Miscibility of isotactic poly(1-butene)/isotactic polypropylene blends studied by atomic force Microscopy−Infrared

Cheng, J.; Zhong, Zhenxing; Lin, Yuan; Su, Zhaohui; Zhang, Chunyu; Zhang, Xuequan

doi:10.1016/j.polymer.2021.124445

Cited by 12 publications

(8 citation statements)

References 36 publications

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“…As clearly shown in Figure S11a, the peaks located in 1630, 1320, and 1171 cm –1 in both activated 1 and C 3 H 6 -loaded 1 were assigned to the CN adsorption band, symmetric carbonyl stretching, and C–O stretching vibrations in 1 structure. − While for C 3 H 6 -loaded 1 , some characteristic peaks associated with the propylene molecule were clearly observed. For example, the emerging peaks located at about 2924 and 1436 cm –1 could be attributed to symmetric C–H bending of terminal methyl and methylene motifs in propylene. , Also, the peak at around 996 cm –1 was the C–C stretching mode in propylene . Such spectral changes evidently confirmed the fact that propylene molecules could be adsorbed in the 1 structure.…”

Section: Resultsmentioning

confidence: 72%

“…For example, the emerging peaks located at about 2924 and 1436 cm −1 could be attributed to symmetric C−H bending of terminal methyl and methylene motifs in propylene. 35,36 Also, the peak at around 996 cm −1 was the C− C stretching mode in propylene. 37 Such spectral changes evidently confirmed the fact that propylene molecules could be adsorbed in the 1 structure.…”

Section: Adsorption Conformation and Binding Mechanismmentioning

confidence: 99%

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Quasi-Orthogonal Configuration of Propylene within a Scalable Metal–Organic Framework Enables Its Purification from Quinary Propane Dehydrogenation Byproducts

Líu

et al. 2022

ACS Cent. Sci.

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Propylene production via nonoxidative propane dehydrogenation (PDH) holds great promise in meeting growing global demand for propylene. Effective adsorptive purification of a low concentration of propylene from quinary PDH byproducts comprising methane (CH 4 ), ethylene (C 2 H 4 ), ethane (C 2 H 6 ), propylene (C 3 H 6 ), and propane (C 3 H 8 ) has been an unsolved academic bottleneck. Herein, we now report an ultramicroporous zinc metal−organic framework (Zn-MOF, termed as 1) underlying a rigid one-dimensional channel, enabling trace C 3 H 6 capture and effective separation from quinary PDH byproducts. Adsorption isotherms of 1 suggest a record-high C 3 H 6 uptake of 34.0/92.4 cm 3 cm −3 (0.01/0.1 bar) at 298 K. In situ spectroscopies, crystallographic experiments, and modeling have jointly elucidated that the outstanding propylene uptakes at lower pressure are dominated by multiple binding interactions and swift diffusion behavior, yielding quasi-orthogonal configuration of propylene in adaptive channels. Breakthrough tests demonstrate that 30.8 L of propylene with a serviceable purity of 95.0−99.4% can be accomplished from equimolar C 3 H 6 /C 3 H 8 mixtures for 1 kg of activated 1. Such an excellent property is also validated by the breakthrough tests of quinary mixtures containing CH 4 /C 2 H 4 /C 2 H 6 /C 3 H 6 /C 3 H 8 (3/5/6/ 42/44, v/v/v/v/v). Particularly, structurally stable 1 can be easily synthesized on the kilogram scale using cheap materials (only $167 for per kilogram of 1), which is important in industrial applications.

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Section: Resultsmentioning

confidence: 72%

Section: Adsorption Conformation and Binding Mechanismmentioning

confidence: 99%

Quasi-Orthogonal Configuration of Propylene within a Scalable Metal–Organic Framework Enables Its Purification from Quinary Propane Dehydrogenation Byproducts

Líu

et al. 2022

ACS Cent. Sci.

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“…Recently, employing a nanoIR instrument, they demonstrated that a few iPP chains indeed existed in the PB-1 domains. 56 The content of iPP in PB-rich domains was around 10-20% similar to that of PB-1 in iPPrich domains.…”

Section: Introductionmentioning

confidence: 88%

Promoting form I′ crystallization and melting-recrystallization by adding a β-nucleating agent into poly(butene-1)/isotactic polypropylene blends

Han

et al. 2023

CrystEngComm

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“…Owing to different crystal structures, from II to I phase transformation will make the sample shrink and then increase the density, and this shrinkage will lead to deformation of the sample during use [ 10 ]. Therefore, the as-prepared sample cannot be used immediately; it needs to keep some days until phase transition is completed, which is a challenge for practical production application [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Annealing Process and Molecular Weight on the Polymorphic Transformation from Form II to Form I of Poly(1-butene)

Zhang

Xue

et al. 2023

Polymers

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Poly(1-butene) (PB-1) resin has excellent mechanical properties, outstanding creep resistance, environmental stress crack resistance and other excellent properties. However, PB-1 resin experiences a crystal transformation for a period, which seriously affects the production efficiency and directly restricts its large-scale commercial production and application. The factors affecting the crystal transformation of PB-1 are mainly divided into external and internal factors. External factors include crystallization temperature, thermal history, nucleating agent, pressure, solvent induction, etc., and internal factors include chain length, copolymerization composition, isotacticity, its distribution, etc. In this study, to avoid the interference of molecular weight distribution on crystallization behavior, five PB-1 samples with narrow molecular weight distribution (between 1.09 and 1.44) and different molecular weights (from 23 to 710 k) were chosen to research the influence of temperature and time in the step-by-step annealing process and molecular weight on the crystal transformation by differential scanning calorimetry (DSC). When the total annealing time was the same, the step-by-step annealing process can significantly accelerate the rate of transformation from crystal form II to I. PB-1 samples with different molecular weights have the same dependence on annealing temperature, and the optimal nucleation temperature (i.e., low annealing temperature, Tl) and growth temperature (i.e., high annealing temperature, Th) were −10 °C and 40 °C, respectively. At these two temperatures, the crystal form I obtained by step-by-step annealing had the highest content; other lower or higher annealing temperatures would reduce the rate of crystal transformation. When the annealing temperature was the same, crystal form I first increased with annealing time tl, then gradually reached a plateau, but the time to reach a plateau was different. The crystalline form I contents of the samples with lower molecular weight increased linearly with annealing time th. However, the crystalline form I contents of the samples with higher molecular weight increased rapidly with annealing time th at the beginning, and then transformation speed from form II to form I slowed down, which implied that controlling Tl/tl and Th/th can tune the different contents of form I and form II. At the same Tl/tl or Th/th, with increasing molecular weight, the transformation speed from form II to form I via the step-by-step annealing process firstly increased and then slowed down due to the competition of the number of linked molecules and molecular chain mobility during crystallization. This study definitely provides an effective method for accelerating the transformation of poly(1-butene) crystal form, which not only has important academic significance, but also has vital industrial application.

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Miscibility of isotactic poly(1-butene)/isotactic polypropylene blends studied by atomic force Microscopy−Infrared

Cited by 12 publications

References 36 publications

Quasi-Orthogonal Configuration of Propylene within a Scalable Metal–Organic Framework Enables Its Purification from Quinary Propane Dehydrogenation Byproducts

Quasi-Orthogonal Configuration of Propylene within a Scalable Metal–Organic Framework Enables Its Purification from Quinary Propane Dehydrogenation Byproducts

Promoting form I′ crystallization and melting-recrystallization by adding a β-nucleating agent into poly(butene-1)/isotactic polypropylene blends

Effect of Annealing Process and Molecular Weight on the Polymorphic Transformation from Form II to Form I of Poly(1-butene)

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