Radiation induced oxidative degradation of polymers
- 1. Japan Atomic Energy Research Inst., Takasaki, Gunma. Takasaki Radiation Chemistry Research Establishment
Description
The degradation of polyethylene (PE) and ethylene-propylene copolymer (EPR) by γ-ray irradiation in oxygen under pressure was studied by gel fraction and swelling measurements. Irradiation in oxygen produced mainly chain scission, therefore the molecular weight decreased with dose. The G values of chain scission are 4 +- 0.5 for PE, and 1 approximately 2 for EPR. When the crosslinked PE and EPR are irradiated in oxygen, gel fraction decreases and swelling ratio increases with dose. A linear relation between the swelling ratio (Q) and the dose (R) is observed for EPR, that is, log[Q/Q0] = K.Qsup(3/2).R. With the addition of antioxidants, the relation still holds but the factor K is changed so the efficiency of antioxidants can be determined from the value of K
Additional details
Additional titles
- Subtitle (English)
- 2. Effects of radiation on swelling and gel fraction of polymers
Publishing Information
- Journal Title
- Radiat. Phys. Chem.
- Journal Volume
- 19
- Journal Issue
- 4
- Series
- Radiat. Phys. Chem.
- Journal Page Range
- 321-327
- ISSN
- 0146-5724
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- United Kingdom
- INIS RN
- 13691670
- Subject category
- S38: RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY;
- Descriptors DEI
- ANTIOXIDANTS; CHEMICAL RADIATION EFFECTS; COPOLYMERS; DECOMPOSITION; ENVIRONMENT; ETHYLENE; G VALUE; GAMMA RADIATION; GELS; MOLECULAR STRUCTURE; OXYGEN; POLYETHYLENES; PROPYLENE; RADIATION DOSES; SWELLING
- Descriptors DEC
- ALKENES; CHEMICAL REACTIONS; COLLOIDS; DEFORMATION; DISPERSIONS; ELECTROMAGNETIC RADIATION; ELEMENTS; HYDROCARBONS; IONIZING RADIATIONS; NONMETALS; ORGANIC COMPOUNDS; ORGANIC POLYMERS; POLYMERS; POLYOLEFINS; RADIATION EFFECTS; RADIATIONS