Crystallization of low and high molecular materials

Kanig, G.

doi:10.1007/bf01421707

Cited by 9 publications

(10 citation statements)

References 66 publications

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“…Since the TTM are not generally visible in EM (an exception is the "veiling" of the "shish-kebab") and also not easily detectable by some other technique (IR in polyamide fibers [206], crystalline bridges derived from coherence length in WAXS [204]) some people base their beliefs on an erroneous analysis of the coloring experiments with uranyl acetate, and still assume that lamellae are the main elements of the drawn or extruded sample [207]. Since the microfibrils are laterally densely packed [208] no larger molecules can penetrate the crystalline-amorphous boundary layer between them, although they go abundantly into the wider amorphous layers in the microfibrils between the blocks.…”

Section: IImentioning

confidence: 99%

Drawing and extrusion of semi-crystalline polymers

Peterlin

1987

Colloid & Polymer Sci

245

194

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This review treats mainly the initial transformation of the starting unoriented lamellar material into the final oriented microfibrillar structure and its drawing. If the starting material has partially oriented shish-kebab structure the drawing is a combination of transformation of lamellae into the microfibrils and the drawing of microfibrils. The review artide is based on the literature from the last ten years and relys heavily on recent reviewing [1][2][3]. Older articles are only included if they have contributed to the basic ideas and experiments of drawing.

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Section: IImentioning

confidence: 99%

Drawing and extrusion of semi-crystalline polymers

Peterlin

1987

Colloid & Polymer Sci

245

194

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“…It is conceivable that the partially crystalline polymer system, which is in an arrested state, is heated up so quickly that during the whole process r = const. In case of an internal equilibrium state the lamellar thickness cf would be replaced in Equation (11) by the so-called central distance which amounts to cf/2 for a squared lamella [2,13]. If during the whole process an equilibrium is guaranteed with regard to the other variables of the system, the formalism of the equilibrium thermodynamics and accordingly Ehrenfest's pattern, for instance, can be applied.…”

Section: = (T 12)mentioning

confidence: 99%

“…In general, the theory of crystal nucleation starts out from the following presuppositions (see, e. g., [1] or [2]): 1. The crystallizing units are to be at the same time the statistical units of the melt.…”

Section: Introductionmentioning

confidence: 99%

“…The crystallizing units, for instance the chain links [3] or the trans-units [2], are not identical with the statistical units of the melt, viz., with the whole chain molecules. The crystallizing units, for instance the chain links [3] or the trans-units [2], are not identical with the statistical units of the melt, viz., with the whole chain molecules.…”

Section: Introductionmentioning

confidence: 99%

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Stability and growth of nuclei during the crystallization of polymers

Baur

1986

Colloid & Polymer Sci

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During the crystallization of linear flexible chain molecules a boundary phase necessarily develops which has a volume of its own. The boundary phase, however, is not autonomous so that Gibbs' phase rule loses its validity. The 2-phase system {crystal; boundary phase} is bivariant, the 3-phase system {crystal, boundary phase; melt} is monovariant. At quasistatic cooling the ability of the crystal nuclei to grow demands the formation of loose loops or tie-molecules. This leads to the final state of the crystallization to be an arrested equilibrium state. The internal equilibrium state cannot be reached under normal circumstances.

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“…Due to the difficulty that polymeric materials present to be observed by electron microscopy techniques, different methods have been developed that imply chemical treatments and allow to reveal their crystalline structures [1,2,3]. On the other hand, it has been reported that plasma introduces modification on the surface of some polymers, leaving the bulk properties intact.…”

mentioning

confidence: 99%