Polymorphic Behavior and Crystallization Kinetics of Isotactic Polybutene-1
Summary
Isotactic polybutene-1 exhibits a rich polymorphic landscape characterised by at least two principal crystalline modifications: the metastable tetragonal form II and the thermodynamically stable trigonal form I. Upon melt crystallisation, form II predominates owing to its rapid nucleation and growth kinetics, yet over time or under suitable thermal treatment it undergoes a spontaneous transition to form I. The kinetics of both primary crystallisation and the subsequent form II–I transformation are governed by nucleation density, crystal growth rate and molecular mobility. Internal factors such as molecular weight, tacticity and copolymer content influence chain folding and lamellar thickness, while external variables—including crystallisation temperature, thermal annealing protocol, pressure and the presence of heterogeneous nucleating agents or fillers—modulate the balance between nucleation and growth. Detailed analyses using differential scanning calorimetry, X-ray diffraction and polarised optical microscopy have elucidated Avrami exponents, activation energies and transformation mechanisms. Control of polymorphism in polybutene-1 is crucial for optimising mechanical properties, creep resistance, thermal stability and processing windows for applications ranging from plumbing and packaging to engineered fibres and composites. Advances in tuning crystallisation pathways have enabled accelerated form I generation, reduced ageing times and tailored lamellar architectures, thereby enhancing performance and broadening industrial utilisation of this versatile semicrystalline polymer.
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Polymorphic Behavior and Crystallization Kinetics of Isotactic Polybutene-1 publication trend
The graph below shows the total number of articles in polymorphic behavior and crystallization kinetics of isotactic polybutene-1 across all publications each year (not limited to Nature Index journals).
Technical terms
Polymorphism: the ability of a polymer to crystallise in multiple distinct crystal structures.
Isotacticity: the regular stereochemical arrangement of side groups on the same side of the polymer backbone.
Form II: the metastable tetragonal crystal modification that nucleates rapidly upon cooling.
Form I: the thermodynamically stable trigonal crystal modification obtained by spontaneous or induced transformation.
Crystallization kinetics: the study of rates and mechanisms by which polymer chains organise into crystalline regions.
Nucleation: the initial step in crystallisation where ordered aggregates of polymer chains form a stable crystal nucleus.
Avrami exponent: a parameter describing the time-dependence of crystallisation, reflecting nucleation and growth geometry.
References
- Accelerated crystallization and crystal-crystal transition of PB induced by PP with optimized content. Polymer Testing (2023).
- Effect of Annealing Process and Molecular Weight on the Polymorphic Transformation from Form II to Form I of Poly(1-butene). Polymers (2023).
- Polymorphic Behavior and Phase Transition of Poly(1-Butene) and Its Copolymers. Polymers (2018).
- The II–I Phase Transition Behavior of Butene-1 Copolymers with Hydroxyl Groups. Polymers (2021).
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