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Morphological implications of the interphase bridging crystalline and amorphousregions in semi-crystalline polymers

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Interphases and Mesophases in Polymer Crystallization I

Part of the book series: Advances in Polymer Science ((POLYMER,volume 180))

Abstract

In semi-crystalline polymers a range of morphologies can be obtained in which a chainmay traverse the amorphous region between the crystals or fold back into the crystals leading to adjacentor nonadjacent reentry, depending on the molecular architecture and crystallization conditions. Thiscauses topological variations on the crystal surface and the occurrence of an interphase between thecrystalline and amorphous domains, thus affecting the mechanical properties. In this chapter, wewill discuss how the morphology within the interphase plays a prominent role in drawability,lamellar thickening and melting of thus crystallized samples. Normally, for linear polymers it isanticipated that extended chain crystals are thermodynamically most favorable, and ultimately, takingthe example of linear polyethylene, it has been shown that such chains would form extended chain crystals.However, this condition will not be realized in a range of polymers upon crystallization fromthe melt, such as those which do not show lamellar thickening or in branched polymers where the sidebranches cannot be incorporated within the crystal and hence fully extended chains are not possible.From a series of experiments, it is shown that with sufficient time and chain mobility, althoughextended chain crystals are not achievable, the chains still disentangle and a thermodynamicallystable morphology is formed with a disentangled crystallizable interphase.

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Abbreviations

2D:

two dimensional

DSC:

differential scanning calorimetry

ESLD:

ethylene sequence length distribution

CRF:

crystalline rigid fraction

F2:

once-folded

FWHM:

full width at half maximum

IR:

infrared

LAM:

Raman longitudinal acoustic modes

LLDPE:

linear low-density polyethylene

MAF:

mobile amorphous fraction

Mw:

molecular weight

NIF:

non-integer fold

nm:

nanometer

NMR:

nuclear magnetic resonance

PET:

poly(ethylene terephthalate)

PEN:

poly(ethylene naphthalate)

PBT:

poly(butylene terephthalate)

Q 0 :

equilibrium triple point

RAF:

rigid amorphous fraction

SAXS:

small-angle X-ray scattering

T c :

crystallization temperature

T g :

glass transition temperature

T m :

melting temperature

UHMW-PE:

ultrahigh molecular weight polyethylene

WAXD:

wide-angle X-ray diffraction

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Author information

Authors and Affiliations

  1. Department of Chemical Engineering/Dutch Polymer Institute, Eindhoven University of Technology, Den Dolech 2, P.O. Box 513, 5600MB, Eindhoven, The Netherlands

    Sanjay Rastogi

  2. Max Planck Institute for Polymer Science, Ackermannweg 10, 55128, Mainz, Germany

    Sanjay Rastogi

  3. Department of Chemical Engineering/Dutch Polymer Institute, Eindhoven University of Technology, Den Dolech 2, P.O. Box 513, 5600MB, Eindhoven, The Netherlands

    Ann E. Terry

Authors
  1. Sanjay Rastogi
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  2. Ann E. Terry
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Corresponding author

Correspondence to Sanjay Rastogi .

Editor information

Editors and Affiliations

  1. Dipartimento di Chimica Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, Via L. Mancinelli, 7, 20131, Milano, Italy

    Giuseppe Allegra

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Rastogi, S., Terry, A.E. (2005 ). Morphological implications of the interphase bridging crystalline and amorphousregions in semi-crystalline polymers. In: Allegra, G. (eds) Interphases and Mesophases in Polymer Crystallization I. Advances in Polymer Science(), vol 180. Springer, Berlin, Heidelberg. https://doi.org/10.1007/b107237

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