Degradation of poly(l-lactide) under CO2 laser treatment above the ablation threshold

Antończak, Arkadiusz J.; Stępak, Bogusz; Szustakiewicz, Konrad; Wójcik, Michał R.; Abramski, Krzysztof M.

doi:10.1016/j.polymdegradstab.2014.07.004

Cited by 29 publications

(29 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on obtained spectra, it is not possible to determine which thermal or photochemical process is dominant. At the same time, the observed changes are analogical to those obtained as a result of CO 2 laser treatment, and to the spectra of PLLA incubated through low fluence irradiation is a photochemical process [39,32]. A reason for obtaining similar alterations of chemical structure can be connected with the mechanism of thermal degradation of PLLA which is believed to proceed, among others, via the cis elimination reaction [44].…”

Section: Ir Spectroscopysupporting

confidence: 69%

“…It suggests that, due to high penetration depth~250 mm [18,32], the photodegradation has proceeded in the entire irradiated volume of PLLA samples, despite the ablation which occurred only at the surface. Otherwise, if the degradation occurred only within the top layer (close to the ablated zone), the M w distribution would be split into separated populations (bimodal distribution) which was observed in the case of the CO 2 laserinduced degradation of PLLA [39]. The increasing polydispersity PDI indicates an inhomogeneous character of modifications which is related to the dependence of the chain scission density on the intensity of light which decreases with depth into material according to the BeereLambert law.…”

Section: Molecular Weight and Polydispersitymentioning

confidence: 96%

See 1 more Smart Citation

Degradation of poly(l-lactide) under KrF excimer laser treatment

Stępak

Antończak

Szustakiewicz

et al. 2014

Polymer Degradation and Stability

Self Cite

View full text Add to dashboard Cite

Section: Ir Spectroscopysupporting

confidence: 69%

Section: Molecular Weight and Polydispersitymentioning

confidence: 96%

Degradation of poly(l-lactide) under KrF excimer laser treatment

Stępak

Antończak

Szustakiewicz

et al. 2014

Polymer Degradation and Stability

Self Cite

View full text Add to dashboard Cite

“…The process parameters enabling the highest cutting speed without HAZ formation for certain material thickness are collected in Table 1. A similar HAZ in PLLA connected with heat accumulation and caused by CO 2 or ArF excimer laser cutting was observed and characterized previously [6][7]. The HAZ visible in Fig.…”

supporting

confidence: 84%

Optimization of femtosecond laser cutting of biodegradable polymer for medical devices manufacturing

Stępak

Antończak

Abramski

2016

Photon. Lett. Poland

Self Cite

View full text Add to dashboard Cite

show abstract

“…Different types of laser treatment also lead to the significant degradation of biopolymers. Degradation of poly(L-lactide) under a CO 2 laser treatment above the ablation threshold was reported in [45], but ablation of the poly(L-lactide) by CO 2 laser did not affect the wettability of the surface of the material, which confirmed the lack of formation of polar functional groups. A different situation can be observed if excimer laser is used.…”

Section: Introductionmentioning

confidence: 66%

Wettability and Other Surface Properties of Modified Polymers

Kasálková¹,

Slepička²,

Kolská³

et al. 2015

Wetting and Wettability

View full text Add to dashboard Cite

Surface wettability is one of the crucial characteristics for determining of a material's use in specific application. Determination of wettability is based on the measurement of the material surface contact angle. Contact angle is the main parameter that characterizes the drop shape on the solid surface and is also one of the directly measurable properties of the phase interface. In this chapter, the wettability and its related properties of pristine and modified polymer foils will be described. The wettability depends on surface roughness and chemical composition. Changes of these parameters can adjust the values of contact angle and, therefore, wettability. In the case of pristine polymer materials, their wettability is unsuitable for a wide range of applications (such as tissue engineering, printing, and coating). Polymer surfaces can easily be modified by, e.g., plasma discharge, whereas the bulk properties remain unchanged. This modification leads to oxidation of the treated layer and creation of new chemical groups that mainly contain oxygen. Immediately after plasma treatment, the values of the contact angles of the modified polymer significantly decrease.In the case of a specific polymer, the strongly hydrophilic surface is created and leads to total spreading of the water drop. Wettability is strongly dependent on time from modification.Wettability plays a key role, e.g., in the development of biomaterials in tissue engineering and regenerative medicine. Biocompatibility tests of the cell adhesion, proliferation and viability are performed in an aqueous medium, and it is necessary to control the surface wettability. Various cell types have different requirements on surface properties, but while maintaining suitable parameters, the optimal value of © 2015 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.water contact angle for cell adhesion is in the interval of 50-70°. In the case of polymers, which have usually higher values of contact angles, the decrease in water contact angle and adjustment of the surface may be accomplished by introducing selected chemical groups (by plasma treatment), chemical compounds (by grafting, i.e., chemical bath deposition), or nanoparticles. In the case of grafting of polyethylene glycol (PEG) on the plasma activated high-density polyethylene was under "properly" selected conditions of modification (molecular weight of PEG, concentration of PEG in solution) prepared layers that positively influenced the cell adhesion. In addition, low concentration of gold nanoparticles increased the number of adhered cells without decreasing cell viability.Whether the surface of the polymeric substrate is attractive for the adhesion and proliferation of cells is determined not only by wettability but also by a range of other surface properties...

show abstract

Degradation of poly(l-lactide) under CO2 laser treatment above the ablation threshold

Cited by 29 publications

References 30 publications

Degradation of poly(l-lactide) under KrF excimer laser treatment

Degradation of poly(l-lactide) under KrF excimer laser treatment

Optimization of femtosecond laser cutting of biodegradable polymer for medical devices manufacturing

Wettability and Other Surface Properties of Modified Polymers

Contact Info

Product

Resources

About