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Plazemska aktivacija poliestraVesel, Alenka ; Mozetič, Miran, 1961-Za polimerne materiale je znano, da imajo majhno površinsko energijo, ki je posledica nepolarnosti površine. Majhna površinska energija je vzrok za slabo oprijemljivost barvil, lepil, lakov, kovin in ... ostalih depozitov, zato v mnogih primerih oprijemljivost med polimerom in nanešeno površinsko prevleko ni zadostna. Tako površino je potrebno dodatno aktivirati, da izboljšamo adhezijo. To lahko dosežemo z različnimi postopki, med katerimi se je za najbolj primernega izkazala plazma. Hitrost potekanja procesov na površini je odvisna od parametrov razelektritve, kot so tlak, pretok reaktivnega plina, gostota razelektritvene moči, temperatura površine podlage itd. Raziskovali smo hitrost aktivacije površine poliestrske folije med izpostavo kisikovi plazmi in nevtralnim kisikovim atomom v odvisnosti od časa izpostave. Vzorci plastike so bili izpostavljeni za različno dolge čase od 0 do 15 s. Po izpostavi smo z merjenjem kota omočljivosti kaplice vode s podlago določili aktivnost površine. Meritve kota omočljivosti v odvisnosti od časa izpostave v plazmi so pokazale, da se spremembe, do katerih pride na površini vzorca, zgodijo izredno hitro, v manj kot 1 s. Z nadaljnjo izpostavo vzorca kisikovi plazmi, se stanje aktivacije ne spreminja. Preiskovali smo tudi odvisnost površinske energije polimera od doze atomarnega kisika. Ugotovili smo, da za popolno aktivacijo zadošča doza okoli 4x10[na]22 m[na]-3 okoli 0,2 ms.Source: Zbornik povzetkov (Str. 30)Type of material - conference contribution ; adult, seriousPublish date - 2001Language - slovenianCOBISS.SI-ID - 56034
Author
Vesel, Alenka |
Mozetič, Miran, 1961-
Topics
plazma |
polimer |
aktivacija površin |
omočljivost |
oprijemljivost
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Vesel, Alenka | 20048 |
Mozetič, Miran, 1961- | 10429 |
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