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Mohd Radzali NA, Mohd Hidzir N, Abdul Rahman I, Mokhtar AK. Mechanical properties of polymeric biomaterials: Modified ePTFE using gamma irradiation. OPEN CHEM 2021. [DOI: 10.1515/chem-2021-0112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Evaluating the mechanical properties of expanded polytetrafluoroethylene (ePTFE) is essential to measure its resistance to permanent deformation from an applied force. These mechanical ePTFE properties must be comparable to the properties of real tissue. Various hydrophilic comonomers 2-hydroxyethyl methacrylate (HEMA), N-isopropylacrylamide (NIPAAM), and N-vinylcaprolactam were used individually for copolymerization with acrylic acid (AA) to be grafted onto ePTFE using the gamma irradiation-induced grafting method. After surface modification, the hydrophobic and mechanical properties of ePTFE were altered. The water uptake and contact angle measurement showed that the modified ePTFE was less hydrophobic (∼500%, θ < 90°) than the unmodified ePTFE (0%, θ = 140°). Moreover, the mechanical properties of ePTFE changed after the modification process due to the polymer grafted onto the ePTFE surface. The data from mechanical tests, such as Young’s modulus (74–121 MPa), ultimate tensile strength (5–9 MPa), and elongation at break (56–121%), obtained for the sample AA-co-HEMA and AA-co-NIPAAM remain within the ranges and are considered desirable for use as a biomaterial. The mechanical strength correlates well with the percentage of the grafting yield after the modification process and is dependent on the parameters used, such as irradiation dose and type of comonomer.
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Affiliation(s)
- Nur Ain Mohd Radzali
- Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia , 43600 Bangi , Selangor , Malaysia
- Nuclear Technology Research Centre, Faculty of Science and Technology, Universiti Kebangsaan Malaysia , 43600 Bangi , Selangor , Malaysia
| | - Norsyahidah Mohd Hidzir
- Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia , 43600 Bangi , Selangor , Malaysia
- Nuclear Technology Research Centre, Faculty of Science and Technology, Universiti Kebangsaan Malaysia , 43600 Bangi , Selangor , Malaysia
| | - Irman Abdul Rahman
- Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia , 43600 Bangi , Selangor , Malaysia
- Nuclear Technology Research Centre, Faculty of Science and Technology, Universiti Kebangsaan Malaysia , 43600 Bangi , Selangor , Malaysia
| | - Abdul Khaliq Mokhtar
- Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia , 43600 Bangi , Selangor , Malaysia
- Nuclear Technology Research Centre, Faculty of Science and Technology, Universiti Kebangsaan Malaysia , 43600 Bangi , Selangor , Malaysia
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