On the Kissinger equation and the estimate of activation energies for non-isothermal cold crystallization of PET

Wellen, Renate Maria Ramos; Canedo, Eduardo L.

doi:10.1016/j.polymertesting.2014.08.008

Cited by 95 publications

(40 citation statements)

References 42 publications

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“…We speculate that pure PET domains start crystallising first, at lower temperature, due to its lower activation energy [43]. In due time, the presence of segregated PS interferes with the growing crystallites and slows down the crystallisation process.…”

Section: Resultsmentioning

confidence: 94%

“…The peak component characteristics were found to be dependent on the PS content of the blend. It is speculated that pure PET domains start crystallising first, at lower temperature, due to its lower activation energy [43], then followed by the crystallisation of the PET/PS phase. A simple model based on the partial dissolution and microsegregation of PS was proposed to qualitatively explain the presence of double peaks.…”

Section: Discussionmentioning

confidence: 99%

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Complex cold crystallisation peaks in PET/PS blends

Wellen

Canedo

2015

Polymer Testing

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Section: Resultsmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Complex cold crystallisation peaks in PET/PS blends

Wellen

Canedo

2015

Polymer Testing

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“…The activation energy (∆ E ) of non‐isothermal cold crystallization of PLA and PLA/PDLA blends can be derived from the Kissinger method:

\frac{d ([], \ln ((), \frac{ϕ}{T_{p}^{2}}))}{d ((), \frac{1}{T_{p}})} = - \frac{normalΔ E}{R}

where R is the universal gas constant, ϕ represents the heating rate, and T p is the crystallization peak temperature obtained from DSC heating curves. The activation energy of non‐isothermal cold crystallization of PLA and PLA/PDLA blends were calculated by the Kissinger plots of ln(

\frac{true}{ϕ}

) vs 1000/ T p , which were showed in Figure .…”

Section: Resultsmentioning

confidence: 99%

The role of cold crystallization of homochiral crystallites in the superb heat resistant poly(lactic acid)

Zhao

Fan

et al. 2020

Polymers for Advanced Techs

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The superb heat resistance poly(lactic acid) (PLA) were prepared by blending PLA and poly(D-lactic acid) (PDLA) with various molecular weight (M n ). Formation of the stereocomplex in the blends was confirmed by differential scanning calorimetry and wide-angle X-ray diffraction. The results of the heat resistance implied it is possible that elevating the Vicat penetration temperature of PLA up to 150 C by blending with PDLA. The cold crystallization of homochiral crystallites is proven to be the critical factor affecting the heat resistance of PLA. While the PLA or PLA/PDLA blends were heated to cold crystallization temperature of samples, both the crystal content and the rigid amorphous region content are increased due to the cold crystallization and tethering effect, and the stiffness and heat resistance of the sample are improved. The cold crystallization homochiral crystallites kinetics of PLA and PLA/PDLA blends was also studied. The results showed the activation energy (ΔE) of cold crystallization increased from 120.30 kJ/mol to 144.66 kJ/mol with the increasing of PDLA content from 2% to 10%. K E Y W O R D Scold crystallization, poly(lactic acid), superb heat resistance

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“…The glass transition and crystallization process were studied by heating the samples from room temperature to 1200 K at heating rates of 20, 40, 80 and 200 K/min. The crystallization kinetics, especially crystallization activation energy, pre-exponential coefficient of effective overall reaction rate, reaction order and types of crystal growth, were evaluated using Kissinger equation and Johnson-Mehl-Avrami (JMA) method [27][28][29][30][31][32].…”

Section: Methodsmentioning

confidence: 99%

“…Table 1 summarizes the measured parameters, including the glass transition temperature T g , the onset crystallization temperature T x , and the crystallization peak temperature T p . From Figure 3, The apparent crystallization activation energy E and the overall crystallization reaction rate K 0 for each of the two crystallization processes can be determined using Kissinger equation (1) [27][28][29][30].…”

Section: Methodsmentioning

confidence: 99%

Crystallization, mechanical and electrochemical behavior of Al-Ce-TM (TM = Fe, Co, Ni and Cu) amorphous alloys

2019

IJNN

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Al86Ce10TM4 amorphous alloys (TM=Fe, Co, Ni and Cu) were fabricated using melt-spin fast-quenching method. The crystallization, mechanical and electrochemical behavior of the as-spun and the post-annealed alloys were investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), micro-indentation and electrochemical techniques. It was found the completely amorphous Al86Ce10TM4 alloys (TM=Fe, Co, Ni and Cu) go through two crystallization processes, where the first exothermal peak represents nucleation of nano-crystalline particles and the second exothermal peak signifies growth of the nano-crystalline precipitates. Both the nucleation and growth processes rely on diffusion-controlled mechanism. The first onset crystallization temperature Tx1 associated with activation energy E1 and frequency factor Ko1 can be used to evaluate the thermal stability of the amorphous alloys while the second onset crystallization temperature Tx2 associated with activation energy E2 and frequency factor Ko2 can be taken to judge the thermal stability of ideal amorphous-nanocrystalline mixed structure in sustaining optimized mechanical and electrochemical properties. The as-spun and post-annealed alloys exhibit higher mechanical hardness (860~1180 MPa), corrosion resistance (10-8A/cm2 ) and high temperature endurance (284, 300 and 420°C for Al86Ce10Co4 , Al86Ce10Ni4 andAl86Ce10Fe4 , respectively) compared to hardness 500~600 MPa, corrosion resistance 10-7A/cm2 and high temperature durability 200°C of traditional Al crystalline alloys, manifesting the value on scientific studies and engineering applications of the Al86Ce10TM4 amorphous alloys.

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On the Kissinger equation and the estimate of activation energies for non-isothermal cold crystallization of PET

Cited by 95 publications

References 42 publications

Complex cold crystallisation peaks in PET/PS blends

Complex cold crystallisation peaks in PET/PS blends

The role of cold crystallization of homochiral crystallites in the superb heat resistant poly(lactic acid)

Crystallization, mechanical and electrochemical behavior of Al-Ce-TM (TM = Fe, Co, Ni and Cu) amorphous alloys

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