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Fernandez, J. O.; Swallowe, G. M.

doi:10.1023/a:1004817325954

Cited by 13 publications

(4 citation statements)

References 21 publications

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“…It was usual that stress reduced with the increase in the film thickness. It was already reported that stress could enhance nucleation or reduce crystallization temperature [26][27][28]. Consequently, the rise in crystallization temperature with increasing x can be explained by the reduction in stress with the increase in x.…”

Section: Resultsmentioning

confidence: 95%

“…Furthermore, the fact that the vibration frequencies of modes A, B, and C vary monotonously with x reveals the monotonous variation of stress in SLL [Ge 8 Sb 92 /Ge (x nm)] 3 films with x. Based on the effect of the stress-enhanced crystallization reported [26][27][28], the crystallization temperature of SLL [Ge 8 Sb 92 /Ge (x nm)] 3 films should increase monotonously with the increase in x, which agrees very well with the experimentally measured variation of crystallization temperature shown in Figure 6b and the inset in Figure 1. Therefore, the variation of crystallization temperature with x in SLL [Ge 8 Sb 92 /Ge (x nm)] 3 films can be explained well by a new stress effect, instead of an existing interfacial effect and the reduction in thermal conductivity.…”

Section: Resultsmentioning

confidence: 99%

“…It was well known that stress could influence the crystallization of amorphous film materials. It was also reported that stress could enhance nucleation or reduce crystallization temperature [26][27][28]. Therefore, it is reasonable to take account for the effect of stress on crystallization as a new mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of Nano-Structuring Manipulation of the Crystallization Temperature of Superlattice-like [Ge8Sb92/Ge]3 Phase-Change Films

Qiu

et al. 2020

Nanomaterials

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Superlattice-like (SLL) phase-change film is considered to be a promising phase-change material because it provides more controllabilities for the optimization of multiple performances of phase-change films. However, the mechanism by which SLL structure affects the properties of phase-change films is not well-understood. Here, four SLL phase-change films [Ge8Sb92(15 nm)/Ge (x nm)]3 with different x are fabricated. Their behaviors of crystallization are investigated by measuring sheet resistance and coherent phonon spectroscopy, which show that the crystallization temperature (TC) of these films increases anomalously with x, rather than decreases as the interfacial effects model predicted. A new stress effect is proposed to explain the anomalous increase in TC with x. Raman spectroscopy reveals that Raman shifts of all phonon modes in SLL films deviate from their respective standard Raman shifts in stress-free crystalline films, confirming the presence of stress in SLL films. It is also shown that tensile and compressive stresses exist in Ge and Ge8Sb92 layers, respectively, which agrees with the lattice mismatch between the Ge and Ge8Sb92 constituent layers. It is also found that the stress reduces with increasing x. Such a thickness dependence of stress can be used to explain the increase in crystallization temperature of four SLL films with x according to stress-enhanced crystallization. Our results reveal a new mechanism to affect the crystallization behaviors of SLL phase-change films besides interfacial effect. Stress and interfacial effects actually coexist and compete in SLL films, which can be used to explain the reported anomalous change in crystallization temperature with the film thickness and cycle number of periods in SLL phase-change films.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

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Mechanism of Nano-Structuring Manipulation of the Crystallization Temperature of Superlattice-like [Ge8Sb92/Ge]3 Phase-Change Films

Qiu

et al. 2020

Nanomaterials

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“…The Young's modulus of the perfectly crystalline and totally amorphous PET materials were obtained directly from the literature 14. The yield strength values of the totally crystalline and totally amorphous PETs were derived according to the two‐phase model based on experimental data provided at 263 K 15. As shown in Figure 5, a straight line was fitted between the crystallinity and the yield strength values.…”

Section: Methodsmentioning

confidence: 99%

An integrative simulation approach to weight reduction in poly(ethylene terephthalate) bottles

Daver

Demirel

Sutanto

et al. 2012

J of Applied Polymer Sci

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Poly(ethylene terephthalate) (PET) is a widely used resin in the production of carbonated soft drink (CSD) bottles produced by injection-stretch blow molding. A reduction in the bottle weight brings down the cost of packaging by reducing the materials and manufacturing costs. This article presents an integrative simulation study where 1.5-L CSD bottles produced from preforms with different weights were assessed in terms of process viability and product quality. The simulation results were analyzed with respect to the experimental data obtained for the currently used CSD bottle made from 40 g of preform. We found that we could reduce the weight of the PET bottles by 7.5% without jeopardizing the functionality of the bottles in terms of the structural performance properties, such as the top-load and burst strengths.

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Modification of the thermal properties and crystallization behaviour of poly(ethylene terephthalate) by copolymerization

Kint

Muñoz‐Guerra

2003

Polymer International

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Poly(ethylene terephthalate) (PET) is a widely used polyester, which can be crystallized from the melt over a wide range of supercooling conditions or, alternatively, quenched into the amorphous state and, subsequently, crystallized by thermal treatment above the glass‐transition temperature. It is well known that the crystallization of PET can be hindered by means of copolymerization or reactive blending. The incorporation of comonomeric units into the polymer backbone leads to an irregular chain structure and thereby inhibits regular chain packing for crystallization. The crystallization of PET copolyesters is strongly influenced by the chain microstructure regarding comonomer distribution, randomness and length of the crystallizable ethylene terephthalate sequences. This paper is mainly devoted to the thermally induced crystallization behaviour of PET and to reviewing the efforts that have been made in the last decade to modify the glass‐transition and melting temperatures, the crystallinity and the crystallization rate of this polyester. Furthermore, some illustrative experimental data obtained from isothermal and non‐isothermal crystallization of PET are included in this study.© 2003 Society of Chemical Industry

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Untitled

Cited by 13 publications

References 21 publications

Mechanism of Nano-Structuring Manipulation of the Crystallization Temperature of Superlattice-like [Ge8Sb92/Ge]3 Phase-Change Films

Mechanism of Nano-Structuring Manipulation of the Crystallization Temperature of Superlattice-like [Ge8Sb92/Ge]3 Phase-Change Films

An integrative simulation approach to weight reduction in poly(ethylene terephthalate) bottles

Modification of the thermal properties and crystallization behaviour of poly(ethylene terephthalate) by copolymerization

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