Effects of physical aging, crystallinity, and orientation on the enzymatic degradation of poly(lactic acid)

Cai, Hua; Davé, Vipul; Gross, Richard A.; McCarthy, Stephen P.

doi:10.1002/(sici)1099-0488(19961130)34:16<2701::aid-polb2>3.0.co;2-s

Cited by 264 publications

(220 citation statements)

References 3 publications

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“…For PLA in "amorphous" and "crystalline" state the filament was first heated above the melting point of PLA (about 430 K) [21] with subsequent cooling to room temperature at different rates. For the "crystalline" sample the cooling rate was 0.2 K/min [26]. To reach a maximum degree of crystalline phase, the sample was tempered for 10 min at 383 K. To receive a sample in the "amorphous" condition it has to be cooled at a rate greater than 10 K/min [21].…”

Section: Raw Materials and Materialsmentioning

confidence: 99%

“…A cold crystallization can only evolve if the possibility for a further crystallization is given. For the preparation of the present semicrystalline sample we used a cooling rate of approximately 0.2 K/min, starting at a temperature above the melting point, and a subsequent tempering process for 10 min at 383 K. This route allows reaching the maximum degree of crystallization in PLA, which is in the range of approximately 40% [26]. Thus, the semicrystalline sample exhibited only the glass transition and a double peak feature ( 1 ≈ 422 K and 2 ≈ 430 K) with an enthalpy of 33 J/g close to the melting point.…”

Section: Differential Scanning Calorimetry Of the Polymer Plamentioning

confidence: 99%

“…Ionic liquids are salts that are liquid at ambient temperatures offering beneficial properties, for example, low volatility and high-temperature stability [25]. When ionic liquids are used as plasticizers, the properties of a polymer can improve, compared to one with a common molecular plasticizer [24,26]. Moreover, the ionic nature of these liquids introduces charge carriers, enhancing the conductivity of polymers.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric Properties of 3D Printed Polylactic Acid

Dichtl

Sippel

Krohns

2017

Advances in Materials Science and Engineering

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3D printers constitute a fast-growing worldwide market. These printers are often employed in research and development fields related to engineering or architecture, especially for structural components or rapid prototyping. Recently, there is enormous progress in available materials for enhanced printing systems that allow additive manufacturing of complex functional products, like batteries or electronics. The polymer polylactic acid (PLA) plays an important role in fused filament fabrication, a technique used for commercially available low-budget 3D printers. This printing technology is an economical tool for the development of functional components or cases for electronics, for example, for lab purposes. Here we investigate if the material properties of “as-printed” PLA, which was fabricated by a commercially available 3D printer, are suitable to be used in electrical measurement setups or even as a functional material itself in electronic devices. For this reason, we conduct differential scanning calorimetry measurements and a thorough temperature and frequency-dependent analysis of its dielectric properties. These results are compared to partially crystalline and completely amorphous PLA, indicating that the dielectric properties of “as-printed” PLA are similar to the latter. Finally, we demonstrate that the conductivity of PLA can be enhanced by mixing it with the ionic liquid “trihexyl tetradecyl phosphonium decanoate.” This provides a route to tailor PLA for complex functional products produced by an economical fused filament fabrication.

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Section: Raw Materials and Materialsmentioning

confidence: 99%

Section: Differential Scanning Calorimetry Of the Polymer Plamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dielectric Properties of 3D Printed Polylactic Acid

Dichtl

Sippel

Krohns

2017

Advances in Materials Science and Engineering

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“…Due to its compostable characteristic, it has a high potential to be used in various applications (Vink et al 2003;Lima et al 2008). However, it has one disadvantage, that is, its brittleness, which makes it unsuitable as a structural component (Cai et al 1996;Pilla et al 2010). Recently, scientists have discovered its significant use as matrix for polymer composites.…”

Section: Introductionmentioning

confidence: 99%

Characterisation and Biodegradation of Poly(Lactic Acid) Blended with Oil Palm Biomass and Fertiliser for Bioplastic Fertiliser Composites

Saffian¹,

Abdan²,

Hassan³

et al. 2016

BioResources

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This work presents a new technique for producing a slow-release fertiliser with bioplastic polymer coating. Poly(lactic acid) (PLA) was blended with granular NPK fertiliser and empty fruit bunch (EFB) fibres using extrusion technique. The polymer coatings were characterised using thermal gravimetric analyser (TGA) and diffraction scanning calorimetry (DSC). The PLA and EFB fibres complemented each other in terms of their thermal stability in the BpF composites. A homogenous BpF blend was observed under a scanning electron microscope (SEM). In biodegradation the percentages of weight loss for PLA/EFB/NPKC1 and PLA/EFB/NPKC2 were higher due to the presence of EFB fibres, which were 64.3% and 76.3%, respectively.

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“…Indeed, amorphous polymers generally lead to the formation of smaller particles than crystalline copolymers, as the result of the higher mobility of the polymer chains during the preparation of self-assembled systems. Noteworthy, the microstructure (i.e., tacticity) of the copolymer highly impacts the physico-chemical properties of the resulting self-assembled system, in particular the drug release and degradation profile [181][182][183]. P(HB-co-HB R 11%) (with R = allyl or diOH, molar ratio (%)) with tunable tacticity (atactic, syndiotactic or isotactic), were used to form, by solvent precipitation or coprecipitation, L-Leuprolide-loaded microparticles with a Dh ranging from 10 to 100 µm, as assessed by SEM images [89].…”

Section: Preparation Methods and Characteristics Of Phb-based Micropamentioning

confidence: 99%

Advances in drug delivery systems based on synthetic poly(hydroxybutyrate) (co)polymers

Barouti

Jaffredo

Guillaume

2017

Progress in Polymer Science

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International audienceWithin the general context of nanomedicine, drug delivery systems based on polymers have sparkeda rapidly growing interest and raised many efforts to tackle various diseases, among which cancer.Polyester-based nanoparticulate drug delivery systems, including polymer-drug conjugates andamphiphilic block copolymers, represent a major class with promising outcomes, especially for thosederived from poly(3-hydroxybutyrate) (PHB). This review describes recent advances in drug delivery systemsdesigned from the self-assembly of synthetic (co)polymers derived from PHB. The various strategiesfor the synthesis of PHB-conjugates, PHB/poly(ethylene glycol) (PEG) and other PHB-based copolymersare first summarized. Nanoparticles, micelles, microparticles, and hydrogels elaborated from these(co)polymers following various preparation methods, along with their exploitation in the encapsulationand release of various therapeutic agents, are next detailed. Finally, we discuss the synthetic challenges,drug delivery outlooks, and perspectives of PHB-based drug delivery systems. Engineered nano-scaledmaterials based on PHB self-assembled systems are thus anticipated to emerge as a valuable platformfor original drug delivery systems

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Effects of physical aging, crystallinity, and orientation on the enzymatic degradation of poly(lactic acid)

Cited by 264 publications

References 3 publications

Dielectric Properties of 3D Printed Polylactic Acid

Dielectric Properties of 3D Printed Polylactic Acid

Characterisation and Biodegradation of Poly(Lactic Acid) Blended with Oil Palm Biomass and Fertiliser for Bioplastic Fertiliser Composites

Advances in drug delivery systems based on synthetic poly(hydroxybutyrate) (co)polymers

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