Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (4): 40202-040202.

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS •

### Effect of γ-ray irradiation on mechanical properties and crystallinity of ultra-high molecular weight polyethylene sheets

LI Jianxi1, SHAN Yongdong2, GU Jia2

1. 1 China General Nuclear Delta(Jiangsu) Plastic & Chemical Co., Ltd, Suzhou 215400, China;
2 China General Nuclear Delta(Suzhou) New Materials R & D Co., Ltd, Suzhou 215400, China
• Received:2016-01-25 Revised:2016-03-01 Online:2016-04-10 Published:2016-04-08

Abstract:

Background: Ultra-high molecular weight polyethylene(UHMWPE) is a kind of widely used engineering plastics due to its excellent physical and chemical properties. But it has the poor creep resistance. Purpose: The aim is to improve its creep resistance, environmental stress cracking and shape stability. Methods: The UHMWPE sheets were irradiated in air, water, methanol and ethanol at the dose rate of 2.5kGy·h-1 in the range of 0-200kGy. And the UHMWPE samples were tested and characterized by mechanical properties, gel content, differential scanning calorimetry(DSC) and infrared spectra. Results and Conclusion: The mechanical property test results revealed that the elongation at break of UHMWPE samples decreased obviously with the increasing of radiation dose. In water, methanol and ethanol, the elongation at break of UHMWPE samples also decreased with the increasing radiation dose, but the decrease degree was reduced, while the yield strength remained unchanged. DSC test results showed that the initial melting temperature, melting point and crystallinity of the UHMWPE samples decreased with the increasing absorbed dose in the air atmosphere, while increased in the atmosphere of water, methanol and ethanol. Infrared spectrum test results showed that the oxidation on the surface of the UHMWPE samples increased with the absorbed dose irradiated in the atmosphere of air, and in water, methanol and ethanol, the molecular chains of UHMWPE molecules generated double bond under radiation.

CLC Number:

• TL13