A Study on Mechanical and Thermal Properties of PLA/PEO Blends

Eom, Yoojun; Choi, Bulim; Park, Su‐il

doi:10.1007/s10924-018-1344-y

Cited by 40 publications

(37 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The poor thermal stability of PLA is especially important in the case of its application in hot-melt adhesives, where the material needs to be stable during the application process. The improvement of PLA's properties has been realized through pre-drying, peroxide modification, plasticizing (with, e.g., poly (ethylene glycol)), copolymerizing, and blending with poly (vinyl acetate), poly (ethylene oxide) [9][10][11]. For example, a copolymer of PLA and poly(ε-caprolactone) was used as a hot-melt adhesive for the industrial lamination of cardboard and PLA-based films [12].…”

Section: Introductionmentioning

confidence: 99%

Discharge Plasma Treatment as an Efficient Tool for Improved Poly(lactide) Adhesive–Wood Interactions

et al. 2021

View full text Add to dashboard Cite

Poly(lactide) (PLA) films obtained by thermoforming or solution-casting were modified by diffuse coplanar surface barrier discharge plasma (300 W and 60 s). PLA films were used as hot-melt adhesive in joints in oak wood. It was demonstrated that lap shear strength increased from 3.4 to 8.2 MPa, respectively, for the untreated and plasma-treated series. Pull-off tests performed on particleboard for the untreated and treated PLA films showed 100% cohesive failure. Pull-off strength tests on solid oak demonstrated adhesion enhancement from 3.3 MPa with the adhesion failure mode to 6.6 MPa with the cohesion failure mode for untreated and treated PLA. XPS revealed that carbonyl oxygen content increased by two-to-three-fold, which was confirmed in the Fourier-transform infrared spectroscopy experiments of the treated PLA. The water contact angle decreased from 66.4° for the pristine PLA to 49.8° after treatment. Subsequently, the surface free energy increased from 47.9 to 61.05 mJ/m2. Thus, it was clearly proven that discharge air plasma can be an efficient tool to change surface properties and to strengthen adhesive interactions between PLA and woody substrates.

show abstract

Section: Introductionmentioning

confidence: 99%

Discharge Plasma Treatment as an Efficient Tool for Improved Poly(lactide) Adhesive–Wood Interactions

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The analysis of dried dispersion with SDS and starch (entry 3, Table 1 ) showed only a modest shift of the Tg value towards a lower value (Tg = 51 °C) with respect to the pristine polyester, thus indicating a modest effect of the emulsion process even on the thermal properties of the resin. On the contrary, dispersion with SYN showed a significant decrease of ~20 °C in the glass transition temperature (Tg = 34 °C), indicating a plasticization of PLA by the PEO block of SYN [ 78 ]. This latter sample, in addition to the shift in the Tg’s mean value, showed a broadening of the transition, thus reflecting the variety of thermal motions available [ 79 ].…”

Section: Resultsmentioning

confidence: 99%

Preparations of Poly(lactic acid) Dispersions in Water for Coating Applications

et al. 2021

View full text Add to dashboard Cite

A green, effective methodology for the preparation of water-based dispersions of poly(lactic acid) (PLA) for coating purposes is herein presented. The procedure consists of two steps: in the first one, an oil-in-water emulsion is obtained by mixing a solution of PLA in ethyl acetate with a water phase containing surfactant and stabilizer. Different homogenization methods as well as oil/water phase ratio, surfactant and stabilizer combinations were screened. In the second step, the quantitative evaporation of the organic provides water dispersions of PLA that are stable, at least, over several weeks at room temperature or at 4 °C. Particle size was in the 200–500 nm range, depending on the preparation conditions, as confirmed by scanning electron microscope (SEM) analysis. PLA was found not to suffer significant molecular weight degradation by gel permeation chromatography (GPC) analysis. Furthermore, two selected formulations with glass transition temperature (Tg) of 51 °C and 34 °C were tested for the preparation of PLA films by drying in PTFE capsules. In both cases, continuous films that are homogeneous by Fourier-transform infrared spectroscopy (FT-IR) and SEM observation were obtained only when drying was performed above 60 °C. The formulation with lower Tg results in films which are more flexible and transparent.

show abstract

“…When immersed in aqueous DMEM medium, the scaffolds immediately enter the swollen state, which deteriorates the handling during standard processes that use aspiration steps such as medium exchange or fluorescence staining as it renders the fibers extremely vulnerable to mechanical stress. To enhance fiber stability and simultaneously decrease scaffold swelling, the PSS spinning solution was doped with low molecular weight PEO, [ 38 ] which is known to enhance the mechanical properties of polymer systems by increasing their phase separation. The presence of PEO within the CHI/PSS‐PEO fibers was verified by FTIR ( Figure a).…”

Section: Resultsmentioning

confidence: 99%

Wet‐Spinning of Biocompatible Core–Shell Polyelectrolyte Complex Fibers for Tissue Engineering

Chen

Bell

Rauer

et al. 2020

Adv Materials Inter

View full text Add to dashboard Cite

well water-soluble. The water solubility and ionic nature enable PEC solidification in solvent-free environments without the use of toxic additives like initiators or crosslinkers. In addition, biohybrid or completely natural materials can be fabricated, as synthetic polyelectrolytes are readily pairable with natural ones, like chitosan, alginate, or hyaluronic acid [10-12] Moreover, the vast amount of possible base polymers for polyelectrolyte complexation allows the precise adjustment of PEC properties. These include charge density, functional groups, as well as the fabrication of biodegradable materials. As a result, PECs demonstrate significant advantages compared to conventional polymers applied in the biomedical field, where materials interact with sensitive biomolecules or living cells. These properties already led to the successful application of PECs as fibrous scaffolds, hydrogels, capsules and membrane materials. [9,10,13-22] Yim [7] developed PEC scaffolds for the precise delivery and release of various biomolecules such as bovine serum albumin (BSA), vascular endothelial growth factors (VEGF) and nerve growth factors (NGF). They were able to show that PEC fibers can be easily embedded in both a hydrophilic polysaccharide as well as a hydrophobic polycaprolactone (PCL) matrix, which improved the preservation of cargo molecules while simultaneously increasing the efficiency of sustained release. Human mesenchymal stem cells (hMSC) cultivated on NGF-loaded scaffolds showed enhanced differentiation into the neural lineage outlining the cargo release functionality of their composite scaffolds. Gomes [10] demonstrated the continuous fabrication of multicomponent PEC fibers within a Y-shaped microfluidic chip via a two-step crosslinking technique. The prepolymer solutions of chitosan and hyaluronic acid were doped with alginate and extruded into a calcium chloride bath, where alginate was ionically crosslinked by calcium ions. The alginate-fixated prepolymers were subsequently photo crosslinked by UV light to achieve stable PEC fibers. Additionally, human tendon derived cells (hTDC) were encapsulated into the hydrogel fibers to assess the applicability as tissue engineering scaffold. Their results indicate a cell viability of above 80% over 14 days of cultivation. However, besides the major advantages and successfully developed PEC products for life-science applications, there are still many challenges with regard to the implementation of an Polyelectrolyte complex fibers (PEC fibers) have great potential with regard to biomedical applications as they can be fabricated from biocompatible and water-soluble polyelectrolytes under mild process conditions. The present publication describes a novel method for the continuous fabrication of PEC fibers in a water-based wet-spinning process by interfacial complexation within a core-shell spinneret. This process combines the robustness and flexibility of nonsolvent-induced phase separation (NIPS) spinning processes conventionally used in the membrane industry with th...

show abstract

A Study on Mechanical and Thermal Properties of PLA/PEO Blends

Cited by 40 publications

References 28 publications

Discharge Plasma Treatment as an Efficient Tool for Improved Poly(lactide) Adhesive–Wood Interactions

Discharge Plasma Treatment as an Efficient Tool for Improved Poly(lactide) Adhesive–Wood Interactions

Preparations of Poly(lactic acid) Dispersions in Water for Coating Applications

Wet‐Spinning of Biocompatible Core–Shell Polyelectrolyte Complex Fibers for Tissue Engineering

Contact Info

Product

Resources

About