Influence of Steric Norbornene Co-units on the Crystallization and Memory Effect of Polybutene-1 Copolymers

Liao, Yilong; Liu, Long; Ma, Zhe; Li, Yuesheng

doi:10.1021/acs.macromol.0c00078

Cited by 31 publications

(39 citation statements)

References 67 publications

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“…The memory effect at the high temperature above the equilibrium melting temperature has been reported in copolymers. [ 19,56 ] Gao et al . [ 44 ] performed the Monte…”

Section: Resultsmentioning

confidence: 99%

Crystallization and Phase Transition of 1‐Butene Copolymers with Distinct Cyclic Co‐Units

Liu

Lou

et al. 2022

Chin. J. Chem.

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Comprehensive Summary The dimethylpyridylamidohafnium catalyst was used to synthesize 1‐butene/cyclohexene and 1‐butene/vinylcyclohexane random copolymers, which have extra six‐membered cyclic co‐units in main chain and side chain, respectively. For the obtained copolymers of different incorporations, the crystallization from amorphous melt and the solid phase transition from tetragonal to trigonal phases were investigated with differential scanning calorimetry. Both of the incorporated cyclic co‐units decrease the crystallization kinetics, but the presence of cyclohexene keeps the melting temperature of copolymers constant. Interestingly, the strong memory effect of crystallization can appear at the elevated temperature even above the equilibrium melting temperature, as the content of co‐units was increased. The 1‐butene/vinylcyclohexane copolymer with 1.52 mol% co‐units exhibits a rather strong memory effect with the broad Domain IIa width of 43°C and the crystallization temperature raising of 24°C. Furthermore, the transition of tetragonal phase into trigonal phase was also explored for different co‐units and incorporations. It was found that both of the cyclohexene co‐units and vinylcyclohexane co‐units effectively slow down the kinetics of phase transition. However, the vinylcyclohexane co‐units have a much higher efficiency in suppressing phase transition than the cyclohexene co‐units, where 0.53 mol% vinylcyclohexane can completely stop phase transition within 1320 h. Considering the fact that copolymers with vinylcyclohexane co‐units actually have lower glass transition temperatures, it was indicated that the suppression of phase transition is also largely influenced by the steric co‐units in the side chain for the helical and positional adjustments, not only by the segmental mobility.

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“…The memory effect at the high temperature above the equilibrium melting temperature has been reported in copolymers. [ 19,56 ] Gao et al . [ 44 ] performed the Monte…”

Section: Resultsmentioning

confidence: 99%

Crystallization and Phase Transition of 1‐Butene Copolymers with Distinct Cyclic Co‐Units

Liu

Lou

et al. 2022

Chin. J. Chem.

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“…Such a phenomenon could be explained by one fact that storage moduli of the composites were increased with increasing DCP content leading to declined deformation capacity and increased shape recovery ability [10,16] and the other that more EUG and PB-1 crystals served as reversible domain were suffered in the composite crosslinked by more DCP resulting in decreased shape fixing capability. [37] Given that two well-separated crystalline and melting phase transitions were present in the crosslinked EUG/PB-1 composites, triple shape memory behavior was expected and analyzed in the present study. Figure 8 presents the shape memory characteristics of EUG/PB-1 composites at high temperature in a triple manner.…”

Section: Multiple Shape Memory Behaviorsmentioning

confidence: 91%

Section: Multiple Shape Memory Behaviorsmentioning

confidence: 99%

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Covalent crosslinks turn natural Eucommia ulmoides gum/polybutene‐1 composites into multiple shape memory materials

et al. 2021

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A series of shape memory natural Eucommia ulmoides gum (EUG)/polybutene‐1 (PB‐1) composites were developed based on polymer blending. It was revealed that covalent crosslinks turned typical “sea‐island” phase morphology in the EUG/PB‐1 blend into a chemical co‐continuous structure, which played a vital role in promoting mechanical performances and fulfilling multiple shape memory effect dominated by the two well‐separated crystalline and melting phase transitions. Although the increase in cross‐linking density was a disadvantage to mechanical performances and shape fixing, the composite with more covalent crosslinks displayed better shape recovery capacity. The EUG/PB‐1 composite crosslinked by 0.4 phr diycumyl peroxide (DCP) displayed the highest shape fixing capacity, while the best shape recovery ability was given by that crosslinked by 1.6 phr DCP. The findings would provide a new technique to develop intelligent materials applied in smart packaging and hot‐shrinkable products.

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“…Polybutene-1 (PB-1) is a linear, high molecular weight polymer prepared by coordination polymerization of 1-butene as a monomer with Ziegler-Natta or metallocene catalysts, with a certain degree of spatial structure regularity and crystallinity. Because of its excellent mechanical performance, environmental stress cracking resistance, high temperature creep resistance, excellent processability and packing rate, non-toxic and odorless, recyclability, etc., [1][2][3][4][5][6][7][8] it has been widely used to fabricate cold or hot resistance water pipes, food packaging, and waterproof materials. This makes PB-1 become one of the essential materials in daily life.…”

Section: Introductionmentioning

confidence: 99%

Properties study of composites for polybutene‐1 and modified graphene oxide

Kou

Duan

Chen

et al. 2022

J of Applied Polymer Sci

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Polybutene-1 (PB-1) was wildly used as pipe and film with its excellent mechanical performance, great creep resistance even at high temperature, good machinability, and fillable performance. This work focused on studying the properties of composites for polybutene-1 and modified graphene oxide (MGO). The graphene oxide (GO) was prepared using an improved Hummers method, and then it was modified with γ-methylacryloxy propyl trimethoxysilane (KH570). After that, the obtained MGO was composited with PB-1 by the solution blending method. The structure and properties of PB-1 composites were investigated by Fourier transform infrared (FTIR), scanning electron microscope (SEM), Xray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimeter (DSC), universal material testing machine. The results showed that the MGO and PB-1 presented good compatibility, and the addition of MGO could not change the crystal morphology of PB-1. When the content of MGO was 0.75 wt% of PB-1, the melt and crystallization temperatures were 127.5 and 70.5 C, and the strength of tensile and bending in the PB-1/MGO composites was 27.58 and 674 MPa. Thus, the PB-1/MGO composites have great potential for practical applications, such as in agricultural films and tubes.

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Influence of Steric Norbornene Co-units on the Crystallization and Memory Effect of Polybutene-1 Copolymers

Cited by 31 publications

References 67 publications

Crystallization and Phase Transition of 1‐Butene Copolymers with Distinct Cyclic Co‐Units

Crystallization and Phase Transition of 1‐Butene Copolymers with Distinct Cyclic Co‐Units

Covalent crosslinks turn natural Eucommia ulmoides gum/polybutene‐1 composites into multiple shape memory materials

Properties study of composites for polybutene‐1 and modified graphene oxide

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