Advantageous use of SSA technique to study of effects of thickness, antioxidant and

C. J. PÉREZ; M.D.FAILLA; J.M. CARELLA

THERMOCHIMICA ACTA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2012 vol. 538 p. 67 - 74

0040-6031

Information  obtained  from  successive  self-nucleation  and  annealing  (SSA)  technique  is  analyzed,  paying special attention to the observable effects of samples thickness and antioxidant and oxygen concentrations. Molecular structure changes for low density polyethylene (LDPE) samples, irradiated under three different atmospheres for doses between 33 and 222 kGy were analyzed, with emphasis on the changes of longer polymethylene crystallizable lengths. Antioxidant and oxygen concentrations were varied for samples  of  different  thickness  to  study  the  effects  on  degradation.  The  changes  in  the  molecular  structure were  followed  simultaneously  by  SSA  and  Infrared  spectroscopy  (FTIR)  via  carbonyl  group  concentration. Preliminary  quantifications  of  the  SSA  technique  sensitivity  are  also  advanced.