Epitaxial crystallization and crystalline polymorphism of poly(1-butene): form I

Kopp, S.; Wittmann, J. C.; Lotz, Bernard

doi:10.1016/0032-3861(94)90933-4

Cited by 114 publications

(78 citation statements)

References 7 publications

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“…[79][80][81] Epitaxy of semicrystalline polymers can be achieved on a large variety of substrates including, inorganic substrates such as NaCl or KCl, 82,83 aromatic molecular crystals, [79][80][81] polymeric alignment layers, 78 and infusible aromatic salts. 84 These substrates tend usually to direct the chain orientation along certain crystallographic directions of the substrate and act also as nucleating surfaces. For instance, para-terphenyl and anthracene lead to textured and oriented polymer films of polyethylene (PE) when the growth is performed on the surface of uniform single crystals of these aromatic molecules.…”

Section: Heterogeneous Nucleation Of P3htmentioning

confidence: 99%

Structure and morphology control in thin films of regioregular poly(3‐hexylthiophene)

Brinkmann

2011

J Polym Sci B Polym Phys

368

388

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This review focuses on the structural control in thin films of regioregular poly(3-hexylthiophene) (P3HT), a workhorse among conjugated semiconducting polymers. It highlights the correlation existing between processing conditions and the resulting structures formed in thin films and in solution. Particular emphasis is put on the control of nucleation, crystallinity and orientation. P3HT can generate a large palette of morphologies in thin films including crystalline nanofibrils, spherulites, interconnected semicrystalline morphologies and nanostructured fibers, depending on the elaboration method and on the macromolecular parameters of the polymer. Effective means developed in the recent literature to control orientation of crystalline domains in thin films, especially by using epitaxial crystallization and controlled nucleation conditions are emphasized.

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Section: Heterogeneous Nucleation Of P3htmentioning

confidence: 99%

Structure and morphology control in thin films of regioregular poly(3‐hexylthiophene)

Brinkmann

2011

J Polym Sci B Polym Phys

368

388

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“…The trigonal form is usually obtained from the solid-solid spontaneous transformation from the tetragonal form (Natta et al, 1960) and in solutions (Holland & Miller, 1964). The trigonal form was recently shown to crystallize directly from the melt under atmospheric pressure with the aid of epitaxy (Kopp et al, 1994) or in ultrathin films at an elevated temperature (Zhang et al, 2002). In these works, however, in situ observations of the trigonal crystal growth could not be performed.…”

Section: Introductionmentioning

confidence: 90%

Surface free energies of isotactic polybutene-1 tetragonal and trigonal crystals: the role of conformational entropy of side chains

Yamashita

Kato

2007

J Appl Cryst

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Lateral and end surface free energies of melt-crystallized isotactic polybutene-1 (it-PB1) trigonal and tetragonal crystals have been determined by small-angle X-ray scattering and in situ observation of the crystal growth kinetics. The lateral surface free energy of the trigonal phase is about seven times as large as the value Hoff calculated according to Hoffman's equation [Hoffman (1992). Polymer, 33, 2643-2644], while that of the tetragonal phase is roughly in agreement with the estimation. The discrepancy between the values of and Hoff for the trigonal phase can be attributed to the loss of conformational entropy of the ethyl side chains of it-PB1.

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“…The formation of the different polymorphs is controlled by the selected thermodynamic pathway of crystallization or specific condition of preparation/ processing, respectively. [5][6][7][8][9] Crystallization from solution allows formation of modifications I 0 , II, and III, being controlled by dissolution and crystallization temperatures. 10 Melt-crystallization, at ambient pressure, triggers formation of form II crystals.…”

Section: Introductionmentioning

confidence: 99%

Effect of polymorphism of isotactic polybutene‐1 on peel behavior of polyethylene/polybutene‐1 peel systems

Nase

Androsch

Langer³

et al. 2007

J of Applied Polymer Sci

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The effect of polymorphism of isotactic polybutene-1 (iPB-1) on the peel behavior of the specific peel system low-density polyethylene/polybutene-1 (LDPE/iPB-1) was investigated using wide-angle X-ray scattering, calorimetry, and the T-peel test. Melt-crystallization of iPB-1, initially, yields tetragonal form II crystals which transform as a function of time to trigonal form I crystals. The kinetics of transformation at ambient temperature follows an exponential function, and is completed after about 50-75 h. The presence of LDPE in the peel system does not affect the transformation kinetics. The structure of the crystalline phase of iPB-1 controls the peel force which decreases by about 25% during the crystal-crystal transformation in a blend with 20 m% iPB-1. The reduction of the peel force depends linearly on the mass fraction of iPB-1 crystals in the peel system which further evidences the correlation between the crystalcrystal transformation of iPB-1 and the peel-characteristics of LDPE/iPB-1 blends. Isothermal reorganization of crystals of LDPE is excluded as reason for the change of the peel-performance of LDPE/iPB-1 blends, since it is 5 to 10 times faster than the decrease of the peel force, and crystal-crystal transformation of iPB-1, respectively.

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Epitaxial crystallization and crystalline polymorphism of poly(1-butene): form I

Cited by 114 publications

References 7 publications

Structure and morphology control in thin films of regioregular poly(3‐hexylthiophene)

Structure and morphology control in thin films of regioregular poly(3‐hexylthiophene)

Surface free energies of isotactic polybutene-1 tetragonal and trigonal crystals: the role of conformational entropy of side chains

Effect of polymorphism of isotactic polybutene‐1 on peel behavior of polyethylene/polybutene‐1 peel systems

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