Nucleation and crystallization of random aliphatic-butylene terephtalate copolyester

Wojtczak, Malgorzata; Dutkiewicz, Sławomir; Pietrzak, Łukasz; Gałęski, Andrzej; Piórkowska, Ewa

doi:10.1016/j.eurpolymj.2015.08.004

Cited by 11 publications

(5 citation statements)

References 35 publications

(56 reference statements)

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“…This result suggests that lignin particles may act as a nucleating agent to increase the T c of the PBAT matrix. It has been demonstrated that particles containing an aromatic chemical structure can play a role as a nucleating agent in the aromatic semicrystalline polymer through π–π interactions between the particle and polymer backbones. , …”

Section: Resultsmentioning

confidence: 99%

“…It has been demonstrated that particles containing an aromatic chemical structure can play a role as a nucleating agent in the aromatic semicrystalline polymer through π−π interactions between the particle and polymer backbones. 40,41 T c of the lignin-reinforced PBAT biocomposites with the CE also increased (Figure 1B) because of the branching points of the PBAT polymer chain, which act as heterogeneous nucleating sites for crystallization, and the nucleating effect of lignin. 42 Because a large increment in the T c of a matrix polymer can improve the melt strength during the cooling stage of the foaming process, lignin-reinforced PBAT biocomposites with the CE are expected to have a shorter cooling time and a higher production efficiency.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Construction and Characterization of Biodegradable Foam from High-Content Lignin-Reinforced Poly(Butylene Adipate-co-Terephthalate) Biocomposites

Hong

Hwang

2022

ACS Appl. Polym. Mater.

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High-content lignin-reinforced poly(butylene adipateco-terephthalate) (PBAT) biocomposites were successfully constructed by the incorporation of lignin particles into a biodegradable PBAT matrix. The effect of lignin content with and without a chain extender (CE) on the thermal and mechanical properties of the biocomposites was investigated. Although the mechanical properties for all biocomposites showed similar decreases with little influence from the addition of CE, the crystallization temperature increased because of the branching points of the PBAT polymer chain, which serve as heterogeneous nucleating sites for crystallization, and the nucleating effect of the lignin particle. The foamability of the lignin-reinforced PBAT biocomposites, which comprised a chemical blowing agent, azodicarbonamide, and a cross-linking agent, dicumyl peroxide, was studied. Was also studied the process in the presence of azodicarbonamide (chemical blowing agent) and dicumyl peroxide (cross-linking agent). When lignin was added to the PBAT biocomposites at a content of less than 20 wt %, a typical foam structure was detected. After the addition of CE, the lignin-reinforced PBAT biocomposites exhibited a cellular structure for lignin contents below 50 wt %. However, the foam quality of the ligninreinforced PBAT biocomposites with CE was uniform for lignin contents up to 30 wt %. This high-content lignin-reinforced PBAT biocomposite with a CE should provide cost-effective and sustainable biodegradable foam that can be used for cushioning packaging applications.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Construction and Characterization of Biodegradable Foam from High-Content Lignin-Reinforced Poly(Butylene Adipate-co-Terephthalate) Biocomposites

Hong

Hwang

2022

ACS Appl. Polym. Mater.

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“…It should be noted that the formation of the PLA/PBASGT or PLA/PBAT blends or composites is accompanied by selfnucleation effect. 23 The total removal of the melt memory requires heating of a polymer above its equilibrium melting temperature. However the material is molten at relatively low temperature of 180 C the melt memory is hardly erased at that temperature (Fig.…”

Section: Thermal and Dynamic Mechanical Analysismentioning

confidence: 99%

In situ generation of sustainable PLA-based nanocomposites by shear induced crystallization of nanofibrillar inclusions

et al. 2019

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“…A study investigating the crystallization of a newly synthesized aliphatic–aromatic copolyester (PBAGST) based on three aliphatic comonomers (succinate, glutarate and adipate dibutyl esters) and one aromatic (butylene terephthalate) comonomer revealed that the aromatic self-nucleation sites are stable below 150 °C, which is far lower than industrial compounding conditions. As soon as PBASGT is melted at a higher temperature, these self-nucleation sites disappear and the subsequent crystallization temperature drops by 25 °C to lower temperatures [ 21 , 22 ]. The latest ex situ crystallization study of PBAT using polarized light microscopy suggests a great possibility for shifting crystallization during cooling to higher temperatures, with an enhanced point-like nucleated structure [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Shear-Induced and Nanofiber-Nucleated Crystallization of Novel Aliphatic–Aromatic Copolyesters Delineated for In Situ Generation of Biodegradable Nanocomposites

Hosseinnezhad

2021

Polymers

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The shear-induced and cellulose-nanofiber nucleated crystallization of two novel aliphatic–aromatic copolyesters is outlined due to its significance for the in situ generation of biodegradable nanocomposites, which require the crystallization of nanofibrous sheared inclusions at higher temperatures. The shear-induced non-isothermal crystallization of two copolyesters, namely, poly(butylene adipate-co-succinate-co-glutarate-co-terephthalate) (PBASGT) and poly(butylene adipate-co-terephthalate) (PBAT), was studied following a light depolarization technique. To have a deep insight into the process, the effects of the shear rate, shear time, shearing temperature and cooling rate on the initiation, kinetics, growth and termination of crystals were investigated. Films of 60 μm were subjected to various shear rates (100–800 s−1) for different time intervals during cooling. The effects of the shearing time and increasing the shear rate were found to be an elevated crystallization temperature, increased nucleation density, reduced growth size of lamella stacks and decreased crystallization time. Due to the boosted nucleation sites, the nuclei impinged with each other quickly and growth was hindered. The effect of the cooling rate was more significant at lower shear rates. Shearing the samples at lower temperatures, but still above the nominal melting point, further shifted the non-isothermal crystallization to higher temperatures. As a result of cellulose nanofibers’ presence, the crystallization of PBAT, analyzed by DSC, was shifted to higher temperatures.

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Nucleation and crystallization of random aliphatic-butylene terephtalate copolyester

Cited by 11 publications

References 35 publications

Construction and Characterization of Biodegradable Foam from High-Content Lignin-Reinforced Poly(Butylene Adipate-co-Terephthalate) Biocomposites

Construction and Characterization of Biodegradable Foam from High-Content Lignin-Reinforced Poly(Butylene Adipate-co-Terephthalate) Biocomposites

In situ generation of sustainable PLA-based nanocomposites by shear induced crystallization of nanofibrillar inclusions

Shear-Induced and Nanofiber-Nucleated Crystallization of Novel Aliphatic–Aromatic Copolyesters Delineated for In Situ Generation of Biodegradable Nanocomposites

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