Clever use of PCL as kinetic controller in PBT/PCL blends

Silva, I D S; Jaques, Nichollas Guimarães; Barros, Janetty Jany Pereira; Almeida, Débora E. O.; Lima, Eunice Paloma Nascimento; Araujo, R.N.; Cerqueira, Glauber Rodrigues Cerqueira de; Pereira, Camila Ariana Becker; Silva, A F P; Nepomuceno, Neymara C.; Cesario, Luanna V.; Siqueira, Danilo Diniz; Wellen, Renate Maria Ramos

doi:10.1088/2053-1591/ab44e2

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…In fact, for many copolymers, homopolymers, and blinks, Ozawa theory has been shown to be inadequate to describe their non-isothermal crystallization kinetics [ 25 , 28 , 29 , 30 ]. They argued that the Ozawa method ignored secondary crystallization, resulting from spherulite impingement and restricted effects, and other reasons, the quasi-isothermal nature of the treatment.…”

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confidence: 99%

Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(l-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter

et al. 2021

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The non-isothermal crystallization kinetics of double-crystallizable poly(ethylene glycol)–poly(l-lactide) diblock copolymer (PEG-PLLA) and poly(ethylene glycol) homopolymer (PEG) were studied using the fast cooling rate provided by a Fast-Scan Chip-Calorimeter (FSC). The experimental data were analyzed by the Ozawa method and the Kissinger equation. Additionally, the total crystallization rate was represented by crystallization half time t1/2. The Ozawa method is a perfect success because secondary crystallization is inhibited by using fast cooling rate. The first crystallized PLLA block provides nucleation sites for the crystallization of PEG block and thus promotes the crystallization of the PEG block, which can be regarded as heterogeneous nucleation to a certain extent, while the method of the PEG block and PLLA block crystallized together corresponds to a one-dimensional growth, which reflects that there is a certain separation between the crystallization regions of the PLLA block and PEG block. Although crystallization of the PLLA block provides heterogeneous nucleation conditions for PEG block to a certain extent, it does not shorten the time of the whole crystallization process because of the complexity of the whole crystallization process including nucleation and growth.

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Section: Resultsmentioning

confidence: 99%

Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(l-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter

et al. 2021

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Efeito do recozimento nas propriedades mecânicas, térmicas e termomecânicas da PCL

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A demanda do mercado por polímeros biodegradáveis tem aumentado rapidamente, e a policaprolactona (PCL) aponta como opção interessante para indústria e a comunidade científica. O presente trabalho teve como objetivo avaliar o efeito do tratamento térmico de recozimento nas propriedades mecânicas (impacto, tração, flexão e dureza), termomecânicas (temperatura de deflexão térmica (HDT) e temperatura de amolecimento Vicat (TAV)) e térmicas (calorimetria exploratória diferencial (DSC) e termogravimetria (TG)), em corpos de prova injetados da PCL. Obteve-se aumento no módulo elástico, na resistência à tração, na dureza Shore D, na HDT, na TAV e na estabilidade térmica da PCL após tratamento térmico à 50°C. Enquanto, decréscimos foram verificados na resistência ao impacto e no alongamento na ruptura. No geral, o recozimento aumentou o desempenho da PCL e pode ser considerado como próspera metodologia na manipulação de propriedades almejadas para aplicações específicas.

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Clever use of PCL as kinetic controller in PBT/PCL blends

Cited by 2 publications

References 33 publications

Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(l-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter

Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(l-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter

Efeito do recozimento nas propriedades mecânicas, térmicas e termomecânicas da PCL

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