Electro active textile fibers are key components in smart and interactive textile applications. I... more Electro active textile fibers are key components in smart and interactive textile applications. In our previous study, we produced poly (3, 4-ethylenedioxythiophene)(PEDOT) coat edviscose fibers by using oxidative chemical vapordeposition (OCVD) technique. We tried ...
ABSTRACT Abstract In this study, the influence of hydroxyapatite (HAp) and β-tricalcium phosphate... more ABSTRACT Abstract In this study, the influence of hydroxyapatite (HAp) and β-tricalcium phosphate (TCP) on the mechanical strength and the thermal degradation due to processing of PLLA and PLGA compounds were investigated. A twin screw micro-compounder is used to reinforce and blend PLA and PLGA granules with different dosage and particle size of HAp and β-TCP to produce smooth, homogenous profiles with sufficient mechanical strength and diameter sizes between 2-3.5 mm.
Health related issues, stringent environmental protection policies, search for cost effective and... more Health related issues, stringent environmental protection policies, search for cost effective and alternative materials, crave for renewability and sustainability and quest for high performance materials for structural applications give the motivation for research in ...
Http Dx Doi Org 10 1080 15428110208984736, Jun 4, 2010
In recent years the awareness of the problems caused by styrene emission during the processing of... more In recent years the awareness of the problems caused by styrene emission during the processing of unsaturated polyester resins has enlarged. The spray-up application of gel coats is especially problematic, and it produces high styrene emission rates. The emission of styrene has been reduced through material changes, work practice controls, and add-on controls. However, the influence of the spray-up process factors on styrene emission has not been studied before. The aim of this study was to examine possibilities to reduce styrene emission by optimization of spray-up process factors. The following factors were studied under controlled laboratory conditions: orifice size and angle of the spray gun tip, spraying pressure, distance between spray gun and mold, and shape of the mold. The influence of the rolling pattern during lamination was also studied. Several significant factors were found. High pressure and long spraying distance increased both the unit styrene emission and the emission rate. The orifice size had two effects; a large orifice decreased the amount of styrene emitted per sprayed amount of resin but increased the emission rate of styrene. The shape of the mold did not affect the styrene emission. Styrene emission is greater if the entire mold area is rolled. To achieve lower emission is it necessary to roll an area as small as possible; this is especially important if a large mold is laminated. The results showed that emission of styrene can be reduced significantly by an optimal selection of the spray gun settings and the way of working. Optimal settings also increased the transfer efficiency resulting in decreased material loss.
Electro active textile fibers are key components in smart and interactive textile applications. I... more Electro active textile fibers are key components in smart and interactive textile applications. In our previous study, we produced poly (3, 4-ethylenedioxythiophene)(PEDOT) coat edviscose fibers by using oxidative chemical vapordeposition (OCVD) technique. We tried ...
ABSTRACT Abstract In this study, the influence of hydroxyapatite (HAp) and β-tricalcium phosphate... more ABSTRACT Abstract In this study, the influence of hydroxyapatite (HAp) and β-tricalcium phosphate (TCP) on the mechanical strength and the thermal degradation due to processing of PLLA and PLGA compounds were investigated. A twin screw micro-compounder is used to reinforce and blend PLA and PLGA granules with different dosage and particle size of HAp and β-TCP to produce smooth, homogenous profiles with sufficient mechanical strength and diameter sizes between 2-3.5 mm.
Health related issues, stringent environmental protection policies, search for cost effective and... more Health related issues, stringent environmental protection policies, search for cost effective and alternative materials, crave for renewability and sustainability and quest for high performance materials for structural applications give the motivation for research in ...
Http Dx Doi Org 10 1080 15428110208984736, Jun 4, 2010
In recent years the awareness of the problems caused by styrene emission during the processing of... more In recent years the awareness of the problems caused by styrene emission during the processing of unsaturated polyester resins has enlarged. The spray-up application of gel coats is especially problematic, and it produces high styrene emission rates. The emission of styrene has been reduced through material changes, work practice controls, and add-on controls. However, the influence of the spray-up process factors on styrene emission has not been studied before. The aim of this study was to examine possibilities to reduce styrene emission by optimization of spray-up process factors. The following factors were studied under controlled laboratory conditions: orifice size and angle of the spray gun tip, spraying pressure, distance between spray gun and mold, and shape of the mold. The influence of the rolling pattern during lamination was also studied. Several significant factors were found. High pressure and long spraying distance increased both the unit styrene emission and the emission rate. The orifice size had two effects; a large orifice decreased the amount of styrene emitted per sprayed amount of resin but increased the emission rate of styrene. The shape of the mold did not affect the styrene emission. Styrene emission is greater if the entire mold area is rolled. To achieve lower emission is it necessary to roll an area as small as possible; this is especially important if a large mold is laminated. The results showed that emission of styrene can be reduced significantly by an optimal selection of the spray gun settings and the way of working. Optimal settings also increased the transfer efficiency resulting in decreased material loss.
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Papers by Mikael Skrifvars