Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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MECHANICAL PROPERTIES OF POROUS COMPOSITES BASED ON POLYHYDROXYBUTYRATE FILLED WITH HYDROXYAPATITE

Сherdyntsev V.V. 1 Senatov F.S. 1 Maksimkin A.B. 1 Chukov D.I. 1
1 National University of Science and Technology “MISIS”
Porous composite materials based on biodegradable polyhydroxybutyrate (PHB) and hydroxyapatite (HAP) were obtained by mechanical mixing and hot-pressing. Mechanical properties of materials were studied in tension and compression tests. Studies have shown that polymer nanocomposites of experimental samples PHB / HAP with the degree of filling up to 35% by weight have a high tensile strength - of more than 30 MPa. At high degrees of filling a brittle fracture of the material and the strength reduction were observed. Compressive strength is also greatly reduced in case of filling degree above 40% by weight of HAP. Compressive modulus of the composite PHB / HAP is smaller than modulus of bone, so it will not lead to growth of microstrain in bone-material border. Recommended degree of filling of biodegradable matrix PHB with bioactive HAP is 20% by weight. This degree of filling does not decrease the bioactivity and do not lead to a reduction in strength of the porous composite material.