Crystallization behaviour of poly(ether-ether-ketone)

Cebe, Peggy; Hong, S. D.

doi:10.1016/0032-3861(86)90006-6

Cited by 681 publications

(380 citation statements)

References 21 publications

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“…In order to do so, the nature of the secondary crystallites must first be established. This discussion is based on the two variances 27,31,40,41,[43][44][45]47,48 of the dual-lamellar population model 35,38 and a recent notion on secondary crystallization in polymers proposed by Marand and Alizadeh. 74 It is well established that overall crystallization in semicrystalline polymers can be divided into two main processes: primary crystallization and secondary crystallization.…”

Section: Dependence Of Subsequent Melting Endotherms On Crystallizatimentioning

confidence: 99%

“…34 -50 A number of hypotheses were proposed to explain the occurrence of multiple melting endotherms. In the studies of isothermal crystallization under quiescent conditions (i.e., crystallization is only a function of temperature), the multiple melting behavior of these semicrystalline polymers may be designated as being the result of one of the following reasons: the presence of two (or more) crystal modifications, 13,15 the presence of two (or more) crystalline morphologies, 28 the presence of two populations of crystal lamellae of different thicknesses, 35,38,40,[43][44][45] and the simultaneous melting, recrystallization, and remelting of the lamellae initially formed at the crystallization conditions. 22,34,37,39,42,46 Among these models, simultaneous meltingrecrystallization-remelting and the dual-lamellar population models seem to receive much attention in explaining the multiple melting behavior in various semicrystalline polymers that do not exhibit multiple crystal modifications upon crystallizing at the crystallization conditions studied.…”

Section: Introductionmentioning

confidence: 99%

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Crystallization and melting behavior in syndiotactic polypropylene: Origin of multiple melting phenomenon

Supaphol

2001

J of Applied Polymer Sci

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ABSTRACT:The melting behavior of syndiotactic polypropylene (s-PP) after isothermal crystallization from the melt state was studied using differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) techniques. Three melting endotherms were observed for isothermal crystallization at high degrees of undercooling. The minor endotherm, located closed to the corresponding crystallization temperature, was postulated to be the melting of the secondary crystallites formed at the crystallization temperature. The low-temperature melting peak was found to be the melting of the primary crystallites formed, and the high-temperature melting peak was a result of the melting of the crystallites recrystallized during a heating scan. The triple-melting behavior observed in subsequent melting endotherms of s-PP was therefore described as contributions from melting of the secondary crystallites and their recrystallization, partial melting of the less stable fraction of the primary crystallites and their recrystallization, melting of the primary crystallites, and remelting of the recrystallized crystallites formed during the heating scan. In addition, determination of the equilibrium melting temperature for this s-PP resin according to the linear and nonlinear Hoffman-Weeks extrapolations provided values of 143.1 and 185.6°C, respectively.

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Section: Dependence Of Subsequent Melting Endotherms On Crystallizatimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crystallization and melting behavior in syndiotactic polypropylene: Origin of multiple melting phenomenon

Supaphol

2001

J of Applied Polymer Sci

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“…and biodegradable polymers (e.g. PHB, PLLA), which have usually been interpreted in terms of a pre-exiting morphology 36,37 and/or reorganization. [38][39][40][41][42][43] Both reasons often compete with one another to make the melting behaviour very complex, and sometimes it is very difficult to differentiate between these two phenomena.…”

Section: Effective Energy Barriermentioning

confidence: 99%

Development of novel melt-processable biopolymer nanocomposites based on poly(l-lactic acid) and WS2 inorganic nanotubes

2014

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The use of tungsten disulphide inorganic nanotubes (INT-WS 2 ) offers the opportunity to produce novel and advanced biopolymer-based nanocomposite materials with excellent nanoparticle dispersion without the need for modifiers or surfactants via conventional melt blending. The study of the non-isothermal melt-crystallization kinetics provides a clear picture of the transformation of poly(L-lactic acid) (PLLA) molecules from the non-ordered to the ordered state. The overall crystallization rate, final crystallinity and subsequent melting behaviour of PLLA were controlled by both the incorporation of INT-WS 2 and the variation of the cooling rate. In particular, it was shown that INT-WS 2 exhibits much more prominent nucleation activity on the crystallization of PLLA than other specific nucleating agents or nano-sized fillers. These features may be advantageous for the enhancement of mechanical properties and processability of PLLA-based materials. PLLA/INT-WS 2 nanocomposites can be employed as low cost biodegradable materials for many eco-friendly and medical applications, and the exceptional crystallization behaviour observed opens new perspectives for scale-up and broader applications.

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“…dH c is the enthalpy of the crystallization released during an infinitesimal time range dt. In this experiment, for a chosen cooling rate, the heat flow integration of relative crystallinity calculation can be firstly recorded as a function of temperature T [23], see Equation (3): …”

Section: A-jeziorny Theorymentioning

confidence: 99%

Non-isothermal crystallization kinetics of partially miscible ethylene-vinyl acetate copolymer/low density polyethylene blends

Jin¹,

Chen²,

Zhang³

2010

Express Polym. Lett.

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Abstract. The non-isothermal crystallization kinetics of ethylene-vinyl acetate copolymer (EVA, 14 wt% vinyl acetate content), low density polyethylene (LDPE) and their binary blends with different blending ratio were investigated via differential scanning calorimetry. Jeziorny theory and Mo's method were utilized in evaluating the crystallization behavior of both neat materials successfully. In the primary crystallization stage both EVA and LDPE had three-dimensional spherulitic growth mechanism. Apparently the crystallization rate of LDPE was faster than that of EVA at a low cooling rate. Increase in cooling rate limited the spherulites' growth, which narrowed their rate difference. Influences from blending on the crystallization kinetics of each component in EVA/LDPE mixture were evaluated by Kissinger's activation energy (ΔE) and Khanna's crystallization rate coefficient (CRC). Inter-molecular interaction in the melt increased the ΔE of both EVA and LDPE components at the beginning of cooling. During the primary crystallization stage of LDPE, dilution effect from EVA facilitated the crystal growth in LDPE. Co-crystallization between EVA component and the secondary crystallization stage of LDPE component also increased the CRC of EVA. In blend of EVA/LDPE = 7/3, LDPE obtained the maximal CRC value of 174.2 h -1 . Results obtained from various approaches accorded well with each other, which insured the rationality of conclusion.

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Crystallization behaviour of poly(ether-ether-ketone)

Cited by 681 publications

References 21 publications

Crystallization and melting behavior in syndiotactic polypropylene: Origin of multiple melting phenomenon

Crystallization and melting behavior in syndiotactic polypropylene: Origin of multiple melting phenomenon

Development of novel melt-processable biopolymer nanocomposites based on poly(l-lactic acid) and WS2 inorganic nanotubes

Non-isothermal crystallization kinetics of partially miscible ethylene-vinyl acetate copolymer/low density polyethylene blends

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