Glass transition temperature of poly(d,l-lactic acid) of different molar mass

Zhang, Rui; Du, Fanfan; Jariyavidyanont, Katalee; Zhuravlev, Evgeny; Schick, Christoph; Androsch, René

doi:10.1016/j.tca.2022.179387

Cited by 13 publications

(15 citation statements)

References 64 publications

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“…Therefore, the parameter A* was fixed and set as log A* = −50, which is often applied in different studies in a similar way. 12,63 For cooling rates higher than 10 2 K/s, the VFTH equation fits the data well, although the crystalline fraction varies from 0 to about 0.4. The fit parameters are listed in Table S1 of the Supporting Information.…”

Section: ■ Results and Discussionmentioning

confidence: 87%

“…63−67 The initial glass transition FSC studies on PLA focused on the fragility of short-chain PLA 68 and the effect of the D, L-stereoisomerism on the glass transition temperature. 12 In the present study, the structural relaxation and glass transition dynamics of semicrystalline PLA are investigated by FSC, to analyze the effect of the presence of crystals. In extension to earlier studies in this field, however, RAF formation, in conjunction with an isothermal crystallization process, is suppressed by fast cooling, allowing analysis of the behavior of the MAF.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Finally, a reheating scan (red segment) is recorded for estimation of the cooling-rate-dependent limiting fictive temperature. 12,62,63,72,73 Crystalline and Amorphous Fractions. For a demonstration of the evaluation of phase fractions from FSC scans, Figure 2 shows a heating scan of PLA crystallized at 363 K for 1000 s (blue line).…”

Section: ■ Introductionmentioning

confidence: 99%

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Physical Aging and Glass Transition Dynamics of Semicrystalline Poly(lactic acid) for 3D-Printing Applications Investigated by Fast Scanning Calorimetry

Zhang,

Jariyavidyanont,

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et al. 2023

Macromolecules

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Physical aging and the glass transition dynamics of semicrystalline poly(lactic acid) (PLA), designed for three-dimensional (3D)-printing applications, are investigated by fast scanning calorimetry for identifying the effect of crystallinity on the relaxation behavior of the amorphous phase. PLA was crystallized by annealing the isotropic melt at 363 K for different times between 100 and 1000 s, yielding a two-phase structure composed of a single amorphous phase and up to 40% crystals. Then, these samples were physically aged at temperatures between 270 and 310 K, that is, at temperatures about 60 to 20 K lower than the glass transition temperature T g, respectively. The presence of crystals slows down the relaxation rate of the amorphous glass at temperatures slightly lower than T g, indicating a confinement effect. In agreement with this observation, the Vogel temperature of the amorphous phase increases by almost 10 K, when the crystallinity is increased from 0 to 40%. For semicrystalline PLA, the glass transition dynamics is different after cooling the system faster or slower than about 100 K/s, being in line with the former observation of nonisothermal secondary crystallization and possible formation of a rigid amorphous fraction on slow cooling.

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Section: ■ Results and Discussionmentioning

confidence: 87%

Section: ■ Introductionmentioning

confidence: 99%

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Physical Aging and Glass Transition Dynamics of Semicrystalline Poly(lactic acid) for 3D-Printing Applications Investigated by Fast Scanning Calorimetry

Zhang,

Jariyavidyanont,

Zhuravlev

et al. 2023

Macromolecules

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“…29 S. cerevisiae may produce a variety of metabolites, including alcohol and CO 2 . 30 Specifically, lactic acid has a low glass transition temperature (44–51 °C), 31 which may cause particle adhesion to the drying chamber reducing the yield.…”

Section: Resultsmentioning

confidence: 99%

Caramel colour pigments from black sapote (Diospyros digyna): obtention and food application

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et al. 2023

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“…There are different experimental methods for exploring the T g of materials, such as differential scanning calorimetry (DSC) 30,31 and dilatometry. 32 Although these methods can provide a good measurement of T g , they are unable to provide underlying insights.…”

Section: Introductionmentioning

confidence: 99%

Assessing the impact of ultra-thin diamond nanothreads on the glass transition temperature of a bituminous binder

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Nanoscale Adv.

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Glass transition temperature of poly(d,l-lactic acid) of different molar mass

Cited by 13 publications

References 64 publications

Physical Aging and Glass Transition Dynamics of Semicrystalline Poly(lactic acid) for 3D-Printing Applications Investigated by Fast Scanning Calorimetry

Physical Aging and Glass Transition Dynamics of Semicrystalline Poly(lactic acid) for 3D-Printing Applications Investigated by Fast Scanning Calorimetry

Caramel colour pigments from black sapote (Diospyros digyna): obtention and food application

Assessing the impact of ultra-thin diamond nanothreads on the glass transition temperature of a bituminous binder

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