Document Type

Journal Article

School

School of Engineering

RAS ID

25341

Funders

Edith Cowan University and the Ministry of Education and Training of Vietnam under the ECU-VIED join grant [grant number 23646]

Comments

This is an Author's Accepted Manuscript of:

La, L. B. T., Leatherday, C., Qin, P., Leong, Y.-K., Hayward, K. J., Jiang, B., & Zhang, L.-C. (2017). The interaction between encapsulated Gd2O3 particles and polymeric matrix: The mechanism of fracture and X-ray attenuation properties. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 535(Supplement C), 175-183.

https://doi.org/10.1016/j.colsurfa.2017.09.038

Abstract

This work sheds light on the relationship between the quantities of synthesized core shell Gd2O3 added to epoxy matrix and the mechanical and X-ray attenuation properties of particulate epoxy composite. Then, an optimal geometric design of non-lead based X-ray protective material with light weight per volume unit is prepared. A plateau with 28–30 % increments in the value of fracture toughness (KIC ) is observed with a specific addition of 0.08 – 0.1 volume fraction (φS) of Gd2O3 particles in pure epoxy. The same quantity of particles also optimally raises the critical strain energy release rate and Young ’ s modulus of epoxy by approximately 22 – 24 % and 18–25 % respectively. A 16 mm thick sheet of fabricated filled composite at (φS) of 0.08 and 0.1 can shield greater than 95 % and 99 % respectively of a primary X-ray beam in the range of 60 – 120 kVp. At the same X-ray attenuation (99 % attenuation), the specimen is 7, 8.5 and 16 times lighter than wood, glass, and concrete, respectively. At 0.5 mm Pb-equivalence, the composite also has 4.5 – 19.4 % less weight per unit area than current commercial non-lead products.

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