Phase-structure and mechanical properties of isothermally melt-and cold-crystallized poly (L-lactide)

Lizundia, Erlantz; Petisco-Ferrero, S.; Sarasua, Jose‐Ramon

doi:10.1016/j.jmbbm.2012.09.006

Cited by 87 publications

(80 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This integrity is mainly due to the occurring strong cellulosic inter-and intramolecular interactions within the closely packed nanocrystalline network. A similar behaviour has been previously found for heat-treated polylactides, where the crystalline regions prompt to smaller E drop at T g as a result of the increased chain-stiffness provided by crystalline domains (Lizundia et al, 2013). This increased thermal and mechanical stability of CNC/ZnO films in regard to commonly utilized synthetic polymers highlights the bright future of those materials for high temperature applications.…”

Section: Dynamic Mechanical Analysis (Dma)supporting

confidence: 81%

“…The fact that the abrupt decrease on the mechanical performance at T g typically found in polymeric systems, where E modulus could decrease up to 500 times (Lizundia et al, 2013), is not observed for synthesized CNC/ZnO nanopapers, together with the achieved significantly low tan ı values achieved when compared with petro-based polymers (typical values found between 1 and 3) provide an evidence about the high structural integrity of cellulose nanopaper over the −125 to 225 • C temperature range. This integrity is mainly due to the occurring strong cellulosic inter-and intramolecular interactions within the closely packed nanocrystalline network.…”

Section: Dynamic Mechanical Analysis (Dma)mentioning

confidence: 80%

“…where Z ave is the average Z value whithin the analyzed area, N is the number of points, Z i is the current Z value and Z cp is the Z value of the centre plane (Lizundia, Petisco, & Sarasua, 2013). All images (800 × 800 nm 2 ) reveal a disordered isotropic arrangement of cellulose nanocrystals irrespectively of the ZnO concentration.…”

Section: Physicochemical Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Increased functional properties and thermal stability of flexible cellulose nanocrystal/ZnO films

Lizundia

Urruchi

Vilas

et al. 2016

Carbohydrate Polymers

View full text Add to dashboard Cite

Section: Dynamic Mechanical Analysis (Dma)supporting

confidence: 81%

Section: Dynamic Mechanical Analysis (Dma)mentioning

confidence: 80%

Section: Physicochemical Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Increased functional properties and thermal stability of flexible cellulose nanocrystal/ZnO films

Lizundia

Urruchi

Vilas

et al. 2016

Carbohydrate Polymers

View full text Add to dashboard Cite

“…respectively. R q and R a surface roughness parameters, which quantitatively determine the average vertical deviation of the surface profile from the center plane, [40] are included.…”

Section: Morphological Characterizationmentioning

confidence: 99%

PLLA/ZnO nanocomposites: Dynamic surfaces to harness cell differentiation

Trujillo

Lizundia

Vilas

et al. 2016

Colloids and Surfaces B: Biointerfaces

Self Cite

View full text Add to dashboard Cite

Graphical abstract2 Highlights  Biodegradable poly(L-lactide) matrix loaded with ZnO nanorods. Dynamic presentation of nanorods triggered by PLLA degradation. Changes in surface properties as a function of time control cell behaviour. Nanorods exposure promotes cell differentiation.3 Keywords: PLLA, ZnO nanoparticle, C2C12 myoblast, nanocomposite, cell differentiation AbstractThis work investigates the effect of the sequential availability of ZnO nanoparticles, (nanorods of ~ 20 nm) loaded within a degradable poly(lactic acid) (PLLA) matrix, in cell differentiation. The system constitutes a dynamic surface, in which nanoparticles are exposed as the polymer matrix degrades. ZnO nanoparticles were loaded into PLLA and the system was measured at different time points to characterise the time evolution of the physicochemical properties, including wettability and thermal properties. The micro and nanostructure were also investigated using AFM, SEM and TEM images. Cellular experiments with C2C12 myoblasts show that cell differentiation was significantly enhanced on ZnO nanoparticles -loaded PLLA, as the polymer degrades and the availability of nanoparticles become more apparent, whereas the release of zinc within the culture medium was negligible. Our results suggest PLLA/ZnO nanocomposites can be used as a dynamic system where nanoparticles are exposed during degradation, activating the material surface and driving cell differentiation.4

show abstract

“…26 In this way, the control of crystallization can be seen as a successful approach for improving the physico-mechanical properties of biopolymers. Semicrystalline polymers such as PLLA can crystallize from both molten and glassy states, which usually are termed as melt-crystallization and cold crystallization, respectively.…”

Section: Non-isothermal Melt-crystallization Of Neat Plla and Plla/inmentioning

confidence: 99%

Development of novel melt-processable biopolymer nanocomposites based on poly(l-lactic acid) and WS2 inorganic nanotubes

2014

View full text Add to dashboard Cite

The use of tungsten disulphide inorganic nanotubes (INT-WS 2 ) offers the opportunity to produce novel and advanced biopolymer-based nanocomposite materials with excellent nanoparticle dispersion without the need for modifiers or surfactants via conventional melt blending. The study of the non-isothermal melt-crystallization kinetics provides a clear picture of the transformation of poly(L-lactic acid) (PLLA) molecules from the non-ordered to the ordered state. The overall crystallization rate, final crystallinity and subsequent melting behaviour of PLLA were controlled by both the incorporation of INT-WS 2 and the variation of the cooling rate. In particular, it was shown that INT-WS 2 exhibits much more prominent nucleation activity on the crystallization of PLLA than other specific nucleating agents or nano-sized fillers. These features may be advantageous for the enhancement of mechanical properties and processability of PLLA-based materials. PLLA/INT-WS 2 nanocomposites can be employed as low cost biodegradable materials for many eco-friendly and medical applications, and the exceptional crystallization behaviour observed opens new perspectives for scale-up and broader applications.

show abstract

Phase-structure and mechanical properties of isothermally melt-and cold-crystallized poly (L-lactide)

Cited by 87 publications

References 38 publications

Increased functional properties and thermal stability of flexible cellulose nanocrystal/ZnO films

Increased functional properties and thermal stability of flexible cellulose nanocrystal/ZnO films

PLLA/ZnO nanocomposites: Dynamic surfaces to harness cell differentiation

Development of novel melt-processable biopolymer nanocomposites based on poly(l-lactic acid) and WS2 inorganic nanotubes

Contact Info

Product

Resources

About