Kinetic study of the II–I phase transition of isotactic polybutene-1

Maruyama, Masanori; Sakamoto, Yusuke; Nozaki, Koji; Yamamoto, Takashi; Kajioka, Hiroshi; Toda, Akihiko; Yamada, Koji

doi:10.1016/j.polymer.2010.09.066

Cited by 66 publications

(54 citation statements)

References 41 publications

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“…After phase transition, initial 11 3 helices are elongated by 14% along the chain direction into 3 1 helices and the lateral distance between neighboring helices becomes closer, leading to 10% decrease in the cross section . Such transition process follows the two‐step nucleation and growth mechanism, and the nucleation step dominates transition kinetics . The quiescent nucleation is contributed from the stress caused by the different expansion coefficients between amorphous and crystalline domains .…”

Section: Resultsmentioning

confidence: 99%

“…Form II is kinetically favored and is often generated directly from regular melt crystallization . Form II is metastable from thermodynamic point of view and can spontaneously transform into stable Form I during storage at room temperature . This transformation process takes weeks under quiescent condition, which limits the practical application.…”

Section: Introductionmentioning

confidence: 99%

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Stretching‐induced phase transition of the butene‐1/ethylene random copolymer: Orientation and kinetics

Wang

Shao

Zheng

et al. 2018

J Polym Sci B Polym Phys

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The stretching‐induced phase transition from tetragonal Form II to hexagonal Form I and the evolution of corresponding crystallite orientation were studied for the butene‐1/ethylene random copolymer with 1.5 mol % ethylene by using a combination of tensile test and in situ wide‐angle X‐ray diffraction. Three orientation pathways were distinguished for II‐I phase transition, including phase transition accomplishing within off‐axis oriented crystallites (Orientation Pathway 1), phase transition with simultaneous formation of highly oriented crystallites (Orientation Pathway 2), and phase transition occurring within the highly oriented crystallites already formed (Orientation Pathway 3). The kinetics of II‐I transition was correlated with the macroscopic mechanical response, which exhibits a strong dependence on orientation. In Orientation Pathway 1, the triggering of phase transition corresponds to the mechanical yielding. More interestingly, the kinetics of transition exhibits the identical dependence on stress. However, in Orientation Pathways 2 and 3, appearance of the highly oriented crystallites substantially alters transition kinetics, which is tentatively associated with the stress bearing by interstack tie chains. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 116–126

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stretching‐induced phase transition of the butene‐1/ethylene random copolymer: Orientation and kinetics

Wang

Shao

Zheng

et al. 2018

J Polym Sci B Polym Phys

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“…1 In addition to having four polymorphs (I, I¢, II and III), 2-5 iPB1 shows complex solid-solid transitions. [6][7][8][9][10] As the samples crystallize from a melt in stationary conditions, a metastable tetragonal crystal of 11 3 helices (form II) is kinetically favored. This form II spontaneously transforms into a stable trigonal crystal of 3 1 helices (form I) at ambient temperature via a solid-solid transition.…”

Section: Introductionmentioning

confidence: 99%

“…This form II spontaneously transforms into a stable trigonal crystal of 3 1 helices (form I) at ambient temperature via a solid-solid transition. [6][7][8][9][10] As a result, the bulk mechanical and physical properties are enhanced. These effects are caused neither by an increased crystallinity of the material, because the crystal fraction does not change during the transition, nor by variations of morphology.…”

Section: Introductionmentioning

confidence: 99%

“…These effects are caused neither by an increased crystallinity of the material, because the crystal fraction does not change during the transition, nor by variations of morphology. [11][12][13][14] Despite many structural investigations of the solid-solid transition of iPB1, [6][7][8][9][10][11][12][13][14] the origin of its outstanding mechanical properties is not fully understood.…”

Section: Introductionmentioning

confidence: 99%

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Critical roles of molecular dynamics in the superior mechanical properties of isotactic-poly(1-butene) elucidated by solid-state NMR

Miyoshi

Mamun

2011

Polym J

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Isotactic-poly(1-butene) (iPB1) shows superior mechanical properties after crystal-crystal transitions. Recently, Miyoshi et al. found that crystalline stems in metastable tetragonal crystal perform uniaxial rotational diffusions accompanying side-chain conformational transitions in the fast motional limit (correlation time, /s c S o10 À7 s; Macromolecules 2010, 43, 3986-3989.). In this study, molecular dynamics in stable trigonal crystal is investigated by solid-state nuclear magnetic resonance, which indicates that crystalline stems and side-chain conformations are completely fixed up to melting points (/s c S 410 s). In addition, lamellar thickness, /lS of iPB1 and a low isotacticity iPB1 (low_iPB1) with /mmmmS¼78%, respectively, were investigated by small-angle X-ray scattering. The low_iPB1 sample shows very week supercooling dependence of /lS (B5 nm), whereas iPB1 shows strong supercooling dependence of /lS (10-28 nm). On the basis of molecular dynamics and /lS results, molecular dynamics effects on structures and unique mechanical property of iPB1 are discussed.

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Effect of annealing temperature on phase composition and tensile properties in isotactic poly(1‐butene)

Chvátalová

Beníček

Berková

et al. 2011

J of Applied Polymer Sci

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ABSTRACT:The influence of annealing temperature on the kinetics of polymorphic changes and mechanical properties within the time in isotactic poly(1-butene) (PB-1) has been investigated by wide-angle X-ray scattering and tensile testing. Extruded tapes of PB-1 have been exposed to several annealing temperatures: À22, þ5, þ22, þ40 and þ60 C. The evolution of content of Phase I for various annealing temperatures upon time shows predominantly S-shaped trend. Annealing temperature considerably affects the overall rate of transformation in PB-1. On the other hand, the resulting mechanical properties are solely controlled by the polymorphic composition.

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Kinetic study of the II–I phase transition of isotactic polybutene-1

Cited by 66 publications

References 41 publications

Stretching‐induced phase transition of the butene‐1/ethylene random copolymer: Orientation and kinetics

Stretching‐induced phase transition of the butene‐1/ethylene random copolymer: Orientation and kinetics

Critical roles of molecular dynamics in the superior mechanical properties of isotactic-poly(1-butene) elucidated by solid-state NMR

Effect of annealing temperature on phase composition and tensile properties in isotactic poly(1‐butene)

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