the irradiated
samples toward the higher wavelength. This shift is correlated with
the decrease in optical band gap energy. Optical band gap decreases
up to 12 and 20% with respect to pristine sample for direct and
indirect transition, respectively. The number of carbon atoms per
conjugated length has been estimated. The α phase and β phase of
the crystalline PBT structure were observed. The α phase reflections
are slightly increased due to the irradiation but the accompanying α
to β transformation alters the results. FTIR investigation showed slight
variation in the absorption spectrum specially in the range from 1300
to 1001 cm−1 which are related to the O–C–O arrangements that is
found to be the most affected part of the molecule by irradiation.
A remarkable increase was observed in the wettability, surface free
energy, and adhesion work of irradiated samples with an increase in
the gamma doses.


Received 5 August 2015
Revised 26 September 2015
Accepted 5 October 2015

PC/PBT; gamma irradiation;
optical properties;
X-ray diffraction; FTIR
spectroscopy; surface

1. Introduction
The polymeric materials play an important role, due to their advantageous properties, in a
wide range of applications. Modifying the properties of polymers has become an important
goal in the global trend for use in industrial, medical, and engineering fields.[1] One of
these polymeric materials, known as Makroblend, which is the brand name of polycarbonate (PC) + polybutylene terephthalate (PBT), also known as PC/PBT. Makrofol PC is
a well-known polymer that currently belongs to solid-state nuclear track detectors.[2–6]
Makrofol production has become play an important role that interest to users in many

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