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Nano- and Micromechanics of Crystalline Polymers

Chapitre d'ouvrage scientifique
Auteur
GALESKI, Andrzej
546894 Department of Bioorganic Chemistry Centre of Molecular and Macromolecular Studies Polish Academy of Sciences
ccREGNIER, Gilles
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/18698
Date
2009

Résumé

It is currently thought that crystalline polymers consists of lamellar crystals which are separated from each other by a layer of amorphous polymer and are held together by tie molecules through the amorphous phase [e.g. 1]. The lamellae are formed from mostly folded chains. The thickness of lamellae is determined by the parameters such as interfacial energies, glass transition temperature and melting temperature, undercooling, segmental diffusivity, etc. The thickness reported lies usually in a narrow range between 3 and 20 nm as obtained from observations in various types of microscopes or calculated from the degree of crystallinity and long period. It has been recognized that chain folding is not so regular as it was thought and molecular packing in lamellae is subject to considerable and irregularly distributed disorder depending on undercooling- regimes of crystallization. It has been demonstrated in various ways that the planar growth front will always break up into fibrous or cellular growth. Also crystallization of polymers leads to interface instability. More sophisticated treatment of the instabilities involve perturbation analyses of planar interfaces, correlating diffusion, temperature gradients along the interface, and interfacial energy with the size of the growing crystals.

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Documents liés

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  • Crystallization kinetics of polymer fibrous nanocomposites 
    Article dans une revue avec comité de lecture
    GALESKI, Stanislaw; PIÓRKOWSKA, Ewa; ROZANSKI, Artur; GALESKI, Andrzej; JURCZUK, Kinga; ccREGNIER, Gilles (Elsevier, 2016)
    Through applying both a probabilistic approach and a combination of probabilistic and the Avrami ‘extended volume’ approaches we have derived a theory of overall crystallization kinetics of polymers reinforced with nanofibers. ...
  • Limitations of simple flow models for the simulation of nanoimprint 
    Article dans une revue avec comité de lecture
    TEYSSEDRE, Hubert; GILORMINI, Pierre; ccREGNIER, Gilles (2013)
    A quick evaluation of the forces involved in nanoimprint would be very helpful in the prevention of mold deflection. Unfortunately, it is shown here that assuming simplified flows may lead to quite incorrect evaluations ...
  • Shear-strain step response in linear regime of dilute suspensions of naturally bent carbon nanotubes 
    Article dans une revue avec comité de lecture
    CRUZ, Camilo; ILLOUL, Lounès; ccREGNIER, Gilles; ccCHINESTA SORIA, Francisco (Wiley, 2012)
    Impressive enhancements of the storage modulus have been documented when low volume fractions of single wall carbon nanotubes (SWNTs) are added to a Newtonian solvent for obtaining dilute suspensions. The intrinsic bending ...
  • Structure and molecular dynamics of multilayered polycarbonate/polystyrene films. 
    Article dans une revue avec comité de lecture
    WALCZAK, M; CIESIELSKI, W; GALESKI, A; POTRZEBOWSKI, M.J.; HILTNER, A; BAER, Eric; ccREGNIER, Gilles (Wiley, 2012)
    Multilayered film polycarbonate/polystyrene (PC/PS) comprising 257 layers with total thickness 125 m was made by coextrusion process. The nominal thickness of PC layers was 680 nm, and the nominal thickness of PS layers ...
  • Experimental and numerical analysis of the selective laser sintering (SLS) of PA12 and PEKK semi-crystalline polymers 
    Article dans une revue avec comité de lecture
    ROUCHAUSSE, Yann; PEYRE, Patrice; DEFAUCHY, Denis; ccREGNIER, Gilles (Elsevier, 2015)
    A dual experimental-numerical approach was carried out to estimate thermal cycles and resulting fusion depths obtained during the selective laser sintering (SLS) of two polymers: PA12 and PEKK. The validation of thermal ...

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