Structural changes in highly crosslinked polyethylene irradiated in absence of oxygen
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The heat properties of gamma-ray crosslinked polyethylene are determined by differential scanning calorimetry (DSC). The changes in the supermolecular structure are evaluated and correlated to the heterogeneous distribution of crosslinks in polymer structure caused by the specific early excitation process. The nonlinear change in enthalpy of fusion, peak melting temperature, activation energy of ordering transition, number of defects, and maximal specific heat capacity with absorbed dose is explained in terms of separated crosslinking processes, fast on the lamellae surfaces and slow in the crystal core at double bond site that is evident for absorbed dose greater than 1000 kGy. (C) 2003 Elsevier Science Ltd. All rights reserved.
Кључне речи:polyethylene / gamma-irradiation / crosslinking / supermolecular structure
Извор:Radiation Physics and Chemistry, 2003, 67, 3-4, 425-429
- 10th Tihany Symposium on Radiation Chemistry, Aug 31-Sep 05, 2002, Sopron, Hungary
ISSN: 0969-806X (print)