The Role of Crystallinity on Polymer Interaction with Oxygen Plasma

Junkar, Ita; Cvelbar, Uroš; Vesel, Alenka; Hauptman, Nina

doi:10.1002/ppap.200900034

Cited by 103 publications

(66 citation statements)

References 45 publications

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“…Junkar et al showed that amorphous PET was etched at a higher rate than semi-crystalline at the same conditions, so the formation of nanostructures of typical lateral dimension of almost 200 nm can be attributed to preferential etching of the amorphous phase. [33] These findings were confirmed also by DSC analysis, as plasma treated samples showed a higher crystalline content. Since the roughness did not increase substantially with increasing treatment time the etching selectivity using neutral particles found in the afterglow did not seem dramatic.…”

Section: Resultssupporting

confidence: 76%

“…The material is rapidly functionalized using oxygen-containing gaseous plasma created by different discharges. Although numerous authors have addressed the scientific issues on interaction of gaseous plasma with PET materials [33][34][35][36][37] the role of different reactive plasma particles in surface modification is still not well understood. A reason for a poor understanding of phenomena is that plasma contains a variety of particles capable of modification of PET surfaces and synergistic effects might play a dominant role.…”

Section: Introductionmentioning

confidence: 99%

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Modification of PET surface properties using extremely non-equilibrium oxygen plasma

2014

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Polyethylene terephthalate (PET) foils have been exposed to oxygen plasma and its afterglow in order to reveal compositional and structural modifications of the surface layer. Oxygen plasma was created by electrodeless RF discharge in a glass chamber so the O-atom density was close to 10 22 m -3 although the density of charged particles was only about 1 × 10 16 m -3 . Long-living reactive particles created in plasma were leaked into the afterglow chamber using a two-stage rotary pump of pumping speed 4.4 × 10 -3 m 3 s -1 . The density of O-atoms in the afterglow as measured with a catalytic probe was 3 × 10 21 m -3 , while the density of reactive oxygen molecules was estimated theoretically. The functionalization was accomplished even after a brief exposure to either plasma or afterglow since all samples were saturated with oxygen-rich functional groups as revealed by XPS. The water contact angle measurements, however, showed that only plasma treatment allowed for super-hydrophilicity, explained by rich surface morphology as detected by AFM. The differences in morphological properties between plasma and afterglow treated samples were explained by different interaction mechanisms between low and high energy particles impinging the polymer surface.

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Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Modification of PET surface properties using extremely non-equilibrium oxygen plasma

2014

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“…The morphological features further developed with prolonged treatment as the temperature of the samples increased. As explained elsewhere, prolonged treatment causes an increase in sample temperature reaching close to melting point; thus, small features tend to agglomerate to larger ones [22]. In Figure 4, we can observe that the size of the features was rather varied; from smaller, with diameter of less than 1 µ m after 10, 20 and 40 s of treatment, to larger, with diameters of a few µ m after 80 and 160 s of treatment-the lateral size of dots thus gradually increased with treatment time.…”

Section: Resultsmentioning

confidence: 99%

Endothelialization of Polyethylene Terephthalate Treated in SO2 Plasma Determined by the Degree of Material Cytotoxicity

Vesel¹,

Recek²,

Motaln³

2017

Plasma

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Improving the biocompatibility of polyethylene terephthalate (PET) vascular grafts is an important task for avoiding thrombus formation. Therefore, SO 2 plasma at various treatment periods were used to modify PET surface properties by forming sulfate functional groups. These groups were shown to act antithrombogenically, ensuring good hemocompatibility of the materials, although the biocompatibility of such materials still remains a mystery. For this reason, the adhesion and viability of HUVEC cells on SO 2 plasma-modified PET surfaces were studied, and the possible toxicity of the tested material was determined using two different assays, MTT (metabolic activity assay) and SRB (in-vitro toxicology assay). Changes in chemical composition, morphology and wettability were determined as well. Improved endothelialization was observed for all plasma-treated samples, with the most optimal being the sample treated for 80 s, which can be explained by it having the best combination of surface functionalization, roughness and morphology. Furthermore, toxicity was observed to some extent on the sample treated for 160 s, indicating the lowest cell density among the plasma-treated samples. X-ray photoelectron spectroscopy showed increased oxygen and sulfur content on the surface, which was independent on treatment time. Surface roughness of the plasma-treated samples increased, reaching its maximum after 80 s of treatment, and decreased thereafter.

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“…Namely, the interaction between neutral oxygen atoms and organic materials is extremely selective. It has to be pointed out that even chemically identical materials are etched at different rates upon exposure to oxygen plasma [84]. In the cited reference [84] major differences in the behaviour of PET polymer with different degrees of crystallinity were reported.…”

Section: Plasma Treatment Of Cellulose Wound Dressingmentioning

confidence: 99%