The effect of crosslinking on the mechanical properties of polylactic acid/polycaprolactone blends

Semba, Takeshi; Kitagawa, Kazuo; Ishiaku, U. S.; Hamada, Hiroyuki

doi:10.1002/app.23589

Cited by 294 publications

(258 citation statements)

References 10 publications

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“…Block-copolymers can be produced by reactive extrusion of the polymers with peroxides, as done for PLA/PBAT, PLA/PBS and PLA/PCL blends. [72][73][74] To alter the live-time of generated radicals and therefore alter the possibility of diffusion, so-called 'vector-fluids' were used. 66 Additionally, 'surfactants' based on ambipolar molecules with a miscible polar component were used.…”

Section: Part IImentioning

confidence: 99%

Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

Jost¹

2015

Chem.Biochem.Eng.Q.

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Biopolymers for packaging applications offer many advantages and are therefore of increasing interest. In order to develop a sustainable alternative for petrochemical-based polymers the biobased and biodegradable polymers, the focus of this work are polyhydroxybutyrate-co-valerate (PHBV) and polylactic acid (PLA) (and copolymers). Blending of these two biopolymers was reviewed under thermodynamic aspects and backed with own results. Additionally, different ways of improving the miscibility were performed by compatibilisers, peroxides, transesterification catalysts, and by blending PHBV with modified molecular weight. These blends were extruded as cast films, and characterised by means of mechanical and barrier properties. This study analyses the miscibility of PLA and PHB-copolyester (with approximately equal molar masses) and reports on the unusually high barrier properties in PLA and PHBV blends. However, the quality of blending, especially regarding barrier properties to interphase boundaries, depends on the compatibility of the components and the morphology of the blend. Our results suggest that a PHBV content of 20-35 % in PLA is the most suitable blend system in terms of compatibility and high barrier properties.

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Section: Part IImentioning

confidence: 99%

Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

Jost¹

2015

Chem.Biochem.Eng.Q.

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“…Morphological study and rheological properties indicated that GMA acts as a monomeric plasticizer and a reactive agent at the interface between PLA and PCL phases. Semba and coworkers [95,96] determined the effect of DCP cross-linking on the structure and mechanical properties of PLA/PCL blends. It was found that the diameter of the PCL particles decreased with higher content of DCP during in-situ compatibilization, which results in mechanical properties improvement for the PLA/PCL blend.…”

Section: Aliphatic Polyesters Blendsmentioning

confidence: 99%

Reactive extrusion of bio-based polymer blends and composites – Current trends and future developments

Formela¹,

Zedler²,

Hejna³

et al. 2018

Express Polym. Lett.

108

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Abstract.Reactive extrusion is a cost-effective and environmentally-friendly method to produce new materials with enhanced performance properties. At present, reactive extrusion allows in-situ polymerization, modification/functionalization of polymers or chemical bonding of two (or more) immiscible phases, which can be carried out on commonly used extrusion lines. Although reactive extrusion has been known for many years, its application for processing of bio-based polymer blends and composites is a relatively new direction of scientific research. This work presents a literature review on recent advances in the processing of bio-based polymer blends and composites via reactive extrusion. We described compatibilization mechanisms for different types of biodegradable polymeric materials based on: (i) aliphatic polyesters, (ii) aliphatic polyesters/starch and (iii) aliphatic polyester/natural rubber systems. A special attention was focused on conventional and dynamic cross-linking of bio-based polymer blends and composites as an effective way to prepare new materials with unique properties e.g. biodegradable thermoplastic elastomers or shape-memory materials. Advantages and limitations affecting future trends in development of biodegradable polymer blends and composites reactive extrusion are also discussed.

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“…The results shown in Figure 1A indicate that the addition of 5% (w/w) PLLA reduced the tensile strength and elongation at break by 32% and 85% respectively. This concentration level was chosen as it was in accordance with that used in the literature (commonly 20% (w/w)) (Maglio et al, 2003;Semba et al, 2006).…”

Section: Tensile Propertiesmentioning

confidence: 99%

Thermo-mechanical properties of poly ε-caprolactone/poly l -lactic acid blends: Addition of nalidixic acid and polyethylene glycol additives

Douglas¹,

Albadarin²,

Al-Muhtaseb³

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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Abstract:The search for ideal biomaterials is still on-going for tissue regeneration. In this study, blends of Poly ε-caprolactone (PCL) with Poly l-lactic acid (PLLA), Nalidixic Acid (NA) and Polyethylene glycol (PEG) were prepared. Mechanical and thermal properties of the blends were investigated by tensile and flexural analysis, DSC, TGA, WXRD, MFI, BET, SEM and hot stage optical microscopy. Results showed that the loading of PLLA caused a significant decrease in tensile strength and almost total eradication of the elongation at break of PCL matrix, especially after PEG and NA addition. Increased stiffness was also noted with additional NA, PEG and PLLA, resulting in an increase in the flexural modulus of the blends.Isothermal degradation indicated that bulk PCL, PLLA and the blends were thermally stable at 200°C for the duration of 2h making extrusion of the blends at this temperature viable.Morphological study showed that increasing the PLLA content and addition of the very low viscosity PEG and powder NA decreased the Melt Flow Indexer and increased the viscosity.At the higher temperature the PLLA begins to soften and eventually melts allowing for increased flow and, coupling this with, the natural increase in MFI caused by temperature is enhanced further. The PEG and NA addition increased dramatically the pore volume which is important for cell growth and flow transport of nutrients and metabolic waste.

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The effect of crosslinking on the mechanical properties of polylactic acid/polycaprolactone blends

Cited by 294 publications

References 10 publications

Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

Reactive extrusion of bio-based polymer blends and composites – Current trends and future developments

Thermo-mechanical properties of poly ε-caprolactone/poly l -lactic acid blends: Addition of nalidixic acid and polyethylene glycol additives

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