The effect of magnetic field and ionizing radiation on the mechanical properties of polymer blends consisting of high density polyethylene （HDPE） and acrylonitrile-butadiene rubber （NBR） has been investigated. The...The effect of magnetic field and ionizing radiation on the mechanical properties of polymer blends consisting of high density polyethylene （HDPE） and acrylonitrile-butadiene rubber （NBR） has been investigated. The purpose of the work was to create HDPE/NBR blend composites of significantly different compositions （with an excess of HDPE, intermediate ones, and with an excess of NBR） and to investigate the role of composition on mechanical deformation properties under the influence of magnetic field. The investigation has importance from the engineering viewpoint, since thermoplastic composite materials have been used as structural elements in thermonuclear and engineering fields, like wires, insulation materials and others, which are frequently subjected to mechanical loadings under the effect of magnetic field greater than 1 T. One part of the blends has been irradiated with 5 MeV accelerated electrons up to absorbed dose D equal to 150 kGy. Unirradiated and the radiation modified blends have been exposed to a constant magnetic field with induction B equal to 1.0 T, 1.5 T and 1.7 T. It is found that the action of magnetic field decreases the elastic modulus of unirradiated materials. Decrement of elastic modulus is reduced with increase of the content of NBR in composites. It is also found that preliminary irradiation noticeably decreases the effect of magnetic field. Data of the influence of the magnetic field, radiation cross-linking, and the ratio of the components on the creep are also obtained.展开更多
The thermal aging and scaling tests of Butadiene-acrylonitrile rubber （NBR） samples in alkaline solution were done, and after the tests, the surface contact angle of samples was measured and the sample surface was a...The thermal aging and scaling tests of Butadiene-acrylonitrile rubber （NBR） samples in alkaline solution were done, and after the tests, the surface contact angle of samples was measured and the sample surface was analyzed by infrared spectroscopy （IR）, X-ray photoelectron spectroscopy （XPS） and scanning electron microscopy （SEM）. The test results shows that after the NBR samples were dipped in pH 11, 70 ℃ alkaline solution for 215 d, many microcracks were observed on the surface and a lot of small sized scales existed near the cracks; element constituents of scale adhering on the surface were： Ca, Fe and A1, of which Ca was from saturated CaCO3, Fe was from rust scale and A1 was from A1203 ceramic existing also in the test environment; IR and XPS inspection indicate that there were outgrowths of carboxy group, acyloxy group, hydroxyl group, CaO and Ca3Si309, which showed that oxidation degradation and hydrolyzation happened on NBR and the scale appeared on the samples＇ surfaces. Dissolution, aging or scale adhesion led to non-uniformity of contact angle and surface energy data.展开更多
文摘The effect of magnetic field and ionizing radiation on the mechanical properties of polymer blends consisting of high density polyethylene （HDPE） and acrylonitrile-butadiene rubber （NBR） has been investigated. The purpose of the work was to create HDPE/NBR blend composites of significantly different compositions （with an excess of HDPE, intermediate ones, and with an excess of NBR） and to investigate the role of composition on mechanical deformation properties under the influence of magnetic field. The investigation has importance from the engineering viewpoint, since thermoplastic composite materials have been used as structural elements in thermonuclear and engineering fields, like wires, insulation materials and others, which are frequently subjected to mechanical loadings under the effect of magnetic field greater than 1 T. One part of the blends has been irradiated with 5 MeV accelerated electrons up to absorbed dose D equal to 150 kGy. Unirradiated and the radiation modified blends have been exposed to a constant magnetic field with induction B equal to 1.0 T, 1.5 T and 1.7 T. It is found that the action of magnetic field decreases the elastic modulus of unirradiated materials. Decrement of elastic modulus is reduced with increase of the content of NBR in composites. It is also found that preliminary irradiation noticeably decreases the effect of magnetic field. Data of the influence of the magnetic field, radiation cross-linking, and the ratio of the components on the creep are also obtained.
基金Supported by the Science and Technology Foundation of China National Petroleum Corporation (04B70303).
文摘The thermal aging and scaling tests of Butadiene-acrylonitrile rubber （NBR） samples in alkaline solution were done, and after the tests, the surface contact angle of samples was measured and the sample surface was analyzed by infrared spectroscopy （IR）, X-ray photoelectron spectroscopy （XPS） and scanning electron microscopy （SEM）. The test results shows that after the NBR samples were dipped in pH 11, 70 ℃ alkaline solution for 215 d, many microcracks were observed on the surface and a lot of small sized scales existed near the cracks; element constituents of scale adhering on the surface were： Ca, Fe and A1, of which Ca was from saturated CaCO3, Fe was from rust scale and A1 was from A1203 ceramic existing also in the test environment; IR and XPS inspection indicate that there were outgrowths of carboxy group, acyloxy group, hydroxyl group, CaO and Ca3Si309, which showed that oxidation degradation and hydrolyzation happened on NBR and the scale appeared on the samples＇ surfaces. Dissolution, aging or scale adhesion led to non-uniformity of contact angle and surface energy data.
