Degradation behaviour of PLA-based polyesterurethanes under abiotic and biotic environments

Kucharczyk, Pavel; Pavelková, Alena; Stloukal, Petr; Sedlařík, Vladimír

doi:10.1016/j.polymdegradstab.2016.04.019

Cited by 38 publications

(23 citation statements)

References 45 publications

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“…Furthermore, as time went on, these absorption peaks of PLA molecule were gradually weakened, which indicates that the PLA molecules were degraded gradually and the number of PLA molecules in suture decreased with time. According to relevant literatures [49,50,51], the PLA molecule could be hydrolyzed into lactic acid (LA), and the LA could be further metabolized by the body.…”

Section: Resultsmentioning

confidence: 99%

Degradation Behavior In Vitro of Carbon Nanotubes (CNTs)/Poly(lactic acid) (PLA) Composite Suture

Liu

Chen

et al. 2019

Polymers

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Poly(lactic acid) (PLA) suture can be absorbed by the human body, and so have wide applications in modern surgery operations. The degradation period of PLA suture is expected to meet with the healing time of different types of wounds. In order to control the degradation period of the PLA suture, the carbon nanotubes (CNTs) were composited with PLA suture, and the degradation experiment in vitro was performed on sutures. The structure and properties of sutures during degradation, such as surface morphology, breaking strength, elongation, mass and chemical structure, were tracked and analyzed. The results indicated that the degradation brought about surface defects and resulted in 13.5 weeks for the strength valid time of the original PLA suture. By contrast, the strength valid time of the CNTs/PLA suture was increased to 26.6 weeks. Whilst the toughness of both the pure PLA and CNTs/PLA sutures decreased rapidly and almost disappeared after 3 to 4 weeks of degradation. The mass loss demonstrated that the time required for complete degradation of the two sutures was obviously different, the pure PLA suture 49 weeks, while CNTs/PLA sutures 63 to 73 weeks. The research proved that CNTs delayed PLA degradation and prolonged its strength valid time in degradation.

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Section: Resultsmentioning

confidence: 99%

Degradation Behavior In Vitro of Carbon Nanotubes (CNTs)/Poly(lactic acid) (PLA) Composite Suture

Liu

Chen

et al. 2019

Polymers

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“…Note here that, owing to the limited PUs solubility in common solvents [27] and the possible interactions of the as-obtained DOPO-PLA-PU with the SEC columns, resulting in truncated Mn value, no SEC analysis was realized. It is worth mentioning that the incorporation of urethane functions in the backbone of PLA macromolecule does not affect its compostability [28]. The resulting DOPO-PLA-PU produced is in the form of a transparent yellow material ( Figure 6).…”

Section: Synthesis and Properties Of Dopo-pla-pu By Chain Extensionmentioning

confidence: 99%

Development of Inherently Flame—Retardant Phosphorylated PLA by Combination of Ring-Opening Polymerization and Reactive Extrusion

et al. 2019

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In this study, a highly efficient flame-retardant bioplastic poly(lactide) was developed by covalently incorporating flame-retardant DOPO, that is, 9,10-dihydro-oxa-10-phosphaphenanthrene-10-oxide. To that end, a three-step strategy that combines the catalyzed ring-opening polymerization (ROP) of L,L-lactide (L,L-LA) in bulk from a pre-synthesized DOPO-diamine initiator, followed by bulk chain-coupling reaction by reactive extrusion of the so-obtained phosphorylated polylactide (PLA) oligomers (DOPO-PLA) with hexamethylene diisocyanate (HDI), is described. The flame retardancy of the phosphorylated PLA (DOPO-PLA-PU) was investigated by mass loss cone calorimetry and UL-94 tests. As compared with a commercially available PLA matrix, phosphorylated PLA shows superior flame-retardant properties, that is, (i) significant reduction of both the peak of heat release rate (pHRR) and total heat release (THR) by 35% and 36%, respectively, and (ii) V0 classification at UL-94 test. Comparisons between simple physical DOPO-diamine/PLA blends and a DOPO-PLA-PU material were also performed. The results evidenced the superior flame-retardant behavior of phosphorylated PLA obtained by a reactive pathway.

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“…Notably, the coupling agents for dental composites should prevent the hydrolytic deterioration of the interface and provide water‐resistant bonds to resist chemicals and corrosion during clinical application . Many materials, such as coupling agents, polylactide (PLA)‐based materials, ion‐dissociating HAp‐based materials, and other reinforcements associated with hydrogen‐bonding material, are susceptible to water‐based degradation; this review mainly focuses on the commonly used silane coupling agents, TCAs, and zirconate coupling agents.…”

Section: Modification Technologies To Improve the Matrix/filler Intermentioning

confidence: 99%

Dental Restorative Resin Composites: Modification Technologies for the Matrix/Filler Interface

Chen

Wang

et al. 2018

Macro Materials & Eng

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Dental restorative resin composites are a pivotal class of organic/inorganic hybrid materials. The main reasons for their failure are secondary caries and dental composite fractures, which prevent their long‐term service in posterior restorations. A remedy to these problems is improving the interfacial adhesion between the resin matrix and the fillers. Surface‐modified inorganic fillers show strong potential as more than just a bond between these two phases and can therefore be considered a medium to compensate for the deficits of dental composites. This paper mainly discusses strategies to improve the interfacial adhesion of dental composites, including surface treatments of fillers with coupling agents, polymers, and tetraethyl orthosilicate (TEOS) coatings, as well as the selection of porous fillers capable of micromechanical resin matrix/filler interlocking. Additionally, the existing deficiencies of these strategies and the prospects for dental composites are discussed.

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Degradation behaviour of PLA-based polyesterurethanes under abiotic and biotic environments

Cited by 38 publications

References 45 publications

Degradation Behavior In Vitro of Carbon Nanotubes (CNTs)/Poly(lactic acid) (PLA) Composite Suture

Degradation Behavior In Vitro of Carbon Nanotubes (CNTs)/Poly(lactic acid) (PLA) Composite Suture

Development of Inherently Flame—Retardant Phosphorylated PLA by Combination of Ring-Opening Polymerization and Reactive Extrusion

Dental Restorative Resin Composites: Modification Technologies for the Matrix/Filler Interface

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