Page 67 - 00. Complete Version - Progress Report IPEN 2014-2016

Application of Ionizing Radiations | Progress Report 67

acteristics as high impact and high tensile 2-methylanisole coupling and a final oxida-
stress were increased by irradiation process tion to achieve aluminum selectivity. The ob-
with absorbed doses between 50 kGy and 100 tained product was an aluminum selective
kGy from gamma and electron beam sources material where original membrane charac-
teristics (physical shape and mechanical re-
Ionizing Irradiation Applied to sistance) were conserved even after this ag-
Modification of Polymer Substrate gressive treatment.
from Biological Molecules

Olefinic polymers were modified by irradia-
tion process. Biological molecules as chitosan
were incorporated to the original polymeric
matrix and gave specific characteristics such
as antibacterial activity, capture of metal ions
and bio-material suitability for medical appli-
cations. The new polymeric material was also
developed with irradiation processes where Figure 33. Physical aspect of final product - aluminum selective
natural chitosan (from Brazilian coast alien membrane. (1) Styrene grafted PP-1, with high yield of grafting (not
chemically modified). (2) Chemically modified PP-1 (low yield - first
species Charybdis helleeri crabs) was used to step of modification). (3) Chemically modified PP-1 (high yields -
modify the base polymer. first step of modification and grafting). (4) Chemically modified PP-2
(high yield for the first modification and low yield of grafting).

Cure of inks, paints and varnishes
by UV/EB technology and
evaluation of its degradability
Figure 32. Chitosan
from Charybdis
helleeri crabs.

Creating Selective Membranes
with Ionizing Irradiation

Polymeric membranes were styrene grafted by
several irradiation methods and the obtained
material is chemically modified to become alu-
minum selective. For this purpose, polymeric
substrates like PVC (polyvinyl chloride) and
PP (polypropylene) were styrene grafted mu-
tually by gamma and electron beam irradia-
tion. The modification process included three
basic reaction paths: Friedel-Crafts acylation, Figure 34. Preparation of coating film and UV curing.