Effect of polystyrene on poly(ethylene terephthalate) crystallization

Wellen, Renate Maria Ramos

doi:10.1590/1516-1439.302614

Cited by 14 publications

(9 citation statements)

References 48 publications

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“…Further research [ 29 ] indicated that by blending atactic polystyrene into the polyester, higher amorphicity could be achieved. Therefore, polystyrene and poly‐H were added together in the alumina DSC pan, heated and quenched in liquid nitrogen.…”

Section: Resultsmentioning

confidence: 99%

Repeatable molecularly recyclable semi‐aromatic polyesters derived from lignin

Schijndel

Molendijk

Beurden

et al. 2020

Journal of Polymer Science

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The design of molecularly recyclable polymers contributes to a possible solution to the end‐of‐use issue of polymeric materials and gives a closed‐loop approach toward a circular materials economy. The biobased semi‐aromatic polyesters (e.g., poly(phloretic acid), poly(dihydroferulic acid), and poly(dihydro‐sinapinic acid)), described in this paper, can be derived entirely from biomass (mainly lignin). The described polyesters exhibit thermal properties similar to those of certain commodity polymeric materials. These polyesters with ligno‐phytochemicals as monomer have so far demonstrated complete and almost infinite molecular recyclability with a loss of total mass less than 5% per cycle. Moreover, molecular weight and thermal properties (Tg, Tm, and Tcryst) of the tenth generation polymeric material are identical to those of the first generation.

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Section: Resultsmentioning

confidence: 99%

Repeatable molecularly recyclable semi‐aromatic polyesters derived from lignin

Schijndel

Molendijk

Beurden

et al. 2020

Journal of Polymer Science

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“…Moreover, the reduction of Δ H cc and Δ H m explains why crystallization is difficult. This difficulty as expressed by the reduction in the PHBV degree of crystallinity resulting from EVA addition, which represents a perturbation to the crystalline ordering . PHBV/EVA65 blends containing at least 80 wt% EVA65 showed no cold crystallization.…”

Section: Resultsmentioning

confidence: 99%

“…This difficulty as expressed by the reduction in the PHBV degree of crystallinity resulting from EVA addition, which represents a perturbation to the crystalline ordering. [15] PHBV/EVA65 blends containing at least 80 wt% EVA65 showed no cold crystallization. The DSC curves of PHBV/EVA65 blends with EVA content varying between 10 and 80 wt% exhibited two melting points.…”

Section: Macromolecular Symposiamentioning

confidence: 96%

Thermal and Rheological Behavior of Binary Blends of Poly(hydroxybutyrate‐co‐hydroxyvalerate) and Poly(ethylene‐co‐vinyl acetate) with Different Vinyl Acetate Content

Souza

Staffa

Costa

et al. 2019

Macromolecular Symposia

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The aim of this study is to investigate the influence of vinyl acetate (VA) content on the thermal and rheological properties of poly(hydroxybutyrate‐co‐hydroxyvalerate) (PHBV)/poly(ethylene‐co‐vinyl acetate) (EVA) blends. Binary blends of PHBV and EVA containing 65 wt% (EVA65) and 90 wt% (EVA90) VA were prepared by torque rheometry and their thermal properties were studied by differential scanning calorimetry (DSC). Rheograms of PHBV/EVA65 containing up to 40 wt% EVA showed that the torque values decrease as a function of mixing time due to the thermo‐mechanical degradation, which preferentially for PHBV is chain scission. The increase in the EVA65 concentration results in torque stability probably due to the balance between chain scission of the PHBV and chain branching of the EVA65. For PHBV/EVA90 blends, the torque values are stable indicating that the presence of EVA90 decreases the degradation process of the PHBV and hence increases the thermal stability of blends. DSC curves showed that the PHBV cold crystallization temperature (Tcc) increased and cold crystallization (ΔHcc) and melting enthalpies (ΔHm) decreased with the increase in the EVA content, independently of VA content and blend morphology. DSC curves of PHBV/EVA65 showed two glass transition temperatures and clear phase separations, in all studied formulations, typical of immiscible systems. In contrast to it, PHBV/EVA90 blends showed a single glass transition, suggesting total miscibility. Both findings were corroborated by scanning electron microscopy (SEM) analysis.

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“…Crystallization can have a tremendous impact on fiber mechanical properties, and can also be affected by fiber composition. Wellen et al found that the addition of even small amounts (1 wt %) of PS to PET reduced the rate of cold crystallization or crystallization upon heating due to the anti-nucleating effect of PS on PET, although the ultimate degree of crystallinity was not affected [ 25 , 26 ]. In our work, we found that the degree of crystallization was reduced by blending with 50 wt % PS.…”

Section: Discussionmentioning

confidence: 99%

“…If the crystallinity is too high, stretching during the blow molding cycle may be impaired, while too low crystallinity can result in reduced barrier and mechanical properties. The addition of PS and displacement of the crystallization peak to higher temperatures can contribute to a wider range of cold crystallization phenomena from the segregation between PS and PET molecules [ 25 , 26 ]. The introduction of 1–20 wt % PS caused a shoulder on the crystallization peak in Wellen’s studies, indicative of at least two crystallization phenomena such as different crystalline geometries, but this was not observed in our studies.…”

Section: Discussionmentioning

confidence: 99%

Composite Fibers from Recycled Plastics Using Melt Centrifugal Spinning

2017

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New methods are being developed to enable the production of value-added materials from high-volume, low-cost feedstocks arising from domestic recycling streams. In this work, recycled bottle-grade polyethylene terephthalate, polystyrene, and polypropylene were spun into fibers from the melt using a centrifugal spinning technique. Mono-component fibers and 50/50 blends of each polymer and a 33/33/33 blend of all three polymers were evaluated. Fiber morphology, chemistry, thermal, and mechanical properties were probed. Fiber diameters ranged from ca. 1 to over 12 µm, with polypropylene fibers having the smallest fiber diameters. Mono-component fibers were generally defect-free, while composite fibers containing polypropylene were beady. Fibers made from polyethylene terephthalate had the highest tensile strength, and the addition of polyethylene terephthalate to the other polymers improved the mechanical properties of the blends. Nano-and micro-fibers from both pure and mixed waste streams are expected to have applications in myriad areas such as ultra/micro-filtration, composites, and insulation.

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Effect of polystyrene on poly(ethylene terephthalate) crystallization

Cited by 14 publications

References 48 publications

Repeatable molecularly recyclable semi‐aromatic polyesters derived from lignin

Repeatable molecularly recyclable semi‐aromatic polyesters derived from lignin

Thermal and Rheological Behavior of Binary Blends of Poly(hydroxybutyrate‐co‐hydroxyvalerate) and Poly(ethylene‐co‐vinyl acetate) with Different Vinyl Acetate Content

Composite Fibers from Recycled Plastics Using Melt Centrifugal Spinning

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