Journal ArticleDOI
The effect of supercooling of the melt on the semicrystalline morphology of PA 66
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TLDR
In this paper, fast scanning chip calorimetry (FSC) was used to prepare isothermally crystallized samples of polyamide 66 (PA 66) in a wide range of temperatures between 70 and 230°C for subsequent analysis of the semicrystalline morphology by X-ray diffraction, polarized-light optical microscopy and atomic force microscopy.About:
This article is published in Thermochimica Acta.The article was published on 2017-09-10. It has received 43 citations till now. The article focuses on the topics: Crystallization of polymers & Crystallization.read more
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Influence of α′‐/α‐crystal polymorphism on properties of poly(l‐lactic acid)
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Crystallization of biodegradable and biobased polyesters: Polymorphism, cocrystallization, and structure-property relationship
Ying Zheng,Pengju Pan +1 more
TL;DR: In this article, the authors reviewed the recent progress in the understanding of the polymorphic crystallization, co-crystallization, and structure-property relationship of synthetic biodegradable and biobased polyesters that has occurred within the past decade.
Homogeneous crystal nucleation in polymers
Abstract: The pathway of crystal nucleation significantly influences the structure and properties of semi-crystalline polymers. Crystal nucleation is normally heterogeneous at low supercooling, and homogeneous at high supercooling, of the polymer melt. Homogeneous nucleation in bulk polymers has been, so far, hardly accessible experimentally, and was even doubted to occur at all. This topical review summarizes experimental findings on homogeneous crystal nucleation in polymers. Recently developed fast scanning calorimetry, with cooling and heating rates up to 106 K s-1, allows for detailed investigations of nucleation near and even below the glass transition temperature, including analysis of nuclei stability. As for other materials, the maximum homogeneous nucleation rate for polymers is located close to the glass transition temperature. In the experiments discussed here, it is shown that polymer nucleation is homogeneous at such temperatures. Homogeneous nucleation in polymers is discussed in the framework of the classical nucleation theory. The majority of our observations are consistent with the theory. The discrepancies may guide further research, particularly experiments to progress theoretical development. Progress in the understanding of homogeneous nucleation is much needed, since most of the modelling approaches dealing with polymer crystallization exclusively consider homogeneous nucleation. This is also the basis for advancing theoretical approaches to the much more complex phenomena governing heterogeneous nucleation.
Journal ArticleDOI
Nanocalorimetry: Door opened for in situ material characterization under extreme non-equilibrium conditions
TL;DR: Nanocalorimetry has attracted extensive attention in the field of materials science, where it is applied to perform quantitative analysis of rapid phase transitions and evaluation of size effects.
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Crystal reorganization of poly (butylene terephthalate)
TL;DR: In this paper, the kinetics of isothermal melt-crystallization of poly (butylene terephthalate) (PBT) have been evaluated in a wide temperature range from below the glass transition temperature Tg to close to the equilibrium melting temperature, using fast scanning chip calorimetry.
References
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Journal ArticleDOI
The Crystal Structures of Two Polyamides ('Nylons')
C. W. Bunn,E. V. Garner +1 more
TL;DR: In this paper, a detailed interpretation of the X-ray diffraction patterns of fibres and sheets of 66 and 6.10 polyamides (polyhexamethylene adipamide and sebacamide respectively) is proposed.
Journal ArticleDOI
Crystal Structures and Properties of Nylon Polymers from Theory
TL;DR: In this paper, a complete force field (MSXX) for simulation of all nylon polymers is derived from ab initio quantum calculations, with special emphasis on the accuracy of the hydrogen bond potential for the amide unit and the torsional potential between the peptide and alkane fragments.
Journal ArticleDOI
Insights into polymer crystallization and melting from fast scanning chip calorimetry
TL;DR: Fast scanning chip calorimetry in its non-adiabatic version allows for heating and cooling at rates up to 106 K s−1, covering all polymer processing relevant rates as mentioned in this paper.
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René Androsch,Christoph Schick +1 more