Study on time-dependent surface properties of plasma treated polymer micro-fibers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F17%3A00314249" target="_blank" >RIV/68407700:21110/17:00314249 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.5185/eamc.2017" target="_blank" >http://dx.doi.org/10.5185/eamc.2017</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5185/eamc.2017" target="_blank" >10.5185/eamc.2017</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Study on time-dependent surface properties of plasma treated polymer micro-fibers

Popis výsledku v původním jazyce

This work focuses on surface modifications of polypropylene micro-fibers. The main goal is to eliminate general significant drawbacks of polymer fibers – smooth and chemically inert surfaces that do not allow a strong interaction forming with a matrix of composite materials, as pointed out in many studies. In order to enhance both, the chemical and physical interaction in an interface area, the coupled low-pressure oxygen plasma treatment of fibers was done. The plasma exposition time was equal to 10, 30, 60 and 240 seconds, total power of plasma device was 100 W. As a proper indicator of chemical changes on modified fiber surfaces, contact angles between fiber surfaces and demineralized water were measured by a direct optical method according to [3]. As a side research of the mentioned topic, a time-dependent deterioration of treated fiber wettability was examined. These measurements was accomplished four times – immediately after their treatment, after 1, 7 and 30 days. It was shown that the wettability of treated fibers was approximately two times higher if compared to reference ones. However, it should be emphasized that the enhanced wettability decreased to reference values in the time. Significant wettability diminution was apparent already after 1 day of exposition fibers to atmospheric conditions. The physical surface modification of treated fibers was observed by means of SEM analysis. The SEM images clearly showed the increase of the surface roughness on the treated fibers. To reveal a practical impact of conducted fiber modification, reference and plasma 30 seconds treated fibers were used as randomly dispersed and oriented reinforcement to cement composites (cement paste, water to cement ratio 0.4, samples having dimension equal to 40 x 40 x 160 mm) and then tested in four-point bending tests in order to find out the bending response as an indirect indicator of an interfacial shear strength between the two materials.

Název v anglickém jazyce

Study on time-dependent surface properties of plasma treated polymer micro-fibers

Popis výsledku anglicky

This work focuses on surface modifications of polypropylene micro-fibers. The main goal is to eliminate general significant drawbacks of polymer fibers – smooth and chemically inert surfaces that do not allow a strong interaction forming with a matrix of composite materials, as pointed out in many studies. In order to enhance both, the chemical and physical interaction in an interface area, the coupled low-pressure oxygen plasma treatment of fibers was done. The plasma exposition time was equal to 10, 30, 60 and 240 seconds, total power of plasma device was 100 W. As a proper indicator of chemical changes on modified fiber surfaces, contact angles between fiber surfaces and demineralized water were measured by a direct optical method according to [3]. As a side research of the mentioned topic, a time-dependent deterioration of treated fiber wettability was examined. These measurements was accomplished four times – immediately after their treatment, after 1, 7 and 30 days. It was shown that the wettability of treated fibers was approximately two times higher if compared to reference ones. However, it should be emphasized that the enhanced wettability decreased to reference values in the time. Significant wettability diminution was apparent already after 1 day of exposition fibers to atmospheric conditions. The physical surface modification of treated fibers was observed by means of SEM analysis. The SEM images clearly showed the increase of the surface roughness on the treated fibers. To reveal a practical impact of conducted fiber modification, reference and plasma 30 seconds treated fibers were used as randomly dispersed and oriented reinforcement to cement composites (cement paste, water to cement ratio 0.4, samples having dimension equal to 40 x 40 x 160 mm) and then tested in four-point bending tests in order to find out the bending response as an indirect indicator of an interfacial shear strength between the two materials.

Druh

O - Ostatní výsledky

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA15-12420S" target="_blank" >GA15-12420S: Modifikace povrchů polymerní a skleněné mikro-výztuže pro aplikace ve stavebnictví</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů