The miscibility estimation of some nanocomposites based on starch

Dimonie, Doina; Socoteanu, Radu; Doncea, Sanda Maria; Pop, Florentina Simona; Petre, Celina; Dumitriu, Irina; Fierăscu, Radu Claudiu

doi:10.1515/epoly.2011.11.1.957

Cited by 11 publications

(13 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even the blends of starch with polyvinyl alcohol (PVOH) have been extensively studied [12][13][14][15]; their importance is however alive, mainly because they can be designed for applications which require particular properties. The degradability of starch [16][17][18][19][20][21][22] and PVOH [23][24][25][26][27][28] has been also broadly studied.…”

Section: Introductionmentioning

confidence: 99%

“…The authors have observed that, during melt processing, the starch-PVOH blends degrade by visually changing of color, from natural to yellow, beige, or brown shades [12][13][14][15]. The degradation can occur in the first 2-4 min after the solid and liquid components, premixed in advance, are added into the mixing chamber of Brabender plastograph or almost immediately after the polymers plasticizing, even if additional plasticizers were used [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

New Evidences on the Process Sensitivity of Some Renewable Blends Based on Starch considering Their Melt Rheological Properties

Dimonie

Petrache

Damian

et al. 2016

International Journal of Polymer Science

Self Cite

View full text Add to dashboard Cite

The degradability and processability of new renewable materials based on starch and PVOH were studied using the melt flow index (MFI) method by measuring the melt rheological properties which depend not only on the extrusion conditions and material formulation but also on the macromolecule characteristics which can be modified by chemical degradation. These results were correlated with other material properties like color and cross-linking degree. The obtained results show that flowing in the melted state of the studied materials is accompanied by a second process of chains chemical degradation. It was observed that, at the same level of additivation, under identical extrusion conditions, the melted blends with corn starch as main component are highly mechanically sensitive and degrade mostly by chains scission and those with PVOH as major component are highly temperature sensitive and degrade mainly by cross-linking. The obtained results show also that each PVOH-starch blend requires particular formulation and individual windows of melt processing conditions. These results are a good proof that the MFI method is a good path to study the degradability and moldability of process sensitive polymeric materials like those based on starch and PVOH.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Evidences on the Process Sensitivity of Some Renewable Blends Based on Starch considering Their Melt Rheological Properties

Dimonie

Petrache

Damian

et al. 2016

International Journal of Polymer Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…will appear. The new compounds always will contain, near unmelted particles because of their size, rests from the starch grains, represented by the clustered amylopectin macromolecules which cannot be intimately compounded with linear macromolecules of PVOH or amylose [28]. Otherwise these rests are very well visible on the SEM micrographs (figs.…”

Section: Resultsmentioning

confidence: 99%

“…Several known studies regarding the starch -PVOH compounds refer to issues as: acquiring methods [11,12], plasticizer types [15][16][17][18][19][20][21][22], parameters influencing functional properties [10,11,13,14], other polymeric modifiers [23,24], nano-composites [25], compatibility [26,28], cross-linking [26,27], starch phase transition [29][30][31][32][33][34]. However, about the possibilities to control both the defects and the undesired color change of starch based materials at melt compounding, only general data, in the best case, are known [35].…”

mentioning

confidence: 99%

Some Aspects Conditioning the Achieving of Filaments for 3D Printing from Physical Modified Corn Starch

Dimonie¹,

Damian²,

Trușcă³

et al. 2019

Mat.Plast.

Self Cite

View full text Add to dashboard Cite

It was found that the obtaining of quality 3D printing filaments, without defects and natural color, from corn starch physical modified with PVOH, depends also on the melting behavior at compounding, both of starch and of PVOH, and on the controlling of the process sensitivity of the new compounds. A comparable melting behavior was possible by compounding the two polymers as powders with similar small sized particle. The controlling of the process sensitivity was achievable, mainly, by diminishing the melt resistance to flow, via formulation with a flow agent. The selected compounds which had controlled miscibility, few defects and natural color were shaped, with good results, as filaments with silky and smooth surface. These filaments were compatible with 3D printing because proved to have the ovality and the diameter tolerance in the accepted limits in the fields.

show abstract

“…According to the above-presented FTIR, the spectra of the mechanically recycled compounds showed changes, but not in terms of the appearance of new peaks or the disappearance of others and/or peak translations, which if they existed would prove deep structural changes of a chemical nature [ 30 ].The changes that occurred in these spectra were mainly related either to an intensification of the absorption of all the characteristic peaks, as in the PM2 and PM3 compounds, or a decrease in these absorptions, as inthe PM3 blend. This type of transformation is related to the mobility of the macromolecular chains, which is associated with the length of the macromolecular chains.…”

Section: Resultsmentioning

confidence: 99%

New Biodegradable Materials for Re-Thought Packaging from Pre-Consumer Wastes by Controlling the Storage Time as Method to Increase the Mechanical Recycling Efficiency

et al. 2023

Self Cite

View full text Add to dashboard Cite

The influence of storage conditions on the mechanical recycling of pre-consumer waste (PRE-CW) from the manufacture of multilayer packaging films starting from starch compounds using a renewable-based polymer with PCL and PBAT, which are biodegradable conventional-based polyesters, was studied. It was found that, unlike materials based on conventional-origin polymers that accumulate in the environment for hundreds of years, the studied compounds degraded, even in the solid state, duringstorage in unventilated spaces and during the rainy hot summers with alternatingheat and rain. The degradation of the mechanically recycled compounds obtained from PRE-CW stored in such conditions was highlighted by the comparative analysis with the primary compounds, which proved the following: specific FTIR spectra changes; 2–3-times higher melt fluidity than for primary compounds; melting in successive processes over the entire positive temperatures range, up to 115 °C, such as in cases of compositional de-mixing of incompatible blends, faced to a single melting endotherm with a maximum at around 120 °C for the primar thermal degradation with the movement of the main destruction stages towards higher temperatures; a high quantity residue at 750 °C in air; dispersed mechanical resistance properties y compounds; crystallization at temperatures 10 °C–15 °C higher. The elimination of storage before the mechanical recycling of the pre-consumer waste from this type of polymeric compound fabrication is a way to increase the mechanical recycling efficiency while obtaining new materials with functional properties required by the applications.

show abstract

The miscibility estimation of some nanocomposites based on starch

Cited by 11 publications

References 2 publications

New Evidences on the Process Sensitivity of Some Renewable Blends Based on Starch considering Their Melt Rheological Properties

New Evidences on the Process Sensitivity of Some Renewable Blends Based on Starch considering Their Melt Rheological Properties

Some Aspects Conditioning the Achieving of Filaments for 3D Printing from Physical Modified Corn Starch

New Biodegradable Materials for Re-Thought Packaging from Pre-Consumer Wastes by Controlling the Storage Time as Method to Increase the Mechanical Recycling Efficiency

Contact Info

Product

Resources

About