Degradable plasma polymer films with tailored hydrolysis behavior

Kousal, Jaroslav; Krtouš, Zdeněk; Rašková, Zuzana Kolářová; Sedlaříková, Jana; Schäfer, Jan; Kučerová, Liliana; Shelemin, Artem; Solař, Pavel; Hurajová, Anna; Biederman, Hynek; Lehocký, Marián

doi:10.1016/j.vacuum.2019.109062

Cited by 8 publications

(14 citation statements)

References 39 publications

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“…Besides, both employed characterisation techniques proved that especially at lower plasma powers, the original PLA ester structure was, at least partially, preserved. This is consistent with a previous study [ 25 ] where the PLA groups were confirmed by chemical hydrolysis in the films prepared both at low- and high-discharge power.…”

Section: Discussionsupporting

confidence: 93%

“…All NMR experiments were measured on PLA-like plasma polymer samples dissolved in deuterated chloroform CDCl 3 at room temperature and stirred for 2 h. Tetramethylsilane (TMS) was used as internal standard, and the NMR chemical shifts are reported in parts per million (ppm) in the scale relative to TMS peak (0.0 ppm). The solubility of the samples in chloroform was estimated using the procedure analogous to the procedure described in [ 25 ].…”

Section: Methodsmentioning

confidence: 99%

“…This generates a flux of both low- and high-molar mass species that are subsequently activated or fragmented by the plasma that initiates the polymerisation process. As was shown, e.g., by analyses of molar mass, swelling and composition, the final structure of such produced coatings may be tuned simply by the applied power from highly crosslinked one for high applied powers to the structure with partial preservation of the polymer chains present in the initial polymer at low powers [ 19 , 21 , 23 , 24 , 25 ]. In other words, this technique allows for the filling of the gap between the fully aperiodic plasma polymers synthesised by PECVD and polymers prepared by classic wet chemistry and thus to widen further the range of achievable functional properties of plasma polymers.…”

Section: Introductionmentioning

confidence: 99%

“…However, the relatively low retention of PLA-character was reported for such produced plasma polymer coatings that were characterised by O/C ratios lower than ~0.35, i.e., the value almost two times lower as compared to the original PLA, for which the O/C ratio is 0.66. More recently, the preliminary study indicated the possibility to increase the PLA character of prepared plasma polymer films when PAVTD is applied [ 25 ], however, no systematic study of the relation between the deposition parameters and chemical structure of fabricated PLA-like coatings was performed. Due to this fact, the main aim of this investigation was to provide a detailed characterisation of PAVTD deposition of PLA-like plasma polymers in dependence on the applied power.…”

Section: Introductionmentioning

confidence: 99%

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Structure of Plasma (re)Polymerized Polylactic Acid Films Fabricated by Plasma-Assisted Vapour Thermal Deposition

et al. 2021

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Plasma polymer films typically consist of very short fragments of the precursor molecules. That rather limits the applicability of most plasma polymerisation/plasma-enhanced chemical vapour deposition (PECVD) processes in cases where retention of longer molecular structures is desirable. Plasma-assisted vapour thermal deposition (PAVTD) circumvents this limitation by using a classical bulk polymer as a high molecular weight “precursor”. As a model polymer in this study, polylactic acid (PLA) has been used. The resulting PLA-like films were characterised mostly by X-ray photoelectron spectroscopy (XPS) and nuclear magnetic resonance (NMR) spectroscopy. The molecular structure of the films was found to be tunable in a broad range: from the structures very similar to bulk PLA polymer to structures that are more typical for films prepared using PECVD. In all cases, PLA-like groups are at least partially preserved. A simplified model of the PAVTD process chemistry was proposed and found to describe well the observed composition of the films. The structure of the PLA-like films demonstrates the ability of plasma-assisted vapour thermal deposition to bridge the typical gap between the classical and plasma polymers.

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Section: Discussionsupporting

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure of Plasma (re)Polymerized Polylactic Acid Films Fabricated by Plasma-Assisted Vapour Thermal Deposition

et al. 2021

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“…The advantage of this method is that the resulting plasma polymer is much more chemically similar to the classical polymer than films prepared by common vapor phase plasma polymerization. Moreover, the properties of the films are highly tunable by the plasma power which was demonstrated with polymers like polyimide [ 19 ], polyethylene [ 20 ], or polylactic acid [ 21 ]. Special interest has been paid to the poly(ethylene oxide) (PEO)-like films [ 22 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Degradable Poly(ethylene oxide)-Like Plasma Polymer Films Used for the Controlled Release of Nisin

et al. 2020

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Poly(ethylene oxide) (PEO)-like thin films were successfully prepared by plasma-assisted vapor thermal deposition (PAVTD). PEO powders with a molar weight (Mw) between 1500 g/mol and 600,000 g/mol were used as bulk precursors. The effect of Mw on the structural and surface properties was analyzed for PEO films prepared at a lower plasma power. Fourier transform (FTIR-ATR) spectroscopy showed that the molecular structure was well preserved regardless of the Mw of the precursors. The stronger impact of the process conditions (the presence/absence of plasma) was proved. Molecular weight polydispersity, as well as wettability, increased in the samples prepared at 5 W. The influence of deposition plasma power (0–30 W) on solubility and permeation properties was evaluated for a bulk precursor of Mw 1500 g/mol. The rate of thickness loss after immersion in water was found to be tunable in this way, with the films prepared at the highest plasma power showing higher stability. The effect of plasma power deposition conditions was also shown during the permeability study. Prepared PEO films were used as a cover, and permeation layers for biologically active nisin molecule and a controlled release of this bacteriocin into water was achieved.

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Effects of sliding velocity on microscratch responses of thermoplastics by Berkovich indenter

Liu

Wang

2022

Polym. Bull.

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Degradable plasma polymer films with tailored hydrolysis behavior

Cited by 8 publications

References 39 publications

Structure of Plasma (re)Polymerized Polylactic Acid Films Fabricated by Plasma-Assisted Vapour Thermal Deposition

Structure of Plasma (re)Polymerized Polylactic Acid Films Fabricated by Plasma-Assisted Vapour Thermal Deposition

Degradable Poly(ethylene oxide)-Like Plasma Polymer Films Used for the Controlled Release of Nisin

Effects of sliding velocity on microscratch responses of thermoplastics by Berkovich indenter

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