Stretch-Induced Crystal–Crystal Transition of Polybutene-1: An in Situ Synchrotron Radiation Wide-Angle X-ray Scattering Study

Liu, Yanping; Cui, Kunpeng; Tian, Nan; Zhou, Weiqing; Meng, Lingpu; Li, Liangbin; Ma, Zhe; Wang, Xiaolin

doi:10.1021/ma2026513

Cited by 142 publications

(134 citation statements)

References 68 publications

Supporting

Mentioning

126

Contrasting

Order By: Relevance

“…21,22 In particular Liu et al interpreted the strain hardening as originated by the formation of a new mechanical network with form I crystals acting as physical cross-links, a process called gelation. 22 It should be noted that, contrary to the present study, a single strain rate was explored in their work. On the basis of the measured deformation kinetics of form II and of the mechanical properties of form I, we might give an alternative explanation.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Kinetics of the Polymorphic Transition in Isotactic Poly(1-butene) under Uniaxial Extension. New Insights From Designed Mechanical histories.

et al. 2014

View full text Add to dashboard Cite

Isotactic poly(1-butene) (i-PBu) crystallizes upon cooling from the melt in a metastable tetragonal structure (form II), which slowly evolves toward the state of ultimate stability, i.e., the trigonal form I. It is well-known that this polymorphic transformation, which typically requires few weeks at room temperature, can be greatly accelerated by the application of mechanical stresses and/or deformation. However, the exact mechanism of this kinetics enhancement is not completely understood. In this work, the polymorphic transformation of i-PBu under tensile deformation is investigated in details. Thanks to properly designed mechanical histories−including experiments at different true strain and true stress rates−and to in situ wide-angle X-ray diffraction experiments, the role of the various deformation parameters is elucidated. The use of different time scales during the experiments enabled us to gain kinetics data on the transition, information which is disregarded in current literature. The set of experiments performed permit to highlight a stress-driven mechanism, active up to a fraction of transformed form I of about 0.4−0.5. After this value is reached, the stress-transformation time superposition principle does not hold anymore and the transition kinetics slows down, since a major part of the total applied stress is carried by the mechanically stronger form I lamellae.

show abstract

Section: Methodsmentioning

confidence: 99%

“…The strain hardening corresponds to the last stage and is due to an increased connectivity caused by the newly formed crystals. 22 The polymorphic transformation was described as strain-dependent in these latter works. 20−22 Despite this extensive investigation some open questions still remains.…”

Section: ■ Introductionmentioning

confidence: 99%

Kinetics of the Polymorphic Transition in Isotactic Poly(1-butene) under Uniaxial Extension. New Insights From Designed Mechanical histories.

et al. 2014

View full text Add to dashboard Cite

show abstract

“…This transformation process takes weeks under quiescent condition, which limits the practical application. However, stretching can significantly accelerate the transition process, which is attracting increasing attention from both academia and industry.…”

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

Self Cite

View full text Add to dashboard Cite

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

show abstract

“…A semicrystalline polymer is normally schematically presented as crystalline lamellae embedded in amorphous phase and its mechanical behavior is closely linked to the deformation processes of each constituent and their interactions . In situ measurements combining structure and property become essential for understanding structure and mechanical property relationship of the materials . Small‐ and wide‐angle X‐ray scattering (SAXS and WAXS) techniques can be carried out in situ during the deformation on samples with morphologies similar to bulk material .…”

Section: Introductionmentioning

confidence: 99%

Stretch‐induced stable‐metastable crystal transformation of PVDF/graphene composites

Guo

Meng

et al. 2019

Polymer Crystallization

View full text Add to dashboard Cite

Deformation‐induced crystalline structure transformation of poly(vinylidene fluoride) (PVDF)/graphene composites from stable α‐crystal to metastable β‐crystal at different temperatures was investigated by means of in situ synchrotron radiation wide‐angle and small‐angle X‐ray scattering (SAXS). The obtained results of lamellar and crystalline structures during tensile deformation shown that the α‐β crystal transformation relies on the evolution of orientation and there is a threshold value (∼0.5) of orientation function for structure transformation. The mechanism of α‐β crystal transformation was interpreted based on an indirect approach via the intermediate state of tensile deformation‐induced fragmentation and recrystallization process. The fragmentation and recrystallization process was verified by the analysis of four‐point and then six‐point SAXS patterns. The formation of β‐phase at 160°C was confirmed as a “recrystallization (α‐crystal ‐) β‐phase transformation.” The loaded appropriate stress guarantees the stable‐metastable phase transformation of PVDF. While at 30°C, the adequate stress concentrated on the crystal phase results in formation of β‐crystal from the initial recrystallization. The addition of graphene is beneficial to enhance the mechanical property of PVDF at both 30°C and 60°C, but the compatibility of PVDF/graphene composites does not favor high temperature such as deformation at 160°C.

show abstract

Stretch-Induced Crystal–Crystal Transition of Polybutene-1: An in Situ Synchrotron Radiation Wide-Angle X-ray Scattering Study

Cited by 142 publications

References 68 publications

Kinetics of the Polymorphic Transition in Isotactic Poly(1-butene) under Uniaxial Extension. New Insights From Designed Mechanical histories.

Kinetics of the Polymorphic Transition in Isotactic Poly(1-butene) under Uniaxial Extension. New Insights From Designed Mechanical histories.

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

Stretch‐induced stable‐metastable crystal transformation of PVDF/graphene composites

Contact Info

Product

Resources

About