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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

20101 - Civil engineering

Project

<a href="/en/project/GA15-12420S" target="_blank" >GA15-12420S: Surface Treatment of Polymeric and Glass Micro-reinforcement in Civil Engineering Applications</a><br>

Continuities

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

Publication year

2017

Confidentiality

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