Scanning Calorimetry

Androsch, René; Wunderlich, Bernhard

doi:10.1002/9783527631421.ch44

Cited by 11 publications

(8 citation statements)

References 104 publications

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“…The DSC heating scans of Figs. 1 and 2 showed that the glass transition of the MAF is not significantly broadened towards higher temperature, suggesting that the MAF and RAF should be considered as separate nanophases of different properties, and not parts of a single phase in which the restriction of the chain mobility is exponentially decreasing with the distance from the crystal surface [42,62]. Fig.…”

Section: Resultsmentioning

confidence: 95%

Tailoring the rigid amorphous fraction of isotactic polybutene-1 by ethylene chain defects

Lorenzo

Androsch

Stolte

2014

Polymer

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Section: Resultsmentioning

confidence: 95%

Tailoring the rigid amorphous fraction of isotactic polybutene-1 by ethylene chain defects

Lorenzo

Androsch

Stolte

2014

Polymer

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“…The DSC plot of plain PBS (magenta curve) shows a T g of −36 °C, with a c p -jump that points to a mobile amorphous content of w A = 0.22, as calculated by comparison the measured c p -step to the heat capacity step at T g of the fully amorphous polymer [37,44]. This is followed by a small endotherm peaked at 42 °C, coupled with a sizable increase of c p , and then by a broad endotherm, a sharp recrystallization, and a final melting peak.…”

Section: Results and Initial Discussionmentioning

confidence: 99%

Polyamide 11/Poly(butylene succinate) Bio-Based Polymer Blends

2019

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The manuscript details the preparation and characterization of binary blends of polyamide 11 (PA 11) and poly(butylene succinate) (PBS), with PA 11 as the major component. The blends are fully bio-based, since both components are produced from renewable resources. In addition, PBS is also biodegradable and compostable, contrarily to PA 11. In the analyzed composition range (up to 40 m% PBS), the two polymers are not miscible, and the blends display two separate glass transitions. The PA 11/PBS blends exhibit a droplet-matrix morphology, with uniform dispersion within the matrix, and some interfacial adhesion between the matrix and the dispersed droplets. Infrared spectroscopy indicates the possible interaction between the hydrogens of the amide groups of PA 11 chains and the carbonyl groups of PBS, which provides the compatibilization of the components. The analyzed blends show mechanical properties that are comparable to neat PA 11, with the benefit of reduced material costs attained by addition of biodegradable PBS.

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“…As an example of the effect of addition of a nucleating agent on the crystallization rate, in Figure 16 is plotted the crystallization peak time of nonnucleated iPP (squares) and iPP containing 500 ppm γ-quinacridone (diamond symbols) as a function of the crystallization temperature. [146] The data reveal increased crystallization rate of the nucleated iPP at temperatures higher than about 40 C, while at lower temperatures the nucleating agent is not effective in the sense that it can compete with the much higher number of homogeneous nuclei.…”

Section: Preservation Of Homogenoeus Nuclei On Heatingmentioning

confidence: 93%

“…The POM micrographs at the right side in Figure 17 were taken after crystallization of samples of sheared PA 66 at 70 C (top image) and 200 C (bottom image in the FSC, still attached to the FIGURE 16 Crystallization peak times of nonnucleated (squares) and nucleated iPP (diamond symbols) as a function of the crystallization temperature (left). To the right are shown POM images obtained on nonnucleated (right column) and nucleated iPP (left column), after crystallization in an FSC at 30 C (top), 80 C (center), and 120 C (bottom) [146] substrate). Note again that the crystallization half-time of the sample crystallized at 70 C is of the order of magnitude of 10 seconds, while that of the sample crystallized at 200 C was 0.2-0.3 seconds.…”

Section: Preservation Of Homogenoeus Nuclei On Heatingmentioning

confidence: 99%

Nucleation‐controlled semicrystalline morphology of bulk polymers

Schick

Androsch

2018

Polymer Crystallization

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The dependence of formation of qualitatively different semicrystalline morphologies on the degree of supercooling of the melt before nucleation/crystallization is analyzed for a large number of polymers, allowing general statements about nucleation pathways. Emphasis is placed on identification of temperature ranges of prevalent heterogeneous and homogeneous primary crystal nucleation, which are identified by analyses of the temperature dependence of the crystallization kinetics, and of the resulting structure at all length scales. As a typical feature, the density of homogeneous nuclei forming at low temperatures is several orders of magnitude higher than the density of heterogeneous nuclei impacting the dimensions and the spatial organization of crystals. It will also be shown that addition of (athermal) heterogeneous nucleators affects crystallization at low supercooling of the melt, with the availability of a sufficiently large number of these heterogeneous nuclei at the temperature of highest crystal growth rate then even causing faster crystallization than at temperatures of prevailing homogeneous nucleation.

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Scanning Calorimetry

Cited by 11 publications

References 104 publications

Tailoring the rigid amorphous fraction of isotactic polybutene-1 by ethylene chain defects

Tailoring the rigid amorphous fraction of isotactic polybutene-1 by ethylene chain defects

Polyamide 11/Poly(butylene succinate) Bio-Based Polymer Blends

Nucleation‐controlled semicrystalline morphology of bulk polymers

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