Effect of Linear and Ring-like Co-units on the Temperature Dependence of Nucleation and Growth in II-I Phase Transition of Butene-1 Copolymers

Lou, Yahui; Liao, Yilong; Pan, Li; Wang, Bin; Li, Yuesheng; Ma, Zhe

doi:10.1007/s10118-018-2135-6

Cited by 24 publications

(20 citation statements)

References 26 publications

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“…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%

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: 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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“…He et al . observed that the linear ethylene and ring‐like methylene‐1,3‐cyclopentane structural counits with concentrations of 4.3 and 2.15 mol %, respectively, in the 1‐butene copolymers prevented the crystallization of Form II at a standard crystallization cooling rate of 10 °C min −1 …”

Section: Resultsmentioning

confidence: 99%

Rheology, polymorphic crystal transformation, thermal, and mechanical properties of long‐chain branched isotactic poly(1‐butene)

Maimaitiming

Wang

Tan

et al. 2019

J of Applied Polymer Sci

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Effects of long-chain branches (LCBs) on the rheology, crystal polymorphism, polymorphic transformation, and corresponding thermal and mechanical properties at different crystallization conditions, of isotactic poly(1-butene) (iPB-1) are systematically studied. The complex viscosity decreases and tangent increases with the increase of LCB concentration, and they inversely correlate with gels. The low branched samples crystallize into pure Form II by compression molding and cooling the melt to room temperature at a low crystallization cooling rate, whereas the moderate-to-highly branched samples crystallize into mixtures of Forms II and III, with a 1-30% fraction of crystals of Form III. The transformation of Form II into Form I in low branched iPB-1 was not significantly decelerated at different crystallization cooling rates, which is important in thermoforming, foaming, and extrusion blowing processes. Upon heating, Form III in highly branched iPB-1 with gels does not cold-crystallize into Form II even at a low heating rate. The low-to-highly branched samples mainly in Form I exhibit high yield strength, high melting temperature, and lower ductility, while the highly branched iPB-1 containing gels and mixtures of Forms I, III, and I 0 possess brittleness. Under stretching, Form III predominantly transforms into Form I via a solid-solid crystal transition.

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“…When the 4M1P incorporation exceeds 3.4 mol%, 4M1P branches are high enough to completely impede the II-I phase transition, even when the aging time is as long as four months [35]. The phase transition can also be accelerated by physical and chemical approaches, such as high pressure [36], pressurized CO 2 [37][38][39], external or thermal stress [40][41][42][43], and even co-units [29,31,[44][45][46]. Qiao et al found that the PB-1 samples were isothermally crystallized into metastable form II crystalline modification followed by annealing at a lower temperature and subsequently at a higher temperature to promote the polymorphic transition from form II to form I.…”

Section: Introductionmentioning

confidence: 99%

The II–I Phase Transition Behavior of Butene-1 Copolymers with Hydroxyl Groups

et al. 2021

Polymers

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The crystallization and II–I phase transition of functionalized polybutene-1 with hydroxyl groups were investigated by differential scanning calorimetry. The results show that the incorporated hydroxyl groups increase the nucleation density but decrease the growth rate in melt crystallization. Interestingly, for the generated tetragonal form II, the presence of polar hydroxyl groups can effectively accelerate the phase transition into the thermodynamically stable modification of trigonal form I, especially with stepwise annealing and high incorporation. Using stepwise annealing, II–I phase transition was enhanced by an additional nucleation step performed at a relatively low temperature, and the optimal nucleation temperature to obtain the maximum transition degree was ‒10 °C, which is independent from the content of hydroxyl groups. Furthermore, the accelerating effect of hydroxyl groups on the II–I transition kinetics can be increased by reducing the crystallization temperature when preparing form II crystallites. These results provide a potential molecular design approach for developing polybutene-1 materials.

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Effect of Linear and Ring-like Co-units on the Temperature Dependence of Nucleation and Growth in II-I Phase Transition of Butene-1 Copolymers

Cited by 24 publications

References 26 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

Rheology, polymorphic crystal transformation, thermal, and mechanical properties of long‐chain branched isotactic poly(1‐butene)

The II–I Phase Transition Behavior of Butene-1 Copolymers with Hydroxyl Groups

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