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Effect of crosslinking density on the diffusion of antioxidant in XLPE matrices
Author(s) -
Sheu Kueiying,
Huang Samuel J.,
Johnson Julian F.
Publication year - 1989
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760290113
Subject(s) - diffusion , materials science , low density polyethylene , fourier transform infrared spectroscopy , polyethylene , pinhole (optics) , antioxidant , analytical chemistry (journal) , microbeam , polymer , polymer chemistry , composite material , chemical engineering , organic chemistry , optics , chemistry , thermodynamics , engineering , physics
A Fourier Transform Infrared spectrometer equipped with a microbeam accessary and a linear translation stage with a pinhole mask was used to monitor the diffusion of antioxidant in crosslinked polyethylene (XLPE) matrices crosslinked with controlled amounts of crosslinking agent. Integration of the peak area for a characteristic peak of the antioxidant at different positions along the sample indicated the changing concentration due to diffusion within 30 days. This technique allowed us to study an antioxidant with a molecular weight in the thousand range. The diffusion coefficients calculated were in the order of 10 −11 – 10 −10 cm 2 ·s −1 . It was observed that the diffusion constants dramatically changed with the crosslinking density.