Influence of plasma treatment on the molar mass of poly(ethylene terephthalate) investigated by different chromatographic and spectroscopic methods

Weidner, Steffen M.; Kühn, Gerhard; Decker, Renate; Roessner, Dierk; Friedrich, Jörg

doi:10.1002/(sici)1099-0518(19980730)36:10<1639::aid-pola17>3.0.co;2-h

Cited by 46 publications

(8 citation statements)

References 3 publications

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Section: Molecular Mass Changesupporting

confidence: 60%

“…Oxygen plasma treatment also caused a more uniform decrease among both smaller and bigger polymer chains, whereas aminolysis induced more damage to molecules of smaller mass (Table 3, Figure 8a,b). A decrease in molecular weight after aminolysis and plasma treatment was observed by other authors [59,60]. In comparison to both of those methods, the surface activation with NaOH was much milder in its detrimental effect on the polymer's molecular weight when looking at the main chromatography peak (Figure 9a).…”

Section: Molecular Mass Changesupporting

confidence: 51%

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A Comparative Study of Three Approaches to Fibre’s Surface Functionalization

Dulnik

Jeznach

2022

JFB

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Polyester-based scaffolds are of research interest for the regeneration of a wide spectrum of tissues. However, there is a need to improve scaffold wettability and introduce bioactivity. Surface modification is a widely studied approach for improving scaffold performance and maintaining appropriate bulk properties. In this study, three methods to functionalize the surface of the poly(lactide-co-ε-caprolactone) PLCL fibres using gelatin immobilisation were compared. Hydrolysis, oxygen plasma treatment, and aminolysis were chosen as activation methods to introduce carboxyl (-COOH) and amino (-NH2) functional groups on the surface before gelatin immobilisation. To covalently attach the gelatin, carbodiimide coupling was chosen for hydrolysed and plasma-treated materials, and glutaraldehyde crosslinking was used in the case of the aminolysed samples. Materials after physical entrapment of gelatin and immobilisation using carbodiimide coupling without previous activation were prepared as controls. The difference in gelatin amount on the surface, impact on the fibres morphology, molecular weight, and mechanical properties were observed depending on the type of modification and applied parameters of activation. It was shown that hydrolysis influences the surface of the material the most, whereas plasma treatment and aminolysis have an effect on the whole volume of the material. Despite this difference, bulk mechanical properties were affected for all the approaches. All materials were completely hydrophilic after functionalization. Cytotoxicity was not recognized for any of the samples. Gelatin immobilisation resulted in improved L929 cell morphology with the best effect for samples activated with hydrolysis and plasma treatment. Our study indicates that the use of any surface activation method should be limited to the lowest concentration/reaction time that enables subsequent satisfactory functionalization and the decision should be based on a specific function that the final scaffold material has to perform.

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Section: Molecular Mass Changesupporting

confidence: 60%

Section: Molecular Mass Changesupporting

confidence: 51%

A Comparative Study of Three Approaches to Fibre’s Surface Functionalization

Dulnik

Jeznach

2022

JFB

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“…Researchers have speculated that ion-induced polymer chain scission and recombination lead to the formation of lowmolecular-weight (LMW) polymer chains at the polymer surfaces under plasma influences. [26][27][28][29] The highly mobile and volatile LMW polymer chains agglomerate to form threedimensional nanoscopic protrusions through a variety of surface dynamics, including migration, etching, and redeposition. 25 A thermodynamic driving force may also affect the agglomeration of LMW polymer chains by reducing the difference between the interface free energy of the modified polymer surface and that of the underlying, unmodified bulk polymer.…”

Section: Synthesis and Assembly Of Silica Nanoparticlesmentioning

confidence: 99%

Antireflective silica nanoparticle array directly deposited on flexible polymer substrates by chemical vapor deposition

et al. 2012

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We report the direct coating of a novel antireflective (AR) nanoarray structure of silica nanoparticles on highly flexible polymer substrates by a conventional vacuum coating method using plasma-enhanced chemical vapor deposition. Globular-shaped silica nanoparticles are found to be self-arranged in a periodic pattern on subwavelength scales without the use of artificial assemblies that typically require complicated nanolithography or solution-based nanoparticle fabrication approaches. Highly efficient AR characteristics in the visible spectral range are obtained at optimized refractive indices by controlling the dimensions and average distances of the silica nanoparticle arrays in a level accuracy of tens of nanometers. The AR nanoarrays exhibit sufficient structural durability against the very high strain levels that arise from the flexibility of polymer substrates. This simple coating process provides a cost-effective, high-throughput, room-temperature fabrication solution for producing large-area polymer substrates with AR characteristics.

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“…refs. [60,[104][105][106][107][108][109]) and PP [110]. According to Unger and co-workers [111], the phenyl rings in partially crystalline PET provide effective protection against plasma attack, compared for instance to polystyrene, for which the phenyl rings are on side chains.…”

Section: Surface Modification Of the Polymer Substratementioning

confidence: 99%

Durability of nanosized oxygen-barrier coatings on polymers

Leterrier

2003

Progress in Materials Science

467

341

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Research on silicon oxide thin films developed as gas-barrier protection for polymer-based components is reviewed, with attention paid to the relations between (i) coating defects, cohesive strength and internal stress state, and (ii) interfacial interactions and related adhesion to the substrate. The deposition process of the oxide from a vapor or a plasma phase leads in both cases to the formation of covalent bonds between the two materials, with high adhesion levels. The oxide coating contains nanoscopic defects and microscopic flaws, and their respective effect on the barrier performance and mechanical resistance of the coating is analyzed. Potential improvements are discussed, including the control of internal stresses in the coating during deposition. Controlled levels of compressive internal stresses in the coating are beneficial to both the barrier performance and the mechanical reliability of the coated polymer. An optimal coating thickness, with low oxygen permeation and high cohesive strength, is determined from experimental and theoretical analyses of the failure mechanisms of the coating under mechanical load. These investigations are found relevant to tailor the interactions and stress state in the interfacial region, in order to improve the reliability of the coating/substrate assembly. #

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Influence of plasma treatment on the molar mass of poly(ethylene terephthalate) investigated by different chromatographic and spectroscopic methods

Cited by 46 publications

References 3 publications

A Comparative Study of Three Approaches to Fibre’s Surface Functionalization

A Comparative Study of Three Approaches to Fibre’s Surface Functionalization

Antireflective silica nanoparticle array directly deposited on flexible polymer substrates by chemical vapor deposition

Durability of nanosized oxygen-barrier coatings on polymers

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